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类型SEMI F18-95 GUIDE FOR DETERMINING THE HYDROSTATIC STRENGTH.pdf

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    SEMI F18-95 GUIDE FOR DETERMINING THE HYDROSTATIC STRENGTH F18 95
    资源描述:
    SEM F18-95
    GUIDE FOR DETERMINING THE HYDROSTATIC STRENGTH OF, AND
    DESIGN BASIS FOR. THERMOPLASTIC PIPE AND TUBING
    Purpose
    5.1.1 1 /598-this test method consists of exposing
    To identify a test method for measuring the hydrostatic
    specimens of pipe/tube to a constant internal pressure
    strength of thermoplastic pipe and tubing, a method for
    while in a controlled environment. Such a controlled
    estimating long-term hydrostatic strength, and recom-
    environment may be accomplished by immersing the
    mendations for developing design bases
    specimens in a controlled-temperature water or air
    bath. The time-to-failure is measured
    2 Scope
    5.1.2 2837- The procedure for estimating long
    guide ref
    rences the industry-recognized term hydrostatic strength is essentially an extrapola
    Standard Test Method for determining the time-to-fail-tion, with respect to time. of a stress-time regression
    ure of plastic pipe under constant internal pressure
    line based on data obtained in accordance with ASTM
    D 1598. Stress-failure time plots are obtained for the
    selected temperature and environment: the extrapola
    Standard Test Method for determining the long-term tion is made in such a manner that the long-term
    hydrostatic strength of plastic pipe in order to obtain hydrostatic strength is estimated for these conditions
    the hydrostatic design basis of the pipe material
    5.2 PPI Jechnical Report
    2.3 This guide references the Technical Report of
    icies and procedures for developing recommended 5. 2. I 17-3/92 These policies and procedures are
    hydrostatic design stresses for thermoplastic pipe
    for development of recommendations for thermoplast
    materials from 23'C to 93. 3 C(73F to 200F)
    tic pipe compounds based on test data from good qua
    ity pipes made by specific processing techniques
    3 Referenced Documents
    These recommendations may or may not be valid for
    3.1 ASTM Standards
    pipes made by differing processing techniques
    D 1598 Standard Test Method for Time-to-failure 6 Comments
    of Plastic Pipe under Constant Internal Pressure
    6.I The Hydrostatic Stress Committee of the Plastic
    D 283 Standard Test Method for Obtaining Hydro- Pipe Institute(PP])has recommended a minimum
    static Design Basis for Thermoplastic Pipe Materials
    safety factor of 200% based on the hydrostatic design
    3.2 PP1 Technical Remor?
    basis. The safety factor is intended to make allowance
    for manufacturing and testing variables such as normal
    Tr-3/92-policies and Procedures for Developing variations in the material, manufacturing process,
    Recommended Hydrostatic Design Stresses for Ther-
    nd in the evaluation pi
    (ASTM
    moplastic Pipe Materials
    D2837andD1598
    6.2 Appli
    4 Terminology
    consideration and may require an increased safety fac
    Currently this document contains no terminology
    tor. For example, with liquid hydrocarbons and other
    chemicals, temperature can have a disproportion
    5 Summary of Referenced Documents
    effect on the long-term performance of the tubing or
    5. 1 AST Standards
    pipe. No general safety factor has been established for
    these types of services, so each case should be
    designed on its own merit
    NOTE: It is strongly recommended that the user of
    Mmericansocieny for esting and
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