Electrical Schematics & Drawings
Part No.: 44200004 - Revision 2 SVP Controller Operation Manual 6-9
6.4 Frequently asked questions.
What type of prover is the Honeywell Enraf? The Honeywell Enraf prover is classified as a Small Volume
Unidirectional Piston Displacement Prover.
Why is the Honeywell Enraf prover considered to be
small volume when it can hold up to 350 gallons
of fluid?
The small volume classification is based on the volume displaced
in relationship to the number of flow meter pulses collected. A
large volume prover requires greater than 10,000 meter pulses
be collected to generate a meter factor (typically a pipe prover). A
small volume prover in conjunction with ‘Double chronometry’ can
generate a meter factor in less than 10,000 meter pulses.
How can the Honeywell Enraf flow prover be used on
Corriolis and UltraSonic meters?
By slowing the prover down to allow for longer run up time, the
flow disturbance caused by the internal valve closure will have had
enough time to stabilize and generate accurate repeatable readings.
What is ‘Run up time’? The run up time is the time it takes from the release of the piston to
reach the start measurement switch. (1st Optical Switch)
Why is the upstream and downstream volume
the same?
The Honeywell Enraf flow Prover has a piston shaft on both sides
of piston body therefore the displaced volume is the same.
How does the flow prover measure volume pulses? The Honeywell Enraf prover does not measure anything. It is a very
accurate, but simple instrument that waits for a start signal from
the flow computer and sends back the pulses as it passes the
volume switches.
Can the fluid flow through the prover all the time? Yes, many Honeywell Enraf provers are installed in “Standby
Mode”, but it is recommended to consider the more durable
elastomer option when operating a prover in this way. This is the
best practice for fluids that are at temperatures higher or lower
than ambient continuous to allow for faster warm up time.
How much pressure drop does the Honeywell Enraf
Flow Prover Have?
Under normal operating conditions the prover will generate 28 - 69
kPa (4 – 10 psi) pressure drop at maximum flow rate. This is based
on water and is applicable to refined products such as diesel,
jet, gasoline, etc. Products such as heavy crude oil can generate
pressure drops of up to 20psi in some cases.
What motor sizes are used on Honeywell
Enraf provers?
It depends on the prover model but in general an 05 uses
0.5hp/.35kW electric motor; 15, 25, 35, & 50 use a 1hp/.75kW
electric motor; 85 uses a 2hp/1.5kW electric motor; 120 uses
5hp/3.7kW electric motor.
What are the installation considerations for a
Honeywell Enraf prover?
Correct installation of the Honeywell Enraf prover is vital to a long
and trouble-free operation. Critical elements include suitable
foundations, pipe stress and load analysis on provers inlet and
outlet ports, adequate upstream filtration and thermal pressure
relief. If you have any questions, please consult the factory.
How is the installed base of Honeywell Enraf
provers supported?
Honeywell Global Technical Support (GTS) is the focal point for
all Honeywell Enraf related after-sales support questions and
GTS is supported by a network of Honeywell service centers and
strategically positioned service partners.
How can I receive information and support for the
Honeywell Enraf prover?
Contact your local sales specialist. There is a Honeywell Enraf
specialist located in each global region (Americas, Asia Pacific and
Europe Middle-East & Africa - EMEA).
Table 4: Frequently Asked Questions.
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