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While inspecting low-pressure or high-pressure boilers, the inspector will be observing operating controls.
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Some jurisdictional authorities require the high-limit control be equipped with a manual reset. Jumper wires could be used inappropriately in an attempt to permanently bypass a control which has malfunctioned and will not allow the boiler to operate. Jumper wires can be used legitimately by qualified service personnel during maintenance and testing, but must be removed before returning the boiler to normal operation. Either type of operating control can be bypassed electrically with jumper wires. Temperature controls are designed and manufactured in different configurations to sense temperature on the surface of a pipe (sometimes called a surface mount device), in a thermo-well, or directly in the water. #Minecraft psi iron cad assembly code#
A temperature control must be installed as required by the ASME BPV Code and the manufacturer's instructions. If the siphon loop is installed in the incorrect orientation shown in Figure 1, movement of the loop caused by heat and/or pressure can cause the mercury switch in the device to activate or deactivate at other than the set pressure. When a siphon or pigtail is used to prevent live steam from entering and damaging the device, the orientation of the siphon loop is critical to the proper operation of a device containing a mercury switch. The ASME BPV Code requirements and device manufacturer's instructions should be followed for any installation details. A pressure control must be installed so as to always sense pressure from the steam space of the boiler. Jurisdictional regulations will specify the use of ASME Standard CSD-1 if it is mandated.Īll operating controls must operate as designed in order to perform their required tasks. In addition, ASME Standard CSD-1 (if applicable) requires the controls on boilers with input ratings up to 12,500,000 Btu/hr. The operator should then look for the problem which caused the high-limit control to activate before resetting the device and restarting the boiler.ĪSME BPV Code Section I does not specifically mandate pressure or temperature controls but they will be found, in one form or another, on almost all ASME BPV Code Section I boilers. The purpose of this is to alert the operator that the high-limit control has been activated. Some high-limit controls incorporate a manual reset. However, if the primary, or operating, control should fail, the high-limit control must operate, stopping the burner or other source of heat. 
The secondary device referenced above for both steam and hot-water boilers is referred to as a high-limit control and under normal conditions, would never be called upon to operate. A second device is used to prevent the boiler from exceeding the design temperature of an ASME BPV Code Section I boiler or the maximum water temperature indicated on an ASME BPV Code Section IV boiler nameplate. Hot-water boilers require a device which senses water temperature and cycles the burner or other source of heat in order to maintain a consistent, predetermined operating temperature. A second device is used to prevent the boiler from exceeding the maximum allowable working pressure (MAWP) indicated on the boiler nameplate. Steam boilers require a device which senses steam pressure and cycles the burner or other source of heat in order to maintain a consistent, predetermined operating pressure. Operating controls for boilers could be broadly defined to include burner management controls however, this inspector guide will be limited to the pressure and temperature operating controls required by the ASME BPV Code for steam and hot water boilers.
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