1.1 This standard specifies the dimension, tolerance, technical requirements, inspection, test, mark and package of butt welding seamless pipe fittings ( including elbows, reducing pipes, Three Direct Links and pipe caps) manufactured of carbon steel, alloy steel and austenitic stainless steel.
1.2 This standard is applicable to Steel Butt-welding Seamless Pipe Fittings manufactured by steel with nominal diameter DN 15 ~ 600 for pipelines of petrochemical enterprises.
1 Subject Contents And Application Scope 1
2. Normative References 2
3 Pipe Fitting Types Dimension Series 3
4 Dimensional Tolerance 10
5 Permissible Pressure Value 12
6 Designation and Standard of Common Pipe Fittings 14
7 Manufacturing and Thermal Treatment 16
8 Inspection and Test 19
9 Product Quality Certificate 21
10 Painting, Mark and Package 22
Appendix A Wall Thickness Grading of Seamless Steel Pipes 23
Additonal Explanation: 25
