It is made by rolling low-carbon carbon structural steel or low-alloy structural steel strip according to a certain spiral angle (called forming angle) into a tube blank, and then welding the tube seam together. It can be made with a narrower Strip steel produces large diameter steel pipes. Its specifications are expressed by outer diameter * wall thickness, and the welded pipe shall be ensured that the hydraulic test, the tensile strength of the weld and the cold bending performance must meet the requirements.
| Production | Spiral Welded Steel Pipe |
| Brand | Longford |
| Standard | API 5L, API 5CT, SY/T5037, SY/T5040, GB/T9711.1,GB/T9711.2, A, B, X42-X80, L175-L555,L245NB, etc. |
| Material | 1.0033，08F，A53，A106，Q235，Q345b， |
| Out Diameter | 159mm-3200mm |
| Wall Thickness | 3mm-30mm |
| Length | 5.8m-11.8m,or as customer's requirements. |
| Place of Origin | Tianjin, China |
| Main Market | Middle East,Africa,South-east Asia,USA,Canada,South America |
| Technique | SAW, ERW welyading etc. |
| Usage | 1. Piling project 2. Heat-supply project 3. Conveying drinking water,drainage,coal gas,fuel gas,mine slurry and other low & middle pressure fluids 4. API5L Petroleum and natural gas pipeline 5. Chemistry industry 6.Electric power engineering circulating pipe |
| Package | 1.Bundle packing or in bulk 2. Bevelled or plain ends as per buyer's request 3. Marks: as per customer's request 4. Surface treatment: with or without varnish/2PP/2PE/3PE/3PP/FBE coating 5. Metal or plastic protecting caps at pipe ends |
| Delivery Time | about 20days after receipt of irrevocable L/C at sight or 30% deposit T/T |
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Other products | 1.Spiral welded steel pipe 2.LSAW steel pipe 3.ERW steel pipe 4. Casing pipe |
| External Coating | FBE, 2PE, 3PE,3PP etc. |
| Pipe end | Plain end, beveled end, PVC covered and both ends capped ,threaded and coupled |
(1) Steel pipes of different diameters can be produced using strip steel of the same width, and steel pipes of large diameter can be produced from narrow strip steel. (2) Under the same pressure conditions, the stress of the spiral welded seam is smaller than that of the straight seam, which is 75% to 90% of that of the straight seam welded pipe, so it can withstand greater pressure. Compared with the straight seam welded pipe of the same outer diameter, the wall thickness can be reduced by 10% to 25% under the same pressure. (3) The size is accurate, the general diameter tolerance does not exceed 0.12%, the deflection is less than 1/2000, and the ovality is less than 1%. Generally, the sizing and straightening process can be omitted. (4) Continuous production is possible. In theory, long steel pipes can be produced, with small head and tail loss, and can increase the metal utilization rate by 6% to 8%. (5) The equipment is light in weight and low initial investment. It can be made into a trailer-type mobile unit to directly produce welded pipes at the construction site where the pipeline is laid. The production of spiral welded steel pipes can reflect the advantages of high quality and high efficiency. The production capacity of one spiral welded pipe unit is equivalent to 5-8 sets of straight seam welded pipe equipment. How to make multiple pipe coiling equipment production lines meet the same production standard, that is, produce according to a unified production process specification and quality assurance system to meet welding quality Requirements and piping manufacturing grades will be an arduous task.