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Products for the Energy Industry
Haskel has developed a range of specialised mobile gas handling systems
capable of handling sulphur hexafluoride (commonly known as SF6 gas) in
either a liquid or gaseous state. In conjunction with the National Grid
Company PLC, formerly the Central Electricity Generating Board, in the
United Kingdom, our engineers have designed these systems to meet the
varied and growing needs of the world's power generation companies.
What is SF6 Gas? 
Sulphur hexafluoride is commonly known as SF6 gas. Its unique properties
and characteristics make it an excellent insulating gas and gaseous dielectric
within the electric utility industry.
Commonly found in high-voltage power applications, SF6 is used extensively
in circuit breakers and other switch gear. It is also used in linear accelerators,
high-voltage transformers, switches, capacitors and coaxial cables.
It is one of the most expensive of industrial gases and this, together
with the ever-increasing environmental issues, has made the recycling
of SF6 a growing necessity.
Recycling SF6 Gas
While SF6 gas is not a Montreal Protocol Substance, it is very costly
to simply waste the gas when it can be efficiently recovered, cleaned
and returned to the equipment after maintenance work has been completed.
Regardless of he situation and the state of the gas, both equipment and
procedures exist for the complete recovery and purification of the gas
to a position where it can be reused as "new gas."
In the power generation industry, SF6 is generally contained in the high-voltage
equipment and unless. subject to leaks, is prevented from spilling into
the atmosphere. However. while under normal conditions there is no leakage
of the gas, its performance may decline over time due to certain conditions
causing contamination.
Such contamination may be the result of moisture and decomposition products.
At high temperature, during electric arcing for example, SF6 can slowly
decompose. Such decomposure produces by-products which will react with
moisture to produce a variety of substances. These substances, together
with decomposition by-products, can be extremely corrosive and toxic.
Fortunately, if detected in time, such contamination in the gas can be
easily removed utilising Haskel Recovery and Reclaim units. This allows
for the gas to be fully reused after maintenance of the high-voltage equipment.
It also allows for recovery and re-use of gas from equipment ending its
service life, to be transferred to new or replacement equipment.
Irrespective of how much or how little gas is involved, Haskel believes
no SF6 gas should need venting to atmosphere, and offers equipment to
suit any requirement.
Mobile SF6 Gas Carts
Haskel SF6 Gas Carts are designed to evacuate, recover, dry, filter,
clean, store and recharge the purified SF6 gas after maintenance work
on high-voltage equipment.
Haskel offers a choice of five standard models, any of which can be modified
or customised to suit customer specifications. Units include a Haskel
Gas Booster/ Compressor, molecular sieve filters, storage tanks, condenser,
after-cooler for liquifying gas, full mimic control panels with all necessary
gauges, valves, pressure regulators and controls.
Key Features
- Oil free - Non-contaminating, booster/compressor can be operated
dry -no lubrication necessary.
- Economical - Unit handles SF6 in liquid or gas state. No phase
control needed. No heat generated during liquid phase.
- Liquification - Two-stage positive displacement booster/compressor
provides liquification without the need for a condenser.
- Simple - Mimic Control Panel means no special operator skills
required for any operation. Fully mobile, go-anywhere cart.
- Extra filtration - Molecular sieve filters remove toxic corrosive
by-products. Additional filtration provided by transforming from "Reclaim"
to "Re-use" vessel in the liquid state.
- Sampling - Gas sample points provided to measure dew-point,
acidity and 02 content.
- Quality - Manufactured to ISO 9001 (BS 5750 pt. 1). Approved
by National Grid PLC, United Kingdom.
- Technical support - World-wide technical support by Haskel
subsidiaries and fully trained distribution.
- Safe - Designed using Haskel's long and proven experience in
handling gases at high pressure.
- Fast pay-back - Capital costs rapidly repaid by total recycling
of expensive gas.
Selecting a SF6 Gas Cart
Haskel Mobile SF6 Carts are all designed to conduct the same basic operation.
Correct selection of a cart depends upon the operational time required
(i.e., recovery, purification and cooling time) and the storage capacity
needed.
Tank size(s) should have sufficient capacity to hold the quantity of
gas contained by the largest H.V. equipment (i.e., circuit breakers) being
serviced.
A number of factors may affect the total operational time such as correct
evacuation procedures, distance between equipment and the cart, etc. Please
consult with your nearest Haskel plant or dealer for assistance with your
particular specification and application.
Products
Optional Modifications
Haskel offers a range of accessory equipment for use in conjunction with
its SF6 carts and systems.
- Gas pressure reducing regulators, valves, filters, cylinders and pressure
gauges.
- Liquid and gas transfer hoses.
- Analytical instrumentation for moisture content, analysis, 02 content,
acidity and decomposition products.
Request Catalogue
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What is SF6 Gas?