BS ISO 21843:2018 pdf free

BS ISO 21843:2018 pdf free.Determination of the resistance to hydrocarbon pool fires of fire protection materials and systems for pressure vessels
The method provides an indication of how vessels protected with fire protection materials or systems perform when exposed to pool fires on solid surfaces. It simulates the thermal loads to a vessel engulfed in a large pool fire through the use of burners to create a flame capable of engulfing a vessel.
To ensure that suitable test conditions are achieved and maintained, it describes calibration tests to be performed prior to fire testing, sets permitted tolerances from the calibrated set-up, and delimits environmental conditions.
This test procedure uses liquid propane fuelled burners to simulate a pool fire. Burners are used because they provide more control over the test conditions. The burner system shall be designed to produce a low momentum and luminous fire of sufficient thickness so that the resulting heat flux is predominantly by radiation (i.e. radiation fraction greater than 75 %).
To simulate pool fire conditions a burner system shall be used. Burners shall be designed to achieve total engulfment and uniformity of heating and shall be present on all four sides of the vessel. The maximum nozzle spacing shall be no greater than 0,5 m.
The burner design can be varied by the test laboratory to meet the calibration requirements; for informative purposes, an example of burner design is shown in Annex A.
The burner arrangement shall be designed to receive equal mass flow rates of propane to two diametrically opposite locations at the ends of the vessel to ensure broadly symmetrical heating.The supply line length and fittings shall also be designed to ensure equal propane flow to the burner arrangement and all supply lines. Cooling of the supply shall be provided as necessary to protect the burner supply for the duration of the test. The burner system shall be designed to ensure stabilization of the flow rate and stabilization of the flame temperatures (as defined by directional flame thermometers (DFTs) in Clause 9 and Annex B) shall be achieved within 2 min of the test commencing.BS ISO 21843 pdf free download.