BS ISO 10804:2018 pdf free.Restrained joint systems for ductile iron pipelines – Design rules and type testing.
4.1 All restrained joints for ductile iron pipes, fittings and other components shall be designed in accordance with this clause. If the design of a restrained joint has been tested and successfully used for a minimum of 10 years, a type test as described in Clause 5 is only required for a significant change in the design which could adversely affect the performance of the restrained joint.
4.2 The minimum thickness of the spigot for restrained joints shall allow any necessary welding or loading from attachments (e.g. gasket teeth). This may result in a pipe thicker than the corresponding pressure class thickness of the pipe. The manufacturer shall declare the pipe thickness for their restrained joints.
4.3 The design safety factors with respect to failure against axial forces due to internal pressure shall
be such that the joints shall withstand a type test of 1,5 times the allowable operating pressure (PFA)
pIus 5 bar (5 x 105 Pa).1)
4.4 The joints shall be type tested to a negative pressure of 0,9 bar (9 x 104 Pa) below atmospheric pressure [approximately 0,1 bar (104 Pa) absolute pressure]. When the restraining mechanism and sealing component of a restrained joint are independent, such a joint does not need to be subjected to a negative internal pressure test if the unrestrained version of the joint has passed this test (see ISO 2531).
4.5 The joints shall be type tested to a cyclic internal hydraulic pressure as follows:
a) 24 000 cycles;
b) test pressure of between PMA and (PMA — 5) bar.
4.6 Ductile iron pipelines and the restrained joints defined in this document are well suited for use in seismic zones. However, certain locations such as fault crossings, liquefaction zones and connections to structures require specialized designs. The pipe manufacturer or a competent earthquake engineer should be consulted.
4.7 For joint restraint components, the protection against aggressive soils shall be at least as good as that of the pipes and/or fittings. It may be achieved by means of works-applied coatings and/or site- applied protection systems.
Each restrained joint design shall be tested in order to demonstrate its mechanical strength and its leaktightness under the most unfavourable condition of casting tolerances and joint movements.BS ISO 10804 pdf download.BS ISO 10804 pdf download.
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