(Sun 1st Jun 2008)
The Engineering Technical Letter (ETL) is the UK standard for the protection of military aircraft hangars. Firemain have a recent track record in protecting hangars in conjunction with the sprinkler contractor Argus Fire (www.argusfire.com) at both RAF Fairford and Lakenheath using the ETL.
NFPA 409 has been the standard of choice in hangar protection for many years. However, the continued concern over firewater run-off with any foam system has prompted the use of high expansion foam. Hi Ex uses a great deal less water in operation but it's important to understand the special parameters of the ETL.
Rather than calling for a specific application rate in terms of litres per minute per square metre (lpm/m2/min.), the ETL measures performance by the total coverage achieved within both 1 minute and 4 minutes. This requires the use of highly efficient foam generators mounted at roof level capable of expansion ratios of 1000:1. This produces a very dry expanded foam that will readily flow around the footprint of parked aircraft. Indeed, the standard calls for 90% coverage within 1 minute and a 1 metre depth within 4 minutes. The Firemain design has easily achieved compliance.
A full discharge test is required on commissioning and we can provide photographs of our previous successful tests.
The Hi Ex is normally supported by a roof level sprinkler system and we have worked closely with our LPC sprinkler contractor partners as a sub contractor on the overall fire protection contract. As always, we will support your offer with pre tender design and accurate costings.
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