In AS2885.5:2020 Field Pressure Testing, Equation N.4(3) is incorrect.
A correction amendment has been issued by Standards Australia, with the equation corrected.
It is provided here, to ensure users of AS2885.5 have the correct information.
Please also note that another correction amendment is underway, for Equation B.1.3(4) and Equation B.2(1). Please make a note of this if you have hard copies. Those with subscription licenses just need to access the latest version online, which will include the revision (not yet for these below though, not until it’s officially issued).