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API 574 For API 570: Questions With A+ Answers
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API 574 For API 570: Questions With A+ AnswersAPI Recommended Practice 574, Inspection of Piping, Tubing Valves, and
Fittings, does not cover:
a. control valves.
b. piping smaller than 2" NPS.
c. tubing smaller than 1.5" diameter.
d. fittings smaller than 2" NPS Right Ans - A
The refining industry generally uses what type piping for severe service?
a. brass
b. cast
c. seamless
d. longitudinal seam welded Right Ans - C
Piping made by rolling plates to size and welding the seams is larger than
______ inches outside diameter.
a. 10
b. 16
c. 14
d. 12 Right Ans - B
Steel and alloy piping are manufactured to standard dimensions in nominal
pipe sizes up to ______ inches.
a. 24
b. 36
c. 48
d. 50 Right Ans - C
Steel and alloy piping are also manufactured to standard thicknesses
designated as schedules in nominal pipe sizes up to _______ inches.
a. 24
b. 36
c. 48
d. 50 Right Ans - B
,The actual thickness of wrought piping may vary from its nominal thickness
by a manufacturing under tolerance of as much as _________ percent.
a. 12.5
b. 12.0
c. 10.0
d. 10.5 Right Ans - A
Cast piping has thickness tolerance of + ______ inch and - _______ inch.
a. 1/16, 0
b. 1/16, 1/16
c. 1/32, 1/32
d. 3/64, 0 Right Ans - A
For all nominal pipe sizes of ______ inches and smaller, the size refers to the
nominal inside diameter.
a. 10
b. 12
c. 14
d. 16 Right Ans - B
Under tolerance of welded pipe often used in refinery service is ________ inch.
a. 0.125
b. 0.050
c. 0.010
d. 0.005 Right Ans - C
For what service is cast iron piping normally used.
a. Nonhazardous service, such as lube oils
b. Nonhazardous service, such as water.
c. Corrosive service, such as acids.
d. Noncorrosive service, such as low temperature caustic. Right Ans - B
Tubing is generally seamlessly drawn, but it may be welded. Its stated size is
its actual:
a. outside radius.
b. inside diameter.
c. outside diameter.
d. inside radius. Right Ans - C
, There are many type valves. Which is the incorrect valve type listed below?
a. style valve
b. gate valve
c. check valve
d. globe valve Right Ans - A
What type valve is normally used in a fully open or fully closed position?
a. gate
b. globe
c. slide
d. plug Right Ans - A
What type gate valves have body and port openings that are smaller than the
valves' end opening.
a. Borda tube gate valves
b. Reduced-port gate valves
c. Weir gate valves
d. Sluice gate valves Right Ans - B
What type of gate valve should not be used as block valves associated with
pressure relief devices?
a. Sluice gate valves
b. Weir gate valves
c. Borda tube gate valves
d. Reduced-port gate valves Right Ans - D
What is a globe valve used for?
a. It is normally used as block valve.
b. It is commonly used to regulate fluid flow.
c. It is ordinarily used to measure pressure drop.
d. It is frequently used in place of a slide valve. Right Ans - B
A plug valve consists:
a. of a slide or slides that operate perpendicularly to the flow and move on rail
guides to interrupt flow.
b. of a ball with a hole in it that fits into the valve body and interrupts the flow
of material.
c. of a circular gate that operates in and out in the body to interrupt flow.
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