.2 Filter
For flanged meters, a °Gasket-filter" can be inserted directly upstream of the meter at the place of
the standard gasket. These gasket-filter are available from DN 40 to DN150.
4.3 External dryer cartridge
For severe weather conditions, a replaceable dryer cartridge can be installed on the meters DN50 to
DN150 during manufacture.
. 4 Flanges
Flange DN50 PN16 or ANSI125 can be delivered to adapt a meter DN 40 (thread connection) to
flanges connections DN50. This gives a flange-to-flange distance of 171 mm.
5 Start-u
5.1 General
The procedure of start-up is always dependent on the installation configuration.
Before pressurising the meter, the lubrication procedure should be performed. Pressurisation or
depressurisation should be carried out with very low pressure change. The pressure change should
not exceed 0.3 bar/5 P.S.I. per second.
After start-up, please check the tightness of the installation.
The proper installation and functioning of the meter can be verified by a visual control of the
totaliser (to check that the meter runs properly) and by measuring its pressure loss while running
though the use of Pete's Plugs may allow this pressure loss to be measured while the meter is
pressurised (up to 20 bar).
5.2 Installation with by-pass: See Annex 9
START-UP:
Begin with all valves closed.
- Slowly open the by-pass valve to pressurise the downstream piping.
- When the pressure is balanced downstream, slowly open the small upstream valve V1. The
pressure variation should not exceed 0.3 bar per second.
- When the pressure is balanced in the meter, slowly open the main upstream valve and then
close V1.
- Slowly open the downstream valve and check that the meter starts to register the flow.
- Gradually, close the by-pass valve. Check that the flow rate doesn't exceed the capacity of the
meter.
SHUT DOWN:
- Slowly open the by-pass valve and then close the upstream and downstream valves on the
meter line.
- Carefully open the small bleeder valve V2 and depressurise the meter. The pressure variation
should not exceed 0.3 bar per second.
- Some gas still inside the meter and the pipe, therefore sufficient ventilation is required.
5.3 Installation without by-pass: See Annex 10
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