I. Pipe Fittings Standards
According to the specified standards, which fittings shall be in accordance with ASME B16.11?
Explanation: Forged steel SW and threaded fittings shall be in accordance with ASME B16.11.
II. Butt Welding Fittings
What standard should be followed for BW (Butt Welding) fittings?
Explanation: Dimensions of steel BW fittings not covered in ASME B16.9 shall conform to MSS-SP-48.
III. Usage of Unions
According to the specified standards, when is the usage of unions restricted?
Explanation: The usage of unions shall be restricted to utilities only.
IV. Elbow Selection
Which type of elbow (ASME B 16.9) should be used as the default?
Explanation: Long radius butt welding elbows (ASME B 16.9) should be used as the default.
V. Unions Usage Conditions
Under what conditions is the usage of unions limited, as defined in ASME B31.3?
Explanation: The usage of unions is limited to fluid service, which is non-flammable, nontoxic, and not damaging to human tissues as defined in ASME B31.3; then design temperature is below 186 °C; the design pressure is not higher than 150 psig.
VI. Forged Steel Fittings
Which standards should be followed for Forged steel SW and threaded fittings?
Explanation: Forged steel SW and threaded fittings shall be in accordance with ASME B16.11, unless otherwise specified. For items not covered under B16.11, reference may be made to BS 3799 or appropriate MSSSP Standard.
VII. Butt Welding Elbow Criteria
Under what circumstances shall short radius elbow be used?
Explanation: Short radius elbow shall only be used when specified on the drawings.
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