In how many categories do cylinder tubes conventionally divided?

June 28, 2021

Read about the types and applications of cylinder tubes

cylinder tubes

All manufactured cylinder tubes can be divided into two large groups: seamless and electro welded. They differ in some parameters, but they may well be used for domestic purposes.

Seamless pipes

A distinctive feature of seamless pipes is the integrity of their structure. They are divided into cold and hot deformed.

They can have an outer diameter and wall thickness of 5-250 mm and 0.3-24 mm, respectively.

Dimension of cylinder tubes

Their outer diameter and wall thickness can vary between 28-530 mm and 2.5-75 mm, respectively. Such products have a higher rigidity compared to cold-deformed ones and bend poorly.

Externally, hot-deformed cylinder tubes have a rough surface.

Electro welded pipes

A characteristic feature of pipes of this type is the presence of a connecting weld in their structure. They are divided into two types: straight and spiral seam.

Similarly, their outer diameter and wall thickness can be 10-1420 mm and 1-32 mm, respectively. In addition, their outer diameter and wall thickness vary between 159-2520 mm and 3.5-25 mm, respectively.

Cylinder tubes are not design for high pressure operation and are usually good for the construction of water pipes or heating mains.

What are the main characteristics of cylinder tubes?

The main characteristics of steel pipes are diameter, wall thickness and length. Moreover, all of them lay down in regulatory documents for each type of pipes.

Pipe diameters:

In addition to wall thickness, several different diameters are good to use to describe the cross-sectional dimensions of cylinder tubes: The inner diameter is always indicating in millimeters; NPS is a dimensionless value. It is similar to the inner diameter, but may not be the same size.

In fact, the nominal bore rounds up or down value of the average internal diameter of the pipes. Similarly, its value is important when calculating for the entire liquid, steam or gas supply system. The convenience of this parameter becomes apparent in practical use.

In this case, for the assembly of a guaranteed efficient system, pipes and fittings with the same nominal bore are common to select; Outside diameter is the main overall dimension of the pipes.

In how many categories do cylinder tubes conventionally divided?

Outside diameter categories Metal cylinder tubes are produced with an outer diameter from 10 mm to 1420 mm.

Three categories of cylinder tubes:

By the value of this parameter, they are conventionally dividing into three categories:

  1. 1. With an outer diameter of 10 mm to 108 mm, pipes classify as products with a small diameter. They are good to use for laying plumbing systems in apartment buildings and private houses;
  2. 2. With an indicator from 114 mm to 530 mm - to pipes with an average diameter. They are good to use in crude oil collection systems and in the construction of urban water pipes;
  3. 3. With an outer size from 530 mm to 1420 mm - for pipes with a large diameter. They are good to use in the laying of oil and gas trunk pipelines.

Cylinder tubes length

The length of the cylinder tubes measure. In the first case, it is strictly good to maintain in the shipped batch, and its limit values ​​are laid down in the regulatory document for the corresponding product.

cylinder tubes 2021

In the second, pipes in a batch can have different lengths, but not less than a certain value.

Wall thickness

The possible pipe wall thickness is indicated in the relevant GOSTs. In addition, we divide them into four categories based on the ratio of outer diameter to wall thickness: With an indicator of more than 40, pipes classify as especially thin-walled;

It is with a ratio in the range of 12.5-40 - to thin-walled; with a ratio in the range of 6-12.5 - to thick-walled; with an indicator of less than 6 - to especially thick-walled.
Differences between inch and metric pipes

The situation is further complicated by the fact that modern manufacturers produce metric and inch water cylinder tubes. With sufficient experience, they are easy to distinguish visually by the profile of the thread: in inch products, its threads are more round.

Another characteristic difference is the thread pitch. For ½” and ¾” pipes it is 1.814 mm, and for products in the range from 1 ″ to 6 ″ it is 2.309 mm.

What are the advantages of steel cylinder tubes?

  • strength, withstand pressure up to 30 atmospheres;
  • Moreover, good resistance to dynamic loads and bending forces;
  • resistance to mechanical damage;
  • Similarly, incombustibility;
  • heat resistance, can withstand high liquid temperatures up to 130 ◦С;
  • In addition, full disposal of pipes is possible after the end of their life cycle.

Disadvantages of steel cylinder tubes:

  • high weight;
  • tendency to corrosion or deposits on the inner surface of cylinder tubes, depending on the composition of the transported liquid, or corrosion of the outer surface (“soil” corrosion);
  • high thermal conductivity;
  • significant internal roughness, which increases during operation;
  • violation of the protective coating (for example, zinc) when connecting pipes by welding.

Why cylinder tubes are becoming highly popular these days?

Recently, steel pipes are becoming more and more popular, because they are ideal for creating gas and oil products, heating mains. In addition, it is assumed that steel pipes are easy to use even during construction, since they come by optimal reliability.

Features of the use of steel cylinder tubes

Steel cylinder tubes are ideal to replace plastic pipes. The demand for steel remains at an optimal level, as a result of which similar products will be produced in the future. When choosing steel pipes, it is extremely important to take into account the current GOST


The most popular for domestic use are water and gas pipes. Knowing their basic parameters, as well as the features of metric and inch products and the differences between them, both types of materials are easy to use for a plumbing or heating system.

--- END ---