Pipe Fittings, Valves etc. Flashcards
T OR F - An orifice flange is used for measuring flow in a piping system
True
T OR F - Caps are used to close female openings
False
T OR F - A union is essentially a pipe coupling
True
T OR F - Brass is an alloy of copper and zinc
True
T OR F - Used threaded lubricants or pipe dope on male threads only
True
Flared joints are well adapted to high pressure service
True
Many factors must be considered in selecting the correct Victaulic gasket for a specific service
True
One type of gate valve is the rising stem, outside screw and yoke
True
Some valves have a 4 part body
False
Springs are sometimes used in check valves to seat the disk quickly
True
A ball lift check should only be installed in a horizontal line
True
A swing check valve ensures a positive shut off
False
A pressure relief valve is used to relieve a build up of excessive pressure in a piping system
True
The thermal sensing rod of a T & P valve is usually installed on a bottom of a water heater
False
Flow control valves are installed in hydronic systems to create gravity circulation
False
The most commonly used bonnet for larger sized valves is the bolted bonnet
True
When a valve has a rating of 125 lb S, 200 lb W.O.G. It can be used on a 200 lb steam system
False
Temperature and pressure are the only considerations which must be considered when installing valves
False
Pipe guide allow the pipe to move in an axial direction only
True
The sizes of pipe are identified by the measurement called the
Nominal pipe size (NPS)
Steel pipe is supplied with the following end finishes:
PESC (Plain End Square Cut)
T&C (Threaded and coupled
TBE (Threaded Both Ends)
Flanges are made in sizes as small as
1/2”
A ___ coating can be applied to protect steel pipe by sealing the base metal from corrosive moisture
Zinc
What is another name for an elbow fitting
90
A __ bolt is threaded on both ends
stud
The name of all segments of dies used for cutting threads is called?
chasers
A ____ bend makes a 180 degree turn in a pipeline
return
A __ wound gasket may include a centering ring, an inner ring or both
spiral
A ___ is used to connect two pieces of pipe of different sizes in a straight line
coupling
The best practice is to replace __ in full sets
chasers
What are the three types of welded joints
Flange, socket, butt
Pipe used in ___ welding does not require beveling
socket
Only schedule ___ PVC pipe may be threaded
80
A ___ wrench should be used to tighten PVC and CPVC pipe flange joints
torque
The four principal functions of valves are to ___, ___, ___, ___, flow.
start, stop, direct, regulate/throttle
What three factors affect a valve’s performance?
pressure, flow, operating conditions
Valve pressure classification is always given in?
psig
Regulating or throttling flow is done with?
globe and angle valves
The two basic types of check valves are?
swing and lift
Valves should be installed so that:
- they can be fully opened
- the stuffing box can be repacked
- the stem and bonnet can be removed for inspection
A factor to consider in the selection of a pipe hanger and support system is
- the movement of fluid
- the temperature of the fluid
- vibration
The most common hanger used in piping systems is the
clevis
A ___ clamp is used to support vertical pipe at locations where the pipe passes through
riser or friction
Pressure ___ are used to reduce incoming pressures
regulators
Boilers subject to damage from excessive pressures should be equipped with
safety
Gate valves should only be used with ___ valves, either fully open or closed
stop
A rotary or ___ turn valve moves from closed to fully open by rotating its stem 90 degrees
one quarter
___ valves can be used for throttling and in some cases shutoff valves
butterfly
What are the two basic styles of butterfly valves
wafer and lug
A ___ bolted gland is a type of
stuffing box
The best way to install a valved in a horizontal line is with the stem
up
___ valves are used where a frequent change in direction of flow in more than one pipeline is required.
Multiport
A ___ gauge is generally used to check the position of gaskets in the joints of a concrete pressure pipeline.
feeler
Flanged joints are made up by bolting two ____ together with a gasket between their ____ faces.
flanges, machined
A __ valve is used when there is a need for absolute tightness around the valve stem.
diaphragm
Swing check valves give __ resistance to flow
minimal
Check valves are used to __________ or __________ reversal of flow in piping.
check, prevent
