Nevada Administrative Code
Chapter 455C - Boilers, Elevators and Pressure Vessels
BOILERS AND PRESSURE VESSELS
Boilers
Section 455C.258 - Feed water connections

1. Feed water, make-up water or water treatment must be introduced into a boiler through the return piping system or through an independent feed water connection which does not discharge against the parts of the boiler exposed to direct radiant heat from the fire. Feed water, make-up water or water treatment must not be introduced through openings or connections provided for inspection or cleaning, a safety valve, safety relief valve, surface blowoff, water column, water gauge glass, pressure gauge or temperature gauge.

2. The feed water pipe must be provided with a check valve near the boiler and a stop valve or cock between the check valve and the boiler or return pipe system.