4.1 The construction of an extinguisher should
be designed and manufactured for simple and rapid operation, and ease
of handling.
4.2 Extinguishers should be manufactured to a
recognized national or international standardfootnote, which includes a requirement that the
body, and all other parts subject to internal pressure, be tested:
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.1 to a pressure of 5.5 MPa or 2.7 times the normal
working pressure, whichever is the higher, for extinguishers with
a service pressure not exceeding 2.5 MPa; or
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.2 in accordance with the recognized standard
for extinguishers with a service pressure exceeding 2.5 MPa.
4.3 In the design of components, selection of
materials and determination of maximum filling ratios and densities,
consideration should be given to the temperature extremes to which
extinguishers may be exposed on board ships and operating temperature
ranges specified in the recognized standards.
4.4 The materials of construction of exposed parts
and adjoining dissimilar metals should be carefully selected to function
properly in the marine environment.