ISO 7685:2019
Glass-reinforced thermosetting plastics (GRP) pipes — Determination of initial ring stiffness
This document specifies methods for determining the initial ring stiffness of glass-reinforced thermosetting plastics (GRP) pipes. Two methods are given (constant load and constant deflection), and within the specified deflection limits, each is equally valid and can be used for any diameter.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
5.1 Compressive-loading machine
5.2 Load application surfaces
5.2.1 General arrangement
5.2.2 Plates
5.2.3 Beam bars
5.3 Dimension-measuring instruments
6 Test pieces
6.1 Preparation
6.2 Number
6.3 Determination of dimensions
6.3.1 General
6.3.2 Length
6.3.3 Wall thickness
6.3.4 Mean diameter
7 Conditioning
8 Procedure
8.1 Test temperature
8.2 Positioning of the test piece
8.3 Application of load and measurement of deflection
8.3.1 General
8.3.2 Method A: Using constant load
8.3.3 Method B: Using constant deflection
9 Calculation
10 Test report
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
5.1 Compressive-loading machine
5.2 Load application surfaces
5.2.1 General arrangement
5.2.2 Plates
5.2.3 Beam bars
5.3 Dimension-measuring instruments
6 Test pieces
6.1 Preparation
6.2 Number
6.3 Determination of dimensions
6.3.1 General
6.3.2 Length
6.3.3 Wall thickness
6.3.4 Mean diameter
7 Conditioning
8 Procedure
8.1 Test temperature
8.2 Positioning of the test piece
8.3 Application of load and measurement of deflection
8.3.1 General
8.3.2 Method A: Using constant load
8.3.3 Method B: Using constant deflection
9 Calculation
10 Test report