1. Pipe Dimensions
Which standard should be followed for the dimensions of wrought steel pipes?
Explanation: Wrought steel pipes should follow the dimensions specified in ASME B36.10.
2. Pipe Manufacturing Process
Which manufacturing process for steel pipe is not acceptable?
Explanation: Steel pipes made by the Acid-Bessemer process are not acceptable; they should be made by open hearth, electric furnace, or basic oxygen process.
3. Pipe Threads
Which standard should all pipe threads conform to?
Explanation: All pipe threads should conform to ASME B1.20.1.
4. Non-Standard Pipe Sizes
How are non-standard pipe sizes (1¼”, 2½”, 3½”, 5″, and 22″) treated in the specification?
Explanation: Non-standard pipe sizes are not treated as part of the specification unless separately called out.
5. Threaded Joints
Are threaded joints allowed in process piping?
Explanation: Threaded joints are not allowed in process piping. Threaded instrument connections are allowed only downstream of a piping block valve.
6. Full Vacuum Service
What is required for pipe wall thickness in services calling for full vacuum?
Explanation: The pipe wall thickness shall be sufficient for the design conditions in services calling for full vacuum.
7. Minimum Pipe Size for Process Line
What is the minimum pipe size for a process line?
Explanation: The minimum pipe size for a process line is NPS ¾.
8. Minimum Schedule for Small Bore Piping
What is the minimum schedule for Small Bore Piping (2” and below) for Carbon steel and Alloy steel?
Explanation: For Small Bore Piping (2” and below) for Carbon steel and Alloy steel, the minimum schedule shall be XS.
9. Minimum Schedule for Large Bore Piping (Stainless steel)
What is the minimum schedule for Large Bore Piping (3” and above) for Stainless steel?
Explanation: For Large Bore Piping (3” and above) for Stainless steel, the minimum schedule shall be SCH.10S.
10. Construction of Pipes
Which pipes shall be of seamless construction?
Explanation: Pipes ≤ NPS 16 for Carbon Steel, Impact Tested Carbon Steel, Alloy Steel (Cr-Mo), and Stainless Steel & Ni Alloy pipes ≤ NPS 6 shall be of seamless construction unless specified otherwise.
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