Platforms and ladders are frequently supported by direct attachment to a pressure vessel. The normal practice is to provide a sufficient number of clips welded to the vessel’s shell such that the local load transmitted to the shell by any individual clip is not great enough to affect the design of the vessel. This may not always be practical for vessels with a low design pressure and a relatively thin shell. For these vessels, the external load can usually be distributed over a larger area to reduce the stresses developed in the shell, by providing a reinforcing pad on the shell for attachment of the clip. However, it is not advisable to use a reinforcing pad if the operating temperature of the vessel will exceed 450°F, and other design approaches should be investigated.
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