I. Socket Weld Fittings
When specifying piping classes with more than one class of socket weld fitting, what is the requirement for reducing fittings?
Explanation: Reducing fittings shall be specified to the higher rating if dictated by the outlet pipe size schedule.
II. Swaged Nipples
What standard provides dimensions for swage nipples, and what should the end conditions of swage nipples follow?
Explanation: Dimensions for swage nipples are provided in MSS SP-95, and end conditions should follow pipe class requirements and/or Purchaser’s standard.
III. Reduction in Size for Socket Weld/Threaded Connections
For pipe classes using socket weld/threaded connections, how should reduction in size be achieved?
Explanation: Reduction in size for socket weld/threaded connections shall be by swage nipple.
IV. Butt Weld and Small-Bore Socket Weld/Threaded Connections
For pipe classes with a combination of butt weld and small-bore socket weld/threaded connections, how should reductions be made?
Explanation: Reductions from butt weld to socket weld/threaded shall be made by swage nipple; the maximum size of the large end shall be NPS 4.
V. Butt Weld End Conditions
How should all other reductions within the butt weld end conditions be made?
Explanation: All other reductions within the butt weld end conditions shall be made by butt weld reducer type fitting.
VI. Seamless/Welded Execution
What should be the execution of fittings concerning seamless/welded in comparison to the pipe of the same size in the pipe class?
Explanation: Seamless/welded execution of fittings shall be the same as that of pipe of the same size in the pipe class.
VII. Material Certificates
What standard should material certificates for fittings comply with?
Explanation: Material certificates for fittings shall comply with BS EN10204, 3.1.
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