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FIGURE 8 TEST POST WITH INSTRUMENTATION (LEFT) AND PE SYPHON (RIGHT) FIGURE 9 PE SYPHON IN TEMPERATURE CONTROLLED
LABORATORY TEST

FIGURE 10 INSTRUMENTATION SCHEMATIC FIGURE 11 REMOTE MONITORING SYPHON INSTALLED AT
SPENNYMOOR

Remote monitoring instrumentation installing two prototype remotely Gas Networks receives the differential
A remote monitoring instrumentation monitored syphons. The image in pressure readings, which prompt an
system was designed with the following Figure 11 shows the PE syphon and alert to empty the syphon. A G/23 field
criteria achieved: pressure sensing lines installed at the trial procedure was developed and used
Intrinsically safe Spennymoor site. to install two prototypes. The field trial
IP67 rating Following installation of the remotely successfully demonstrated a more robust
Connectivity (3G, 2G and GPS location monitored syphon, the maintenance method of ensuring security of supply
stamp) requirement to visit site has reduced by whilst increasing maintenance efficiency
Long battery life (>5 years) approximately 90 per cent to less than by approximately 90 per cent.
Compatible software one visit every three weeks. The water
The remote monitoring system uses volume was measured during emptying
an Abriox Pressure Plus data logger with and used to validate the fill level. No REFERENCES
a multi-channel accessory. Channel 1 gas supply interruptions were reported
measures the mains pressure (P1) taken during the trial. IGEM/TD/3 Edition 5, Steel and PE Pipelines for
Gas Distribution, Institution of Gas Engineers and
from a sensing line connected using a top Managers, Kegworth
tee on the gas main. Channel 2 measures Conclusions NGN/PM/LC/16, Management Procedure for the
the pressure from a syphon sensing line A G/23 field trial procedure was Management of Water Content in Gas (Wet Gas),
(P2) terminating within the syphon tank. developed which combines GIS April 2006
analysis with strategic use of portable NGN/PM/G/23 Management Procedure for the
Testing and qualification hygrometers for the identification of Evaluation and Approval of Products, Equipment
and Techniques up to 7bar
A range of tests were developed to water ingress and/or accumulation Smith B., Report Number 9253-1 Field Trial G23 for
model the effects of network pressures, locations within the gas network. A Portable Hygrometer (2018).
water volumes, length of pressure suitable hygrometer was identified and BS 78-2:1965, Specification for cast iron spigot and
sensing pipe, and temperature. The test equipment designed and assembled socket pipes (vertically cast) and spigot and socket
rig is shown in Figure 9. to enable safe connection to the fittings – Part 2: Fittings, British Standards Institute
The instrumentation schematic for the gas network. A G/23 field trial was BS 4772:1988, British Standard Specification for
laboratory testing is shown in Figure 10. successfully conducted in the village Ductile Iron Pipes and Fittings, British Standards
Institute
More than 30 tests were conducted of Beal for which the main location GIS/PL2-4:2012, Specification for polyethylene
with controlled variables of pressure, of water ingress or accumulation was pipes and fittings for natural gas – Part 4: Fusion
water level, and temperature. The identified. A subsequent leakage survey fittings with integral heating element(s).
test results concluded that the at that location validated the results
instrumentation successfully indicated from the hygrometry assessment. ACKNOWLEDGEMENTS
the water fill level and transmitted the A remotely monitored syphon was
data to a remote system for evaluation. designed and manufactured which uses This project was a collaborative effort supported
by ROSEN and Northern Gas Networks. The author
differential pressure measurements would like to thank the ROSEN UK onshore and
Remote monitoring syphon field trials between the bulk network pressure, and test facility teams for their ideas and contributions,
and also the NGN innovation and operations teams
A G/23 field trial procedure was a sensing line within the syphon tank to for their support throughout the project.
developed and approved before indicate a ‘syphon full’ level. Northern

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