The pressure relief valve on a hot water boiler:
a. Should be installed on the boiler or close to it
b. Can be installed anywhere in the system
c. Must be at least 51 mm pipe size
d. Does not require annual checking or testing
e. Can be installed with an isolation valve
Answer: A
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Power Engineering Chapter 94
- During warm-up of a cold hot water boiler excessive pressure build-up is prevented by
- A hot water boiler is protected from over pressure by means of
- The expansion and contraction rod type of temperature relief device will open the valve at __________ degrees Celsius and close it at __________ degrees Celsius.
- With the fusible plug type of temperature relief device, the fusible plug will melt at __________ degrees Celsius and allow hot water to escape.
- Hot water heating boilers must be equipped with a
- When the pressure pointer of a closed system reads lower than the altitude pointer the
- The dial of a pressure gauge on a hot water boiler indicating SI units can be graduated in
- The lever handle of the shut-off cock between a pressure or altitude gauge and a hot water boiler should be __________ to the pipe in which it is located when the cock is open.
- Siphon is not required between a pressure or an altitude gauge and a hot water boiler since these boilers are
- When a closed expansion tank is used and the system is cold
- An altitude gauge on a hot water heating boiler is used to indicate:
- The entrained air in a hot water heating system is directed to the:
- When a closed type expansion tank on a hot water boiler is completely filled with water and the water in the system is raised in temperature so that it expands, the result will be that the:
- A closed expansion tank is often equipped with:
- A closed type expansion tank in a hot water heating system must:
- A pressure or altitude gauge for a hot water heating boiler:
- In a closed expansion tank system an air separator:
- An automatic fill valve for a hot water boiler:
- When too much air has been absorbed by water in the expansion tank of a closed system, the tank must be:
- The temperature indicator of a hot water boiler should indicate water temperature:
- If a hot-water heating boiler has an automatic fill valve, and is requiring a lot of makeup water, this may indicate:
- The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated approximately to not less than _____ times the maximum allowable working pressure.
- Boiler stop valves shall be:
- The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated to not more than _____ times the pressure at which the safety relief valve is set.