Which standard governs gray iron threaded fittings?

Which standard governs gray iron threaded fittings?

• A. ASME B16.4
• B. Gauge Pressure
• C. Nonmetallic Pipe
• D. Light Hazard Occupancies

Answer: (A)

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.