HHE 2022-2023

868 Sixteen uPVC PIPE FITTINGS DESCRIPTION uPVC (unplasticised polyvinyl chloride) is one of the most popular thermoplastic materials used for pipework installations. Lightweight, uPVC has excellent resistance to chemicals and abrasion. It is tasteless and odourless, making it ideal for use with potable water systems and most food products. The extremely smooth bore gives excellent flow characteristics. uPVC products are clearly identified by their dark grey colour. uPVC is resistant to most solutions of acids, alkalis, salts and solvents which can be mixed with water. These products are NOT resistant to aromatic chlorinated hydrocarbons. Connections can be made either by solvent cement or BSP threaded fittings. MANUFACTURING STANDARDS Our uPVC elbows, equal tees, caps, adators and more, are all Kitemark certified. Kitmark Certificate Number: KM 654613 Our uPVC fittings are also WRAS approved. Imperial uPVC products are generally manufactured in accordance with the following standards: Pipe – EN1452-2 Fittings – EN1452-3 / BS4346 Part 1 Threaded fittings – BS21, DIN2999, ISO7 SPECIFICATIONS Unless otherwise stated PVC pressure fittings have the following pressure ratings: Solvent weld – 3/8” to 8” = Class E/15 bar 10” = Class D/12 bar Threaded = Class D/12 bar * All quoted at 20°C Pressure ratings for plastic pipework systems are always quoted at 20°C, it is a fundamental principle of such systems that if the temperature is inclreased then the pressure rating must be reduced. uPVC systems should never be used for temperatures in excess of 60°C. The following chart gives a rough guide to the pressure / temperature relationship of uPVC pipework systems. 20 30 40 50 60 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0 Temperature (°C) Working pressure (bar) Class E Class D Class C In above ground installations it is essential to provide support to ensure that the weight of the pipe and its contents are adequately supported. The recommended maximum support spacing for horizontal runs of uPVC pipe are given in the table below. Spacings are calculated assuming the pipes are carrying water. SPACING GIVEN IN METRES NOMINAL BORE 20°C 25°C 30°C 35°C 40°C 45°C 20°C to 45°C VERTICAL PIPES HORIZONTAL PIPES 3/8” 0.75 0.67 0.60 0.50 0.40 – 0.80 1/2” 0.85 0.77 0.70 0.60 0.50 – 0.90 3/4” 0.90 0.82 0.75 0.65 0.55 0.50 1.00 1” 1.00 0.92 0.85 0.75 0.65 0.57 1.20 1 1/4” 1.10 1.05 1.00 0.90 0.80 0.70 1.40 1 1/2” 1.25 1.20 1.15 1.05 0.95 0.82 1.60 2” 1.40 1.35 1.30 1.20 1.10 0.97 1.80 2 1/2” 1.50 1.45 1.40 1.30 1.20 1.07 2.00 3” 1.65 1.60 1.55 1.45 1.35 1.20 2.20 4” 1.85 1.80 1.75 1.65 1.55 1.37 2.40 5” 2.15 2.10 2.05 1.95 1.85 1.72 2.50 6” 2.25 2.20 2.15 2.07 2.00 1.85 2.50 8” 2.50 2.45 2.40 2.32 2.25 2.12 2.50