Page 42 - Gi flipbook April 2018

IGEM NEWS | Technical Services Update

IGEM’s Technical Services team brings you all the news of their latest activities
and the standards to look out for in the near future

STANDARDS IGEM/UP/11 Gas STANDARDS DUE TO and distribution
RECENTLY installations for educational BE PUBLISHED SOON IGEM/SR/22 Purging
PUBLISHED establishments IGEM/TD/101 Adoption of operations for fuel gases in
IGEM/GL/2 Planning of gas IGEM/TD/4 PE and steel pipe systems by a GT – transmission, distribution
transmission and storage gas services and service management of UIP and storage
systems operating at pipework activities IGEM/UP/9 Gas turbines
pressures exceeding 16bar IGEM/GL/6 Permitry for the IGEM/GM/7A Electrical and supplementary and
IGEM/GL/9 Natural gas safe flow of gas connections for gas metering auxiliary fired burners
supply in an emergency IGEM/UP/6 Application of equipment IGEM/GL/1 Planning
compressors to natural gas IGEM/GM/7B Hazardous distribution systems
DRAFTS AFTER fuel systems area classification for gas IGEM/UP/16 Design for
COMMENT IGEM/GL/4 Gas system metering equipment natural gas installations on
IGEM/UP/1 Strength testing, assets – risk management industrial and commercial
tightness testing and direct IGEM/GM/4 Flowmetering STANDARDS STARTED premises with respect to
purging of industrial and practices (>38 bar and IGEM/TD/12 Pipework hazardous area classification
commercial gas installations <100 bar) stress analysis for gas IGEM/PRS/40 Medium
IGEM/UP/1A Strength IGEM/UP/21 Liquefied industry plant pressure meter installation
testing, tightness testing and natural gas fuelling stations IGEM/G/6 Gas supplies to kits
direct purging of small low IGEM/IG/3 Safe recovery of mobile dwellings IGEM/PRS/41 Medium
pressure industrial and a LNG road tanker IGEM/SR/16 Odorant pressure meter installation
commercial gas installations systems for gas transmission kits

Revised metering standards now available

hazardous area deemed to be NE
• Minor errors in drawings updated/
corrected
• Updated contractual requirements
• Document reviewed regard to
industry comments relating to
operator difficulties with installation
(e.g., installation of AMR and pulse
splitters, etc).

The scope of work in IGEM/GM/7B
included, but was not restricted to:
• Incorporating the concept of NE
• Pros and cons of removing ATEX
certification for LP meters discussed
TWO REVISED METERING standards and application of electronic devices to • Data recalculated for the software
are now available: IGEM/GM/7A monitor metering installations have to enable new zone tables to be
Electrical connections for gas metering moved on at a pace and there was also produced
equipment and IGEM/GM/7B a need to update IGEM/GM/7A. • Removal of requirement to classify a
Hazardous area classification for gas The scope of work in IGEM/GM/7A zone 2 area inside a meter house roof
metering equipment. included, but was not restricted to: space unless the entire enclosure is
These two standards were published • Changes to electrical specifications rated at zone 2. This removes the
in 2008 and the industry, along with e.g., 10Hz burst, increased values need for Exd (etc.) lighting
research, has since moved on. and pulsing (hi start, low • Smaller zone 1 (250mm) at a
Following research undertaken by continuous) currents for reed’s creep because small creeps have
the Health and Safety Laboratories at wetting currents. The panel smaller flow
Buxton, IGEM/SR/25 Edition 2 in 2010 discussed the difficulties (or • Considered how to handle small
introduced the concept of hazardous otherwise) of the Ui value of 10V for creeps inside a meter housing
area zones of negligible extent (NE) Ex ib and Ex ia certification • Special conditions added for
and less conservative zoning distances • Known pulse specifications/electrical small meter boxes including
in many cases. issues that may be causing downwards pointing vents
This meant IGEM/GM/7B was out of difficulties were reviewed (compare non-ideal with danger
step with the latest science available • Agreement and clarification of of vandalism) and MP, <1.5m
3
to the industry. The changes in the use installation of equipment in volume to be deemed zone 2. ■

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