Spiral welded pipe: It is made by rolling a low carbon carbon structural steel or a low alloy structural steel strip into a tube blank at a certain angle of a helix (called a forming angle), and then welding the pipe joint to make it narrower. Strip steel produces large diameter steel pipes. Spiral welded pipe is mainly used for oil and natural gas transmission pipelines, and its specifications are expressed by outer diameter * wall thickness. Spiral welded pipes are single-sided welded and double-sided welded. The welded pipe shall ensure that the hydraulic test and the tensile strength and cold bending performance of the weld are in compliance with the regulations.
Spiral welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of the spiral welded pipe is generally higher than that of the straight welded pipe. It is possible to produce a welded pipe with a large diameter by using a narrow blank, and it is also possible to produce a welded pipe having a different pipe diameter by using a blank of the same width.
First, the application of spiral welded pipe
Suitable for ordinary low-pressure fluid pipelines such as water, sewage, air, heating, steam and flammable fluids. For example: hydropower stations, power plants, water companies, fire and air conditioning pipeline installation, billboard production, gas, gas transmission, steel structure plant construction and other similar fluid transport steel pipes.
Second, spiral welded pipe commonly used specifications meter and pressure gauge
Specifications / mm
(r × d) meter weight Kg / m water pressure MPA specifications / mm
(r × d) meter weight Kg / m water pressure MPA
Φ219×632.027.7Φ630×692.832.7
Φ219×737.109.0Φ630×7108.053.1
Φ219×842.1310.3Φ630×8123.223.6
Φ273×640.016.2Φ630×9138.334.0
Φ273×746.427.2Φ630×10153.404.5
Φ273×852.788.3Φ630×12183.395.4
Φ325×647.705.2Φ720×6106.152.4
Φ325×755.396.1Φ720×7123.592.7
Φ325×863.046.9Φ720×8140.973.1
Φ377×655.394.5Φ720×9158.313.5
Φ377×764.375.2Φ720×10175.603.9
Φ377×873.306.0Φ720×12210.024.7
Φ377×982.186.7Φ820×7140.852.4
Φ377×1091.017.5Φ820×8160.702.8
Φ426×662.654.0Φ820×9180.503.1
Φ426×772.834.6Φ820×10200.263.4
Φ426×882.975.3Φ820×12239.624.1
Φ426×993.056.0Φ920×8180.432.5
Φ426×10103.096.6Φ920×9202.702.8
Φ478×670.343.5Φ920×10224.923.1
Φ478×781.814.1Φ920×12269.213.7
Φ478×893.234.7Φ1020×8200.162.2
Φ478×9104.605.3Φ1020×9224.892.5
Φ478×10115.925.9Φ1020×10249.582.8
Φ478×12138.417.1Φ1020×12298.813.3
Φ529×677.893.2Φ1220×10298.92.3
Φ529×790.613.7Φ1220×12357.992.8
Φ529×8103.294.3Φ1220×14416.883.2
Φ529×9115.924.8Φ1420×10348.232.0
Φ529×10128.495.3Φ1420×12417.182.4
Φ529×12153.506.4Φ1420×14485.942.8
Third, spiral welded pipe main quality indicators comparison table
Project standard code
SY/T5037-2000GB/T9711.1-1997 (Grade A) API Spec 5L (42)
Scope of application: gas, water, gas, air, heating,
Steel pipe for ordinary fluid transportation pipes such as steam, oil and gas for industrial transportation, steel pipe for oil and gas industry transportation
Steel type Q195, Q215, Q235L175——L483A, B, X42——X70
Dimensional tube outer diameter D<508 ±0.75%D
D≥508 ±1.00% DD<508±0.75%D
D≥508±1.00% DD<508±0.75%D
508≥D≥914-0.25%D-+0.75%D
D>914-3.20-+6.35
Tube end outer diameter D<508 ±0.75%D±2.5 take small value
D≥508 ±1.00%D±4.5 Take the small value D≤273.1-0.40-+1.59
D>323.9-0.79-+2.38D≤273.1-0.40-+1.59
D>273.1-0.79-+2.38
Deviation wall thickness D<508±12.5%t-12.5%t-+15.0%t-12.5%t-+15.0%t
D≥508±10.0%tL175-L245-10.0%t-+17.5%t is not higher than B grade-12.5%t-+17.5%t
L290-L555-8.0%t-+19.5%t is not lower than X42-8.0%t -+19.5%t
The maximum outer diameter of the steel pipe with ±1% DD>508 in the range of elliptical pipe end 100 shall not be larger than the nominal outer diameter by 1% from the pipe end 101.6; the minimum outer diameter shall not be less than the nominal outer diameter by 1% D>508 The maximum outer diameter within 101.6 from the end of the tube shall not be 1% larger than the nominal outer diameter; the minimum outer diameter shall not be 1% smaller than the nominal outer diameter.
The degree of curvature (straightness) shall not exceed 0.2% of the total length of the steel pipe and shall not exceed 0.2% of the total length of the steel pipe and shall not exceed 0.2% of the total length of the steel pipe.
Pipe end bevel angle 30 ° - 35 °
Blunt edge 1.6±0.8 groove angle 30°--35°
Blunt edge 1.59±0.79 groove angle 30°--35° blunt edge 1.59±0.79
Cut oblique D<813, ≤1.6
D≥813, ≤3.0<1.59<1.59
The wrong side t≤12.70.35t and not more than 3.0≤1.59≤1.59
t>12.70.25t0.1251 and 3.18 take the minimum value of 0.1251 and 3.18
Weld seam height t≤13<3.2
t>13<4.8t≤12.7<3.18
t>12.7<4.76t≤12.7...<3.18
t>12.7 <4.76
Chemical analysis, 1 sample per smelting batch, 2 samples per smelting batch, 2 samples per smelting batch
Tensile specimens: One welded joint sample base material per inspection batch: 1 sample per smelting batch
Spiral weld: 1 sample per smelting
Butt weld: no more than 50 take one sample base material: 1 sample per smelting batch
Spiral weld: 1 sample per smelting
Butt weld: no more than 50 take one sample
The guide bending test does not take one positive bend specimen and one reverse bend specimen for each inspection. No more than 50 for the head weld, one positive bend specimen and one reverse bend specimen. One positive bend specimen per inspection batch. And a reverse bend specimen, no more than 50 pairs of head welds, one positive bend specimen and one reverse bend specimen
When the fracture toughness test is not required by the contract, the Charpy impact is 3 per smelting;
When D≥508, when the drop hammer impacts 2 smelting requirements for each smelting, the Charpy impact is 3 for each smelting;
When D≥508, the drop hammer impact is 2 per smelting batch.
Non-destructive testing repair welding seams, head welds, hoop welds shall be subjected to X-ray or ultrasonic inspection; spiral welds shall be checked for 20% of steel pipes, and spiral welds for flammable gas delivery pipes shall be 100% inspected by 100X inspection or 100% ultrasonic testing, plus butt weld, T-weld and tube end 203mm X-ray inspection 100X inspection or 100% ultrasonic inspection, plus butt weld, T-weld and tube end 203mm X-ray inspection
D: nominal outer diameter of steel pipe, mm t: nominal wall thickness of steel pipe, test stress of mm [σ] hydrostatic test, Mpa;
L: length of single steel pipe P: hydrostatic pressure test pressure, Pa
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