The significance of the V-shaped groove of spiral welded steel pipes is to facilitate the installation unit to implement welding. There will be no lack of penetration or lack of fusion when welding spiral welded steel pipe with V-shaped grooves.
The execution table of spiral welded steel pipe clearly stipulates that the angle of the groove and blunt edge is not 30-35°, and grooves with different angles can also be processed according to user requirements.
Dimensions, shapes, weights, technical requirements, experimental methods, inspection rules, packaging, markings and quality certificates of welded steel pipes for low-pressure fluid transportation. This standard applies to straight seam electric welded steel pipes, straight seam submerged arc welded (SAWL) steel pipes and spiral seam submerged arc welded (SAWH) steel pipes for low-pressure fluids such as water, air, heating steam and gas.
ASTM standard steel pipe ordering contracts or orders should at least include the following: a) standard number; b) product name; c) steel grade (quality grade); d) order quantity (total weight or total length); e) size specifications ;f) Length; g) Manufacturing process; h) Zinc layer weight requirements (when used); i) Other requirements.
The allowable deviation of the outer diameter and wall thickness of the steel pipe should comply with the regulations, which are stipulated as follows. Now we will introduce the commonly used specifications: the outer diameter of the steel pipe is 237.1-508mm, and the allowable deviation range of the outer diameter of the steel pipe end is 0.8-2.4mm; For steel pipes with an outer diameter of 508mm or more, the allowable deviation range of the steel pipe end outer diameter is 0.8-3.2mm. The allowable deviation of wall thickness is stipulated that regardless of the outer diameter of the steel pipe, the allowable deviation of the wall thickness of the steel pipe is plus or minus ten percent of the wall thickness of the steel pipe.
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