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Volume 5, Issue 4-1, July 2016, Page: 31-34
Definition, Quantifying and Gauging of Tightness
Xu Changxiang, Zhejiang China Valve Co. Ltd., Wenzhou, Zhejiang, 325024, China
Received: Jun. 22, 2016;       Accepted: Jun. 25, 2016;       Published: Aug. 24, 2016
DOI: 10.11648/j.ijepe.s.2016050401.14      View  3383      Downloads  109
Abstract
A leakage for fluid in a pressure vessel to flow through its sealing joint to the atmosphere is just like a leakage for electric charges in a capacitor to flow through its insulator to the ground, and hence there is a sealing law for pressure vessels that is completely similar to Ohm's law, stating the leakage current IL flowing through a sealing joint of pressure vessels is directly proportional to the pressure difference p between its two ends and inversely proportional to its leak resistance RL, or IL = p/RL. Thus it can be known according to the sealing law that the tightness or leak resistance (RL = p/IL = pt/C) is the product of pressure p and time t expended on leaking a unit cubage of fluid through sealing joints under a fixed pressure p and can be gauged according to the sealing theorem RL = p(p – 0.5Δp)Δt/(ΔpC), and the greater the value of p/Δp, the shorter the time required to observe, or the closer to being done at a constant pressure and temperature the test, and the more accurate the test result, where p is the test pressure, Δt is the time expended on the pressure decay from p to (p – Δp), C is the test fluid cubage.
Keywords
Pressure Energy, Pressure's Sustainability, Sealing Law, Sealing Theorem, Tightness, Leak Resistance
To cite this article
Xu Changxiang, Definition, Quantifying and Gauging of Tightness, International Journal of Energy and Power Engineering. Special Issue: Xu’s Sealing and Flowing Theories of Fluids. Vol. 5, No. 4-1, 2016, pp. 31-34. doi: 10.11648/j.ijepe.s.2016050401.14
Reference
[1]
ISO 19879 Metallic tube connections for fluid power and general use — Test methods for hydraulic fluid power connections
[2]
ISO 5208 Industrial valves — Pressure testing of metallic valves
[3]
ISO/TR 11340 Rubber and rubber products — Hydraulic hose assemblies — External leakage classification for hydraulic systems
[4]
XU Changxiang. XU's Sealing Theory and Rectangular & O-Shaped Ring Seals [J]. PETRO-CHEMICAL EQUIPMENT,2013,42(2):78-85.
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