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…