High pressure steam test questions with
answers
800 psi safety valve, at what pressure does it lift? - ** VERIFIED ANSWERS **✔✔824 3%
Gauge reads 175psi 45' below where it is connected to the boiler, what is its true reading? - **
VERIFIED ANSWERS **✔✔155.5. 45 X 0.433 = 19.50psi 175 - 19.50 = 155.5
How often does a welder who works on pressure tanks need to be requalified? - ** VERIFIED
ANSWERS **✔✔1 year
What is the compression or crushing strength of a steel plate? - ** VERIFIED ANSWERS
**✔✔95,000 psi
BTU's average size plant - ** VERIFIED ANSWERS **✔✔8500-9500 per one kilowatt hour
What section of ASME boiler and pressure code covers the materials for miniature boilers? - **
VERIFIED ANSWERS **✔✔Section II
Fitting of bronze, 95% copper, what should it be hydro tested up to? - ** VERIFIED ANSWERS
**✔✔600 psi
Why are fire tube boilers preferred over water tube boilers? - ** VERIFIED ANSWERS **✔✔Lower
initial cost and size
Why are water tube boilers chosen over fire tube boilers? - ** VERIFIED ANSWERS **✔✔Greater
steam capacity
1 pound of water increases by a factor of ________ when turned into steam - ** VERIFIED
ANSWERS **✔✔1600
,What type of power plant does not use steam? - ** VERIFIED ANSWERS **✔✔Hydroelectric or
solar
What is the minimum range for 3 psi gauge with 2 1/4" diameter - ** VERIFIED ANSWERS **✔✔5
psi
Benefit of a globe valve? - ** VERIFIED ANSWERS **✔✔Can be throttled to regulate, won't cut
valve, parts easy to repair/replace. Disadvantage is pressure drop
Centrifugal pump has which characteristics? - ** VERIFIED ANSWERS **✔✔Radial, Axial, Mixed
Which is not a characteristic of a centrifugal pump - ** VERIFIED ANSWERS **✔✔Vane,
reciprocating, rotary, special, dynamic, displacement
How are safeties tested on a new boiler? - ** VERIFIED ANSWERS **✔✔Pressurized with steam
How do you calculate the moisture in steam? - ** VERIFIED ANSWERS **✔✔Throttling calorimeter
What is added to water in DA? - ** VERIFIED ANSWERS **✔✔Sodium sulfite, sodium hydroxide
(hydrazine)
Pipes that are not covered by code? - ** VERIFIED ANSWERS **✔✔Clay
5/16"tube thickness w/no bevel or recess should extend how far past the tube sheet? - ** VERIFIED
ANSWERS **✔✔5/16"
What is this formula (TS x T x E) / (R x FS) = - ** VERIFIED ANSWERS **✔✔Maximum allowable
working pressure, psi
, Importance of a water column? - ** VERIFIED ANSWERS **✔✔To attach a gauge glass so that a
level can be read easily
Why do we blow down a water column every shift? - ** VERIFIED ANSWERS **✔✔To ensure
proper level reading
Low water level in a boiler causes? - ** VERIFIED ANSWERS **✔✔Overheating of tubes
What removes scale? - ** VERIFIED ANSWERS **✔✔Phosphate, below 1,000 psi
Bad water treatment and scaling would most effect? - ** VERIFIED ANSWERS **✔✔The Cycling of
boilers, startups, handling loads, shutdowns, corrosion and fatigue
Purpose of safety valve on outlet of superheater? - ** VERIFIED ANSWERS **✔✔Protects the
superheater by providing a constant flow of steam after it pops.
What happens to DA returning condensate is hotter than should be? - ** VERIFIED ANSWERS
**✔✔Steam bypass closes
How does DA remove oxygen and non-condensables from water? - ** VERIFIED ANSWERS
**✔✔Bubbling trays, spray, or combination of these, steam, addition of sulfite or hydrazine and a
vent
Before the clean air act (1963) what were people concerned with? - ** VERIFIED ANSWERS
**✔✔Particular matter PM
At what pressure is a fusible plug needed? - ** VERIFIED ANSWERS **✔✔Over 50 square feet of
heating surface but not over 200 psi
What can not be connected to a float chamber/water column? - ** VERIFIED ANSWERS
**✔✔Anything that does not permit escape of steam or water.
Can be connected feedwater regulator, damper regular, steam gauge and drain
answers
800 psi safety valve, at what pressure does it lift? - ** VERIFIED ANSWERS **✔✔824 3%
Gauge reads 175psi 45' below where it is connected to the boiler, what is its true reading? - **
VERIFIED ANSWERS **✔✔155.5. 45 X 0.433 = 19.50psi 175 - 19.50 = 155.5
How often does a welder who works on pressure tanks need to be requalified? - ** VERIFIED
ANSWERS **✔✔1 year
What is the compression or crushing strength of a steel plate? - ** VERIFIED ANSWERS
**✔✔95,000 psi
BTU's average size plant - ** VERIFIED ANSWERS **✔✔8500-9500 per one kilowatt hour
What section of ASME boiler and pressure code covers the materials for miniature boilers? - **
VERIFIED ANSWERS **✔✔Section II
Fitting of bronze, 95% copper, what should it be hydro tested up to? - ** VERIFIED ANSWERS
**✔✔600 psi
Why are fire tube boilers preferred over water tube boilers? - ** VERIFIED ANSWERS **✔✔Lower
initial cost and size
Why are water tube boilers chosen over fire tube boilers? - ** VERIFIED ANSWERS **✔✔Greater
steam capacity
1 pound of water increases by a factor of ________ when turned into steam - ** VERIFIED
ANSWERS **✔✔1600
,What type of power plant does not use steam? - ** VERIFIED ANSWERS **✔✔Hydroelectric or
solar
What is the minimum range for 3 psi gauge with 2 1/4" diameter - ** VERIFIED ANSWERS **✔✔5
psi
Benefit of a globe valve? - ** VERIFIED ANSWERS **✔✔Can be throttled to regulate, won't cut
valve, parts easy to repair/replace. Disadvantage is pressure drop
Centrifugal pump has which characteristics? - ** VERIFIED ANSWERS **✔✔Radial, Axial, Mixed
Which is not a characteristic of a centrifugal pump - ** VERIFIED ANSWERS **✔✔Vane,
reciprocating, rotary, special, dynamic, displacement
How are safeties tested on a new boiler? - ** VERIFIED ANSWERS **✔✔Pressurized with steam
How do you calculate the moisture in steam? - ** VERIFIED ANSWERS **✔✔Throttling calorimeter
What is added to water in DA? - ** VERIFIED ANSWERS **✔✔Sodium sulfite, sodium hydroxide
(hydrazine)
Pipes that are not covered by code? - ** VERIFIED ANSWERS **✔✔Clay
5/16"tube thickness w/no bevel or recess should extend how far past the tube sheet? - ** VERIFIED
ANSWERS **✔✔5/16"
What is this formula (TS x T x E) / (R x FS) = - ** VERIFIED ANSWERS **✔✔Maximum allowable
working pressure, psi
, Importance of a water column? - ** VERIFIED ANSWERS **✔✔To attach a gauge glass so that a
level can be read easily
Why do we blow down a water column every shift? - ** VERIFIED ANSWERS **✔✔To ensure
proper level reading
Low water level in a boiler causes? - ** VERIFIED ANSWERS **✔✔Overheating of tubes
What removes scale? - ** VERIFIED ANSWERS **✔✔Phosphate, below 1,000 psi
Bad water treatment and scaling would most effect? - ** VERIFIED ANSWERS **✔✔The Cycling of
boilers, startups, handling loads, shutdowns, corrosion and fatigue
Purpose of safety valve on outlet of superheater? - ** VERIFIED ANSWERS **✔✔Protects the
superheater by providing a constant flow of steam after it pops.
What happens to DA returning condensate is hotter than should be? - ** VERIFIED ANSWERS
**✔✔Steam bypass closes
How does DA remove oxygen and non-condensables from water? - ** VERIFIED ANSWERS
**✔✔Bubbling trays, spray, or combination of these, steam, addition of sulfite or hydrazine and a
vent
Before the clean air act (1963) what were people concerned with? - ** VERIFIED ANSWERS
**✔✔Particular matter PM
At what pressure is a fusible plug needed? - ** VERIFIED ANSWERS **✔✔Over 50 square feet of
heating surface but not over 200 psi
What can not be connected to a float chamber/water column? - ** VERIFIED ANSWERS
**✔✔Anything that does not permit escape of steam or water.
Can be connected feedwater regulator, damper regular, steam gauge and drain
