20 Questions
What does ASME BPVC IV require for every hot water heating boiler?
Pressure gauge, thermometer, safety relief valve
According to ASME BPVC IV, what is required for pressure indicators in hot water heating boilers?
They should be connected to the flow connection and cannot be shut off from the boiler
Why are siphons not required between the pressure gauge and the boiler in hot water service?
Hot water boilers are completely filled with water and generate no steam
Which of the following is covered elsewhere in detail in ASME BPVC IV?
Safety relief valves
What is the minimum hydrostatic test pressure required for expansion tanks in a system designed for a working pressure of 200 kPa or less?
520 kPa
For systems designed to operate above 200 kPa, what must expansion tanks be designed and constructed in accordance with?
ASME BPVC VIII, Division 1
What is the purpose of installing isolation and drain valves in the piping to a bladder-style expansion tank?
To permit servicing, replacing, and repairing the expansion tank without draining the heating system
What is the purpose of an air separator in the arrangement of a closed expansion tank?
To separate air bubbles from the water flow and direct them into the tank
What can cause corrosion of steel piping and heating units in a non-bladder style expansion tank over time?
Oxygen dissolving into the water in the expansion tank
What eliminates the problem of oxygen dissolving into the water in an expansion tank?
Bladder-style tanks and nitrogen-charged tanks
What is equipped with a gauge glass and a drain valve in the shown arrangement of a closed expansion tank?
The expansion tank
What allows the tank to be drained without draining the system in the shown arrangement of a closed expansion tank?
The connecting line between the tank and the hot water supply header
What is the purpose of an expansion tank in a hot water heating system?
To provide storage space for excess water due to expansion, preventing excessive pressure buildup
What is the purpose of a tridicator gauge in a hot water heating system?
To combine pressure and temperature gauges into a single gauge
What is the minimum and maximum reading for a thermometer in a hot water heating system?
Minimum reading of 20°C and maximum reading of 160-205°C
What type of safety relief valve is required for each hot water heating boiler?
Automatic reseating type, set to relieve at or below MAWP
Where should stop valves be placed in a hot water heating boiler system?
In supply and return pipe connections, allowing for drainage without emptying the entire system
What do altitude gauges in hot water systems indicate?
System fullness in terms of height of water
What is the purpose of an expansion tank in a hot water heating system?
To provide storage space for excess water due to expansion, preventing excessive pressure buildup
What must be the reading of thermometers used in hot water heating systems?
Minimum reading of 20°C and maximum reading of 160-205°C
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.
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.
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