inches	mm.	inches	mm.	inches	mm.	inches	mm.	inches	mm.
-	-	1	25,4	2	50,8	3	76,2	4	101,6
1/8	3,2	1 1/8	28,6	2 1/8	54,0	3 1/8	79,4	4 1/8	104,8
1/4	6,4	1 1/4	31,8	2 1/4	57,2	3 1/4	82,6	4 1/4	108,8
3/8	9,5	1 3/8	34,9	2 3/8	60,3	3 3/8	85,7	4 3/8	111,1
1/2	12,7	1 1/2	38,1	2 1/2	63,5	3 1/2	88,9	4 1/2	114,3
5/8	15,9	1 5/8	41,3	2 5/8	66,7	3 5/8	92,1	4 5/8	117,5
3/4	19,0	1 3/4	44,4	2 3/4	69,8	3 3/4	95,2	4 3/4	120,6
7/8	22,2	1 7/8	47,6	2 7/8	73,0	3 7/8	98,4	4 7/8	123,8

Parameters of inch threads

The outer diameter of the pipe connected		SAE thread rating	Nominal Threads UNF.	Outer thread diameter, mm	The average diameter of the thread, mm	Pitch thread
mM.	inch					mM.	thread / inch
6	1/4""""	1/4""""	7/16""""-20	11,079	9,738	1,27	20
8	5/16""""	5/16""""	5/8""""-18	15,839	14,348	1,411	18
10	3/8""""	3/8""""	5/8""""-18	15,839	14,348	1,411	18
12	1/2""""	1/2""""	3/4""""-16	19,012	17,33	1,588	16
16	5/8""""	5/8""""	7/8""""-14	22,184	20,262	1,814	14
18	3/4""""	3/4""""	1""""-14	25,357	23,437	1,814	14
18	3/4""""	---	1""""1/16-14	26,947	25,024	1,814	14
20	7/8""""	---	1""""1/8-12	28,529	26,284	2,117	12
22	7/8""""	7/8""""	1""""1/4-12	31,704	29,459	2,117	12
22	7/8""""	---	1""""3/8-12	34,877	32,634	2,117	12
25	1""""	1""""	1""""1/2-12	38,052	35,809	2,117	12

Copper veins, wires and cables

Section of conductive veins, mm	Copper veins, wires and cables
	Voltage, 220 V		Voltage, 380 V
	Talk, A.	power, kWt	Talk, A.	power, kWt
1,5	19	4,1	16	10,5
2,5	27	5,9	25	16,5
4	38	8,3	30	19,8
6	46	10,1	40	26,4
10	70	15,4	50	33,0
16	85	18,7	75	49,5
25	115	25,3	90	59,4
35	135	29,7	115	75,9
50	175	38,5	145	95,7
70	215	47,3	180	118,8
95	260	57,2	220	145,2
120	300	66,0	260	171,6

Aluminum veins, wires and cables

The cross section of the current veins, mm	Aluminum veins, wires and cables
	Voltage, 220 V		Voltage, 380 V
	Talk, A.	power, kWt	Talk, A.	power, kWt
2,5	20	4,4	19	12,5
4	28	6,1	29	15,1
6	36	7,9	30	19,8
10	50	11,0	39	25,7
16	60	13,2	55	36,3
25	85	18,7	70	46,2
35	100	22,0	85	56,1
50	135	29,7	110	72,6
70	165	36,3	140	92,4
95	200	44,0	170	112,2
120	230	50,6	200	132,0

Dimensions of inch thread

	Thread diameter in mm			Thread step in mm	Number of threads per 1 "
	Outdoor D.	Middle D.	Inner D.
3/16	4,762	4,085	3,408	1,058	24
1/4	6,350	5,537	4,724	1,270	20
5/16	7,938	7,034	6,131	1,411	18
3/8	9,525	8,509	7,492	1,588	16
1/2	12,700	11,345	9,989	2,117	12
5,8	15,875	14,397	12,918	2,309	11
3/4	19,05	17,424	15,798	2,540	10
7/8	22,225	20,418	18,611	2,822	9
1	25,400	23,367	21,334	3,175	8
1 1/8	28,575	26,252	23,929	3,629	7
1 1/4	31,750	29,427	27,104	3,629	7
1 1/2	38,100	35,39	32,679	4,233	6
1 3/4	44,450	41,198	37,945	5,080	5
2	50,800	47,186	43,572	5,644	4 1/2

Nominal thread diameter in inches
	Thread diameter in mm			Thread step in mm	Number of threads per 1 "
	Outdoor D.	Middle D.	Inner D.
1/8	9,729	9,148	8,567	0,907	28
1/4	13,158	12,302	11,446	1,337	19
3/8	16,663	15,807	14,951	1,337	19
1/2	20,956	19,794	18,632	1,814	14
5/8	22,912	21,750	20,588	1,814	14
3/4	26,442	25,281	24,119	1,814	14
7/8	30,202	29,040	27,878	1,814	14
1	33,250	31,771	30.293	2,309	11
1 1/8	37,898	36,420	34,941	2,309	11
1 1/4	41,912	40,433	38,954	2,309	11
1 3/8	44,325	32,846	41,367	2,309	11
1 1/2	47,805	46,326	44,847	2,309	11
1 3/4	53,748	52,270	50,791	2,309	11
2	59,616	58,137	56,659	2,309	11

Table of translation units

Translation of energy units	Translation of pressure units
1 J \u003d 0.24 Cal	1 Pa \u003d 1 n / m * m
1 kJ \u003d 0.28 W * h	1 Pa \u003d 0.102 kgf / m * m
1 W \u003d 1 J / s	1 atm \u003d 0,101 MPa \u003d 1.013 bar
1 Cal \u003d 4.2 J	1 bar \u003d 100 kPa \u003d 0,987 atm
1 kcal / h \u003d 1,163 W	1 psi \u003d 0,06895 bar \u003d 0,06805 atm

Translation table of inch sizes in metric. Thread Size: Table of metric and inch threads

The process of selecting the necessary sizes of the threaded section, cables and pipes often causes a variety of time. In addition to choosing suitable dimensions, taking into account the equipment parameters, the customer has to independently translate data into suitable units of measurement. Such a process is turning to be significant temporary costs.

We simplify this task, as we suggest you to use the ready-made translation tables. On the page of our site you will find tables that will help you easily choose the necessary threads of inch pipes, copper and aluminum wires and cables. Also, you can use the table of translation in the metric, thereby accurately calculate the necessary section sizes.

Unfortunately, most equipment manufacturers leave the customer one to one with the execution of calculations. Therefore, a person has to independently search for a translation table on the Internet to select the optimal size of the cross-section of the wires and diameters of pipes.

We value the time of our customers, providing everyone to the use of ready-made solutions. In our tables, standard dimensions of inches per millimeters are translated.

On this page, you will also find the translations of the main energy units and pressure units, therefore, be able to correctly select refrigeration equipment, given the individual conditions of placement and operating modes of aggregates.

15512 2 3

How to determine the size of the pipe in inches: 15 curious facts

In this article I am going to talk about how the sizes of pipes in inches and millimeters relate. In addition, we with the reader will have a little excursion to the history of length measures and in the current regulatory documentation. So, on the road.

History in

1. The origin of the word "inches" is derived from Dutch DUIM, which literally means "thumb". However, as an international designation of this measure, another word is used - inch;
2. Like all old lengths of length, inch takes the beginning in human anthropometry and is equal to the length of the extreme phalanx in the thumb. In addition, it is equal to 1/12 feet (from the English foot - foot foot) and 1/36 yard (according to legends, the yard was equal to the distance from the nose to the end of the thumb out of the hands of the King of Britain Heinrich first);

There is an opinion that the Sword of Heinrich had a length of one yard.

1. In different countries and at different times, the inch took different meanings. Viennese inches (Austro-Hungary) is 2.63 cm, French - 2,707, Starolar - 2.48, Novopolsky - 2.4, Prussian sample of 1816 - and at all 3.766 cm;
2. In Russia, this measure of length was introduced by Peter first. Prior to that, in trade and during the calculations, domestic units of measurement were used, also based on anthropometry - tops (the length of the first phalange of the index finger), the span (it is measured between the largest and index fingers diluted at the maximum distance (the length of the adult step);
3. Currently, the most common is English inch. Since 1958, it agreed to consider it equal to 2.54 cm.

About Bardaka

Dear reader, do you think that it is possible to calculate the cross section of the steel pipe or the cigrier in inches, using the caliper and dividing the resulting result by 25.4? Not there was something.

Conditional pass

1. Steel water-gas pipes, whose cross section is taken in inches, are marked at all with a diameter, but by conditional passage. It is close to the inner section, but not necessarily equal to him. It only means that on the nozzle, you can cut the corresponding pipe thread;

1. The actual inner diameter is determined by the conditional passage (more precisely, corresponding to it by the outer diameter) and the type of pipe (it may be ordinary, light or reinforced);
2. The actual internal cross section of products with the same Du (conditional passage) may vary by 0.3 cm due to the walls;
3. The area of \u200b\u200bthe internal section and, accordingly, the throughput capacity of a light and enhanced pipe with a nominal size of half theft differ by 20%. At the same time, the capacity of the light product, but in reinforced due to the greater the thickness of the walls and, accordingly, the greater mass of the route is higher than the price.

Pipe rolling samples produced according to GOST 3262 - 75.

Standards

With all my immeasurable respect for the Soviet standardization system, otherwise, as a mess, how according to current standards, the sizes of pipes in inches and centimeters are correlated:

1. Specified in the documentation section in inches cannot be obtained by a simple recalculation of mm or other units C. The coefficient of recalculation for each diameter and in no case does not correspond to a completely logical value of 25.4;
2. To determine the number of inches on the measurement results, you will have to climb into reference or regulatory documentation. but none in the GOST does not appear the table sizes in inches and millimeters. Actual dimensions with a certain DU and the type of product can be found in GOST 3262-75, which regulates the production of steel black and galvanized water-gas pipes. Meanwhile, the parameters of the corresponding threads are indicated in the other GOST - for the number 6357-81.

The second standard indicates the dimensions of the ridges and the threads in units of C, but denotes the cylindrical tube thread in inches.

Easier, even easier

So, to relate the size of the pipe in inches and mm, you need to be laid out with regulatory documents and painstakingly compare them. So?

Dear reader, I will not tomatize you and simply post a pair of tables, which are compilation of the standards mentioned above.

1. Here is the correspondence of the Du and cherished British inches:

D.	Inches
15	1/2
20	3/4
25	1
32	1 1/4
40	1 1/2
50	2
65	2 1/2
80	3
90	3 1/2
100	4
125	5
150	6

In addition to these, GOST 3262-75 provides conditional passages 6, 8 and 10. However, they do not apply in the plumbing, and do not find threaded fittings.

The minimum cross section used in the plumbing is DU 15.

1. But the ratio of Du and actual dimensions:

D.	External diameter	Wall thickness
		Stregnated	Ordinary	Easy
15	21,3	3,2	2,8	2,5
20	26,8	3,2	2,8	2,5
25	33,5	4	3,2	2,8
32	42,3	4	3,2	2,8
40	48	4	3,5	3
50	60	4,5	3,5	3
65	75,5	4,5	4	3,2
80	88,5	4,5	4	3,5
90	101,3	4,5	4	3,5
100	114	5,0	4,5	4
125	140	5,5	4,5	4
150	165	5,5	4,5	4

How, using these tables, you can calculate the actual dimensions of the pipe 1 inch? Very simple:

In our case, one inch corresponds to the conditional passage of DU 25 and means the outer diameter of 33.5 mm. The inner diameter of the lung tube will be equal to 28.1 mm, ordinary - 27.1, and reinforced - 25.5 mm.

Polymer and metal-polymer pipes

1. They are always marked by an outer diameter of millimeters; The wall thickness is indicated either in marking, or in technical documentation. To get the same as the steel eyeliner of a known size, bandwidth, you need to choose a product with the same inner diameter. Let me remind you, it is calculated as a difference between the diameter and the double wall thickness;

On its shape, the pipe can be not only round, but also oval, rectangular, square section. Despite such a variety of section shape, all pipes have mostly two types of parameters: technical and geometric. The geometric dimensions of the pipes are represented by characteristics such as the outer diameter, the wall thickness, or the ratio of external and internal diameters, and the length. , that is, the size of the pipes are normalized by state standards (gostami). Different Gostes are developed for pipes not only with different methods of manufacturing, but also for different materials used in the production of pipes. In the Russian market, it is mainly possible to specify the sizes of pipes in mm (millimeters), but you can also meet the size of the pipes in inches. The latter are most often indicated for imported pipes. The length of the pipe rental is standardly measured in meters.

The most common and popular are the following pipe sizes (diameter from more to less): 1420, 1220, 1020, 920, 820, 720, 530, 426, 377, 325, 273, 219, 159. This rental refers to the pipes of large and medium diameter. Smaller diameters are in demand significantly less on the market, so they can, of course, can be found, but will have to try. The manufacturer's website will definitely be a table sizes table that manufactures this enterprise. Usually any plant manufacturer tries to cover as a larger range of pipe sizes, since in our time the demand market for this type of rental is very wide.

Russian production until recently has not produced seamless pipes with a diameter of more than 426 mm. But electrospass covers almost the entire sorting. Spiral pipes can have a diameter greater than 1420, but less than 159 - not produced. With straightforgile trumpet, things are different. According to GOST, the smallest diameter of the straight live pipe is 8 mm, and the greatest - 1420 mm. This is due to the fact that the spiral and dirty pipes have a different way of manufacture, although those and others relate to welded pipes.

Dimensions of pipes are not limited to one diameter. The wall thickness is also one of the important technical indicators. Moreover, the diameter directly affects such a size of pipes as the wall thickness. The larger diameter allows you to make pipes with a wider range of wall thicknesses. For example, if the dimensions of metal pipes are straightforward (or rather, their diameter) make up 530 cm, then the wall thickness can vary from 5 to 24 mm. The outer transverse dimensions of steel straight pipes in 1020 mm make it possible to produce them with a wall thickness from 8 mm to 32 mm. The most popular are for a pipe, for example, a diameter of 530 mm, such wall thicknesses, like 7, 8, 9 and 10 mm. For a pipe with a diameter of 1020 mm, the most running thickness - 10, 11, 12, as well as 14 mm.

Interestingly, the size of the pipes of the GOST manufacturers allows you to violate in certain boundaries. In particular, for a straight machine pipe, the diameter of which is 1020 mm, the deviation of the wall thickness can reach almost 1 mm. More precisely - 0.8 mm, and both towards the greater and in the direction of a smaller thickness. And since the sorting of pipes is determined in a pitch of 1 mm in thickness, this value is quite weighty. For example, buying a pipe with a thickness of 11 mm, do not be surprised that with a direct dimension it will turn out to be a pipe with a wall of 10 or 12 mm. This aspect is very important when purchasing pipes, since the weight of the wall depends on this size of the pipes, as the wall thickness depends. More weight - more price. Why is it taken to indicate weight, not a member? Because the cost of the pipe mainly depends on the raw material (the so-called pricing raw material component).

Of course, weigh the pipe - the thing is too troublesome. Therefore, when calculating the price, the theoretical weight is taken into account, which is calculated by the formula: weight 1 of the routine meter \u003d 0,02466 * wall thickness * (the diameter-thickness of the wall). The wall thickness is taken in millimeters. In practice, the calculation is made as follows: the buyer micrometer measures the thickness of the pipes in order to check the deviation from acceptable values. When the tape measure is loaded, the longitudinal sizes of pipes are measured (ie, length) and then, calculating the theoretical weight of 1 perm. Multiply it on the total length of the pipes.

In relation to the size of the pipes steel, as well as to the size of pipes from any other material, the requirements of guests are rather loyal. For example: "Pipes with a diameter of St. 152 mm are made by a length of at least 5 m." Therefore, despite the fact that the used pipes before sales are cut a little, distinguish them in length from new - it is impossible. It is worth remembering that many of the sale of directly or spironels do not indicate the length. This means that the length of the pipes corresponds to the GOST (usually about 11 meters). If in the price list (ad) it is indicated that the pipes are sold chopped along the seams, then their lengths are also within the limits allowed by gostami. Seamless pipes are allowed to produce neutral length - from 4 meters to 12.5. Therefore, when purchasing pipes, you are interested in gta stamps.

Diameters of steel pipes

The diameter of the steel pipe is determined by the outer diameter for electrical welded and seamless pipes, and for VGP - on the diameter of the conditional passage (often referred to as Du). I.e, Internal pipe diameter - DU, outer pipe diameter DN, thread diameter - G. The size of the pipes is determined in the millions, but the PPG pipes are often denoted in inches (").

Pipe size VGP (GOST 3262-75)

The main sizes of the pipe: 15 mm (1/2 "inches); 20 mm (3/4"); 25 mm (1 "); 32 mm (1 1/4" inch with a quarter); 40 mm (1 1/2 "); 50 mm (2"). There are also the following DU: 10 mm, 65 mm, 80 mm, 90 mm, 100 mm, and even 125 mm - but they are rarely used and, as a rule, are replaced by other types of steel pipes (for example, electric welded). Most often for risers are used pipes 3/4 "for internal wiring 1/2".

E / C pipes (GOST 10704-91)

E / from straight pipes are the following outer diameters (in millimeters): 10; 12; 13; fourteen; sixteen; 17; 17.5; eighteen; nineteen; twenty; 21.3; 22; 24; 25; 26; 28; thirty; 32; 33; 33.7; 36; 38; 40; 42; 43; 45; 48; 51. With a diameter of up to 57 mm, the VGP tube of the appropriate size is used. The most popular dialing pipes according to GOST 10704-91 in size from 57 mm and above. Their main diameters: 57; 60; 63.5; 76; 89; 102; 108; 114; 127; 133; 140; 146; 159; 168; 178; 193; 219; 245; 273; 325; 377; 426; 530.

Welded pipes for gas pipelines (GOST 20295-85)

Start with a diameter of 159 mm and up to 530 mm go with the same dimensions as the pipes according to GOST 10704-91. Basic larger diameters (in millimeters): 630, 720, 820, 1020,1220, 1420.

Pipe size G / K seamless (GOST 8732-78)

Frequently used diameters of seamless hot-fixed pipes (mm): 32; 38; 42; 45; 51; 54; 57; 60; 63,5; 68; 70; 73; 76; 83; 89; 95; 102; 108; 114; 121; 127; 133; 140; 146; 152; 159; 168; 180; 194; 203; 219; 245; 273; 325; 351; 426.

Plants Manufacturers can make any pipe sizes at the request of the customer.

Internal diameters of pipes

According to the standard row adopted in most countries pipe They have the following inner diameter measured in mm: 6, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 200, etc.

The measurement system is also used to the thread diameter in inches. 1 "\u003d 25.4 mm.

The table shows dimensions of pipes (diameters) in mm and inches:

Conditional Pipe Pipe (DY) mm	Thread diameter (G), inch	Outer diameter of the pipe (DN), mm
		Water pipe steel pipe	Seamless	Polymer

When installing the system of steel pipes for residential buildings, pipes are usually used with the size of the internal diameter DU \u003d 15, 20 and 32 mm.

Cast-iron non-pressure pipes with a diameter of DU \u003d 50 and 100 mm most frequently used.

Currently, pipes made of polymeric materials that displace cast iron and steel are increasingly used for laying out-of-house pipelines.

It should be indicated that, depending on the type of material used in the manufacture of pipes, various designations are used. In most cases, steel and cast iron pipes are denoted by conditional passage or inner diameter. Pipes from copper, some types of steel pipes, pipes made of polymeric materials are denoted by outer diameter. Therefore, it should be carefully related to the choice of the necessary pipe, as well as take into account the wall thickness.

External pipe diameters and pipe wall thickness

Outer diameter, DN mm	Wall thickness, mm
Steel water pipes GOST 3262-75
Steel electric welded pipes GOST 10704-91 GOST 10705-80
Plastic pipes

The most important parameters of pipe products are diameters of pipes in inches and millimeters. Many real estate owners face the need to replace the pipeline system and, accordingly, with the search for the required materials. A high-quality assembly can be ensured under the condition that the diameter of the pipe and the size of the connecting elements coincide.

Dimensional designations of modern types of pipes

When choosing the necessary products regardless of the dependency, from which material they are made, a number of indicators should be taken into account:

1. Outer diameter (DN) in millimeters. The main characteristic of the pipes. The amount of the inner cross section of the pipe and the double wall thickness is an external parameter.
2. Inner diameter (working section) in millimeters. This parameter is of great importance for determining the system's passability. To find out, it is necessary from the outer diameter to subtract the double size of the thickness of the pipe wall.
3. Wall thickness in millimeters (s). This parameter depends on the quality of pipe products - its volume and strength. It is calculated as a difference between the values \u200b\u200bof the outer and inner section of the pipe.
4. Conditional passage in millimeters marked as DU. It is averaged internal diameter value, which is rounded to a standard parameter to the most side. This size is taken into account when the appropriate fittings and fittings are chosen.
5. Nominal diameter in inches. This concept was introduced to standardize the marking of products produced from different materials. The value is equal to the value of the conditional passage (read also: "The conditional diameter of the pipe is that? Norms and standards"). This parameter allows you to select products made from different types of raw materials when combining them in the system. The fact is that the size of pipes in inches are indicated on steel pipe products, but copper and aluminum are marked in millimeters. Values \u200b\u200bin inches need to round.

Measuring systems for pipes

There are two ways to measure, the emergence of which has historical roots:

• imperial system - It is expressed in inches. Currently, it is used exclusively for water and gas pipelines made of steel and reinforcement to arrange water pipeline;
• metric system It has the following units of measurement - millimeters, centimeters, meters. It is used for all other types of pipe products.

In the case of docking pipelines made from various materials, difficulties arise in recalculation of millimeters and vice versa. An ordinary inch is 25.4 millimeters - it is used to measure the diameter of the internal. But there is a special unit of measure - it is an inches pipe, which is 33.249 millimeters. Its feature is explained by the fact that it includes the diameter of the inner and thickness of the two walls. The exception is the water duty in ½ inches.

Differences between the metric and inch dimension system

Visually will not be difficult to distinguish an inch tube from the metric. To do this, just look at thread threads. At the same time, the difference in degrees between the turns with the naked eye is almost impossible to notice, because in the inch product it is 55, and in the metric - 60. But not to see that the pipe is one inch the thread is almost impossible.

To measure the thread step, you can apply a special device called a threader, but when it does not fit the usual school line or any other measuring device.

Metric pipes are measured only by outer boundaries of threads, and inch - exclusively on the inner surface. To find out the size of the pipe in inches and mm,

an imperial or metric measurement system should be used, each of which is currently in demand.

Translation of inch sizes in metric values

If necessary, you can use special reference literature containing the relevant tables. For example, in GUT, regulating the parameters of the WGP, there are values \u200b\u200bof as an inch conditional transition and millimeter.

So, if you use the table, it becomes clear that the inch pipe dimensions will not be 25.4 millimeters. The conditional passage is 25 millimeters with an outer diameter of -33.6 millimeter.

The most convenient table contains the value of the conditional passage of the pipe, expressed in inches, its external size and equivalent diameter in millimeters. It corresponds to an inch bandwidth. So the steel segment of a 1-inch pipeline can be connected to a polyethylene product, which has a conditional passage of 25 millimeters.

What is the size of inch pipes in mm?

The construction market is popular for 2 sizes of structures:

• 1 \\ 2 and 3 \\ 4 - constitute a separate category. Due to the special thread parameters (1.814), by 1 unit. Measures account for 14 threads;
• within 1 - 6 inches, a step decreases to 2.309, forming 11 threads that do not affect the reduction or improvement of the quality of the connection.

One inch is a length of 25.4 mm, it is used to determine the internal parameters, but when laying reinforced pipes, the diameter is 33.249 mm (including the inner section and 2 walls). In the sortiment of steel structures there is an exception - products in ½ inches, where the outer section is 21.25 mm. This parameter is used when calculating the dimensions of pipes with a cylindrical thread type. When calculations for pipes with a cross-section of 5 inches, the inner size will be 12.7 cm, and the external - 166,245 (reduced to 1 decimal sign).

The difference between measurement systems

According to external parameters, inches do not differ from the metric, the difference lies in the type of notch. Two types of threads in the inch system - English and American. The first option corresponds to the corner of the notch 55 gr., And the metric (American) system with an angle of 60 gr. Generally accepted.

With different degrees, it is difficult to distinguish an angle of 55 - in inches and 60 - in metric structures, and the yarns of the threads are visible immediately, the occurrence of the error is impossible. For measurement step, the thread is a threader, but instead it is well used a common line or another device.

Replacing steel pipes polymer

Steel products are used in the gas and water supply network, the diameter of which is indicated in inches (1 ", 2") or shares (1/2 ", 3/4). When the cross section is measured 1, "resulting in 33.5 mm, which corresponds to 1" (25.4 mm). With the arrangement of pipeline reinforcing elements, where the parameters are indicated in inches, there are no difficulties. But when installing instead of steel structures, products from PP, copper or stainless steel, it is required to take into account the difference in the name and parameters.

To create a given stream level, the inner diameter of pipes is taken into account. For inch ordinary pipes, it is 27.1 mm, for reinforced 25.5 mm, the most close to 1 ". Pipelines are denoted in conventional units of the flow section (DN). It defines the parameters of the lumen of the pipes and is indicated in the digital values. The step of the conditional passage is selected, taking into account the increase in the capacity by 40-60% with increasing index. If the external cross section is known and the design of the structures, using the size table, is determined by the inner cross section.

In the process of connecting steel pipes with polymer structures, replacing one to others, conventional adapters are used. The inconsistency of the size is obtained as a result of the use of copper, aluminum or stainless steel products manufactured by metric standards. Real metric dimensions of pipes are taken into account - internal and external.

Steel pipes of the Russian Federation in comparison with Eurostandard

For comparison of the sorting of pipes according to GOST RF and Eurostandards, the following table is used:

How to determine the choice of diameter?

From the diameter of the water pipes depend on their capacity - the volume of water, passed for 1 unit. time. It depends on the speed of water flow. With its increase, the risk of pressure drop in the highway increases. Bandwidth characteristics are calculated by formulas, but planning intra-ordinary wiring, take the pipes of certain parameters.

For a plumbing system:

For the riser, structures with an internal cross section are used:

In view of the fact that the inner cross section of the semi-leak polymer pipes varies in the range from 11 to 13 mm, and one-name - from 21 to 23, to determine the accurate parameters when replaced by an experimental plumber. With a complex type of layout, numerous joints, turns and gaskets of the network at a high distance, a reduction in pressure, it is necessary to provide the possibility of performing pipe wiring with a large cross section. With an increase in diameter, the level of pressure is increased.

Below is a table for determining the passability of steel pipes:

Pipe diameter of steel

The cross section of the pipes corresponds to a number of indicators:

• The conditional diameter (Du, DY) is the nominal parameters (in mm) of the inner cross section of pipes or their rounded indicators, in inches.
• Nominal parameter (DN DN,).
• External size. The metric calculation system allows you to classify the structures to small - from 5 ... 102 mm, medium - from 102 ... 426, large - 426 mm and more.
• Wall thicknesses.
• Internal diameter.

The inner cross section in pipes with different threads corresponds to the parameters:

• 1/2 inches pipeline - 1.27 cm;
• 3/4 inches - 1.9 cm;
• 7/8 inches - 2.22 cm;
• 1 inch - 2.54 cm;
• 1.5 inches - 3.81 cm;
• 2 inches - 5.08 cm.

To determine the thread diameter, the following indicators are used:

• 1/2 inches pipeline - 2.04 - 2.07 cm;
• 3/4 inches - 2, 59 - 2.62 cm;
• 7/8 inches - 2.99 - 3 cm;
• 1 inch - 3.27 - 3, 3 cm;
• 1.5 inches - 4.58 - 4.62 cm;
• 2 inches - 5.79 - 5.83 cm.

Table matching the diameter of steel pipes by polymer structures:

Steel pipe prices:

Diameter of pipes PP.

PP pipes are produced with a diameter of 0.5 to 40 cm and more. The diameter is internal and outdoor. The first indicator allows you to find out the amount of media passable for 1 unit. time. The external cross section is used to carry out construction counts, namely the choice of a niche or pit for laying a highway. External parameters allow you to correctly select fittings with the corresponding internal indicators.

• Small - 0.5; one; 1.5; 2; 2.5; 3.2; four; five; 6.3 and 7.5 cm serves for heating systems, drain and water supply in private buildings. The inner cross section is 3.2 cm most popular in high-rise buildings.
• Current - 8; nine; 10; eleven; 12.5; sixteen; twenty; 25 and 31.5 cm serves to arrange water supply and sewer systems, allowing you to change pig-iron products with similar external parameters. The internal size of 8, 9 and 10 cm is ideal for chemical environments.
• Big - 40 cm and more used to improve cold water supply and ventilation systems.

Pipes are marked in inches and mm. When choosing structures for the plumbing and heating system, the wall thickness is taken into account, which affects the conditional passability of highways with the same external parameters. With an increase in its parameter, the pressure in the plumbing system is allowed. Small dimensions make it possible to reduce the level of the cost of buying material and water consumption.

Inch tube - dimensions in mm and diameter

Inch tube - dimensions (in mm), specifications and prices. Table of compliance of steel and plastic products for gas and water supply. The difference between GOST and Eurostrights.

Pipe 1 inch - Which diameter

Mount the communication system of any kind in such a way to completely avoid compounds, it is impossible. If only because the pipeline is eventually summed up to some object of consumption - plumbing, radiator, washing machine, and is connected to the output nozzle of the device. And the main condition for hermetic high-quality assembly is the correspondence of the diameter of the pipe and the size of the connecting element.

Dimensional pipe parameters

Regardless of the manufacturing material - polymer, metal, ceramics, and so on, the product is characterized by a number of indicators, focusing on which the consumer can choose the required product.

• The outer diameter is, that is, the outer size of the pipe (we are talking only about the circular section).
• Internal - size of the workplace.
• Wall thickness - largely determines the strength of the product.

The sum of the inner diameter and double wall thickness is external. The actual position of things to this statement corresponds to. But when it comes to VGP, it is necessary to take into account this is what moment. Most often, the water fluids are connected by a threaded method. The thread is applied to the outer part, as a result, the diameter of the thread is not equal to the outdoor size. And since it is important for the installation to know exactly the thread indicators, then this parameter is more important and often indicated instead of the actual product size.

For example, a 1-inch water duty is not equal to an external diameter of 2.54 cm, as 1 inch is an indication of the thread size.

This confusion is exacerbated by using two measuring systems on the one hand, and a variety of products existing today on the other.

Conditional pass

The task of the water supply system is to the uniform supply of all consumers with due water. The main calculation parameters is the throughput of the pipeline, that is, the amount of water that can pass per unit of time.

• This parameter is called conditional passage - DN. The units of measurement as such does not have - this is a conditional, non-infact value, is indicated in integers and denotes an exemplary conventional lumen of the pipe. The step between the values \u200b\u200bis calculated theoretically, with such a condition so that with each next increase, the capacity of the pipeline increased by 40-60%.

The convenience of the system is obvious only with practical use. It is enough on the table to choose water devices and fittings with equal conditional passage to ensure that the working water supply system is guaranteed.

Accordingly, the steel pipe in 1 inch has a conditional passage of 1 inch, and its actual inner diameter is 25.5 mm, outdoor with threads - 33, 25.

Measuring systems

The presence of two methods of measurement has historical roots.

• Imperial - in inches, today is used only for water and gas pipeline steel pipes and the corresponding water fittings.
• Metric - in mm, cm and m. Used for any other pipe products.

When docking the water pipes from different materials and arise difficulties with recalculation from one system to another.

Inch and metric pipes

We are manufactured as inch and standard steel waterways, which confuses even more. You can visually distinguish them by the type of threads - the pipe in 1 inch the thread is rounded. Samples are demonstrated in the photo.

Thread step is measured differently. In the metric products on the outer borders of the threads, in inches - by internal. Distance is different with different sizes.

The pipe 1 inch, which is used in the imperial system is not equal to 2, 54 cm, as it should be, and is 3, 3249, since it includes the inner size, and the wall thickness. The exception is a ½ inches water water.

Translation of inch sizes to metric

Reference reference contains appropriate tables. The same GOST, regulating the parameters of the VGP, indicates as an inch conditional passage and millimeter. Unfortunately, the actual value of the internal diameter is also necessary for assembling the system to one whole. While the tables are more likely to be outdoor.

The most convenient table contains the value of the conditional passage in inches, the external size of the pipe and the equivalent diameter in mm. It indicates such a bandwidth that corresponds to an inch.

For example, a 1-inch steel water conduit can be connected to polyethylene, the conditional passage of which is 25 mm.

Diameters of steel pipes

In practice there are diameters: nominal, internal, outdoor, conditional passage. Values \u200b\u200bindicate in the labeling of pipes: for steel - in inches, for others - in millimeters. How to determine the diameter of the steel pipe in mm? This will help the tables of conformity of the diameters of steel products.

Steel pipes with a diameter of 100 mm

The main characteristic of the steel pipe is its diameter. This parameter determines the purpose, the length of the pipeline, the composition and physical characteristics of the transportable substance. All diameter values \u200b\u200bare standardized and regulated by regulatory documents - sizes and requirements for products are regulated by GOST. Each type of pipe corresponds to its standard.

What diameters of pipes exist

Theoretically, the pipe diameter is sufficiently simplified to the formula when determining any values. In practice, everything is more complicated - the outer, internal, nominal diameters, the thickness of the wall differ. What concepts meet and what they mean:

1. Conditional passage - the inner size of the pipe, determined in millimeters. In inches requires rounding the magnitude. Used to properly docking two products, such as pipeline and fitting.
2. The thickness of the walls of the pipe (S) is a physical value in millimeters, from which many high-quality indicators of the product depend on, including permeability, volume. Determined as the difference between the outer and inner diameter.
3. The inner diameter is a physical value in millimeters, an important parameter to determine the lifeline. Formula for calculation: double \u003d DN-2S
4. The outer diameter (DN) - has small sizes (5 ... 102 mm), medium - 103 ... 426 mm, large - 427 mm and more.
5. the zero diameter is close to the conditional passage, but has more accurate values.

Numerical size of steel pipe diameters

A huge range of steel pipes for various purposes, execution, species is presented in the form of tables where the main parameters are:

• conditional passage (or nominal diameter);
• the outer diameter of the pipe;
• wall thickness.

Sometimes in the table of diameters of steel pipes, the weights of the product are introduced depending on its size, as well as the parameters of the nominal diameter.

Table values \u200b\u200bof steel pipe diameters

Tables are convenient to use when determining the exact dimensions of products when they are connected. For example, pipes made of steel most often denote in inches - this dimension is adopted in many corners of the world. While polymeric products are taken to calculate in millimeters, which creates some difficulties when docking metal-plastic, cast-iron, copper pipes with steel in a plumbing system. Diameter conformity tables help determine the desired dimensions of the docking elements and connect them correctly.

In Table 1, the parameters of the conditional passage in mm correspond to certain values \u200b\u200bof the internal diameter in inches. Note how the values \u200b\u200bof the outer diameter differ in different types of pipes: seamless, electric welded, metalplastic. The difference can reach 17 mm.

How to translate inches in millimeters

Inch dimension when transferring to millimeters is rounded into the biggest side. It is obvious that, knowing the constant 1 inch is 2.54 cm, you can independently calculate the values \u200b\u200bof the diameter according to the metric dimension. But the problem is not in how to calculate, but how to correctly determine the diameter. According to practical measurements of steel pipes, their marked diameter in inches does not correspond to the measured data in millimeters. That is, the size of 1 "(respectively 25.4 mm), and in fact it turns out 33.5 mm. What is the reason for this inconsistency?

First of all, in the designation of the stamp the inner diameter of the pipe. Secondly, the dimensionality of the conditional pass (DB) is taken as a unit of measurement of diameter, which is indicated in integers. Moreover, the size of the size increases with increasing index (crossing) pipes by 40-60% with each step. The conditional passage of the pipe corresponds to the inner lumen (nominal diameter) of the line, but the integer is taken as the final value with the rounding calculated in the largest. Standardize the conditional passage of the highway according to GOST 355-52.

To properly select the elements of the gas and water supply system with an inch marking, the best option will be applying tables. When connecting elements of water-gas with metric and inch measurement systems (for example, steel pipelines with products from copper, brass, polypropylene) It is important to consider not only internal, but also the outer diameter.

Standard steel pipe sizes

Generally accepted standard values \u200b\u200bof the internal diameter of steel pipes are determined near: 6, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 110, etc. The conditional passage of the pipe calculated in inches, when recalculating the metric system, it is just rounded up to the nearest parameter from the standard row.

The most common pipes are diameter from 426 to 1220 mm. These are highways for water, gas pipeline, sewer, irrigation systems.

For water pipes and heating, small diameter pipes are used in the apartments of multi-storey and private buildings. The products of the average diameter of steel are used for risers in the urban infrastructure, as well as in the oilfield industry. These are products with a diameter ¾ ", for wiring inside ½".

According to tables, the diameters of plastic, copper, brass are determined similarly. The method of translating inch dimension to metric is used when combining products from different materials. In the presence of fittings, the installation of gas producing highways from steel is simplified - these nuances are already taken into account in the connecting elements.

Diameters of steel pipes: Table, Dimensions in inches and millimeters, Gosty

In practice there are diameters: nominal, internal, outdoor, conditional passage. Values \u200b\u200bindicate in the labeling of pipes: for steel - in inches, for others - in millimeters. How to determine the diameter of the steel pipe in mm? This will help the tables of conformity of the diameters of steel products.

Mount the communication system of any kind in such a way to completely avoid compounds, it is impossible. If only because the pipeline is eventually summed up to some object of consumption - plumbing, radiator, washing machine, and is connected to the output nozzle of the device. And the main condition for hermetic high-quality assembly is the correspondence of the diameter of the pipe and the size of the connecting element.

Dimensional pipe parameters

Regardless of the manufacturing material - polymer, metal, ceramics, and so on, the product is characterized by a number of indicators, focusing on which the consumer can choose the required product.

• The outer diameter is, that is, the outer size of the pipe (we are talking only about the circular section).
• Internal - size of the workplace.
• Wall thickness - largely determines the strength of the product.

The sum of the inner diameter and double wall thickness is external. The actual position of things to this statement corresponds to. But when it comes to VGP, it is necessary to take into account this is what moment. Most often, the water fluids are connected by a threaded method. The thread is applied to the outer part, as a result, the diameter of the thread is not equal to the outdoor size. And since it is important for the installation to know exactly the thread indicators, then this parameter is more important and often indicated instead of the actual product size.

For example, a 1-inch water duty is not equal to an external diameter of 2.54 cm, as 1 inch is an indication of the thread size.

This confusion is exacerbated by using two measuring systems on the one hand, and a variety of products existing today on the other.

Conditional pass

The task of the water supply system is to the uniform supply of all consumers with due water. The main calculation parameters is the throughput of the pipeline, that is, the amount of water that can pass per unit of time.

• This parameter is called conditional passage - DN. The units of measurement as such does not have - this is a conditional, non-infact value, is indicated in integers and denotes an exemplary conventional lumen of the pipe. The step between the values \u200b\u200bis calculated theoretically, with such a condition so that with each next increase, the capacity of the pipeline increased by 40-60%.

The convenience of the system is obvious only with practical use. It is enough on the table to choose water devices and fittings with equal conditional passage to ensure that the working water supply system is guaranteed.

Accordingly, the steel pipe in 1 inch has a conditional passage of 1 inch, and its actual inner diameter is 25.5 mm, outdoor with threads - 33, 25.

Measuring systems

The presence of two methods of measurement has historical roots.

• Imperial - in inches, today is used only for water and gas pipeline steel pipes and the corresponding water fittings.
• Metric - in mm, cm and m. Used for any other pipe products.

When docking the water pipes from different materials and arise difficulties with recalculation from one system to another.

Inch and metric pipes

We are manufactured as inch and standard steel waterways, which confuses even more. You can visually distinguish them by the type of threads - the pipe in 1 inch the thread is rounded. Samples are demonstrated in the photo.

Thread step is measured differently. In the metric products on the outer borders of the threads, in inches - by internal. Distance is different with different sizes.

• ½ and ¾ - a step is 1.814 mm.
• From 1 inches to 6 - 2, 309.

The pipe 1 inch, which is used in the imperial system is not equal to 2, 54 cm, as it should be, and is 3, 3249, since it includes the inner size, and the wall thickness. The exception is a ½ inches water water.

Translation of inch sizes to metric

Reference reference contains appropriate tables. The same GOST, regulating the parameters of the VGP, indicates as an inch conditional passage and millimeter. Unfortunately, the actual value of the internal diameter is also necessary for assembling the system to one whole. While the tables are more likely to be outdoor.

The most convenient table contains the value of the conditional passage in inches, the external size of the pipe and the equivalent diameter in mm. It indicates such a bandwidth that corresponds to an inch.

For example, a 1-inch steel water conduit can be connected to polyethylene, the conditional passage of which is 25 mm.