Fire Safety Installation Pipes

Factory Mutual (FM)

It is one of the largest insurance companies in the world, providing engineering solutions to protect against risks such as fire, natural disasters and similar risks. FM Approvals; FM Approvals is the unit of FM Global that certifies industrial commercial products and services for companies.

Bending Moment Strength

Bending moment tests are applied to the system formed together with the fittings mounted on the ends of the specimens. Pipe ends are prepared by the manufacturer specifically for the fittings. By applying the pressure values determined for the test to the fittings in the specially prepared ends; bending moment under pressure is examined. This test is performed to test the strength of pipes and fittings under a certain load. Connection strength of pipes under pressure is tested.

Rotational Bending Moment Resistance

The assembly groups of each nominal pipe size considered for approval are tested and conformity is verified by this test method. It is verified that there is no leakage, cracking, breakage or pipe deformation before, during and after the rotational bending moment applied under nominal working pressure in the assembly prepared by assembly with approved fittings, and that it remains leak-free while pressurised to nominal working pressure.

Hydrostatic Strength

This test is performed using multiple joints along the same pipe or for separate assemblies for each joining method. Pipe assemblies are subjected to a hydrostatic test at four times the rated working pressure. Each hydrostatic pressure test is conducted for a period of five seconds.

Vibration Resistance

Compliance with the vibration resistance test is verified by testing at least one specimen assembly of each type. The prepared test assembly is subjected to vibration under hydrostatic nominal working pressure for 5 periods of gradually increasing vibration stroke increments every 5 hours. No leakage or other malfunction is permitted during this 25-hour test. The hydrostatic strength test is then repeated after the vibration test of each group of specimens. It is verified that there is no leakage or other failure.

Marking Durability

Pipe markings must remain legible under conditions of storage, transport and use to ensure product identification. The durability and suitability of the marking is therefore verified by immersing the net marked area on a section of the pipe approximately 450 mm in length in water for five minutes once a day for 10 working days. This is routinely repeated daily; after the samples are removed from the water, the marking area is wiped dry vigorously with a cotton or paper towel. If the marking does not smear, overflow or leave residue on the towels, after the completion of the 10-day water exposure test, the markings on the sample are coated with petroleum-based grease and should be kept intact for 24 hours. After this period, the grease is removed from the specimen surface by wiping with cotton or paper towel. It is verified that there is no wiping, staining or other removal of the pipe markings.

Corrosion Resistant Coatings

For hot-dip galvanised coatings, pipe samples for all coated sizes are examined to verify conformity. The samples are cut from a full length of pipe after coating. A total of three samples are taken from the two free ends and from the centre of the full-length pipe, the length of the samples being approximately 600 mm. Measurements are taken at equal intervals around the outer diameter at a distance of approx. 100 mm from the end. A minimum of four measurements around the outside diameter is required for NPS 2 (DN50 - 60.3mm) pipes and a minimum of six measurements is required for smaller pipes, larger than NPS 2 (DN50 - 60.3mm). The sample pipe shall show an average coating thickness of 77 microns (55 g/m2 ) on each sample regardless of the standard from which it is made. The coating thickness shall not be less than 64 microns (0.46 kg/m2 ) at each measured point.