Although Romano cheese is traditionally made in Italy from ewe's milk (Pecorino) the following recipe is prepared for a 2 gallon version of cows milk (which would technically be called Vacchino Romano).
Strength is usually tested by measuring permanent deformation of the container. Hydrostatic testing is the most common method employed for testing pipes and pressure vessels. Using this test helps maintain safety standards and durability of a vessel over time.
(OP). I have a hydrostatic pressure test for a HWS/R system, 1-1/4 pipe, approx 40 ft in length. Initial test pressure was 225psi and after 4 hours the test pressure increase to 280psi. I'm used to test pressure decreasing due to a leak but never seen test pressure increase by 55psi.