Tag: SF6 leak repair

Issues with leaking SF6 assets? Problem solved with EMT Site Services

Post author By Lisa Redmond
Post date May 17, 2023

EMT Site Services have recently completed work in the UK and overseas, with many more projects scheduled in for spring and summer. We still have dates available to carry out SF6 leak surveys and repairs, so please contact the team if you have a concern regarding leaking assets.

Project Bulletin

A Norwegian utility contracted EMT Site Services to run a series of leak surveys to detect and confirm the presence of SF6 leakage within the work area. Using EMT best practice leak survey methodology and EMT advanced leak detection technology, our team identified and located several SF6 leaks within their installed assets including GIB, HV bushings and interconnecting supply pipework.

The team are now scheduled to undertake 3 leak repairs with composite sealant filler and bonding technique, which will require SF6 gas handling and removal of the gas during repair. In addition to EMT site services, this customer has also expressed an interest in EMT hand held and fixed point detection systems and our Zerowaste analysis technologies.

Our experts were also commissioned to undertake a 132kv bushing repair for a UK utility; which included analysis of existing SF6 gas prior to removal, de-gas of SF6 to auxiliary storage via EMT gas cart, composite repair installation, and re-gas of SF6.

The system was fully tested and signed off as leak-free on completion of works.

Tags EMT Site Services, SF6 Leak Detection, SF6 leak repair

Survey and repair leaking SF6 assets cost effectively and with minimal disruption to operations

Post author By Lisa Redmond
Post date September 21, 2022

EMT delivered the technology and expertise to survey and repair leaking SF6 assets with a cost-effective solution and minimal disruption to operations, which was welcomed by the customer, whose alternative would have been to replace the asset at considerable cost and with significant disruption to the substation – another job well done by the EMT Site Services Team.

Industry: Power T&D

Application: SF6 gas inspection cover plate repairs

Customer: UK electric utility substation

Date: August 2022

Problem: Leaking SF6 gas on cover plates

Solution: SF6 leak repair to inspection plates – non pressurised. 9 repairs completed

Works:

Leak surveyed by EMT Site Services team using EMT Handheld SF6 Leak Detector
Existing gas purity analysed with EMT Zerowaste Rapide+ Analyser
Asset de-gassed using EMT Gas Cart
Surface preparation and cleaning works undertaken
Specialist repair works completed
Asset re-gassed, gas purity checked, and post repair testing completed
Further scheduled preventative maintenance work has been recommended by EMT Site Services due to high H20 ppm readings recorded in the SF6 gas

Tags SF6 Degassing, SF6 leak repair, SF6 Purity Analysis, SF6 Site Services

SF6 Leak Management

SF6 leak repair on vertical flange under live conditions and pressure/outage

Post author By Lisa Redmond
Post date June 29, 2022

Industry: Power T&D

Application: SF6 Leaking Vertical Flange x 3

Customer: UK Electric Utility Substation

Date: April 2022

Problem: To fix three identified leaking/potentially leaking flanges on SF6 substation site

Solution: Vertical REFLANGEKiT® SF6 leak sealing. Flanges repaired under live conditions and pressure/outage

Works:

Leak surveyed/identified using EMT SF6 leak detector
Environmental/climatic conditions surveyed and approved
Surface preparation works undertaken
Cleaning and degreasing of surfaces carried out
Phase one flange repair – soft shell mounting completed; the purpose of the soft shell is to protect the functional parts of the flange i.e. bolts and seals, and to concentrate the leaked SF6 gas to a single point of the shell where the valve is located. This was followed by re-enforcement of the soft shell
Phase two flange repair – hard shell and resin application completed; resin was injected into the hard shell and left to cure overnight
Sleeve removed, valve sealed, and leak test undertaken using EMT SF6 calibrated leak detector, concluded with final seal and post repair testing

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Tags flange repairs, SF6 Leak Management, SF6 leak repair, SF6 Site Services

SF6 Leak Management

Online Repair for SF6 Leaking Flange

Post author By Lisa Redmond
Post date December 7, 2021

SF6 Gas Leak Repair with EMT

Industry: Power T&D

Application: SF6 Leaking Flange

Customer: UK Electric Utility

Date: December 2021

Solution: REFLANGEKiT^® SF6 leak sealing technique

Technology: The 3X ReflangeKit^®concept is based on a composite double shell system that encapsulates the leaking flange. The first shell covers and protects the flange collecting SF6 leaks. The second shell contains specific resin. An exhaust valve allows the SF6 gas to escape during resin injection. After overnight curing of the resin, the valve is closed and sealed giving a 100% seal and leak free composite repair.

Benefits: The installation was non-invasive and did not require a power outage. Repair was completed online and under pressure. Disassembly was easy, the fix was efficient, and cost effective.

Deliverables: Shunts, bolt heads and flange seals are now protected. The completed repair was tested and successful – further repairs are scheduled. Another satisfied customer, and another testimonial for EMT Site Services.

Tags flange repairs, SF6 Leak Management, SF6 leak repair, SF6 Site Services

SF6 Leak Management

SF6 leak detection, management and repair – maintaining, managing and mitigating SF6 leaks

Post author By Lisa Redmond
Post date November 22, 2021

The Issue

SF6 is a global warming gas and the leakage of process gases and liquids from compartments is a global issue. Leakage of SF6 is more than an internal concern and is now a broader ethical obligation, as utility companies commit to carbon neutrality by 2050. As a requirement to report loss rates in line with permitted release rates, leakage of SF6 gas is highly detrimental to achieving this goal. Therefore utilities need an effective preventative maintenance plan for assets to remain operational and to ensure business continuity.

The Task

Reduce the rate of SF6 loss

Reduce costs associated with gas usage and topping up

Reduce costs associated with regulatory body fines

Reduce CO2 footprint

…detection, measurement and repair of SF6 leaks

The Solution

Protective Coatings
Corrosion Control
Leak Surveys
Leak Detection & Quantification
Preventative Maintenance Planning

Temporary Repairs
SF6 Top-up Management

Long Term Repairs
Preventative Repairs
Asset Replacement

Tags SF6 Leak Detection, SF6 Leak Management, SF6 leak repair

Project Portfolio SF6 Leak Management Site Services

Substation B SF6 Leaking Flange Repair

Post author By Lisa Redmond
Post date September 28, 2021
No Comments on Substation B SF6 Leaking Flange Repair

Problem

SF6 substation 3x leaking GIB/GIB flanges.

Repair

Composite encapsulated leak repair – large flange, GIB/GIB straight, large resin fill. Suitable for nuclear and power plant substation installations. Adaptable to various types of flanges. Temperatures ranging from -20°C to +65°C (-4°F to +149°F).

Technology

The 3X ReflangeKit^®concept is based on a composite double shell system that encapsulates the leaking flange. The first shell covers and protects the flange collecting SF6 leaks. The second shell contains specific resin. An exhaust valve allows the SF6 gas to escape during resin injection. After overnight curing of resin, the valve is closed and sealed giving a 100% seal and leak free composite repair.

Benefits

Online & under pressure installation
Non invasive system (no risk of resin intrusion into the flange)
Bolt and screw protection
Easy disassembly
Cost effective installation (costly consignation avoided)

Result

SF6 leak remediation was a success, and the flange is in service today. Another satisfied customer and another environmental win.

Repairs Portfolio

Cover /inspection plates
Cover plates with small bore adapter and pipework
GIB/tank flange
Complex multi flange GIB

EMT Site Services

High level site services working standards
Fully trained site services personnel
All works completed within the designated timeframe or less
100% leak remediation record
The most challenging of SF6 leaking flange/asset styles fixed

Other Site Services

Tags flange repairs, SF6 leak repair

SF6 Gas Leak Repair with EMT

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Repair

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Result

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Based in the UK, with offices in the USA and China, supported by a global distribution network who understand the needs of the industry, EMT is the technology partner delivering practical solutions for utilities maintenance personnel.

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