Piping Materials and Connections Flashcards
The three general types of flange connections are the screwed, the lapped or loose flange (Van Stone) and the ________ type.
A) Welded B) Threaded C) Soldered D) Brazed E) Bolted
A) Welded
Cast iron has a high resistance to:
A) Water pressure B) Tensile stress C) Temperature changes D) Condensate pressure E) Corrosion
E) Corrosion
The best material for gaskets in very high temperature areas would be:
A) Plastic foam B) Metallic C) Rubber D) Nylon E) Cork
B) Metallic
Pipe is manufactured in two main categories, welded and:
A) Flanged B) Brazed C) Threaded D) Soldered E) Seamless
E) Seamless
Ring joint gaskets are:
A) Oval in cross-section B) Round in cross-section C) Hollow D) Flat E) Square in cross-section
A) Oval in cross-section
As a piping and pipe fitting material, cast steel is used:
A) For construction of welded pipe B) Mainly for instrumentation and control piping C) Primarily for special applications D) Extensively for fittings E) For steam traps only
D) Extensively for fittings
Gaskets are used in pipe flange joints to:
A) Make up for the misalignment of the pipe
B) Prevent air ingress in high pressure steam mains
C) Provide cushioning in the event of water hammer
D) Allow for pipe expansion between each flanged joint
E) Prevent leakage because of small imperfections in the flange face
E) Prevent leakage because of small imperfections in the flange face
Standard commercial pipe nominal size is:
A) Equal to nominal outside diameter up to 254 mm
B) Equal to approximate inside diameter up to 304.8 mm
C) Equal to nominal inside pipe diameter
D) Equal to nominal outside pipe diameter
E) Is not manufactured anymore
B) Equal to approximate inside diameter up to 304.8 mm
Screwed connections have threads that conform with which standard?
A) American Mechanical Pipe B) American Commercial Pipe C) American National Pipe D) American Society Pipe E) American Standard Pipe
E) American Standard Pipe
For power plants, materials used for the manufacturing of pipes must be:
A) Alloyed with sulphur B) Cast iron C) Seamless stainless steel D) Suited to the operating conditions E) Case hardened
D) Suited to the operating conditions
Double extra strong pipe is denoted by:
A) ES B) 2S C) XXS D) DES E) SS
C) XXS
Pipe fittings without clearly identified service designation markings should be:
A) Rejected B) Painted as required by the color code C) Reported to the Boilers Branch D) Tested and used E) Used only with water systems
A) Rejected
When tightening pipe flange bolts:
A) Use a cross-over method B) The top bolts must be tightened first C) Tighten them in rotation sequence D) Tighten every second bolt first then tighten the others E) The gasket should be glued in place
A) Use a cross-over method
What is the wall thickness of a double extra-strong pipe with an actual outside diameter of 42.16 mm?
A) 31.75 mm B) 51.93 mm C) 9.70 mm D) 61.56 mm E) 136.25 mm
C) 9.70 mm
A disadvantage of using threads to join pipes and fittings is that it:
A) Requires the services of a pipe fitter B) Does not allow for expansion C) Weakens the pipe D) Is more costly E) Cannot be repaired
C) Weakens the pipe
