Rule 120-3-26-.21 - Safety/Safety Relief Valves(1) Minimum Relieving Capacity, Safety Valve, and/or Safety Relief Valves. TABLE 1
MINIMUM POUNDS OF STEAM PER HOUR PER SQUARE FOOT OF SURFACE
| Firetube Boilers | Watertube Boilers |
Boiler Heating Surface | | |
Hand Fired | 5 | 6 |
Stoker Fired | 7 | 8 |
Oil, Gas, or Pulverized Fuel Fired | 8 | 10 |
Waterwall Heating Surface | | |
Hand Fired | 8 | 8 |
Stoker Fired | 10 | 12 |
Oil, Gas, or Pulverized Fuel Fired | 14 | 16 |
(a) These numbers may not be adequate for boilers installed after 1976 or for boilers with updated fuel burning equipment. If in doubt, an accumulation test is recommended.(b) When a boiler is fired only by a gas giving a heat value not in excess of 200 BTU per cu. ft., the minimum safety valve or safety relief valve relieving capacity may be based in the value given for hand-fired boilers above.(2) The minimum relieving capacity of the valve or valves shall be governed by the capacity marking on the boiler vessel, or the minimum valve capacity in pounds per hour shall be the greater of that determined by dividing the maximum BTU output at the boiler nozzle obtained by the firing of any fuel determined on the basis of the pounds of steam generated per hour per square foot of boiler heating surface as given in Table 1. In many cases, a greater relieving capacity of valves will have to be provided than the minimum specified by these Rules. Example: BTU/hr = lbs/hr or lbs/hr x 1000 = BTU/hr 1000
(3) The minimum safety valve or safety relief valve relieving capacity for electric boilers shall be 3 - 1/2 pounds per hour per kilowatt input.(4) No person shall attempt to remove or do any work on any safety appliance prescribed by these Rules and Regulations while the appliance is subject to pressure, excluding setting or resetting of safety valves or safety relief valves.(5) Should any of those appliances be removed for repair during an outage of a boiler or pressure vessel, they shall be reinstalled and in proper working order before the object is again placed in service.(6) No person shall alter any safety or safety relief devices in any manner to maintain a working pressure in excess of that stated on the boiler or pressure vessel inspection certificate.(7) Alterations to, resetting, recalibration of, or repairs to safety or safety relief valves shall be made only by an organization which holds a valid certificate of authorization for use of the National Board "VR" stamp or by an owner user's maintenance organization, approved by the Chief Inspector which is limited to repairing of only those valves for its own use.Ga. Comp. R. & Regs. R. 120-3-26-.21
O.C.G.A. § 25-15-13.
Original Rule entitled "Exceptions. Amended" adopted. F. Mar. 16, 2015; eff. Apr. 5, 2015.Repealed: New Rule entitled "Safety/Safety Relief Valves" adopted. F. Dec. 31, 2020; eff. Jan. 20, 2021.