ISO FDIS 19884:2019 pdf free download – Gaseous hydrogen一Cylinders and tubes for stationary storage.
g) type of resin and composition;
h) temperature of the resin;
i) temperature of the liner; and
j) winding angle.
8.2.5 Curing of thermosetting resins
If a thermosetting resin is used, the resin shall be cured after the fibre winding is complete. Thermosetting resins shall be cured by heating, using a predetermined and controlled time- temperature profile.
During the curing, the curing cycle (i.e. the time-temperature history) shall be documented and retained by the pressure vessel manufacturer for the intended life of each batch of pressure vessels.
The maximum curing time and temperature for pressure vessels with aluminium alloy liners shall not adversely affect metal, resin and fibre properties.
8.2.6 Autofrettage
Autofrettage, if used, shall be carried out before the hydraulic test specified in 8.4.1 g). The autofrettage pressure shall be within the limits established in 8.1.1. The pressure vessel manufacturer shall establish the method to verify that the appropriate pressure is applied.
The manufacturer shall monitor effectiveness of the autofrettage by appropriate measurement technique(s), such as a volumetric expansion test.
Records of autofrettage pressure shall be retained by the pressure vessel manufacturer for the intended life of each batch of pressure vessels.
8.2.7 Exterior environmental protection
Exterior protection may be provided by using any of the following:
a) a surface finish giving adequate protection (e.g. metal sprayed on aluminium, anodizing);
b) a suitable fibre and matrix material (e.g. carbon fibre in resin); or
c) a protective coating (e.g. organic coating, paint).
Any coatings applied to pressure vessels shall be such that neither the coating nor the application process adversely affects the mechanical properties of the pressure vessel. The manufacturer shall provide guidance on coating treatment during in-service inspection to ensure the continued integrity of the pressure vessel (e.g. removal of coatings if necessary to carry out the inspection method).
8.3 Qualification of new designs
8.3.1 General
The pressure vessel material, design, manufacturing process and examination shall be proved to be adequate for their intended service by meeting the requirements of the material tests and type tests specified in 8.3.2 and 8.3.3 or following rules given in 8.3.5.
Pressure vessel designs that have been qualified to another standard do not need to repeat tests in this section, but do need to conduct tests that were not included in their prior qualification. See Annex B for specific requirements. Material tests and type tests shall be conducted on each new design, on finished pressure vessels that are representative of normal production, complete with identification marks. If more pressure vessels or liners are subjected to the tests than are required, all results shall be documented. All pressure vessels subjected to type tests shall be made unserviceable after the tests.