{"id":27228,"date":"2016-09-21T09:23:13","date_gmt":"2016-09-21T09:23:13","guid":{"rendered":"https:\/\/www.pbctoday.co.uk\/news\/?p=25840"},"modified":"2016-10-12T10:37:53","modified_gmt":"2016-10-12T10:37:53","slug":"new-british-standards-watermist-fire-protection-systems","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/new-british-standards-watermist-fire-protection-systems\/27228\/","title":{"rendered":"The New British Standards for Watermist Fire Protection Systems"},"content":{"rendered":"

The new British Standards for watermist fire protection systems are explained here by Bob Whiteley, Chairman, FSH18\/5 and FIA\/BAFSA Water Mist Working Group<\/h2>\n

Why in 2016 do some see watermist as such a contentious issue? For the most part, this has been because there has not been a British Standard which those in the fire safety community can use. The lack of British Standards for watermist fire protection to date had been seen by some to have provided a \u2018cowboy charter\u2019 in the marketplace. However, the publication of BS8458 covering the domestic and residential use of watermist; and the BS8489 series covering the industrial and commercial application of watermist fire protection is seen as a major step forward in this regard.<\/p>\n

Why British Standards for mist?<\/h3>\n

The work in the European standards body, CEN, has only produced a Technical Specification document which cannot be considered a standard. Also, the UK industry took the view that the CEN agenda did not address UK needs and concerns.<\/p>\n

The development of BS8489 and BS8458.<\/h3>\n

The watermist standard began life in 2006 as a Draft for Development \u2013 DD8489. This, as the name implies, created a provisional standard to allow information and experience to be obtained. Two expert groups were then formed to use industry best practice and who, through team efforts, has created BS8458 and the BS8489 series to reflect industry the current knowledge and experience.<\/p>\n

The BSI Watermist Working Group<\/h3>\n

The Working Group, FSH18\/5, was formed from representatives from FSH18\/2 (sprinklers) and FSH18\/6 (gases) fire committees, plus representatives from the Fire Industry Association (FIA), the British Automatic Fire Sprinkler Association (BAFSA), UK Insurers, the Loss Prevention Council (LPC) and Factory Mutual (FM).
\nFSH18\/5 formed three working groups to work on:
\na. BS8458 the domestic and residential standard for watermist;
\nb. BS8489 series for industrial and commercial watermist;
\nc. Input to CEN TS14972.<\/p>\n

This article will now focus on the key elements of BS8489 Part 1, covering system design and installation.<\/p>\n

BS8489 \u2013 principle requirements \u2013 testing<\/h3>\n

Specific areas within the building can be protected by watermist where relevant fire test protocols exist. The test protocols must be representative of actual conditions, thus:
\n\u2022 Similar fuel;
\n\u2022 Comparable compartment volume;
\n\u2022 Compartment height is comparable;
\n\u2022 Similar ventilation conditions.<\/p>\n

In some instances, these have been carried out in-house by watermist suppliers. However, it is highly desirable for independent third parties<\/a> to carry out the testing and certification. The test facilities are expected to operate a quality system with watermist in their scope of accreditation. The test protocol should be recognised and\/or agreed by all interested parties. The laboratory test record should be published showing what equipment and systems have demonstrated performance and listing the equipment and components for their intended application.<\/p>\n

The successful test results\/ test report would include details of components and parameters used in tests; maximum and minimum nozzles heights and spacing; and minimum flows and pressures to be met or exceeded. These would then be incorporated into manufacturer\u2019s design manual to replicate the system as tested.<\/p>\n

These requirements, in themselves, represent a major step forward in providing the information needed for decision makers to make an informed choice regarding the use of watermist and those suppliers with the necessary capabilities. BS8489 principle requirements \u2013 Protection<\/p>\n

BS8489 principle requirements \u2013 Protection<\/h3>\n

Watermist systems may be engineered to provide either local application or volume protection with design parameters established by representative fire tests.<\/p>\n

Local Application: extinguishing systems designed for object protection with design parameters established by representative fire tests. This enables protection of discrete hazard objects within a larger, and possibly, unprotected enclosure.<\/p>\n

Volume Protection: (either via open nozzles or automatic, frangible bulb operated nozzles) are systems designed for hazards within a volume i.e. creating a protected enclosure. Depending upon the application and testing the systems may be designed to provide fire suppression of ordinary combustibles or fire extinguishment of flammable liquid fires.<\/p>\n

BS8489 principle requirements \u2013 duration<\/h3>\n

Extinguishing systems are required to operate for twice the duration to extinguish and prevent re-ignition as established by the test. For suppression systems the requirements are:
\n\u2022 To suit hazard with 60 minutes minimum;
\n\u2022 For automatic nozzle systems, the maximum flow must be based upon the most favourable \u2018Assumed Maximum Area of Operation\u2019 (AMAO);
\n\u2022 System piping must be fully hydraulically designed.
\n\"unfavour\"<\/a>\"favour\"<\/a><\/p>\n

Most unfavourable AMAO\u00a0\u00a0<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0 Most favourable AMAO<\/strong><\/p>\n

<\/h3>\n

BS8489 principle requirements \u2013 components<\/h3>\n

Components should be in accordance with LPS1283\/FM5560 or equivalent.<\/p>\n

Nozzles should be made of corrosion resistant materials and be permanently marked. Open nozzles should incorporate blockage prevention devices, and automatic nozzles have thermal release elements per BSEN12259-1 quick response.<\/p>\n

Piping materials are expected to be stainless steel, copper, or in certain cases galvanised steel with additional protective measures.<\/p>\n

BS8489 principle requirements \u2013 water supplies<\/h3>\n

Water supplies must be capable of supplying both the hydraulically most unfavourable AND the most favourable AMAOs with wholesome\/demineralised\/ deionised\/ sweet industrial water from:
\n\u2022 Towns main;
\n\u2022 One or more automatic starting pumpsets;
\n\u2022 One or more pressurised cylinders.<\/p>\n

The supplies must provide continuity and reliability of supply. Where other than 100% capacity pump suction tanks are used they must have an effective capacity of at least 30% of full capacity AND the infill rate is sufficient to meet discharge duration requirements, and it can be tested to verify performance.<\/p>\n

Dedicated pump houses are required to be constructed with 60-minute fire resistance if forming a separate building, but 120 minutes if adjacent to or within a watermist protected building.<\/p>\n

Pump houses need to include:
\n\u2022 Permanent pump flow\/pressure test facility;
\n\u2022 Pump driver power 110% of rated power demand;
\n\u2022 Pump continuous flow to prevent overheating;
\n\u2022 Pump suction strainer.<\/p>\n

Where multiple pumps are deployed to deliver the required flows and pressures they need to include:
\n\u2022 Common suction;
\n\u2022 Individual pump isolation;
\n\u2022 Sequence starting;
\n\u2022 Starting to ensure sustained system pressure.<\/p>\n

Water supplies using dedicated cylinders must have permanent means to check pressure and water content.<\/p>\n

BS8489 principle requirements \u2013 Annexes<\/h3>\n

The standard includes four annexes:
\na.\u00a0\u00a0 \u00a0Elements of typical watermist systems \u2013 shows typical configurations of pump and tank, pump and towns main, cylinders commonly used for watermist fire systems.
\nb.\u00a0\u00a0 \u00a0Sets out the provisions where enhanced availability is needed for volume protection systems.
\nc.\u00a0\u00a0 \u00a0Provides informative text and diagrams explaining how assumed maximum areas of operation are determined.
\nd.\u00a0\u00a0 \u00a0Sets out the testing requirements for water mist nozzles.<\/p>\n

Fire test protocols<\/h3>\n

Four fire test protocols have been included, as part of the BS8489 series as protocols which will be of general interest and value, however, other, third party accredited protocols may be used with this standard.
\nPart 4 \u2013 For the protection of local applications;
\nPart 5 \u2013 For the protection of combustion turbines and machinery spaces \u2264 80 m3; Part 6 \u2013 For the protection of industrial oil cookers; and Part 7 \u2013for the protection of low hazard occupancies.<\/p>\n

Summary<\/h3>\n

BS8489 and its sister standard BS8458 provide, for the first time in the UK marketplace, a series of standards which reflect the best industry practices for watermist fire engineering. They will assist specifiers, users and fire protection companies ensuring that watermist is used effectively and appropriately where the technology is viable and has been validated. \u25a0<\/p>\n

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
\nBob Whiteley<\/strong>
\nChairman, FSH18\/5 and FIA\/BAFSA
\nWater Mist Working Group
\nFire Industry Association (FIA)
\nTel: +44 (0)203 166 5002
\ninfo@fia.uk.com<\/a>
\nwww.fia.uk.com<\/a><\/p>\n

\n<\/div>","protected":false},"excerpt":{"rendered":"

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