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.
I am working for a pipeline construction company. I have been in the process and pipeline services since 1999. I joined this company to start a hydrotest division. We are being asked by our customer to conduct a pneumatic test of 7 miles of 20 pipeline. Test pressure is somewhere in the neighborhood of 1300 psi.