API Recommended Practice 574, Inspection of Piping, Tubing Valves, and Fittings, does not
cover
ANSWER
control valves
Piping made by rolling plates to size and welding the seams is larger than ______ inches out-
side diameter.
ANSWER
16
The refining industry generally uses what type piping for severe service?
ANSWER
Seamless
Steel and alloy piping are manufactured to standard dimensions in nominal pipe sizes up to
______ inches.
ANSWER
48
Steel and alloy piping are also manufactured to standard thicknesses designated as sched-
ules in nominal
pipe sizes up to _______ inches.
ANSWER
36
1
,The actual thickness of wrought piping may vary from its nominal thickness by a manufactur-
ing under
tolerance of as much as _________ percent.
ANSWER
12.5
Cast piping has thickness tolerance of + ______ inch and - _______ inch.
ANSWER
1/16, 0
For all nominal pipe sizes of ______ inches and smaller, the size refers to the nominal inside
diameter.
ANSWER
12
Under tolerance of welded pipe often used in refinery service is ________ inch.
ANSWER
0.010
For what service is cast iron piping normally used.
ANSWER
Nonhazardous service, such as water.
Tubing is generally seamlessly drawn, but it may be welded. Its stated size is its actual:
ANSWER
outside diameter
2
,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
ANSWER
a. style valve
What type valve is normally used in a fully open or fully closed position?
ANSWER
gate
What type gate valves have body and port openings that are smaller than the valves' end
opening.
ANSWER
Reduced-port gate valves
What type of gate valve should not be used as block valves associated with pressure relief
devices?
ANSWER
Reduced-port gate valves
What is a globe valve used for?
ANSWER
It is commonly used to regulate fluid flow.
A plug valve consists:
ANSWER
3
, of a tapered or cylindrical truncated cone with a slot that is fitted into a correspondingly
shaped seat.
What type of valve depends upon a spherical type gate has a hole in it and is rotated to open
or close it?
ANSWER
ball valve
What are check valves normally used for?
ANSWER
They are used to automatically prevent back flow.
What are slide valves generally used for?
ANSWER
They are generally used in erosive or high-temperature service.
What type of joint listed below would you NOT use in a 300 psi pipe system?
a. lap-joint flanged
b. welded
c. bell-and-spigot
d. weld-neck flanged
ANSWER
c. bell-and-spigot
What type of pipe joint is generally limited to piping in non-critical service and has a nominal
size of 2 inches
or smaller.
ANSWER
4
cover
ANSWER
control valves
Piping made by rolling plates to size and welding the seams is larger than ______ inches out-
side diameter.
ANSWER
16
The refining industry generally uses what type piping for severe service?
ANSWER
Seamless
Steel and alloy piping are manufactured to standard dimensions in nominal pipe sizes up to
______ inches.
ANSWER
48
Steel and alloy piping are also manufactured to standard thicknesses designated as sched-
ules in nominal
pipe sizes up to _______ inches.
ANSWER
36
1
,The actual thickness of wrought piping may vary from its nominal thickness by a manufactur-
ing under
tolerance of as much as _________ percent.
ANSWER
12.5
Cast piping has thickness tolerance of + ______ inch and - _______ inch.
ANSWER
1/16, 0
For all nominal pipe sizes of ______ inches and smaller, the size refers to the nominal inside
diameter.
ANSWER
12
Under tolerance of welded pipe often used in refinery service is ________ inch.
ANSWER
0.010
For what service is cast iron piping normally used.
ANSWER
Nonhazardous service, such as water.
Tubing is generally seamlessly drawn, but it may be welded. Its stated size is its actual:
ANSWER
outside diameter
2
,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
ANSWER
a. style valve
What type valve is normally used in a fully open or fully closed position?
ANSWER
gate
What type gate valves have body and port openings that are smaller than the valves' end
opening.
ANSWER
Reduced-port gate valves
What type of gate valve should not be used as block valves associated with pressure relief
devices?
ANSWER
Reduced-port gate valves
What is a globe valve used for?
ANSWER
It is commonly used to regulate fluid flow.
A plug valve consists:
ANSWER
3
, of a tapered or cylindrical truncated cone with a slot that is fitted into a correspondingly
shaped seat.
What type of valve depends upon a spherical type gate has a hole in it and is rotated to open
or close it?
ANSWER
ball valve
What are check valves normally used for?
ANSWER
They are used to automatically prevent back flow.
What are slide valves generally used for?
ANSWER
They are generally used in erosive or high-temperature service.
What type of joint listed below would you NOT use in a 300 psi pipe system?
a. lap-joint flanged
b. welded
c. bell-and-spigot
d. weld-neck flanged
ANSWER
c. bell-and-spigot
What type of pipe joint is generally limited to piping in non-critical service and has a nominal
size of 2 inches
or smaller.
ANSWER
4
