Jan 07, 2009 · ASME. requires a gauge with a scale of twice the boiler's rated pressure. For low pressure steam, this is 15 PSIG maximum so a 0-30 PSIG gauge is used, sometimes a compound gauge -30"Hg to +30 PSIG. There is nothing in the ASME boiler code that says such gauges must be useful
The pressure control switch on a steam heating boiler is designed to shut the heating system down should unsafe high pressures develop. As we emphasize at our description of pressure gaugesOn a steam boiler, residential steam heating systems are almost always designed to operate at very low pressures, perhaps around .5 psi - that' s 1/2 of one psi.
If steam setpoint is 80 PSI, then modulation control should be set to 80 PSI, operator control to 88 PSI and the high limit control to 98 PSI with the safety valve setpoint at 150 PSI. These three basic controls are what you will find on almost every boiler.
Steam Heating System Controls & Gauges: Photo Guide Repair steam boiler …
Guidance on Safe Operation of Steam Boilers
BOILER - A closed vessel in which water or other liquid is heated, steam or vapor is generated, steam or vapor is superheated, or any combination thereof, under pressure or vacuum, for use external to itself, by the direct application of energy from combustion of fuels, electricity or solar energy.
Every steam boiler shall have a water-gauge glass and a pressure gauge. The pressure gauge shall indicate the pressure within the normal range of the system's operation. 1010.2.1 Water-Gauge Glass The gauge glass shall be installed so that the midpoint is at the normal boiler water level.
FEDERAL SUBSIDIARY LEGISLATION FACTORIES AND MACHINERY AC…
Regulation 54. Pressure gauge. Regulation 55. Nameplates. Regulation 56. Drain valves. Regulation 57. Stop valves. Regulation 58. Pressure reducing valves. Regulation 59. Snifting valve. Regulation 60. Installation. Regulation 61. Supports. Regulation 62. Working test. Regulation 63. Discharge of contents. Regulation 64. Cubic capacity.