Which standard governs gray iron threaded fittings?

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Prepare for the NFPA 13R: Sprinkler Systems for Low-Rise Residences Test. Utilize flashcards, multiple choice questions, and detailed explanations to excel. Ace your exam with confidence!

Multiple Choice

Which standard governs gray iron threaded fittings?

Explanation:
Gray iron threaded fittings are governed by ASME B16.4, which specifies the dimensions, thread forms, and pressure ratings for gray iron and ductile iron threaded fittings. In NFPA 13R residential sprinkler systems, using fittings that conform to this standard ensures proper thread compatibility and safe pressure performance, which is essential for reliable system operation. The other options aren’t standards for fittings: gauge pressure is a measurement, nonmetallic pipe is a material category, and light hazard occupancies is a fire-risk classification, not a fittings standard.

Gray iron threaded fittings are governed by ASME B16.4, which specifies the dimensions, thread forms, and pressure ratings for gray iron and ductile iron threaded fittings. In NFPA 13R residential sprinkler systems, using fittings that conform to this standard ensures proper thread compatibility and safe pressure performance, which is essential for reliable system operation. The other options aren’t standards for fittings: gauge pressure is a measurement, nonmetallic pipe is a material category, and light hazard occupancies is a fire-risk classification, not a fittings standard.

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