Jumat, November 11, 2011
Rabu, Oktober 05, 2011
0 Komentar Diposting oleh : Widya Prasetya Time : 10/05/2011 07:23:00 PM
Based on API 650 Para 8.6 Vacuum Testing.
8.6.1. Vacuum testing is performed using a testing box approximately 150mm (6in) wide by 750mm (30in) ling with a clear window in the top, which provided proper visibility to view the area under inspection. During testing, illumination shall be adequate for proper evaluation and interpretation of the test. The open bottom shall be sealed against the tank surface by a suitable gasket. Connection, valves, lighting and gauges as required, shall be provided. A soap film solution or commercial leak detection solution applicable to the condition shall be used.
8.6.3 A partial vacuum of 21 Kpa (3lbf/in², 6 in Hg) to 35 Kpa (8 Lbf/in², 10 in Hg) gauge shall be used for the test. If specified by the purchaser, a second partial vacuum test of 56 Kpa (8 lbf/in, 2/16 in.Hg) to 70 Kpa (10 lbf/in, 2/20 in.Hg) shall be performed for the detection of very small leaks.
8.6.5 The vacuum box test shall have at least 50mm (2 in) overlap of previously viewed surface on each application.
8.6.8. The vacuum shall be maintained for the greater of either at least 5 second or the time required viewing the area under test.