20.C Boilers and Systems.
20.C.01 Provisions of the ASME "Boiler and Pressure Vessel Code" must apply in the construction, operation, maintenance, and inspection of steam boilers and pressure vessels.
Boiler Safety
20.C.02 Inspection.
- Inspections must be made to assure that all safety devices affecting operation of the firing equipment are installed in such a location that they cannot be isolated from the heat source by the closing of a valve.
- Boilers that have undergone major structural repairs or that have been relocated during the 12 calendar months for which certification has been made must be re-inspected and a new certificate posted before being put into operation.
20.C.03 When any boiler is being placed in service or restored to service after repairs to control circuits or safety devices, an operator must be in constant attendance until controls have functioned through several cycles or for a period of 24 hours whichever is greater. A report of the operating test must be provided to the GDA and include the following specific information: time, date, and duration of test; water pressure at boiler; boiler make, type, and serial number; design pressure and rated capacity; gas pressure at burner; flue gas temperature at boiler outlet; and the surface temperature of the boiler jacket. All indicating instruments must be read and recorded at half-hour intervals.
20.C.04 Fusible plugs must be provided on all boilers, other than those of the water tube type.
- Replacement of fusible plugs must coincide with the inspections recommended by the ASME Boiler and Pressure Vessel Code.
- When necessary to replace fusible plugs between inspections, a written report covering the circumstances and providing make and heat number of plugs removed and inserted must be forwarded to the responsible boiler inspector.
20.C.05 All boilers must be equipped with water columns, gauge glass, and try cocks approved by a nationally-recognized testing laboratory.
- Gauge glasses and water columns must be guarded.
- When shutoffs are used on the connections to a water column, they must be of an approved locking or sealing type.
20.C.06 All boilers must be equipped with blowoff cocks or valves approved by a nationally-recognized testing laboratory. The blowoff line must be arranged so that leakage can be observed by the operator.
Knowledge Check Choose the best answer for the question.
20-5. How long must an operator be in constant attendance when a boiler is being placed in service or restored to service after repairs to control circuits or safety devices?
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