Power Engineering 4B Unit 3 Boiler Safety Devices Questions and Answers with Verified Solutions | Latest Update

Power Engineering 4B Unit 3 Boiler Safety Devices Questions and
Answers with Verified Solutions | Latest Update


QUESTION
pressure relief valve

Answer:
a pressure relief device designed to actuate on inlet static pressure and recluse after normal
conditions have been restored

QUESTION
temperature and pressure relief valve (T&P valve)

Answer:
a pressure relief valve that may be actuated by pressure at the valve inlet or by temperature at the
valve inlet. Does not pop during over-pressurization.

QUESTION
safety valve

Answer:
a pressure relief valve characterized by rapid opening and normally used to relieve compressible
fluids.

QUESTION
Safety Relief Valve

Answer:
a pressure relief valve characterized by gradual opening that is generally proportional to the
increase in pressure. It can be used for compressible and incompressible fluids.

QUESTION
safety valve blowdown

Answer:
No separate answer was provided in the source PDF.

QUESTION
explain why a super heater safety valve is set to open before, and to close after, a drum safety
valve

Answer:
If set tl steam drum pressure, the safety valves on the superheater would likely not open. The
superheater tubes would overheat due to the loss of the cooling steam.

,QUESTION
A safety valve blowdown adjusting ring is moved so that it covers the huddling chamber escape
ports. After this change, the safety valve will reseat at _______

Answer:
far less drop in boiler pressure

QUESTION
What is the purpose of a safety valve body drain opening? When should it be plugged off?

Answer:
No separate answer was provided in the source PDF.

QUESTION
Compare the design and operation of the pressure relief valves used for hot water heating boilers
to the valves used for steam boilers

Answer:
No separate answer was provided in the source PDF.

QUESTION
What causes safety relief valve to open frequently on hot water boilers?

Answer:
- waterlogged heating system

QUESTION
A hot water heating boiler has a safety relief valve set to 207 Kia. How often should it get a try
leveler test?

Answer:
Every 6 months

QUESTION
What determines safety valve opening pressure, closing pressure l, and blowdown?

Answer:
No separate answer was provided in the source PDF.

QUESTION
At what temperature does a T&P valve open?

Answer:
99°C

, QUESTION
What is the MAWP permitted by ASME IV for a potable hot water tank?

Answer:
1100 kPa

QUESTION
Two differences between a T&P valve and a fusible plug

Answer:
Fusible plug does not reseat aka one time use.

QUESTION
Relief Valve

Answer:
a pressure relief valve characterized by gradual opening that is generally proportional to the
increase in pressure. It is normally used for incompressible fluids.

QUESTION
ASME BVPC Section I, Part PG-73 prohibits

Answer:
the use of valves with bronze parts for superheaters operating over 230°C.

QUESTION
ASME BVPC Section 1, Part PG-68 requires

Answer:
all superheater and reheater pressure relief valves to be constructed of steel or alloy steel.

QUESTION
Try Lever

Answer:
can manually lift the valve. The Lever raises the valve spindle, which is connected to the valve
disc. This must only be done if the valve is subjected to a pressure of at least 75% of boiler
pressure other the try Lever or valve spindle can be damaged.

QUESTION
Huddling Chamber

Answer:
Part on a safety valve that increases the area of the safety valve disc, thus increasing the total
upward force, causing the valve to pop open