Boiler Flashcards
(153 cards)
Where is caustic embrittlement most likely to occur?
on a riveted joint below the water line
The maintenance of automatic direct fired boilers is covered under what document?
ASME CSD-1
What would be the over-speed trip setting on a turbine with a normal operating speed of 1770 rpm?
1947 rpm
How are the tube sheets supported in a fire-tube boiler?
by the shell, stays, and tubes
When making adjustments to the firing rate of a power boiler, why should the air be increased to the burner before the fuel?
to prevent incomplete combustion
On a steam boiler in order to prevent the generation of steam greater than the maximum working pressure requires activation of what device?
The high steam pressure limit control
Is it necessary to provide a disconnect switch at an accessible location at the boiler?
An electrical disconnect switch shall be installed at the boiler at an accessible location with a cover plate that can be locked out in the open position
One mechanical horsepower is equal to:
33,000 ft-lb/min
A boiler with a steaming capacity of 27,117 lbs/hr would be rated at how many boiler horsepower?
786
Who is responsible for obtaining pertinent operating, testing, servicing, and cleaning instructions for the controls and safety devices?
It is the responsibility of the installing contractor to deliver all the instructions to the equipment owner/user
How much heat is required to change 2,500 lb of water to steam at 212 degrees?
2,425,750 Btu
What would occur if there was a drop in the velocity of the liquid flowing through a heat exchanger?
the temperature of the liquid would increase
What chemical should be added to boiler feedwater to prevent oxidation of the boiler drum and tubes?
sodium sulfite
What ASME code symbol is used to denote a high pressure power boiler?
S
The purpose of backseating a manual valve in an operating system is to…
isolate system pressure from the packing stuffing box to minimize packing leakage.
Which of the following stack gas readings would indicate fair to good combustion taking place?
low oxygen and carbon monoxide, high carbon dioxide
What is the horsepower rating of a 10,000 kW steam turbine?
13,400 hp
The Mechanical Inspection Bureau incorporates by reference various codes, standards and practices. Once specific safety practice incorporated by reference for licensed operators specifies and identifies one called a qualified individual. How is the qualified individual identified in this reference?
A boiler service technician who is engaged in and responsible for the installation, replacement, repair or service of the boiler, fuel burning controls, and safety devices and is experienced in such work. In some states this individual must also hold an appropriate boiler operator’s license.
If your boiler needs welded repairs, you must get approval for such repairs from the:
authorized inspection agency
What would one standard atmosphere at 14.7 psi be equivalent to in feet of water?
34 feet
What must take place in order for combustion air to flow open automatically during equipment operation?
There must be an adequate opening for the flow of fuel gas into the confines of the boiler room to ensure proper combustion
What is the total horsepower of a plant that has three 350 hp boilers and one 500 kW steam turbine?
1,720 hp
What water treatment chemical is used to control alkalinity in boiler feedwater?
caustic soda
When a low-water fuel cutoff (LWFCO) has activated on a hot water heating boiler what shall happen?
Operation of the LWFCO shall cause a safety shutdown and lockout, requiring a physical manual reset