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SEMI F18-95 © SE M I 1995 1 SEMI F18-95 GUIDE FOR DETERMINING THE HYDROSTATIC STRENGTH OF, A ND DESIGN BA SIS FOR, THERMOPLA STIC PIPE AND TUBING 1 Purpose To identify a te st method for measurin g the hydrostatic streng…

SEMI F17-95 © SEMI 1995, 2004 3

10.1.4 Heat code identification. Tubing, component

tube stubs, and fittings made from tubing shall be mill-

and heat-traceable and permanently etched for

correspondence to the applicable mill test reports,

10.1.5 Surface roughness certification,

10.1.6 Microscopic surface condition certification

(SEM),

10.1.7 Surface chemistry certification (ESCA), and

10.1.8 Surface depth profile certification (Auger).

NOTICE: SEMI makes no warranties or

representations as to the suitability of the standards set

forth herein for any particular application. The

determination of the suitability of the standard is solely

the responsibility of the user. Users are cautioned to

refer to manufacturer' s instructions, product labels,

product data sheets, and other relevant literature,

respecting any materials or equipment mentioned

herein. These standards are subject to change without

notice.

By publication of this standard, Semiconductor

Equipment and Materials International (SEMI) takes no

position respecting the validity of any patent rights or

copyrights asserted in connection with any items

mentioned in this standard. Users of this standard are

expressly advised that determination of any such patent

rights or copyrights, and the risk of infringement of

such rights are entirely their own responsibility.

International), 3081 Zanker Road, San Jose, CA 95134. Reproduction o

the contents in whole or in part is forbidden without express written

consent of SEMI.

SEMI F18-95 © SEMI 19951

SEMI F18-95

GUIDE FOR DETERMINING THE HYDROSTATIC STRENGTH OF, AND

DESIGN BASIS FOR, THERMOPLASTIC PIPE AND TUBING

1 Purpose

To identify a test method for measuring the hydrostatic

strength of thermoplastic pipe and tubing, a method for

estimating long-term hydrostatic strength, and

recommendations for developing design bases.

2 Scope

2.1 This guide references the industry-recognized

Standard Test Method for determining the time-to-

failure of plastic pipe under constant internal pressure.

2.2 This guide references the industry-recognized

Standard Test Method for determining the long-term

hydrostatic strength of plastic pipe in order to obtain the

hydrostatic design basis of the pipe material.

2.3 This guide references the Technical Report of

policies and procedures for developing recommended

hydrostatic design stresses for thermoplastic pipe

materials from 23°C to 93.3°C (73°F to 200°F).

3 Referenced Documents

3.1 ASTM Standards

D 1598 — Standard Test Method for Time-to-Failure of

Plastic Pipe under Constant Internal Pressure

D 2837 — Standard Test Method for Obtaining

Hydrostatic Design Basis for Thermoplastic Pipe

Materials

3.2 PPI Technical Report

TR-3/92 — Policies and Procedures for Developing

Recommended Hydrostatic Design Stresses for

Thermoplastic Pipe Materials

4 Terminology

Currently this document contains no terminology.

5 Summary of Referenced D ocuments

5.1 ASTM Standards

5.1.1 D 1598 — This test method consists of exposing

specimens of pipe/tube to a constant internal pressure

while in a controlled environment. Such a controlled

1 American Society for Testing and Materials, 100 Barr Harbor

Drive, West Conshohoken, PA 19428-2959

2 Plastic Pipe Institute, 355 Lexington Avenue, New York, NY

10017

environment may be accomplished by immersing the

specimens in a controlled-temperature water or air bath.

The time-to-failure is measured.

5.1.2 D 2837 — The procedure for estimating long-

term hydrostatic strength is essentially an extrapolation,

with respect to time, of a stress-time regression line

based on data obtained in accordance with ASTM D

1598. Stress-failure time plots are obtained for the

selected temperature and environment: the

extrapolation is made in such a manner that the long-

term hydrostatic strength is estimated for these

conditions.

5.2 PPI Technical Report

5.2.1 TR-3/92 — These policies and procedures are for

development of recommendations for thermoplastic

pipe compounds based on test data from good quality

pipes made by specific processing techniques. These

recommendations may or may not be valid for pipes

made by differing processing techniques.

6 Comments

6.1 The Hydrostatic Stress Committee of the Plastic

Pipe Institute (PPI) has recommended a minimum

safety factor of 200% based on the hydrostatic design

basis. The safety factor is intended to make allowance

for manufacturing and testing variables such as normal

variations in the material, manufacturing process,

dimensions, and in the evaluation procedures (ASTM D

2837 and D 1598).

6.2 Application conditions also need to be taken into

consideration and may require an increased safety

factor. For example, with liquid hydrocarbons and other

chemicals, temperature can have a disproportional

effect on the long-term performance of the tubing or

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 pipe/tube

confirm that the product has been tested per ASTM D 1598, D

2837, and TR-3/92 to ensure a proper pressure rating.

NOTICE: These standards do not purport to address

safety issues, if any, associated with their use. It is the

responsibility of the user of these standards to establish

appropriate safety and health practices and determine

the applicability of regulatory limitations prior to use.

SEMI makes no warranties or representations as to the

suitability of the standards set forth herein for any

particular application. The determination of the

suitability of the standard is solely the responsibility of

the user. Users are cautioned to refer to manufacturer’s

instructions, product labels, product data sheets, and

other relevant literature respecting any materials

mentioned herein. These standards are subject to

change without notice.

The user’s attention is called to the possibility that

compliance with this standard may require use of

copyrighted material or of an invention covered by

patent rights. By publication of this standard, SEMI

takes no position respecting the validity of any patent

rights or copyrights asserted in connection with any

item mentioned in this standard. Users of this standard

are expressly advised that determination of any such

patent rights or copyrights, and the risk of infringement

of such rights, are entirely their own responsibility.

International), 3081 Zanker Road, San Jose, CA 95134. Reproduction o

the contents in whole or in part is forbidden without express written

consent of SEMI.