BS ISO 6182-14:2015 pdf download – Fire protection — Automatic sprinkler systems — Part 14: Requirements and test methods for water spray nozzles K-factor for nozzles shall be in accordance with the manufacturer’s design and installation instructions whendetermined by the test method given in 7.3. Each flow constant K (caiculated), shall be within ±5% of themanufacturer’s value,for nozzles having a nominal k-factor of 40 or larger，and ±10% of themanufacturer’s value for nozzles having a nominal k-factor less than 40.. 6.3 Water distribution (see 7.3) When tested as described in 7.3.1 through 7.3.3, a spray nozzle shall produce a spray angle within ±10° of themanufacturer’s published water discharge angles.Other methods of determining nozzle spray angle shall bepermitted to be used provided the same level of accuracy is maintained.Stress Corrosion (see 7.4) 6.4 Stress Corrosion (see 7.4) 6.4.1Stress corrosion for copper alloy parts (see 7.4.1) When tested in accordance with 7.4.1 , each nozzle shall show no cracks, delamination or degradation whichcould affect its ability to satisfy other requirements of this standard. 6.4.2Stress corrosion for stainless steel parts (see 7.4.2) When tested in accordance with 7.4.2, each nozzle shall show no cracks, delamination or degradation whichcould affect its ability to satisfy other requirements of this standard. Note: In some countries, this test is not mandatory. 6.5 Coated nozzles (see 7.5) 6.5.1 Evaporation of wax and bitumen (see 7.5.1) Waxes and bitumens used for coating nozzles shall not contain volatile matter in sufficient quantities to causeshrinkage, hardening, cracking or flaking of the applied coating.The loss in mass shall not exceed 5 % of thatof the original sample when tested by the method in 7.5.1. 6.5.2Resistance to low temperatures (see 7.5.2) All coatings used for nozzles shall not crack or flake when subjected to low temperatures by the method in7.5.2. 6.5.3Resistance to high temperature (see 7.5.3) Coated nozzles shall withstand exposure to increased ambient temperatures without evidence of cracking,flaking, delamination, deformation or melting of the coating, when tested by the method specified in 7.5.3. 6.6 Resistance to heat (see 7.6) Nozzles shall be resistant to high temperatures when tested in accordance with 7.6.After exposure, thenozzle shall not fracture or break. If visual deformation is observed in the water discharge path, it shall meetthe requirements of 6.2. If the nozzle is deformed, water distribution testing shall be conducted in accordancewith 6.3. 6.7 Vibration (see 7.7) Nozzles having multiple components shall be able to withstand the...
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