ISO 15738:2002 pdf download

ISO 15738:2002 pdf download.Ships and marine technology -Gas
inflation systems for inflatable life-saving appliances.
On completion of the 18 month period, the two units shall be reweighed and the loss of gas charge on each cylinder shall not exceed 2 % of the original mass of the gas.
5.2.7 Impact test
One of the gas-cylinders and valves used in the long-term leak test, after being fully discharged of gas, shall be dropped 9 times from a height of 300 mm at an angle of 450 onto a concrete floor covered with hardboard so that the valve receives the full force of the impact.
The test shall be repeated with the cylinder angled in a plane at 900 to the original test.
On completion of the above tests, the cylinder shall be stood vertically on its base, and pushed over so that, as it falls, the cylinder valve strikes a steel stop secured to the floor. The height of the steel stop shall be not less than half the diameter of the cylinder used for the test. The test shall be repeated 12 times.
On completion, the valve shall be carefully examined, if necessary using a flaw detector. There shall not be any signs of flaw or fracture other than superficial surface damage.
An approved gas-cylinder, with a mass of at least 8,165 kg, fitted with the cylinder valve shall be dropped three times from a height of 1,5 m onto an aluminium sheet so that the valve takes the full force of the impact at an angle of 60° to the sheet.
The aluminium sheet shall be removed and the test repeated with a single drop onto a concrete floor.
On completion, the valve shall be removed from the cylinder and carefully examined. There shall not be any signs of flaw or fracture other than superficial surface damage.
5.2.8 Torque test
An approved CO2 gas-cylinder shall be valved and devalved in accordance with the instructions of the valve manufacturer. Repeat for a total of six cycles.
On completion, carefully examine the valve threads. There shall not be any signs of stripping or damage.
5.2.9 Salt water exposure test
This test is applicable to combinations of cylinder valve and approved cylinder which are of differing materials, or any aluminium-alloy cylinder valve used with an approved aluminium cylinder.
The complete assembly shall be assembled in accordance with the instructions of the cylinder valve manufacturer, and partially immersed in a 3% sodium chloride solution for a period of 18 months, or alternatively be exposed to a salt water spray (5% sodium chloride solution) at a temperature of 35 °C + 3 °C for 160 h without interruption.
On completion of either of these tests, the mass of the gas charge shall not have been reduced by more than 2 %, and both the valve and operating head shall function in a satisfactory manner.
NOTE This test may be performed simultaneously with the test specified in 6.2.4.
6 Gas-cylinder operating head
6.1 General
The connection between the operating head and the painter or operating cable shall be so arranged that the load is wholly taken by the operating mechanism until the valve has operated. For an operating head intended for use in an inflatable survival craft, means shall be provided so that, when the valve has been opened, the load on the painter is transferred to the towing patch or bridle of the survival craft.
The operating head of an approved cylinder, with a gas capacity of not less than 5 litres, charged with 3,17 kg of CC2, shall fully open with an actuating force not exceeding 150 N and a travel of not more than 200 mm at an ambient temperature of 18°C to 20°C.
The operating head shall be made from corrosion-resistant materials.
An operating head constructed from aluminium alloy shall be anodized and shall comply with 5.1 .4.
Means shall be provided, as necessary, to prevent kinking of the cable and abrasive damage to the fabric of an inflatable survival craft.
The operating head shall be sealed against the ingress of water.
The operating head shall be of a design that prevents any chafing of the fabric of an inflatable survival craft.