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Definition, Quantifying and Gauging of Tightness

Received: 22 June 2016     Accepted: 25 June 2016     Published: 24 August 2016
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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.

Published in International Journal of Energy and Power Engineering (Volume 5, Issue 4-1)

This article belongs to the Special Issue Xu’s Sealing and Flowing Theories of Fluids

DOI 10.11648/j.ijepe.s.2016050401.14
Page(s) 31-34
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2016. Published by Science Publishing Group

Keywords

Pressure Energy, Pressure's Sustainability, Sealing Law, Sealing Theorem, Tightness, Leak Resistance

References
[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.
Cite This Article
  • APA Style

    Xu Changxiang. (2016). Definition, Quantifying and Gauging of Tightness. International Journal of Energy and Power Engineering, 5(4-1), 31-34. https://doi.org/10.11648/j.ijepe.s.2016050401.14

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    ACS Style

    Xu Changxiang. Definition, Quantifying and Gauging of Tightness. Int. J. Energy Power Eng. 2016, 5(4-1), 31-34. doi: 10.11648/j.ijepe.s.2016050401.14

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    AMA Style

    Xu Changxiang. Definition, Quantifying and Gauging of Tightness. Int J Energy Power Eng. 2016;5(4-1):31-34. doi: 10.11648/j.ijepe.s.2016050401.14

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  • @article{10.11648/j.ijepe.s.2016050401.14,
      author = {Xu Changxiang},
      title = {Definition, Quantifying and Gauging of Tightness},
      journal = {International Journal of Energy and Power Engineering},
      volume = {5},
      number = {4-1},
      pages = {31-34},
      doi = {10.11648/j.ijepe.s.2016050401.14},
      url = {https://doi.org/10.11648/j.ijepe.s.2016050401.14},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.s.2016050401.14},
      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.},
     year = {2016}
    }
    

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  • TY  - JOUR
    T1  - Definition, Quantifying and Gauging of Tightness
    AU  - Xu Changxiang
    Y1  - 2016/08/24
    PY  - 2016
    N1  - https://doi.org/10.11648/j.ijepe.s.2016050401.14
    DO  - 10.11648/j.ijepe.s.2016050401.14
    T2  - International Journal of Energy and Power Engineering
    JF  - International Journal of Energy and Power Engineering
    JO  - International Journal of Energy and Power Engineering
    SP  - 31
    EP  - 34
    PB  - Science Publishing Group
    SN  - 2326-960X
    UR  - https://doi.org/10.11648/j.ijepe.s.2016050401.14
    AB  - 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.
    VL  - 5
    IS  - 4-1
    ER  - 

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Author Information
  • Zhejiang China Valve Co. Ltd., Wenzhou, Zhejiang, 325024, China

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