Back Nuts Description Female threaded back nuts are generally used to secure threaded pipework and fittings to bulkheads and tanks. No special tools are required. Approvals Imperial solvent weld PVC fittings are generally manufactured in accordance with EN1452-3. Threaded PVC fittings are generally manufactured in accordance with BS21, DIN2999, ISO7. All fittings have WRAS approval and are suitable for use with potable drinking water applications. Pressure Rating PVC solvent weld fittings (sizes 1/2" to 8") have a pressure rating of 15 bar (215 psi) at 20oC. PVC threaded fittings (1/2" to 4") have a pressure rating of 12 bar (170 psi) at 20oC As temperature increases the pressure rating is reduced. PVC systems should not be used where temperatures exceed 60oC. Sizing - Solvent Weld Pipe & Fittings Imperial (inch) PVC pipe and fittings sizing is not straightforward. They are sized by their nominal bore or approximate inside diameter. The following table details pipe outside diameters (o.d.) for each imperial size. The inside diameter (i.d.) of the socket end of the corresponding fitting will be the same as the outside diameter of the pipe. Pipe Size 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4" Outside Dia mm 21.4 26.7 33.6 42.2 48.3 60.3 75.2 88.9 114.3 Sizing - BSP Threads The following table details approximate thread diameters for male BSP threads. Nom Pipe Size 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4" Thread Dia mm 21.0 26.4 33.2 41.9 47.8 59.6 75.2 87.9 113.0
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