BS 8663-1 pdf free download

BS 8663-1-2019 pdf free download.Fixed fire protection systems – Components for watermist systems Part 1: Specification and test methods for watermist nozzles.
4.11 Heat exposure (aging) for automatic nozzles
4.11.1 Uncoated watermist nozzles
When tested in accordance with Annex I ([.1), the watermist nozzles shall not operate during the exposure period. When subjected to the additional tests specified in U. the watermist nozzles shall meet the following requirements:
a) when tested in accordance with D4. the watermist nozzles shall operate such that the waterway is cleared; any lodgements shall be disregarded;
b) when tested in accordance with Annex A. the watermist nozzles shall conform to the requirements specified in 4,
c) when tested in accordance with Annex Fl. the watermist nozzles shall conform to the requirements specified in 4.10.
4.1 1.2 Glass bulb watermist nozzles
When glass bulb watermist nozzles are tested in accordance with Annex I (12), there shall be no damage to the glass bulb.
4.12 Thermal shock for automatic glass bulb nozzles
For automatic glass bulb watermist nozzles, when tested in accordance with Annex j, the glass bulbs shall either:
a) break correctly on cooling such that the waterway is cleared; or
b) remain intact, i.e. after immersion, when subjected to a function test in accordance with DA. they shall operate in such a way that the waterway is cleared; any lodgernents shall be disregarded.
4.13 Corrosion
4.13.1 Stress corrosion
Concealed watermist nozzles shall be tested with and without their cover plates assembled. When watermist nozzles are tested in accordance with Annex K (Li or 1(2 as appropriate to the material), then those watermist nozzles in which cracks, delamination or failure ofan operating part is observed, other than the cover plate, shall show no evidence of leakage in the leak resistance test described in Annex H.
After exposure all watermist nozzles shall be subjected to a function test in accordance with DA. The watermist nozzles shall operate in such a way that the waterway is cleared; any lodgements shall be disregarded. In the case of concealed watermist nozzles, the three complete assemblies and the three watermist nozzles without cover plates shall be tested.
Those watermist nozzles which show evidence of cracking, delamination or failure of a non-operating part shall show no visible evidence of separation of permanently attached parts when tested in accordance with Annex B. and the K-factor shall vary less than ±5%.
4.13.2 Sulfur dioxide corrosion
Concealed watermist nozzles shall be tested with and without their cover plates assembled. When watermist nozzles are tested in accordance with Annex K (Ki), then after exposure, when subjected to a function test in accordance with DA, the watermist nozzle shall operate in such a way that the waterway is cleared; any lodgements shall be disregarded.
After the sulfur dioxide corrosion test, when the watermist nozzles are tested in accordance with Annex B. the K-factor shall vary less than ±5%.
4.13.3 Salt mist corrosion
Concealed watermist nozzles shall be tested with and without their cover plates assembled. When watermist nozzles are tested in accordance with Annex K (K.4), then after exposure, when subjected to a function test in accordance with D.4, the watermist nozzle shall operate in such a way that the waterway is cleared; any lodgements shall be disregarded.
Open nozzles which can incorporate a blow-off cap shall be tested in accordance with Annex K (K.4), then after exposure, when subjected to a function test in accordance with D.3, the watermist nozzle shall operate in such a way that the blow-off cap is fully released.
After the salt mist corrosion test, when the watermist nozzles are tested in accordance with Annex B, the K-factor shall vary less than ±5%.
4.13.4 Moist air exposure
When tested in accordance with Annex K (K.5), then after exposure, when subjected to a function test in accordance with D.4, the watermist nozzle shall operate in such a way that the waterway is cleared; any lodgements shall be disregarded.
After the moist air exposure test, when the watermist nozzles are tested in accordance with Annex B, the K-factor shall vary less than ±5%.
4.14 Integrity of watermist nozzle coatings (coating resistance to low temperature) When coated watermist nozzles are tested in accordance with Annex L, any coating (other than decorative coatings) on the watermist nozzle shall not crack or flake.
4.15 Water hammer for automatic nozzles
When tested in accordance with Annex M, watermist nozzles shall not leak. After the test, when subjected to a function test in accordance with D.4, the watermist nozzle shall operate in such a way that the waterway is cleared; any lodgements shall be disregarded.
4.16 Thermal response
NOTE The orientations used for the thermal response tests are:
• favourable orientation, such that the heat responsive element is fully exposed to the airflow;
• unfavourable orientation, with the influence of any yoke arm shadow effect limited to a nominal angle of 25’ each side of the yoke arm.
4.16.1 Response in the favourable orientation
For exposed watermist nozzles, when tested in accordance with Annex N (N.1) in the favourable
orientation, the nozzles shall fall within the response time index (RTI) and conductivity factor (C)
limits as shown in Figure 2.
For non-exposed watermist nozzles, when tested in accordance with Annex N (N.2) in the favourable orientation, watermist nozzles shall have a wind tunnel response time within ±10% of the manufacturer’s declared range.BS 8663-1 pdf download.