Petro-chemical Equipment Technology ›› 2019, Vol. 40 ›› Issue (6): 28-34.doi: 10.3969/j.issn.1006-8805.2019.06.008

• MATERIAL AND WELDING • Previous Articles     Next Articles

Causes of Weld Defects in Key Towers of High Sulfur Natural Gas Purification and Repair Technology

Qu Danlong   

  1. Oilfield Exploration and Development Division, China Petroleum & Chemical Corporation, Beijing, 100728
  • Received:2019-08-02 Accepted:2019-10-25 Online:2019-11-20 Published:2019-11-20

Abstract: The primary absorber of a gas field purification plant in China is a high-pressure and high-sulfur clad steel thick-wall tower. It is the key equipment. In recent years, it has been found that the buried defects of some tower shell welds exceeded the standard, and there was major risk of hydrogen sulfide leakage caused by crack growth and cracking. Through accurate detection, defect cause analysis, defect repair and research on the key technologies involving bulk heat treatment after repair and safety assessment of the high-pressure and high-sulfur clad steel thick-wall tower, this paper provides guarantee for the safe, stable and long-term operation of the purification plant.

Key words: purification plant, main absorption tower, buried defect detection, defect cause analysis, defect repair, bulk heat treatment, safety evaluation