The standard specifies two test methods to determine the steam loss of automatic steam traps to ISO 6552. The object of these tests is to determine the amount of live steam, if any, that is lost through the steam trap. They are, therefore, tests to evaluate the ability of the traps to shut against steam during successive operations. There is no measurement of the total heat energy lost by the trap. Such a total heat loss would include radiation and convection components which can be established separately.
DS/ISO 7841:1994 history
1994DS/ISO 7841:1994 Automatic steam traps - Determination of steam loss - Test methods