Cell biology (formerly called cytology, from the Greek ÎºÏÏÎ¿Ï, kytos, vessel) is a branch of biology that studies the different structures and functions of the cell and focuses mainly on the idea of the cell as the basic unit of life.
(B) For a cylinder having a water capacity over 12 pounds-- (1) By hydrostatic test without determination of expansion (modified hydrostatic test method). A retest must be performed 12 years after the original test date and at 7-year intervals; or (2) By hydrostatic test using the water jacket method. A retest must be performed 12 years after the original test date and at 12-year intervals thereafter.
if the specification you ve been given is to perform a hydro test at 16 bar then that should be 1 5 times the design pressure of 10 67 bar per b31 3 a pneumatic test should therefore be performed not at 16 bar but at 1 1 times the design pressure or 11 7 bar run the pneumatic pressure only as high as 11 7 bar