La. Admin. Code tit. 55 § V-5026

Current through Register Vol. 50, No. 11, November 20, 2024

Section V-5026 - Boiler Feeding

A. Each boiler shall have a feed supply which will permit it to be fed at any time while under pressure.

B. A boiler having more than 500 square feet of water heating surface shall have at least two suitable means of feeding, at least one of which shall be a feed pump. A source of feed at a pressure 6 percent greater than the set pressure of the safety valve with the highest setting maybe considered one of the means. Boilers fired by gaseous, liquid, or solid fuel in suspension may be equipped with a single means of feeding water provided means are furnished for the shutoff of heat input prior to the water level reaching the lowest safe level.

C. The feed water shall be introduced into a boiler in such a manner that the water will not be discharged directly against surfaces exposed to gases of high temperature to direct radiation from the fire. For pressures of 400 psig over, the feed water inlet through the drum shall be fitted with shields, sleeves, or other suitable means to reduce the effects of temperature differentials in the shell or head.

D. The feed piping to the boiler shall be provided with a check valve near the boiler and a valve or cock between the check valve and the boiler. When two or more boilers are fed from a common source, there shall also be a valve on the branch to each boiler between the check valve and the source of supply. Whenever a globe valve is used on feed piping, the inlet shall be under the disk of the valve.

E. In all cases where returns are fed back to the boiler by gravity, there shall be a check valve and stop valve in each return line, the stop valve to be place between the boiler and the check valve, and both shall be located as close to the boiler as practicable. It is recommended that no stop valves be placed in the supply and return pipe connections of a single boiler installation.

F. Where deaerating heaters are not employed, it is recommended that the temperature of the feed water be not less than 120° F to avoid the possibility of setting up localized stress. Where deaerating heaters are employed, it is recommended that the minimum feed water temperature be not less than 215° F so that dissolved gases may be thoroughly released.

La. Admin. Code tit. 55, § V-5026

Promulgated by the Department of Public Safety, Office of the State Fire Marshal, LR 33:1357 (July 2007).

AUTHORITY NOTE: Promulgated in accordance with R.S. 23:531 and R.S. 51:1424.