Pipe steel pipe - the variety and application in the construction of communications

sizes and types

Exterior water networks are rarely supplied with steel pipes, as they have very poor corrosion resistance.Often they are used in places where there is high working pressure with dynamic overload and water hammer, in seismically active regions and in areas with possible soil movement.The water supply systems use several types of tubes:

• Welded gas and water tubes (diameter from 6 to 150 mm);
• Seamless oil, gas and water supply (wall thickness from 4 to 9 millimeters);
• with thin walls and a spiral seam.Despite the thin walls, they are very strong.

Steel pipes laid in the ground, connected by electric welding, and those that are installed in the tunnels and wells, connected to the flange.Flanges are cooked to the ends of the pipe prior to installation pipe electric welding.Individual pipe sections together in, and those in turn, - a loop.The length of the section depends on the weight and rotation process tubes.The individual sections are connected or on the edge of the trench, or trench itself.

Preparation of the welding should take place very carefully.All welds must be well cleaned of rust, scale and dirt to metallic luster.If you do not do it properly, at the junction there is pollution, and fastening becomes very fragile.

Note!Cleaning should take place not earlier than four hours before the start of work.

Specifications GOST

Each production has its GOST and steel tubes are no exception, they GOST 3262-75.This group includes non-galvanized and galvanized welded steel pipes, which are used for gas, water and heating systems.They are made with rolled threads and threaded cylindrical steel according to GOST 1050-88 and GOST 380-88 standards without chemical compositions and mechanical properties.Water pipes made of steel, GOST indicates their technical characteristics, easy to electric welding.

pipes for water supply of steel produced according to the conditional pass and wall thickness:

• Nominal diameter pipe: 150, 125, 100, 90, 80. 65, 50, 40, 32, 25, 20, 15, 10, 8, 6millimeters;
• light pipe wall thickness: 4;3.5;3.2;3;2.8;2.5;2.35;2;1.8 mm;
• average thickness: 4.5;4;3.5;3.2;3;2.8;2.2;2 millimeters;
• For Gain: 5.5;5;4.5;4;3.2;2.8;2.5 mm;

Note!The size of pipe is sometimes specified in inches: 1 inch = 25.4 millimeters.

Steel pipes are made of two types: galvanized and non-galvanized.It will be appreciated that the first mass has 3% more Secondly, it affects the zinc layer, which is applied at least 30 microns thick.

Definition diameter field

is replacing the pipes, it is often necessary to measure its diameter.This requires a special tool, but you can get a ruler and knowledge of the calculation formula.The diameters of the water tubes of steel determined by many ways.Let us consider a few of them.

• Roulette wrapped pipe outside diameter.The resulting length is divided by the number Pi (3.14) - this is the outer diameter;
• To determine the internal diameter, the method of calculating the thickness of the walls at the exit.It has done a ruler or caliper.Subtracted from the OD value of the wall thickness, multiplied by two, and the result is an internal diameter.

These two methods often enough to calculate all the required diameter.However, there are many other methods to do this, but they are more complex, and they are professionals.For laymen the above methods will give all the necessary information to quickly determine the diameter without special tools.

Tip!Although it is possible to determine the diameter of the means at hand, it is always better to carry a special measuring tool, which will give more accurate data.