Rank: Super forum user 
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We currently use FM 200 as the suppression medium in our 4 computer rooms and the cylinders are now ready for pressure testing . - This is a very expensive exercise to be carried out on a regular basis at around £7000 per cylinder. Do colleagues utilise any other method of suppression or just rely on their fire risk assessment to give reasons not to install such a system, or do you just bite the bullet and use FM 200
Thanks
SBH
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Rank: Super forum user
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Sorry we use the same system ourselves
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Rank: Super forum user 
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We have an argonite system ourselves - I can give you the details of the people who do our pressure testing if you pm me.
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Rank: Super forum user 
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We are installing hypoxic air (HA) systems when the current suppression systems are coming to the end of their shelf life.
The HA system we use doesn't reply on cylinders - no no nasty pressure test surprises - as it converts ambient atmosphere into nitrogen before pumping it into the protected space. The nitrogen displaces the O2 and a sophisticated monitoring system maintains a level of 15% O2, at which concentration level, combustion can not be sustained but staff can still breath.
Backed up by a aspirating fire detection system and a number of beefy CO2 extinguishers to cover any breakdowns, we are well happy with the change to HA
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