High pressure steam test questions with answers.

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