BS ISO 18079-2:2018 pdf free.Ships and marine technology一Servicing of inflatable life-saving appliances Part 2: Inflatable life rafts.
Following the visual inspections in 42, the life raft shall be subject to the following tests at frequencies as described in Annex A. The tests shall be performed in accordance with the manufacturer’s servicing manual.
4.3.2 Gas inflation (GI) test
Gas inflation (Gl) test shall be carried out at five-year intervals, and when undertaking a Gl test, special attention shall be paid to the effectiveness of the relief valves.
The folded life raft shall be removed from its container before activating the fitted gas inflation system.
After gas inflation has been initiated, sufficient time shall be allowed to enable the pressure in the buoyancy tubes to become stabilized and any formation of solid particles of the inflation gas to evaporate.
After this period, the buoyancy tubes shall, if necessary, be topped up with air, and the life raft subjected to a pressure holding test over a period of not less than one hour, during which the pressure drop will not exceed 5 % of the working pressure.
Life rafts associated with a marine evacuation system having been deployed and successfully inflated in conjunction with a rotational deployment in accordance with ISO 18079-4:2018, Clause 7 shall be deemed to have satisfied the gas inflation test.
4.3.3 Necessary additional pressure (NAP) test
Each life raft shall be subjected to the necessary additional pressure (NAP) test at yearly intervals after the tenth year of the life raWs service life unless earlier servicing is deemed necessary as a result of visual inspection.
The life raft shall be removed from its container or valise and from its retaining straps, if fitted.
The life raft shall then be inflated using dry compressed air to a pressure at least equal to the working pressure, or to the pressure required by the manufacturers servicing manual, if higher.
After allowing sufficient time for the life raft to regain fabric tension at worling pressure, then all pressure release valves shall be blocked. Blocking of pressure relief valves shall only be done using the equipment and methods prescribed by the manufacturer and care shall be taken as to not damage the valves.
The pressure shall then be gradually raised using dry compressed air to a pressure to the lesser of two times the working pressure o that sufficient to impose a tensile load on the inflatable tube fabric of at least 20 % of the minimum required tensile strength, i.e. NAP test pressure.
After 5 mm, there should be no seam slippage, cracking, other defects, or significant pressure drop. If cracking in the buoyancy tubes is audible, the life raft shall be condemned; if no cracking is heard, the pressure in all buoyancy chambers shall be reduced simultaneously by removing the plugs from the pressure relief valves.
The life raft shall then be subjected to a pressure holding test over a period of not less than one hour, during which the pressure drop shall not exceed 5 % of the working pressure.
4.3.4 Working pressure (WP) test
At services where a NAP or GI test is not required, a working pressure (WP) test shall be carried out in accordance with Annex A and in accordance with the manufacturer’s servicing manual.
The life raft shall be removed from its container or valise and from its retaining straps, if fitted.
The life raft shall then be inflated using dry compressed air to a pressure at least equal to the working pressure, or to the pressure required by the manufacturer’s servicing manual if higher.
The life raft shall then be subjected to a pressure holding test over a period of not less than one hour, during which the pressure drop will not exceed 5 % of the working pressure.
4.3.5 Floor inspection
The floor, if of an inflatable design, shall be inflated not exceeding the test pressure prescribed by the manufacturer.
The inflated floor shall then be checked for broken reeds and tested in accordance with the manufacturer’s instructions.
The seams between floor and buoyancy tube shall be checked for slippage or edge lifting. Where the insulation required is by means other than an inflatable floor, this shall be inspected for damage, including its secure attachment.
4.3.6 Floor seam (FS) test
Following the test and inspections in 4.3A and 4.3.5, a floor seam (FS) test shall be carried out at yearly intervals after the tenth year of the life raft’s life.
For this test the life raft buoyancy tubes shall be supported by a system which leaves the floor seams unsupported, at a suitable height above the service floor as shown in Figure B.1 (see Annex B).Then, a person weighing not less than 82,5 kg shall walk or crawl around the perimeter of the floor for the entire circumference and the floor seams should be checked again.
Manufacturers may substitute this test with another test which will determine the integrity of the floor seam until the next inspection is due.BS ISO 1 8079-2 pdf download.