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PVC-U

PVC-U pressure pipes are manufactured from unplasticised polyvinyl chloride polymer (a thermoplastic material) using the extrusion process. PVC-U pipes were introduced into Australia in the early 1960's and is now widely accepted for use across many applications. Their high strength weight ratio together with exceptional resistance to corrosion or chemical attack make these pipelines ideal for major infrastructure applications.

Material Properties

Mechanical Properties
Property Value & Unit
Density (Specific Gravity) 1.47
Ultimate Tensile Strength 52MPa
Yield Strain 5.5%
Compressive Strength 66MPa
Tensile Modulus 3200MPa
Hardness Shore D 85
Poisson's ratio 0.38
Design Stress ≤DN150=11.0 MPa >DN150=12.3 MPa
Ring Bending Modulus (50yrs) 1200MPa
Thermal Properties
Property Value & Unit
Coefficient of thermal expansion 70 x 10-6/oC
Thermal conductivity 0.138W/m.k
Specific heat 1045 J/kg/oC
Vicat Softening Temperature >70oC
Allowable Operation Temperature 50oC

Fire Resistance Properties

Property Value & Unit
Flammability Will not support combustion
Ignitability-AS 1530* 7
Smoke Development - AS 1530* 9
Spread of flame - AS 1530 * 0
Heat evolved - AS 1530* 2

*AWTA Product Testing, test repot" number 7-558788-CV

Electrical Properties

Property Value & Unit
Volume resistivity 1016 ohm.cm (60% RH)
Superface resistivity 1013 - 1014ohm
Power factor 0.015 - 0.020 at 20 0C
Dielectric constant 3.4 - 3.6 at 250C(60 HZ)

 

Temperature Effect On Pressure Rating

PVC-U pipes are suitable for service temperatures between 0°C and 50°C. For temperatures above 20°C, provision must be made for pressure re-rating in accordance with the table below:

Thermal re-rating factors*

Maximum service temperature (°C) Multiplication factor for pressure re-rating
20 1.00
25 0.94
30 0.87
35 0.78
40 0.70
45 0.64
50 0.58

*Based on ISO 4422-2 Pipes and fittings made of un-plasticized polyvinyl chloride (PVC-U) for water supply Part 2: Pipes (with or without integral sockets)

Chemical Resistance

PVC-U pipes have high resistance to a wide range of chemical reagents. Such resistance, however, is a function of temperature, concentration and pressure.

In general, PVC-U is suitable to convey strong acids, alkalis and aqueous solutions (except those which are strongly oxidising), aliphatic hydrocarbons, fluorides, photographic and plating solutions, brine, mineral oils, fats and alcohols. The suitability of a pipeline for conveying a certain chemical will depend on such factors as the concentration of the chemical in the fluid to be conveyed, temperature, flow rate, the presence of pockets or “dead spots” in the pipeline and other factors.

View the Iplex Chemical Resistant Tool