HIGH PRESSURE STEAM TEST
QUESTIONS WITH 100% CORRECT
ANSWERS { GRADED A+}
800 psi safety valve, at what pressure does it lift? - ✔✔824 3%
Gauge reads 175psi 45' below where it is connected to the boiler, what is its true
reading? - ✔✔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? -
✔✔1 year
What is the compression or crushing strength of a steel plate? - ✔✔95,000 psi
BTU's average size plant - ✔✔8500-9500 per one kilowatt hour
What section of ASME boiler and pressure code covers the materials for miniature
boilers? - ✔✔Section II
Fitting of bronze, 95% copper, what should it be hydro tested up to? - ✔✔600 psi
,Why are fire tube boilers preferred over water tube boilers? - ✔✔Lower initial
cost and size
Why are water tube boilers chosen over fire tube boilers? - ✔✔Greater steam
capacity
1 pound of water increases by a factor of ________ when turned into steam -
✔✔1600
What type of power plant does not use steam? - ✔✔Hydroelectric or solar
What is the minimum range for 3 psi gauge with 2 1/4" diameter - ✔✔5 psi
Benefit of a globe valve? - ✔✔Can be throttled to regulate, won't cut valve, parts
easy to repair/replace. Disadvantage is pressure drop
Centrifugal pump has which characteristics? - ✔✔Radial, Axial, Mixed
Which is not a characteristic of a centrifugal pump - ✔✔Vane, reciprocating,
rotary, special, dynamic, displacement
How are safeties tested on a new boiler? - ✔✔Pressurized with steam
How do you calculate the moisture in steam? - ✔✔Throttling calorimeter
,What is added to water in DA? - ✔✔Sodium sulfite, sodium hydroxide
(hydrazine)
Pipes that are not covered by code? - ✔✔Clay
5/16"tube thickness w/no bevel or recess should extend how far past the tube
sheet? - ✔✔5/16"
What is this formula (TS x T x E) / (R x FS) = - ✔✔Maximum allowable working
pressure, psi
Importance of a water column? - ✔✔To attach a gauge glass so that a level can be
read easily
Why do we blow down a water column every shift? - ✔✔To ensure proper level
reading
Low water level in a boiler causes? - ✔✔Overheating of tubes
What removes scale? - ✔✔Phosphate, below 1,000 psi
Bad water treatment and scaling would most effect? - ✔✔The Cycling of boilers,
startups, handling loads, shutdowns, corrosion and fatigue
, Purpose of safety valve on outlet of superheater? - ✔✔Protects the superheater by
providing a constant flow of steam after it pops.
What happens to DA returning condensate is hotter than should be? - ✔✔Steam
bypass closes
How does DA remove oxygen and non-condensables from water? - ✔✔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? - ✔✔Particular
matter PM
At what pressure is a fusible plug needed? - ✔✔Over 50 square feet of heating
surface but not over 200 psi
What can not be connected to a float chamber/water column? - ✔✔Anything that
does not permit escape of steam or water.
Can be connected feedwater regulator, damper regular, steam gauge and drain
What number of hot water boilers is an expansion tank required? - ✔✔1
Type of weld required on a 4" pipe? - ✔✔Butt. All piping over 2" shall be butt
welded
QUESTIONS WITH 100% CORRECT
ANSWERS { GRADED A+}
800 psi safety valve, at what pressure does it lift? - ✔✔824 3%
Gauge reads 175psi 45' below where it is connected to the boiler, what is its true
reading? - ✔✔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? -
✔✔1 year
What is the compression or crushing strength of a steel plate? - ✔✔95,000 psi
BTU's average size plant - ✔✔8500-9500 per one kilowatt hour
What section of ASME boiler and pressure code covers the materials for miniature
boilers? - ✔✔Section II
Fitting of bronze, 95% copper, what should it be hydro tested up to? - ✔✔600 psi
,Why are fire tube boilers preferred over water tube boilers? - ✔✔Lower initial
cost and size
Why are water tube boilers chosen over fire tube boilers? - ✔✔Greater steam
capacity
1 pound of water increases by a factor of ________ when turned into steam -
✔✔1600
What type of power plant does not use steam? - ✔✔Hydroelectric or solar
What is the minimum range for 3 psi gauge with 2 1/4" diameter - ✔✔5 psi
Benefit of a globe valve? - ✔✔Can be throttled to regulate, won't cut valve, parts
easy to repair/replace. Disadvantage is pressure drop
Centrifugal pump has which characteristics? - ✔✔Radial, Axial, Mixed
Which is not a characteristic of a centrifugal pump - ✔✔Vane, reciprocating,
rotary, special, dynamic, displacement
How are safeties tested on a new boiler? - ✔✔Pressurized with steam
How do you calculate the moisture in steam? - ✔✔Throttling calorimeter
,What is added to water in DA? - ✔✔Sodium sulfite, sodium hydroxide
(hydrazine)
Pipes that are not covered by code? - ✔✔Clay
5/16"tube thickness w/no bevel or recess should extend how far past the tube
sheet? - ✔✔5/16"
What is this formula (TS x T x E) / (R x FS) = - ✔✔Maximum allowable working
pressure, psi
Importance of a water column? - ✔✔To attach a gauge glass so that a level can be
read easily
Why do we blow down a water column every shift? - ✔✔To ensure proper level
reading
Low water level in a boiler causes? - ✔✔Overheating of tubes
What removes scale? - ✔✔Phosphate, below 1,000 psi
Bad water treatment and scaling would most effect? - ✔✔The Cycling of boilers,
startups, handling loads, shutdowns, corrosion and fatigue
, Purpose of safety valve on outlet of superheater? - ✔✔Protects the superheater by
providing a constant flow of steam after it pops.
What happens to DA returning condensate is hotter than should be? - ✔✔Steam
bypass closes
How does DA remove oxygen and non-condensables from water? - ✔✔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? - ✔✔Particular
matter PM
At what pressure is a fusible plug needed? - ✔✔Over 50 square feet of heating
surface but not over 200 psi
What can not be connected to a float chamber/water column? - ✔✔Anything that
does not permit escape of steam or water.
Can be connected feedwater regulator, damper regular, steam gauge and drain
What number of hot water boilers is an expansion tank required? - ✔✔1
Type of weld required on a 4" pipe? - ✔✔Butt. All piping over 2" shall be butt
welded
