Overview
ISO 1167-3:2007 - Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance to internal pressure - Part 3: Preparation of components - specifies how to prepare fittings and valve bodies for hydrostatic pressure testing according to ISO 1167‑1. The standard defines the principle of test-piece assembly, requirements for pressure‑tight devices and closures, sampling/conditioning references, and reporting requirements. It complements ISO 1167‑1 (general method) and works together with ISO 1167‑2 (pipe test pieces) and ISO 1167‑4 (assemblies).
Key topics and technical requirements
- Purpose: Prepare single components (fittings, valve bodies) with appropriate seals/connectors for internal hydrostatic pressure testing.
- Test-piece principle: Components are closed, purged of air, conditioned at the specified test temperature and subjected to internal hydrostatic pressure per ISO 1167‑1.
- Pressure‑tight devices: Multiple acceptable joint/closure methods are described, including:
- Joints using pipes and/or end caps (hydrostatic end thrust)
- Mechanical joints using external threads or machined grooves
- Mechanical compression joints using ribbed half‑segments
- Internal metal pins with ring seals to prevent connector expulsion
- Gasketed joints using pins, external frames or half‑segments
- Valve body closures: Specific arrangements for ball valves, diaphragm valves, seat valves and butterfly valves (plugs, O‑rings, metal plates, blind flanges) to allow safe pressure testing of valve bodies.
- Materials considerations: Guidance to avoid introducing additional stresses (notch sensitivity, groove/rib selection), and use of external reinforcing rings where needed.
- Sampling and preparation: Sampling per relevant product standards; assembly at ambient temperature; conditioning period and timing referenced to material specifications or general material requirements.
- Test report: Information required is recorded in line with ISO 1167‑1 (Clause 11), including identification of pressure‑tight device type.
Applications and users
ISO 1167-3:2007 is used for:
- Type and routine testing of thermoplastic fittings and valve bodies to demonstrate resistance to internal pressure
- Product development and validation by manufacturers of PVC, PE, PP and other thermoplastic hydraulic components
- Independent test laboratories and conformity assessment bodies performing hydrostatic strength tests
- Quality engineers, R&D teams, and regulatory/specification writers needing standardized component preparation methods
Related standards
- ISO 1167‑1:2006 - General method for internal pressure resistance testing (primary test procedure referenced)
- ISO 1167‑2 - Preparation of pipe test pieces
- ISO 1167‑4 - Preparation of assemblies (e.g., polyolefin fittings for fusion joints)
- Note: ISO 1167‑3 replaces elements of the earlier ISO 12092:2000.
Keywords: ISO 1167-3:2007, thermoplastics pipes fittings, resistance to internal pressure, hydrostatic pressure test, preparation of components, pressure‑tight devices, valve bodies, test pieces.
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