4AE3.5 U3 C4 Obj 4 MEDIUM

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Questions and Answers

Which fitting is required by ASME BPVC IV for every hot water heating boiler?

Thermostat

Flow meter

Pressure or altitude gauge (correct)

Check valve

What is the purpose of the stop valves in hot water heating boilers?

To control the flow of water into the boiler (correct)

To monitor the pressure inside the boiler

To regulate the temperature of the water

To release excess water from the boiler

Why are siphons not required between the gauge and the boiler in hot water service?

Because siphons are only used in steam boilers

To increase the accuracy of pressure readings

Because hot water boilers are completely filled with water and generate no steam (correct)

To prevent water from flowing back into the gauge

Which fitting is covered in detail elsewhere in ASME BPVC IV, apart from safety relief valves, temperature controls, low water fuel cut-offs, and expansion tanks?

Pressure or altitude gauge Signup and view all the answers

What is the minimum hydrostatic test pressure required for a tank designed for a working pressure of 200 kPa or less?

520 kPa Signup and view all the answers

For systems designed to operate above 200 kPa, what type of expansion tanks must be used?

Pressure vessels designed and constructed in accordance ASME BPVC VIII, Division 1 Signup and view all the answers

What is a good practice for bladder-style expansion tanks, although not a requirement?

Installing isolation and drain valves in the piping Signup and view all the answers

What separates air bubbles from the water flow and directs them into the tank in the shown arrangement of a closed expansion tank?

Air separator Signup and view all the answers

Which type of expansion tanks bring air into direct contact with the water, potentially causing corrosion of steel piping and heating units?

Non-bladder style expansion tanks Signup and view all the answers

What is used to allow draining of the tank without draining the system for bladder-style expansion tanks?

Shutoff valve in the connecting line between the tank and the hot water supply header Signup and view all the answers

What eliminates the problem of oxygen dissolving into the water in expansion tanks over time?

Bladder-style tanks and nitrogen-charged tanks Signup and view all the answers

Where is expansion tank operation and maintenance extensively covered?

"Part B, Unit 4, Chapter 3 Operational Checks" Signup and view all the answers

What is the purpose of an expansion tank in a hot water heating system?

To store excess water due to expansion and prevent excessive pressure buildup Signup and view all the answers

What type of gauges are commonly combined into single gauges known as tridicator gauges?

Pressure and temperature gauges Signup and view all the answers

What is the minimum reading for thermometers in hot water heating boilers?

20°C Signup and view all the answers

In closed hot water heating systems, what should the pressure be in relation to altitude?

Always greater than altitude Signup and view all the answers

What type of safety relief valve must be installed in each hot water heating boiler?

Automatic reseating type safety relief valve, set to relieve at or below MAWP Signup and view all the answers

Where should stop valves be placed in a hot water heating system?

In supply and return pipe connections on all hot water heating boilers Signup and view all the answers

What is the function of altitude gauges in hot water systems?

They are pressure gauges calibrated in terms of height of water, indicating system fullness Signup and view all the answers

Where should closed expansion tanks be connected in a hot water heating system?

To supply main or top of boiler Signup and view all the answers

What should additional safety relief valves be set to for boilers up to 400kPa?

Not more than 40kPa Signup and view all the answers

What operating conditions are closed expansion tanks suitable for?

High operating temperatures and pressures Signup and view all the answers

What type of gauge is operated by bourdon tube assembly?

One of the pointers on gauges in hot water systems Signup and view all the answers

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 essential fittings such as pressure gauges, thermometers, safety relief valves, and more.