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52 Seal Replacement
Section 4: Maintenance Operating and maintenance instructions
January 2015 3-9008-701 Rev J
measured in kPa, the Modulus of elasticity for stainless steel will be 196,500,574.5,
206,842,710 for carbon steel, and 200,000,000 for 2205duplex stainless steel.
t is the wall thickness of the flow tube. Be sure to use identical units of measure for the
thickness as used for the diameter of the flow tube.
Vtp must be calculated for each set of data collected during each measurement cycle of the
water draw procedure.
The downstream base volume will be the average of the corrected volumes (Vtp’s) of the
downstream cycles of the water draw. The repeatability of the downstream corrected volumes
must be within.02%, see formula below. Enter the downstream base volume into the operating
computer if the meter under test is located downstream of the prover.
The upstream base volume will be the average of the corrected volumes (Vtp’s) of the upstream
cycles of the water draw. The repeatability of the upstream corrected volumes must be within
.02%, see formula below. Enter the upstream base volume into the operating computer if the
meter under test is located upstream of the prover.
4.4 Seal Replacement
Should the seals within the Compact Prover ever need to be replaced, the procedures in this
section will guide the qualified technician through a simple step by step process. Before
attempting any repair or disassembly procedures, the following details must be observed:
• Disconnect power to the operating computer and the prover. This will prevent
accidental power up of the prover hydraulics and electronics.
• Disconnect, or isolate, the prover from the process line (pressure and flow).
• Drain all fluid from the flow tube by opening the drain and vent valves located at the top
and bottom of the end flanges on each end of the flow tube. Dispose of any process
fluids in an environmentally safe manner.
4.4.1 Measurement Piston and Flow Tube
To determine if the measurement piston seals need inspection for possible replacement,
perform the leak test as described in Section 4.1. If line product is leaking from either end of the
flow tube (between the flow tube and end flanges), the flow tube seals in the end flanges are in
need of inspection for possible replacement.
There are two methods for measurement piston and flow tube seal replacement. Procedure A
will be necessary if a complete tear-down of the prover is required. Procedure B will be necessary
if only the piston and flow tube seals are in need of replacement.
Procedure A: Piston and Flow Tube Disassembly
Reference Figure 7-2, Section 7: Parts list.