BS ISO 10802:2020 Ductile iron pipelines- Hydrostatic testing after installation.
4 Safety
If not covered by a national regulation, the following specifications shall be implemented.
Related to personnel:
— At all stages of testing, the planned sequence and any variation of operations shall be controlled to avoid danger to personnel.
— All personnel shall be clearly informed of the intensity of the loading on temporary fittings and supports and the consequences if failure occurs.
— Prior to the commencement of operations, a check shall be made so that the appropriate safety equipment is available and that personnel have the correct protective clothing.
Related to works:
— Permanent abutments or anchorages shall be constructed to withstand thrust at the test pressure. Concrete anchor blocks shall be allowed to develop adequate strength before testing begins.
— Care shall be taken to ensure that caps or other temporary blanking fittings are adequately anchored, with the load distributed according to the strength of the supporting ground. Gate valves, fire hydrants, water hammer release equipment nor safety valves should / shall not be used as blanking fittings.
— Any temporary supports or anchorage at the ends of the test section shall not be removed until the pipeline is depressurized.
— After installation and until completion of reinstatement, all excavations shall remain adequately guarded. Work not related to pressure tests shall not be permitted in pipe trenches during pressure tests.
— When performing test, the pipe trench and its surrounding shall be guarded with safety distance. Only inspectors can enter the area to perform their work.
Related to equipment:
— Prior to carrying out a pressure test a check shall be made to ensure that the test equipment is calibrated, is in good working order and correctly fitted to the pipelines.
During the test:
— Air shall be exhausted from the pipeline as fully as reasonably possible. Filling shall take place slowly i” from, if possible, the lowest point in the pipeline and in such a way as to prevent back siphonage and so that air escapes at adequately sized facilities for venting.
— Care shall be taken to fill pipelines with water slowly whilst all facilities for venting are open and the pipelines adequately vented.
— Water used for test shall be able to be drained without flooding or polluting the work site.
WARNING — The test methods described in Clauses 5 and 6 are applicable only for waterpressure testing. They shall in no case be applied for air pressure testing because of the serious safety hazards involved in doing so.BS ISO 10802 pdf download.