(a)

1. (1) The feedwater 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 or to direct radiation from the fire, or close to any riveted joints of the furnace sheets or of the shell.
2. (2) For pressures of four hundred pounds (400 lbs.), or over, the feedwater 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.
3. (3) If necessary, the discharge end of a feed pipe shall be fitted with a baffle to divert the flow from the riveted joint.
4. (4) Feedwater, other than condensate returned as provided for in 20 CAR § 880-1007 shall not be introduced through the blowoff.

(b)

1. (1) When the horizontal-return tubular boiler exceeds forty inches (40”) in diameter, the feedwater shall discharge at about three-fifths (3/5) the length from that end of the boiler which is subjected to the hottest gases of the furnace (except a horizontal-return tubular boiler equipped with an auxiliary feedwater heating and circulating device), above the central rows of tubes.
2. (2) The feed pipe shall be carried through the head or shall farthest from the point of discharge of the feedwater in the manner specified for a surface blowoff in the ASME code, as adopted, and be securely fastened inside the shall above the tubes.

(c)

1. (1) In vertical tubular boilers having tubes four feet (4’) or less in length, the feedwater shall be introduced at a point not less than one-fourth (1/4) the length of the tube above the lower tube sheet.
2. (2) For tubes more than four feet (4’) in length, the feedwater shall be introduced at a point not less than twelve inches (12”) above the crown sheet.

3. (3) When the boiler is under pressure, feedwater shall not be introduced through the openings or connections used for the:

   1. (A) Water column;
   2. (B) Water gauge glass;
   3. (C) Blowoff; or
   4. (D) Gauge cocks.
4. (4) In closed systems, the water may be introduced through any opening when the boiler is not under pressure.