Calibration
Part No.: 44200004 - Revision 2
SVP Controller Operation Manual
4-13
1. Be certain that all maintenance that needs to be done to the prover
has been accomplished before starting the gravimetric calibration. It
is advisable to perform a static leak test prior to performing a water
draw, see Section 4.2. Replace the seals on the prover if there is any
doubt as to their integrity.
2. Block prover inlet and outlet by using a blind flanges or double block
and bleed valves.
3. Refer to Honeywell Enraf water draw configuration, Figure 4-7, and
install Honeywell Enraf available water draw kit, see Figure 4-6. Install
certified thermometers and certified pressure gauge, even if the prover
is equipped with P&T transmitters.
If using Honeywell Enraf Water Draw P&T kit, remove the plug in the
wafer spacer and connect the pressure gauge P1 to the opening (see
Figure 4-7 for reference).
The thermometer used to monitor prover fluid temperature T1 is
supposed to be installed into the spare thermowell located on the
downstream side of the flow tube (see Figure 4-7 for reference).
The thermometer used to monitor switch bar temperature T2 is
supposed to be installed on top of the switch bar close to the center
line between two optical switches (see Figure 4-7 for reference).
The thermometer T4 is supposed to be used to monitor ambient
temperature (see Figure 4-7 for reference).
Have available Table 2 to record data from prover calibration using
gravimetric water draw technique.
4. Calibrate the scale as specified in API 4.9.4.
5. Connect water supply to prover, (refer to Figure 4-7)
6. Make sure that the water draw kit is wired to the customer connection
enclosure as specified in the Figure 4-6.
7. Turn water supply on, and open valves V1, V2, V3. After all air is bled
off, close V2 and V3. Open V5 valve and allow water to circulate until
the temperature has stabilized and is not changing.
8. Valve V2 may be opened slightly to allow just a very small stream of
water to flow; this will bleed off air, which may be in the water supply.
9. Calibrate scales with test weights to/- 10% of draw weight per
API 4.9.4.
10. With volume catch container on the scales and under water draw
valve, tare scales.
