Class 4 Boiler Tests Correct QUESTIONS & ANSWERS(GRADED A)
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Course
DC Boiler
Institution
DC Boiler
_______________are the most important valves on the boiler - ANSWER Safety Valves
highest part of the steam side of the boiler. - ANSWER Safety valves are located on the
Only spring-loaded pop type valves are allowed for a ________ - ANSWER safety valve
ASME code requires at least_________...
Class 4 Boiler Tests Correct QUESTIONS &
ANSWERS(GRADED A)
_______________are the most important valves on the boiler - ANSWER Safety Valves
highest part of the steam side of the boiler. - ANSWER Safety valves are located on the
Only spring-loaded pop type valves are allowed for a ________ - ANSWER safety valve
ASME code requires at least__________safety valve on every boiler. - ANSWER one
Boilers with more than______ of heating surface shall have two or more safety valves - ANSWER 500 SQ
FT
Safety valves over 3" in diameter for pressures over 15 PSI shall have a - ANSWER flanged or weld-end
inlet.
_______________must direct proper discharge of steam away from operator and not put strain on
safety valve - ANSWER Safety valve piping
used to express the electrical pressure differential between two points of a conductor i.e. water pressure
required to make water flow in a pipe. - ANSWER Volt
used to express the number of electrons flowing through a conductor per unit of time i.e. flow of water
measured through a pipe measured in gallons per minute. - ANSWER Ampere
basic unit of electrical power. Watts= volts X amperage - ANSWER Watt
used to express resistance to the flow of electrons in a conductor i.e. friction that occurs in pipes as
water flows through. - ANSWER Ohm
,electrons flowing only one way in a circuit. They have a positive and negative terminal. Best example is a
battery or photocell. - ANSWER D.C.-direct current
electron flow that reverses its direction at regular intervals of time. - ANSWER A.C.- alternating current
______is either single phase or three-phrase and is commonly found in building wiring. - ANSWER A.C.-
alternating current
material that promotes free flow of electrons such as copper or aluminum. - ANSWER Electrical
conductor
material that does not allow free flow of electrons such as wood or rubber. - ANSWER Electrical insulator
____________must be mounted directly to the boiler or water column. - ANSWER Glass gauges. Tubular
gauges are used up to 250 PSI and flat gauges for pressures over 250 PSI.
Glass gauge is located at the ______ so the gauge glass is _______ above the highest heating surface on
a fire tube boiler. - ANSWER A) NOWL B) 2-3"
The _____________must be located so the lowest part of the gauge glass is 3" above the lowest safe
operating water level. - ANSWER water column
Pressures over __________ require two separate means of checking water level, either two direct-
reading water gauges or two remote views with one direct-reading gauge. - ANSWER 400 PSI
To maintain, clean and test a gauge glass: - ANSWER 1)Close steam and water valves on water column or
gauge glass. 2)Open drain valve fully, drain and then crack steam valve and allow gentle rush of steam to
pass through water column or gauge glass (>20 sec.) 3)Close steam valve, inspect and repeat until clean.
4)Close blow down valve and simultaneously open steam and water valves, slowly bringing back to
normal operating level.
, If _____________ top line is clogged or closed glass will show as full. - ANSWER glass gauge If bottom
line is clogged or closed water will show as stationary and slowly fill up due to steam condensation.
Glass gauges should be blown down and tested at least _________and preferably each ________change.
- ANSWER A) once a day B) shift
Glass gauges must be connected with minimum ___________, one valve at the top and one valve at the
bottom of the gauge glass so removal/replacement is possible while the boiler is under pressure and
have a minimum____ blow down valve preferably with piping directing discharge away from the
operator. - ANSWER A) ½" piping B) ¼"
The water column is used to___________ of boiler water so accurate readings of the water level in the
glass gauge can be taken. - ANSWER slow down turbulence
The water column is connected with minimum___ piping and have a minimum____ blow down valve. -
ANSWER A) 1" B) 1/4"
All 90* connections going to water column must be fitted with _____ for cleaning. - ANSWER tees
For pressures over _______ all lower piping must have a shield or sleeve to reduce effect temperature
differentials - ANSWER 400 PSI
Valves between boiler and water column must be _____________ that show if the valve is open or
closed. - ANSWER os&y or lever type
Valves on the water column should be ____________. Some areas don't allow valves between the boiler
and water column. - ANSWER locked open
The_____________ is located at the highest part of the steam side of the boiler and each boiler must
have it's own. It must be clearly visible, well lighted and protected from heat and cold. - ANSWER steam
pressure gauge
A steam pressure gauge is used to indicate ____________ in the boiler. - ANSWER steam pressure
, Steam pressure gauges must have a ______ that protects the Bourdon tube from live steam. - ANSWER
siphon or pig tail
¼" _________ pipe can be used for temperatures up to 450* F on steam gauges. - ANSWER brass or
copper
Steel or wrought iron piping must be at least ____and minimum I.D. of ______. - ANSWER A) ½" B) ¼"
Stem pressure gauges must have a ¼" branch connection with valve for attaching a _____________. -
ANSWER test gauge
Steam pressure gauge must be between ____________ times the safety valve setting - ANSWER 1 ½ and
2
Hydrostatic testing raises the boiler pressure______ times the MAWP. - ANSWER 1 ½
A steam pressure gauge must be graduated so the pointer is in near ____________at normal operating
pressure. - ANSWER vertical position
A shut off valve on a steam gauge must be of the__________where you can easily see if it is open or
closed. - ANSWER lever type
Some municipals don't allow _________ between the boiler and steam gauge. - ANSWER valves
Steam pressure gauges can be damaged when: - ANSWER 1.Over pressured. 2.Subjected to over
vibration. 3.Subjected to high heat. 4.Pressure applied to fast can damage Bourbon tube.
True or False. To maintain gauges replace broken glass to keep dirt out of mechanical parts, only use high
quality gauge oil as regular oil attracts dirt and is detrimental to gauge operation. - ANSWER TRUE
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