OSHA General Industry Standards (29 CFR Part 1910) 1910.158: 1910.158 Standpipe and hose systems

Applies to small hose, Class II and Class III standpipe systems installed to meet a particular OSHA standard; Class I standpipe systems are excluded. Standpipes must be located or protected against mechanical damage and repaired promptly when damaged. Reels and cabinets must allow prompt use of valves, hose and equipment, be conspicuously identified and be used only for fire equipment. Hose outlets and connections must be high enough above the floor to avoid obstruction and be accessible, with standardized screw threads or adapters compatible with supporting fire equipment. Every outlet of 1 1/2 inch (3.8 cm) or smaller must have hose connected and ready, except that in extremely cold climates hose may be stored nearby if readily available. Systems installed after January 1, 1981 for employee use must have lined hose; unlined hose on existing systems that becomes unserviceable must be replaced with lined hose. Hose length must keep nozzle pressure at no less than 30 psi (210 kPa), with dynamic nozzle pressure between 30 psi and 125 psi (860 kPa), and hose must have shut-off type nozzles. Water supply must provide 100 gallons per minute (6.3 l/s) for at least thirty minutes. Acceptance tests for systems installed after January 1, 1981: Class II and III piping, including yard piping, hydrostatically tested for at least 2 hours at not less than 200 psi (1380 kPa), or 50 psi above normal pressure where normal pressure exceeds 150 psi; hose tested with couplings in place at not less than 200 psi, held for at least 15 seconds and no more than one minute without leaks or jacket thread breaks. Maintenance: supply tanks kept filled and pressure tanks at proper pressure except during repairs; main supply valves kept fully open; hose systems inspected at least annually and after each use; any unserviceable portion removed from service immediately and replaced with equivalent protection such as extinguishers and fire watches; hemp or linen hose on existing systems unracked, inspected and reracked with a different fold pattern at least annually; and trained persons designated for all inspections. Non-mandatory Appendix A to Subpart L notes that systems designed and installed to NFPA 14 are considered compliant.