tailieunhanh - ARNOLD, K. (1999). Design of Gas-Handling Systems and Facilities (2nd ed.) Episode 2 Part 5

Tham khảo tài liệu 'arnold, k. (1999). design of gas-handling systems and facilities (2nd ed.) episode 2 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Table 12-4 u Maximum Allowable Joint Efficiencies for Arc and Gas Welded Joints a No. Type erf Joint Description Limitations a Fully Radiographed1 b Spot Examined c Not Spot Examined3 I Butt joints as attained by doublewelding or by other means that will obtain the same quality of deposited weld metal on the inside and outside weld surfaces to agree with the requirements of UW-35. Welds using metal backing strips that remain in the place are excluded. None 2 Single-welded butt joint with backing strip other than those included under 1 . a None except as in b below b Butt weld with one plate offset for circumferential joints only see UW-13 c and Fig. k 3 Single-welded butt joint without use of backing strip Circumferential joints only not over -inch thick and not over 24-in. outside diameter. 4 Double full fillet lap joint. Longitudinal joints not over zi-in. thick. Circumferential joints not over Á-in. thick. liable continued an next pìUỊt Design of Gas-Handling Systems and Facilities 5 Single full lì I let lap joints with plug welds conforming to UW-17. a Circumferential joints4 for attachment of heads not over 24-in. outside diameter to shells not over l in. thick. b Circumferential joints for the attachment to shells of jackets not over in. in nominal thickness where the distance from the center of the plug weld to the edge of the plate is not less than 1 lÁ times the diamter of the hole for the plug. 6 Single full fillet lap joints with- out plug welds. a For the attachment of heads convex to pressure to shells not over 5i-in. required thickness only with use of fillet weld on inside of shell or b For attachment of heads having pressure on either side to shells not over 24-in. inside diameter and not over Á-in. required thickness with fillet weld on outside of head flange only. See UW-l2 a and ITW-51. 2SeeUW 12 b and UW-52 Thc maximum allowable joint efficiencies shown in this column arc the weld joint .