Choosing the Standards:

Qplast pressure uPVC pipes are used for:

Potable Water
Irrigation
Forced Main Sewer
Condensate Drainage Pipes

Pipes and fittings are manufactured to the following standards:

BS 3505
BS EN 1452 – METRIC
DIN 8062
ASTM D 1785 / ASTM D 2665

BS EN 1452 (Imperial) & BS 3505

Pressure pipes and fittings that form the Qplast Pressure System (‘QPS’) are used for cold liquid transport. QPS is manufactured under the old Imperial British Standard BS 3505 as well as under BS EN 1452 the new European Norms under the British Standard (metric and imperial). QPS is produced in Dark Grey (RAL 7011), as follows:

In addition to the third party long term type testing of all products, the following batch release or “routine” tests are carried out as standard:

Keyword: HPT – Hydrostatic Pressure Test; HRT – Heat Reversion Test; DCMT – Dichloromethane Test; VST – Vicat Softening Test

BS EN 1452 (Metric)

In addition to the third party long term type testing of all products, the following batch release or “routine” tests are carried out as standard:

Keyword: HPT – Hydrostatic Pressure Test; HRT – Heat Reversion Test; DCMT – Dichloromethane Test; VST – Vicat Softening Test

DIN 8062

In addition to the third party long term type testing of all products, the following batch release or “routine” tests are carried out as standard:

Keyword: HPT – Hydrostatic Pressure Test; HRT – Heat Reversion Test; DCMT – Dichloromethane Test; VST – Vicat Softening Test

ASTM D 1785 / ASTM D 2665

ASTM D 1785 and ASTM D 2665 covers SCHEDULE 40 and 80 for water distribution and irrigation systems, forced sewer & condensate drain. Colours are available in Dark Grey RAL 7011 & ASTM D 2665 in White RAL 9016, see the table below:

In addition to the third party long-term type testing of all products, the following batch release or “routine” tests are carried out as standard:

Keyword: HPT – Burst Pressure Test; HRT – Heat Reversion Test; DCMT – Dichloromethane Test; VST – Vicat Softening Test

Choosing the Pressure Ratings:

ASTM D 1785 and ASTM D 2665

Maximum operating and required minimum bursting pressures at 73°F (23°C) for PVC pipes according ASTM D1785 “Standard Specification for Poly Vinyl Chloride (PVC) Plastic Pipes Schedules 40 and 80” are indicated in the table below:

Key conversion: 1 psi (lb/in²) = 6,894.8 Pa (N/m²); 1 inch = 25.4 mm.

NB! The maximum operating pressures lowers as the temperature increases see below.

Effect of Temperature on Pressure Rating

uPVC pressure pipes are suitable for use at service temperatures up to 60˚C. However, we must take into consideration the design of the working pressure since this will be reduced as the ambient temperature increases.

Mechanical properties of uPVC are temperature dependent. Nominal working pressures are determined at 20˚C. For lower operating temperatures, the 20˚C ratings are used, even though properties such as tensile strength are greater. As the temperature decreases, it is advisable to take additional care to avoid impact damage as the impact strength decreases with temperature zero degree Celsius and below.

To compensate for operates temperature above 20˚C it is necessary to apply “de-rating factor” in the design. In the case of BSEN 1452 the de-rating factor (fT) for the service temperature to 45˚C can be determined from the graph below.

If we are considering a PN 15 pipe to work at 45˚C, the de-rating factor of 45˚C is 0.63, so that the maximum allowable operating pressure at 45˚C in the frequent use is 0.63 x 15 bar = 9.43 bar. Here the service period also plays a vital role in the design criteria. See below Table P7

For some applications, which need additional de-rating factor for e.g. more safety than the overall service (design) coefficient of 2 or 2.5 an additional factor (fA) can be chosen at the design stage.

The allowable working pressure in continuous use can be determined from the formula: (PFA) = fT x fA x [PN] Where: PFA is the allowable operating pressure; fT is the de-rating factor for the service temperature between 25˚C to 45˚C; fA is the de-rating factor related to the application; [PN] is the nominal pressure.

BS 3505

In compliance of BS 3505, the dimensional specifications under this standard are as follows:

BS EN 1452 – Metric

These pipes are manufactured confirm to BS EN 1452 for water supply under pressure range 6 to 25 bars. The dimensional specifications under this standard are as follows:

DIN 8062

The following table illustrates the dimensional specifications in compliance with DIN 8062 standard.

ASTM D 1785 / ASTM D 2665

The following table illustrates the dimensional specifications of ASTM D 1785 / ASTM D 2665 between Schedule 40, Schedule 80 and “Drain, Waste and Vent” pipes.