Test 3 Flashcards
What cast iron item is not allowed on a high-pressure boiler?
Nozzles or flanges
When piping up a boiler gauge glass to a water tube boiler, the lowest visible part of the Water gauge glass shall be at least how many inches above the lowest permissible water level (determined by the boiler manufacturer?)
2
The ASME high pressure boiler code limits the use of non-ferrous valves. What is the limitation for 250 psi class bronze threaded gate valve?
406°F
All gage glass connections shall not be less than what size pipe?
1/2”
The ASME high pressure boiler code says that non-ferrous pipe or tubes shall not be used in the boiler proper for any service where the temperature exceeds how many degrees?
406°F
Gage glass drains shall have an unrestricted drain opening of not less than _______ inch.
1/4
When two or more high pressure boilers are connected to a common steam header, the connection from each boiler having a manhole opening shall be fitted with,
Two stop valves having an ample free-blow drain between them
For high pressure boilers having a water heating surface of more than 100 sq. ft of heating surface the feed connection to the boiler shall not be smaller than what pipe size?
3/4
ASME B.31.1 Power piping code limits the size of slip-on flanges to be used for boiler external piping. The size limitation is what pipe size in diameter?
4
A slow- opening valve requires how many complete turns to be fully opened or closed?
5
The ASME power piping code B31.1 limits the size of ANSI class 600 socket welded for use in boiler external piping. Choose the maximum size limitation.
3
According to the ASME high pressure boiler code, a boiler that has more than how many square feet of heating surface must have two or more safety valves?
500
ASME B31.1 power piping code part 6 boiler external piping requires the attachment of slip on flanges shall be of what type of welds
Double fillet
The steam and water connections to a water column or a water gage glass on a high-pressure boiler shall be such that they?
Readily accessible for internal inspection and cleaning
ASME B31.1 Power piping code requires that boiler blow-off fittings shall be steel and
pressure exceeds what pressure (psi)?
the thickness of pipe and fittings shall not
100
Shut off valves shall not be used in the pipe connections between a boiler and a water column unless they are what type valves (which must be looked and sealed open)?
OS & Y or level fitting
ASME power piping code requires that when the boiler steam outlet is over what size NPS and OS & Y valve shall be used.
2
The bottom blowdown line of a high-pressure water tube boiler is connected to where on the boiler?
The mud drum
Which valve is not appropriate as a boiler steam outlet valve on a high-pressure boiler?
Ball valve
Too quick to open and tephlon gasket
The size of bottom blowoff lines can be reduced under what conditions?
None
