BS ISO 10804:2018 pdf download

BS ISO 10804:2018 pdf download

BS ISO 10804:2018 pdf download.Restrained joint systems for ductile iron pipelines — Design rules and type testing
1 Scope
This document specifies the design rules and type testing for restrained joint systems to be used on ductile iron pipelines complying with ISO 2531 and ISO 7186, in order to determine their mechanical properties and leaktightness.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6708, Pipework components — Definition and selection of DN (nominal size)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6708 and the following apply.
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3.1 restrained joint
joint in which a means is provided to prevent separation of the assembled joint
3.2 allowable operating pressure
maximum internal pressure, excluding surge, which a component can safely withstand in permanent service
3.3 allowable maximum operating pressure
maximum internal pressure, including surge, which a component can safely withstand in service
3.4 type test
proof-of-design test which is performed once and repeated only after change of design
3.5 allowable angular deflection
angular deflection that a joint between two components can safely withstand in service under the allowable operating pressure (PFA) (3.2)
4 Design rules
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) plus 5 bar (5 × 10 5 Pa).
4.4 The joints shall be type tested to a negative pressure of 0,9 bar (9 × 10 4 Pa) below atmospheric pressure [approximately 0,1 bar (10 4 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).