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Questions and Answers
What does ASME BPVC IV require for every hot water heating boiler?
What does ASME BPVC IV require for every hot water heating boiler?
- Pressure gauge, thermometer, safety relief valve (correct)
- Stop valves, blowoff connections, safety relief valves
- Thermometer, expansion tank, low water fuel cut-offs
- Temperature controls, altitude gauge, expansion tank
According to ASME BPVC IV, what is required for pressure indicators in hot water heating boilers?
According to ASME BPVC IV, what is required for pressure indicators in hot water heating boilers?
- The handle of the cock should be perpendicular to the pipe
- They should be connected to the flow connection and cannot be shut off from the boiler (correct)
- They should have a siphon between the gauge and the boiler
- They need to be connected to the expansion tank
Why are siphons not required between the pressure gauge and the boiler in hot water service?
Why are siphons not required between the pressure gauge and the boiler in hot water service?
- The pressure in hot water boilers is always very low
- Siphons are only necessary for safety relief valves
- Hot water boilers are completely filled with water and generate no steam (correct)
- Siphons cause pressure fluctuations in hot water boilers
Which of the following is covered elsewhere in detail in ASME BPVC IV?
Which of the following is covered elsewhere in detail in ASME BPVC IV?
What is the minimum hydrostatic test pressure required for expansion tanks in a system designed for a working pressure of 200 kPa or less?
What is the minimum hydrostatic test pressure required for expansion tanks in a system designed for a working pressure of 200 kPa or less?
For systems designed to operate above 200 kPa, what must expansion tanks be designed and constructed in accordance with?
For systems designed to operate above 200 kPa, what must expansion tanks be designed and constructed in accordance with?
What is the purpose of installing isolation and drain valves in the piping to a bladder-style expansion tank?
What is the purpose of installing isolation and drain valves in the piping to a bladder-style expansion tank?
What is the purpose of an air separator in the arrangement of a closed expansion tank?
What is the purpose of an air separator in the arrangement of a closed expansion tank?
What can cause corrosion of steel piping and heating units in a non-bladder style expansion tank over time?
What can cause corrosion of steel piping and heating units in a non-bladder style expansion tank over time?
What eliminates the problem of oxygen dissolving into the water in an expansion tank?
What eliminates the problem of oxygen dissolving into the water in an expansion tank?
What is equipped with a gauge glass and a drain valve in the shown arrangement of a closed expansion tank?
What is equipped with a gauge glass and a drain valve in the shown arrangement of a closed expansion tank?
What allows the tank to be drained without draining the system in the shown arrangement of a closed expansion tank?
What allows the tank to be drained without draining the system in the shown arrangement of a closed expansion tank?
What is the purpose of an expansion tank in a hot water heating system?
What is the purpose of an expansion tank in a hot water heating system?
What is the purpose of a tridicator gauge in a hot water heating system?
What is the purpose of a tridicator gauge in a hot water heating system?
What is the minimum and maximum reading for a thermometer in a hot water heating system?
What is the minimum and maximum reading for a thermometer in a hot water heating system?
What type of safety relief valve is required for each hot water heating boiler?
What type of safety relief valve is required for each hot water heating boiler?
Where should stop valves be placed in a hot water heating boiler system?
Where should stop valves be placed in a hot water heating boiler system?
What do altitude gauges in hot water systems indicate?
What do altitude gauges in hot water systems indicate?
What is the purpose of an expansion tank in a hot water heating system?
What is the purpose of an expansion tank in a hot water heating system?
What must be the reading of thermometers used in hot water heating systems?
What must be the reading of thermometers used in hot water heating systems?
Study Notes
- "Altitude" gauges in hot water systems are pressure gauges calibrated in terms of height of water, indicating system fullness.
- Gauges have two pointers: one operated by bourdon tube assembly, and another manually placed.
- In closed hot water heating systems, pressure should always be greater than altitude.
- Pressure and temperature gauges are commonly combined into single gauges, known as tridicator gauges.
- Hot water heating boilers must have a thermometer or temperature sensor, indicating temperature at or near boiler outlet.
- Thermometers must have a minimum reading of 20°C and a maximum reading of 160-205°C.
- Each hot water heating boiler must have at least one automatic reseating type safety relief valve, set to relieve at or below MAWP.
- Additional safety relief valves may be set to higher than MAWP, but not more than 40kPa for boilers up to 400kPa, or 5% for boilers exceeding 400kPa.
- Stop valves must be placed in supply and return pipe connections on all hot water heating boilers, allowing for drainage without emptying the entire system.
- Expansion tanks provide storage space for excess water due to expansion, preventing excessive pressure buildup.
- Closed expansion tanks can be used in systems with high operating temperatures and pressures, and are connected to supply main or top of boiler.
- An expansion tank must be installed that will be consistent with the volume and capacity of the system.
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Description
Test your knowledge of the code requirements for fittings on hot water heating boilers according to ASME BPVC IV. Learn about the specific fittings and controls mandated by the ASME code for hot water heating boilers.
