N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 4-5.4

Current through Register Vol. 46, No. 50, December 11, 2024

Section 4-5.4 - Installation and replacement of safety and relief valves for low pressure boilers

(a) Required. Such valves shall be installed or reinstalled and shall be in proper working order before the boiler is placed in service.

(b) Loading. No person shall in any manner load or excess of the maximum allowable stated on the certificate of inspection.

(c) Connection of safety valves. Safety valves shall be connected to boilers with the spindle vertical if possible, either directly to a tapped or flanged opening in the boiler, to a fitting connected to the boiler by a close nipple, to a Y-base, to a valveless steampipe between adjacent boilers, or to a valveless header connecting steam outlets on the same boiler.

(d) Connection of relief valves. Relief valves shall be connected to the top of boilers, with the spindle vertical if possible, either directly to a tapped or flanged opening in the boiler, to a fitting connected to the boiler by a close nipple, to a Y-base, to a valveless waterpipe between adjacent boilers, or to a valveless header connecting water outlets on the same boiler.

(e) Y-base. When a Y-base is used, the inlet area shall be not less than the combined outlet areas.

(f) Multiple valves. When the size of the boiler requires a safety valve or relief valve larger than 41/2-inch diameter, two or more valves having the required combined capacity shall be used. When two or more valves are used on a boiler they may be single, directly attached, or mounted on a Y-base.

(g) Shutoffs. No shutoff of any description shall be placed between the safety or relief valve and the boiler, nor on discharge pipes between such valves and the atmosphere.

(h) Internal pipes. Safety and relief valves shall not be connected to an internal pipe in the boiler.

(i) Discharge pipes. When a discharge pipe is used, its area shall be not less than the area of the valve or aggregate area based on the nominal diameters of the valves with which it connects, and the discharge pipe shall be fitted with an open drain to prevent water from lodging in the upper part of the valve or in the pipe. When an elbow is placed on a safety valve or a relief valve discharge pipe, it shall be located close to the valve outlet. The pipe shall be supported so that no undue stress is placed on the valve body.

(j) Scalding. The discharge from safety or relief valves shall be so arranged that there will be no danger of scalding persons or damaging equipment.

N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 4-5.4