HHE 2022-2023

873 Sixteen ABS PIPE FITTINGS DESCRIPTION ABS (acrylonitrile butadiene styrene) is an extremely robust thermoplastic pipework system, used by many industries in systems for food and beverage production, sewerage and water treatments, etc. ABS is extremely resistant to impact, with good resistance to chemicals, is non-toxic, conforming to the toxicological requirements of the British Plastic Federation, Bristish Biological Research Association Code of Practise for Food Usage 45/5, and EEC requirements for plastic materials in contact with foodstuffs. These systems are light, strong and simple to fit using solvent cement. ABS products are clearly identified by their light grey colour. Has good resistance to a wide range of diluted inorganic acids, organic acids, salts, animal fats and oils but ABS is NOT resistant to organic solvents, alcohol, petrol, acetic acid or vegetable oils. MANUFACTURING STANDARDS ABS products are generally manufactured in accordance with the following standards: Primeline pipe – BS5391 Part 1 Fittings – BS5392 Part 1 Threaded fittings – BS21, DIN2999, ISO7 SPECIFICATIONS Unless otherwise stated ABS pressure fittings have the following pressure ratings: * All quoted at 20°C Solvent weld – 1/2” to 8” = Class E/15 bar 10” = Class D/12 bar Threaded = Class D/12 bar 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. ABS systems should never be used for temperatures in excess of 70°C. The following chart gives a rough guide to the pressure / temperature relationship of ABS pipework systems. 20 30 40 50 60 70 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0 Temperature (°C) Maximum continuous 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 following recommended maximum spacing are for ABS pipes operating under the following conditions: 1. Fluid density of not more than 1g/cm 3 2. PN15 pipe 3. Horizonal pipe runs SPACING GIVEN IN METRES DIMENSIONS IN MM NOMINAL BORE 20°C 50°C 70°C NOMINAL BORE MEAN OD PIPEWORK SUPPORT CENTRES 3/8” 0.8 0.5 0.4 – – 1/2” 0.9 0.6 0.5 1/2” 21.4 3/4” 1.0 0.7 0.6 3/4” 26.7 1” 1.1 0.8 0.7 1” 33.6 1 1/4” 1.2 0.9 0.7 1 1/4” 42.2 1 1/2” 1.3 1.0 0.7 1 1/2” 48.3 2” 1.4 1.1 0.8 2” 60.3 2 1/2” 1.5 1.2 0.8 2 1/2” 75.2 3” 1.6 1.2 0.9 3” 88.9 4” 1.8 1.3 1.0 4” 114.3 5” 2.0 1.5 1.1 5” 140.2 6” 2.1 1.6 1.2 6” 168.3 8” 2.3 1.8 1.5 8” 219.1 For vertical pipe runs, spacing should be increased by 50%.