Pipe & Fittings
Quadrant Chemplast (Pty) Ltd proudly offers the complete range of GEORGE FISCHER connection systems & flow control, suitable for the safe transport of water, gases and other media in a variety of applications. This wide range consists of high quality components, using plastics. Jointing systems are a core competence common to all areas of activity, providing extensive materials and technological know-how that ensures joints are always leak-proof. Whether it be welding, bonding, clamping, moulding or simply inserting, George Fischer Piping Systems has the ideal technology for a consistently secure connection.
Size range: DN15 to DN500
Materials: ABS, PVDF, PVC-C, PVC-U, PP, PE
Chemical process industry; life science; microelectronics; measurement & control; water treatment; ship building etc.
Plastic pipe dimensions are, by convention, specified by the outside diameter, usually denoted by e. This may be supplemented by stating the nominal inside diameter or DN. Sometimes the pipe wall thickness is specified by the SDR or Standard Dimension Ratio.
SDR = d divided by e.
Where d = the outside diameter (mm)
Where e = the pipe wall thickness (mm)
The pipe size can be calculated as follows:
di = 18.8 √Q1 ÷ v
di = Inside pipe diameter (mm)
Q1 = Flowrate in m3/h
v = Flow velocity, usually 0.5 to 1.0 m/s for suction lines
1.0 to 3.0 m/s for discharge lines.
Material α = mm/mK ABS 0.10 PE 0.15-0.20 PP 0.16-0.18 PVC-U 0.07-0.08 PVC-C 0.06-0.07 PVDF 0.12-0.18
A rough calculation of pressure loss in straight length plastic pipe can be done using,
Δ Pr = λ × (L ÷ di) × (ρ ÷ 2.102) × v2
Δ Pr = Pressure loss (bar)
λ = Pipe friction factor
L = Length of straight pipe (m)
di = Inside pipe diameter
ρ = Liquid density (kg/m3)
v = Flow velocity (m/s)
For smooth bore plastic pipe: λ = 0.02