SPIGOT & SOCKET PIPES - LABORATORY TESTS     Product Range  Bends & Junctions  Laboratory Tests  Site Tests  Jointing & Laying  Specification, Handling & Storage   Recommended Trench Width & Bedding Pipes Normal routine tests: carried out on samples for each batch whilst manufacturing, refer to BS 5911 pt 100 Type test: Carried out initially on new joint design or if any changes occur due to wear or new design, but in any case at least once per year.   Hydrostatic Test Fill pipe with water and pressurise to 20psi. Hold for one minute, Pipe to show no signs of leaks Joint Straight Draw Test After pressurising hold for 5 minutes, Joint to show no sign of leaks Joint Deflection Test After pressurising hold for 5 minutes, Joint to show no sign of leaks Joint Shear Test After pressurising and load applied, hold for 5 minutes. Joint to show no sign of leaks 14m Head of Water = 1.4 BAR = 0.14N/mm2 = 20 P.S.I. All of the above tests are carried out with pipe filled water and pressurised, the pipe or joint should withstand this test with no sign of leaks.   Bending Moment Resistance Test For pipes up to and including DN 300 which are longer than 1.25m Crushing Test See crushing table for applied loads per metre, pipe to sustain its applied work load for 1 minute without developing a crack width greater than 0.25mm. Note: For information on the application of the above pipe crushing test load to design of pipelines, reference should be made to 'Simplified tables of external loads on buried pipelines' (HMSO 1986) and 'A guide to design loadings for buried rigid pipes' (HMSO 1983).