STEEL WATER AND GAS PIPES

Technical Terms

GOST 3262-75

Date of introduction 01.01.77

This standard applies to non-galvanized and galvanized steel welded pipes with threaded or rolled cylindrical threads and without threads used for water and gas pipelines, heating systems, as well as for parts of water and gas pipelines.

(Changed edition, Amendments No. 2, 3, 5).

1. VARIETY

1.1. Pipes are made according to the dimensions and weight given in table. 1.

At the request of the consumer, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in table. 2.

1.2. The length of the pipe is made from 4 to 12 m:

a) measured or multiple measured lengths with a 5 mm allowance for each cut and a maximum deviation for the entire length plus 10 mm;

b) unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of off-gauge pipes.

(Changed edition, Amendments No. 3, 4).

Table 1

Table 2

Notes: 1. For a thread made by the knurling method, it is allowed to reduce its internal diameter on a pipe by up to 10% along the entire length of the thread. 2. The mass of 1 m of pipes is calculated with a steel density equal to 7.85 g /cm 3 . Galvanized pipes are 3% heavier than non-galvanized ones. (Modified edition, Amendments No. 1, 3)

1.3. Limit deviations in pipe dimensions should not exceed those indicated in table. 3.

Table 3

Notes: 1. The maximum deviation to the plus side in the wall thickness is limited by the maximum deviations in the mass of pipes. 2. Pipes of normal manufacturing accuracy are used for water pipelines, gas pipelines and heating systems. Pipes of increased manufacturing accuracy are used for parts of water and gas supply structures.

(Changed edition, Amendment No. 3).

1.4. Maximum deviations in pipe weight should not exceed + 8%.

At the request of the consumer, the maximum deviations in weight should not exceed:

+ 7.5% - for the party;

+ 10% - for a single pipe.

(Changed edition, Amendments No. 2, 5).

1.5. The curvature of pipes for 1 m of length should not exceed:

2 mm - with nominal bore up to 20 mm inclusive;

1.5 mm - with a nominal bore over 20 mm.

1.6. The pipe threads can be long or short. The requirements for the thread must correspond to those indicated in table. 4.

Table 4

1.7. Pipes with nominal bore 6, 8, 10, 15 and 20 mm are coiled into coils at the request of the consumer.

Legend examples

Ordinary pipe, non-galvanized, of normal manufacturing accuracy, off-gauge length, with a nominal bore of 20 mm, wall thickness of 2.8 mm, without thread and without coupling:

Pipe 20 х 2.8 GOST 3262-75

Same, with clutch:

Pipe М-20 х 2.8 GOST 3262-75

The same, measured length, with thread:

Pipe Р-20 х 2.8 - 4000 GOST 3262-75

Same, zinc-coated, off-gauge length, threaded:

Pipe Ts-R-20 x 2.8 GOST 3262-75

The same, zinc coated, measured length, threaded:

Pipe Ts-R-20 x 2.8 - 4000 GOST 3262-75

For pipes for thread rolling, the letter H is indicated after the word "pipe" in the symbol.

For pipes with long threads, the letter D. is indicated after the word "pipe" in the symbol.

For pipes of increased manufacturing accuracy, the letter P. is indicated in the symbol after the size of the conditional passage.

(Modified edition, Amendment No. 1).

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to the technological regulations approved in the prescribed manner, from steels in accordance with GOST 380-88 and GOST 1050-88 without standardization of mechanical properties and chemical composition.

Pipes for parts of water and gas supply structures are made of steel in accordance with GOST 1050-88.

2.2. At the request of the consumer, the ends of pipes to be welded with a wall thickness of 5 mm or more must be chamfered at an angle of 35-40 ° to the end of the pipe. In this case, an end ring 1 - 3 mm wide should be left.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, the thread is applied to both ends of the pipe.

2.1; 2.2. (Modified edition, Amendments No. 3, 4).

2.3. At the request of the consumer, pipes are completed with couplings made according to GOST 8944-75, GOST 8954-75, GOST 8965-75 and GOST 8966-75 at the rate of one coupling for each pipe.

(Changed edition, Amendment No. 3).

2.4. Cracks, captivity, swelling and sunsets are not allowed on the pipe surface.

No delamination is allowed on pipe ends.

Separate dents, riabians, risks, traces of stripping, etc. are allowed

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