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.
reduce confidence in the final margin of safety(2)*demonstrated by the test, and such failures will certainly add significantly to the cost of the test and the time out of service. With careful weighing of the benefits and limitations nevertheless, some pipeline operators will be able to use hydrostatic testing as a means of integrity assessment. The objective of this presentation is to show how such testing might be used to assess the integrity of existing gas pipelines. CALCULATING THE TECHICAL BENEFITS