Pressurized fluid conveying with spiral seam submerged arc welding pipe

Pressurized fluid conveying with spiral seam submerged arc welded steel pipe is mainly used for conveying oil, natural gas pipeline; Pressurized fluid conveying with high frequency welding spiral seam steel pipe), using high-frequency welded lap welding method, used in pressurized fluid conveying spiral seam high frequency welding steel pipe. Steel tube confined ability, good plasticity, easy to welding and processing molding; General low-pressure fluid conveying spiral seam submerged arc welding steel pipe, use double-sided automatic submerged arc welding or welding by one side into the legal system for water, gas, air and steam general low-pressure fluid conveying with submerged arc welding steel pipe Now commonly used standard spiral welded steel pipe, API 5 l (American petroleum institute, also known as the pipeline steel pipe, which is divided into PSL1 and PSL2 two level)

Pressurized fluid conveying with spiral tube bending process performance 1) performance As stipulated in the table below the bend heart after bending diameter 180 degrees, reinforced by bending parts surface shall not crack. 2) reverse bending performance According to the buyer's request, reinforced can reverse bending performance test. Reverse bending test of curved heart than bending test diameter increase, a steel bar diameter. Positively curved 45 degree first, and then reverse bending 23 degrees, reverse bending after 23 degrees. After reverse bend test, reinforced by bending parts surface shall not crack. 4. The surface quality: steel surface permits can not have crack, scarring, and folding. Steel on the surface of the convex block is allowed, but must not exceed the height of the horizontal rib, reinforced depth and other defects on the surface height shall not be greater than their positions to allow the size deviation. 5. Size, shape, weight, and allowable deviation: 1) nominal diameter range and recommended diameter steel bar nominal diameter in the range of 6 ~ 25 mm, steel standards recommended by the nominal diameter is 6, 8, 10, 12, 16, 20, 25, 32, 40, 50 mm. 2) ribbed steel plate surface shape and size of allowable deviation Ribbed reinforced cross rib shall meet the following basic requirements: cross rib with steel plate axis of beta should not be less than 45 degree Angle, when the Angle is not greater than 70 degrees, reinforcement relative to the direction of the horizontal rib on both sides should instead; L cross rib and spacing shall not be greater than 0.7 times the diameter of the steel bar nominal; Horizontal rib on the side and Angle on the surface of the steel shall not be less than 45 degrees; Gap between reinforcement relative to the end of cross rib on both sides (including the longitudinal rib width) 20% of the combined steel should not be greater than nominal circumference; When the steel bar nominal diameter is not more than 12 mm, relative costal area should not be less than 0.055;  nominal diameter is 14 mm and 16 mm, relative costal area should not be less than 0.060; Nominal diameter greater than 16 mm, relative costal area should not be less than 0.065. 3) length and allowable deviation, length: a reinforced usually according to the specified length delivery, specific delivery length should be indicated in the contract;  structural steel pipe to delivery, each dish should be a steel bar, allow 5% per batch  plate number (less than two sets can have two sets) consists of two steel. Its diameter disc weight and plate shall be formulated by the supply and demand both sides talks things over. B, the length of the allowable deviation, reinforced by the length of delivery when the length of the allowable deviation shall not be greater than + 50 mm. C, bending and end: straight steel bar bending change should not affect the normal use, the total curvature is not more than 40% of the total length of reinforcement; Reinforced ends should be cut integrity, local deformation shall not influence the use.