2 5 inches which diameter in mm. Pipe inch dimensions in mm. Steel pipe seamless

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 approximate to 1 ". Pipelines are denoted in conventional units of the du (Dn). It determines the parameters of the lumen of the pipes and is indicated in the digital values. Sections are selected, taking into account the increase in the capacity by 40-60% with an increase in the index. If the external cross section is known and the design of structures, using a table of size, the inner cross section is determined.

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:

1.5 cm (1/2 inches)
1 cm (3/8 inches).

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

2.5 cm (1 inch);
2 cm (3/4 inches).

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.

Cost of PP pipes:

Video

The diameter is one of the most important dimensional characteristics of steel pipes. Thanks to this parameter, as a diameter, you can produce all the necessary design calculations.

Standard diameters of steel pipes are strictly regulated by GOST 10704-91.

Purely conditionally diameters of pipes are divided into the following categories:

- large diameter (more than 508 millimeters),

- The diameter of the average (114-530 millimeters)

- and small diameter (no more than 114 millimeters).

Main overall characteristics

It is precisely for these characteristics and the diameters of steel pipes according to the Gostas and TU are determined:

internal pipe diameter;
the outer diameter of the pipes - performs their main dimensional characteristic of the GOST;
conditional diameter of the pipe. Represents the nominal size of the internal diameter of the pipe;
pipe wall thickness;
nominal diameter of the pipe.

Classification of steel pipes on small, medium and large produced it is by external diameter (DN). Standard diameters are shown in the table.
The steel pipes of the following diameters are most often used: 426, 530, 159, 219, 720, 920, 273, 325, 1420 and 1220 millimeters.
Small external diameter of steel pipes is used to build water systems in apartments, houses and other rooms.
Medium diameter Steel pipes are used to mount urban water supply systems, as well as in fishing systems for collecting crude oil.
The largest steel pipes in the diameter are necessary for the construction of main gas and oil pipelines.

Internal diameters of steel pipes

The inner diameter of steel pipes (DVN) with unchanged external diameter can vary significantly. To standardize pipe diameter, such a term is used as "conditional pass (diameter)". It is denoted.
The conditional passage is a rounded nominal size of the internal diameter. It is always rounded in a big way. The value of the conditional diameter of steel pipes GOST 355-52 is determined.
The inner diameter can be calculated according to the following formula: DVN \u003d DN - 2S.
Steel pipes possess internal diameters: 6, 15, 10, 20, 25, 50, 65, 32, 40, 80, 100, 125, 200.

Diameters of steel pipes in inches

In addition to millimeters, the diameter of steel pipes can also be measured in inches. One inch is 25.4 millimeters. The table shows the diameters of steel pipes in millimeters, as well as in inches.

Conditional Pipe Pipe (DY), mm	Thread diameter (G), inch	Outer diameter of the pipe (DH), mm
Conditional Pipe Pipe (DY), mm	Thread diameter (G), inch	Water pipe steel pipe	Seamless	Polymer
10	3/8"	17	16	16
15	1/2"	21,3	20	20
20	3/4"	26,8	26	25
25	1"	33,5	32	32
32	1 1/4"	42,3	42	40
40	1 1/2"	48	45	50
50	2"	60	57	63
65	2 1/2"	75,5	76	75
80	3"	88,5	89	90
90	3 1/2"	101,3	102	110
100	4"	114	108	125
125	5"	140	133	140
150	6"	165	169	160

Video: how to make a hydraulic calculation

The diameter of pipes in inches and millimeters are very important indicators. Many have come across the problem of replacing or installing the pipeline, and the search for the relevant materials for work.

In the huge number of suggestions of the construction market, it is difficult to understand, so before buying, it should be studied in detail what the volume of the pipeline is and, as it is used in practice.

You can immediately use the online calculator for translation without familiarity with the theory.

Online calculator to translate inches in millimeters and back

Example How to enter data into a calculator

In the record of size in inches, it should be separated by an integer part of the number from fractional (if there is) a space: for example 10 1/4, or 20 4/8; Otherwise, it will turn out 101/4 and 204/8. Fractional numbers in millimeters are introduced through a point, and not a comma (25.4 and not 25.4).

Data for calculating Enter the following. order: Click the left mouse button in the corresponding parameter window to appear the flickering cursor; Enter your numbers. The fractional part of the inches is introduced without a sign.

1 inch \u003d 25.4 millimeters (mm). Currently, inch, due to its visibility, is often used to measure the diameters of water-gas pipes and threads. Many details also have dimensions, multiple inches. In addition to the whole inches of measurements are carried out in the fourth (1/4 "), eighth (1/8"), sixteenth (1/16 "), thirty second (1/32") of inches, etc.

If you have questions about the use of online calculator, you can always ask a question in the comment form. We also recommend you to familiarize yourself with the instructions (located under the calculator).

How to translate inch values \u200b\u200bin metric designations

Translation of inches to the metric indicators of pipe volumes are performed, guided by special tables. Here is an example of such a table:

First diameter table ( his characteristic designation - Ø, will be referred to in the article) The pipes shows the values \u200b\u200bin millimeters, and in the second table uses inches ( international designation - inch or in, will further be designated in the article). A little serious master can ask why so? And what designations are considered correct?

The reason is that a metric system is applied worldwide. The basis of this system is two indicators: conditional and nominal volume. Suitable for these concepts in different ways, but ultimately they show external volume. In essence, these values \u200b\u200bare dimensionless, but sometimes they are indicated in millimeters.

Analyzing tabular data can be compared products of domestic manufacturers and analogs of foreign production.

Interesting! The divergence of measurements appeared simultaneously with the introduction of copper systems in Europe in the second half of the 20th century. In Russia, at that time, standards for the metal sorting were determined in mm, and not in Inch, this measurement system is extensively used today.

Compliance of two designations

In water and gas systems, steel pipes are widely used. Their dimensions show entire values \u200b\u200bor their shares. For example, the diameter of the pipe product in size in 1 inch in mm will be equal to 33.5, and the diameter of the pipe product is 2 inches in mm corresponds to 67.

This certainly does not correspond to the declared 25.4 and 50 mm. When laying fittings with inch designations to products in 1 and 2 inch difficulties does not occur, but replacement for plastic and copper products requires accounting of inconsistencies in the notation.

Why complicate everything so much? The fact is that it is important to consider internal size to form a fluid flow. For these reasons, it was exactly this indicator of the 1dumin, 2-wing and all other pipe rolling materials. The most accurate consider indicators in the values \u200b\u200bof the conditional passage.

The conditional passage of the 1styumovoy, 2nd and the rest of the pipe as the lumen is equal to the size of the lumen. To refer to the metric size of 1 inch, 2 inch and any other pipeline, recommend using tables.

Accurate definitions - formula for calculating

These knowledge is needed to calculate the number of transported medium. This is very important for heating systems. For example, when it is necessary to pave the heating system, it is necessary to determine and calculate the size of the sorting in the section so that all housing is uniformly.

How to accurately determine the cross section of each pipe in such values \u200b\u200bsuch as inches can suggest formula: D \u003d SQRT ((314 ∙ q) / (V ∙ DT)).

D - internal volume of pipe rolling;
Q is a heat flow that is defined in kW;
V denotes the speed of the heat carrier, it is determined in m / s;
DT is the difference in temperature indicators, input and network output;
sQRT - Square root.

Watch the video

Despite the presence of formulas to determine Ø help tables. In this way, a large amount of time wins.

What is an inch volume

Deciphering the diameter of the pipes provided in inches is simple. They are often measured in these values. Such one unit is 3.35 cm. It has already been indicated, deciphering this value has discrepancies, and is due to the fact that the sorting is measured not by external volume, but by internal. For example, an internal encharge of an inch tube blanks can be different: from 2.55 to 2.71 cm. This value varies depending on the wall thickness.

Pipe with a size of 1 inch has an outer diameter of 25.4 mm, a pipe having 2 inch, in a metric dimension equals 50 millimeters. Where does the technical parameters of the pipe cylindrical thread take the numbers 33,249 and 66,498?

This thread on 1 and 2 inches is performed on the external volume. Therefore, the ratio of the diameter of the thread to the inner volume is conditional. Based on this, the dimensions of 1 and 2 inches pipe rods are calculated by adding the value of 25, 4 or 50 with two thicknesses of the pipe walls.

Before making decryption, you need to consider that the measurements of the product must be performed outside, but from the inside. Why do you need it? The fact is that fastening the plots of the highway from different materials, and after performing measurements only outside, it is possible to obtain the wrong result, which will result in an error, as the entire sorting is characterized by wall dimensions.

Also performing decoding, one must not forget that the standards for different companies - producers are different, they all focus on their own indicators.

If it's hard to fulfill such a decoding, then you should contact professionals for help. They will provide effective help when choosing the necessary products.

Compliance with metric and inch parameters

All pipe products are manufactured according to a specific standard, and the pressure indicator is a fixed value. Therefore, it is necessary to know exactly all the pipes shown in inches and mm. Ignoring this compliance, it is impossible to choose a pipe rolling sorting.

Watch the video

When selecting a certain size, it is focused on tabular information, and when replacing the reference, the maximum approximate parameter. There is no accurate matching in two different measurement systems, so often pipeline elements are equated in practice.

How such a correspondence is applied in everyday life, you can find out in the table provided below:

Applying this information, you can accurately determine the correspondence of two types of dimensions of the dimensions, and take part for work, exactly corresponding to each other.

Inch size expression

These indicators are prescribed by an integer, near it put a double touch, for example, 3 ". Also, the size of the diameter of the pipe roller transmitted in inches is prescribed by fraction, for example, ½.

If you consider these sizes on specific examples of the corresponding dimensions, they will look like this:

The diameter of the standard pipe on 12 inch is 300.
The diameter of the pipe product 3 inch is 80.
The 8-inch diameter of the standard pipe rolling is equal to 200.
The diameter of the standard pipe roller, 32, when transferring in inches, shown as 1 ¼
The diameter of the pipe roller 40 mm in Inch is prescribed 1 ½
Ø Standard pipe at 15 in inches is expressed by the number ½
Ø A 4-inch standard product translated into a metric equals 100.
Ø Pipe rolling 3/4 inches in metric translation is 20.
Ø Standard pipe rolling per 1/2 inches in metric translation shows the number 15.

Watch the video

The diameter of pipes in inches and millimeters is used constantly. Knowing these dimensions can be avoided by large difficulties when connecting the elements of the pipeline. And special tables help find the necessary dimensions of the docking parts and correctly produce their fit.

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:

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.
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.
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.
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.
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.

The difference between measurement systems

Replacing steel pipes polymer

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.

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?

For a plumbing system:

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

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.

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.

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:

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.
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.
The inner diameter is a physical value in millimeters, an important parameter to determine the lifeline. Formula for calculation: double \u003d DN-2S
The outer diameter (DN) - has small sizes (5 ... 102 mm), medium - 103 ... 426 mm, large - 427 mm and more.
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

To date tables of steel pipe diameters Relevant for the reason that almost all spheres of construction use pipes from different types of plastic and metal. In order to easily understand this variety of material and learn how to combine them, regulatory documents were developed, the table of the diameters of steel pipes and their compliance with polymer pipes. To calculate the weight of the pipe, or the pipe length you can use the pipe calculator.

Table of steel and polymer pipe diameters.

Outer diameter (DH), Pipes, in mm according to GOST and DIN / EN
Conditional (DY) Pipes,	threads pipe (G) in inches	Outer diameter of pipe D, mm
Conditional (DY) Pipes,	threads pipe (G) in inches		Steel pipes water-base	Steel electros welded and seamless	Polymer PE, PP, PVC

Conditional diameter (DU, DY) is the nominal size (in millimeters) of the inner diameter of the pipe or its rounded value in inches.

Conditional pass It is a rounded nominal size of the internal diameter. It is always rounded in a big way. The value of the conditional diameter of steel pipes GOST 355-52 is determined.

Legend and GOST:

DIN / EN - the main EurosorTal for steel pipes by DIN2448 / DIN2458
Steel water pipes - GOST 3262-75
Steel electric welded pipes - GOST 10704-91
Pipes steel seamless GOST 8734-75 GOST 8732-78 and GOST 8731-74 (from 20 to 530 mm).

Classification of steel pipes on the outer diameter (DN).

Small outer diameter steel pipes It is used for the construction of water supply systems in apartments, houses and other facilities.

Middle diameter steel pipes It is used for the construction of urban water pipes, as well as in industrial systems for collecting crude oil.

Large steel pipes We are necessary for the construction of main gas and oil pipelines.

Standard internal diameter of pipes.

There is a standard of the inner diameter of pipes, which is adopted in most states of the world. The inner diameter of the pipes is measured in millimeters. The following presents the most common internal dimers of pipes:

200, etc.

Inner diameter of steel pipesdenotes (DVN). There is also a certain standard of pipe diameter, it is indicated by the term "conditional pass (diameter)". It is denoted.

The inner diameter of the pipe You can calculate according to the following formula: DVN \u003d DN - 2S.