Chapter 9 Flashcards
According to the ASME, Section I, PG-99, a hydrostatic test should be performed at _______ MAWP.
A) 2.5 x above
B) 2.0 x above
C) 1.2 x above
D) 1.5 x above
D
The process of inspecting internals of non-straight tubes is to:
A) Pass a wooden ball through the tubes using compressed air
B) Pass a Bore scope through the tubes
C) Remove sections of the tubes for inspection
D) Use a portable light and a visual light collector
A
Prior to the hydrostatic test of any boiler, one extremely important item must be adhered to thus preventing costly damage, which is:
A) The drum internals must be returned to normal
B) The Instrumentation on the water side must be disconnected or isolated
C) The Nitrogen purge must be left on
D) To have the Sodium Nitrate solution increased to 0.5%
B
The very first thing that should be done prior to commissioning of any boiler is have the:
A) Chemical solution for boil out at approximately 35%
B) Low water level shutdown alarm on
C) Water level in the steam drum is at 45%
D) Gauge glass replaced with the normal operating gauge glass
B
During the drying out of new or replaced refractory, the super-heater and drum vents are left open to:
A) For O2 testing
B) Prevent condensation build up
C) Prevent pressure build up
D) Circulate the steam vapor to keep the cool tubes cool and to purge out entrained air
D
The purpose of the Boil Out is to:
A) Remove organic materials such as oil and grease
B) Remove entrained corrosive gasses
C) Condition the boiler water pH
D) Test the Pressure relief valves
A
If dry storage is chosen as your method of boiler lay-up, then the N2 purge should be kept at _____ kPa and maintained on the drum vent.
A) 55
B) 35
C) 25
D) 45
B
For wet boiler lay-up, a pH of approximately _____________ should be maintained to prevent waterside corrosion.
A) 12
B) 10
C) 8
D) 6
B
During preparation for dry storage boiler lay-up, removal of moisture from water side piping is done by introducing a small flame in the firebox. During this dry out flue gas temperatures shouldn’t be allowed to exceed:
A) 250 oC
B) 100 oC
C) 200 oC
D) 150 oC
C
Furnace side inspection involves looking for warpage. Warpage is:
A) Warping or twisting
B) Blistering or bubbling
C) Pitting or grooving
D) Impingement or Erosion
A
For hard to clean or un-accessible boiler water surfaces, acids such as Sulfuric acid are used to remove boiler water hardness scale. During this procedure, the vent valves should be left in the open position because:
A) Once the acid boils during boil out the pressure needs to expelled from the boiler tubes
B) There is an exothermic reaction which causes a pressure increase
C) The chemical reaction to removal of hardness is endothermic and will cause a vacuum
D) H2 gas is produced which needs to be vented from the system
D
During the chemical cleaning – circulation method the super-heater is filled with demineralized water and pressured with N2. What purpose does this serve?
A) Prevents cleaning solution from being expelled out the boiler vents
B) Isolates the super heater loop as the loop isn’t part of the boiler internal piping system
C) Chemicals and N2 pressure added into the super-heater pre-circulation help dissolve the scale
D) Helps maintain chemical wash temperature at 95 oC
B
