CATEGORIES:

# Flow Measurement - Orifice Plate Installation

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Question 1:
The insertion of straightening vanes in the straight run of pipe that is available ________________ from the orifice plate can be used to obtain reasonably accurate metering with a _____________ length of straight pipe, in a run where the recommended length of pipe cannot not be used.
A - upstream, longer
B - downstream, shorter
C - downstream, longer
D - upstream, shorter
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Question 2:
In theory, vena contracta taps provide the most accurate measurements. The vena contracta is the:
A - Point of greatest turbulence
B - Point of maximum pressure
C - Point of minimum pressure
D - Point of minimum temperature
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Question 3:
Flange taps are the most widely used means of measuring differential pressure across an orifice plate. The taps are placed within the orifice mounting flanges, exactly:
A - 0.254 m upstream and downstream of the respective faces of the plate
B - 2.54 mm upstream and downstream of the respective faces of the plate
C - 254 mm upstream and downstream of the respective faces of the plate
D - 25.4 mm upstream and downstream of the respective faces of the plate
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Question 4:
Liquid flow pressure connection should be made at the __________________ of the line and the sensing lines sloped __________________ the transmitter to allow accumulated gas to migrate back into the pipe.
A - Top, away from
B - Side, toward
C - Top, toward
D - Bottom, away from
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Question 5:
If the recommended length of pipe cannot be provided upstream of the orifice plate, straightening vanes may be used to:
A - Reduce swirl or vortices in the flow
B - Decrease the beta ratio and the severity of the flow disturbance
C - Avoid errors caused by elevation changes
D - Increase swirl or vortices in the flow
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Question 6:
Bevelled orifice plates must always be installed with:
A - The flat side upstream and the bevelled side downstream
B - The face of the flange extended beyond the end of the pipe
C - The flat side downstream and the bevelled side upstream
D - A recess between the end of the pipe and orifice plate
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Question 7:
The type of differential pressure connection (tap) that is designed to measure the greatest pressure differential in the flow run is:
A - Flange taps
B - Vena contracta taps
C - Pipe taps
D - Corner taps
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Question 8:
Prior to operating the orifice plate changer, it should be:
A - Dismantled and thoroughly cleaned
B - Pressure tested
C - Lubricated through the grease fitting
D - All of the above
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Question 9:
A slide valve plate changer allows for the:
A - Changing or removal of orifice plates without shutting down or opening the flow line
B - Orifice plates to be cleaned more regularly
C - Changing of orifice plates without shutting down plant production
D - All of the above
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Question 10:

___________ flow pressure connections should be made at the _________________of the line so that sediment and condensate will not enter the transmitter sensing lines.
A - Vapour, bottom or at the side
B - Gas, top or at the side
C - Liquid, top or bottom
D - Steam, bottom
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Question 11:

Of the types of pressure connections discussed, the only connection that may be made at the top or at the side of the line is a:
A - Liquid flow pressure connection
B - Vena contracta tap
C - Steam or other vapour flow pressure connection
D - Gas flow pressure connection
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Question 12:
The type of differential pressure connection (tap) that is used for pipe sizes less than 50mm (2in.) nominal pipe diameter with low beta ratios is:
A - Pipe taps
B - Corner taps
C - Flange taps
D - Vena contracta taps
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Question 13:

__________________ flow pressure connections should be made at the __________________ of the line.
A - Steam, side
B - Gas, bottom or the side
C - Liquid, top
D - Steam, bottom
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Question 14:
The type of differential pressure connection (tap) that is used to measure the permanent pressure loss that results whenever a fluid flows through a restriction is:
A - Corner taps
B - Pipe taps
C - Vena contracta taps
D - Flange taps
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Question 15:
To install an orifice plate with an orifice plate changer, the first step is to depressurize the upper chamber by opening the bleed valve.
A - False
B - True
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Question 16:
Orifice plates:
A - should be cleaned with a suitable solvent.
B - must be clamped so that the orifice bore is concentric with the pipe.
C - should have the upstream side of the handle marked ?inlet?.
D - All of the above
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Question 17:
Fluid should enter the orifice plate with a fully developed velocity profile, free of vortices to allow for:
A - increased beta ratio and flow disturbance
B - the elimination of "rattle" in the pipes
C - the highest degree of measurement accuracy
D - the installation of straightening vanes
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Question 18:
If the orifice plate is greasy, it should be cleaned using sandpaper or emery.
A - True
B - False
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Question 19:
Both types of straightening vanes (fin-type and flanged-type tubular vane) are bolted or welded to the pipe to allow for:
A - The thickness of the gasket
B - Movement of both ends of the vane
C - Expansion without distortion
D - Valves and fittings

Date: 2015-12-17; view: 937

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