Can PN32 and PN22 welded high-pressure tees be fabricated on-site?
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Can welded high-pressure tees made of PN32 and PN22 for ammonia synthesis be fabricated on-site, and what are the precautions for such fabrication?
Welded high-pressure tees made of PN32 and PN22 materials for ammonia synthesis can be fabricated on-site. The following precautions should be observed during fabrication: 1. Select the appropriate welding electrodes and dry them in accordance with the specified requirements. 2. Welders must possess the appropriate qualifications, and pass lead tests as well as welding procedure qualification. 3. The welding environment, such as humidity, temperature, and wind speed, must meet the specified requirements. 4. The openings, grooves, butt joints, gaps, etc. meet the specification requirements. 5. TIG welding for root pass. 6. Pay attention to welding quality, such as layering, welding sequence, and finishing. 7. Timely grinding and removal of welding defects. 8. Preheating before welding and heat treatment after welding.
The answer on the 2nd floor was excellent; preheating before welding and the welding process are very important
Reply to 2# lhy: Are there any standard components available for the PN32 three-way valve used in ammonia synthesis? Is GB12459 not applicable in this case?