Hydrostatic Leak Test

 The installation to be tested shall be inspected for compliance with the drawings and specifications.

Significant variations shall be investigated and

corrected, if required, before proceeding with the tests.

a) Before testing ensure that all temporary connections have been made and that only personnel needed for the pressure test are present.

b) All items for test have to be provided on site before the test i.e. pressure gauges, instruments, water etc.

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c) Before taking up pressure testing, each valve in the pipe system will be checked by closing and opening to observe if it is working efficiently (any valve found not working satisfactorily is replaced). Keep open all the in-line valves.

d) Isolate any parts of the system that their pressure rating is less than the testing pressure such as relief valves, automatic air vents and all devices that might be damaged by the test pressure.

e) No pressure shall be applied against the closed gate of gate valves. All valves shall be in the open position but completely back seated during testing. End

valves shall be capped installed by blind flange.

f) No testing shall be carried out against or through the pressure reducing valves. The setting of the pressure reducing valves shall not be changed for testing purposes

g) Plug all the open ends of pipes, keeping only two points open, one at the highest end & ·the other at the lowest end of the pipe section to be checked.

h) Install a gate valve at the highest open end of the pipeline and keep it fully open to act as "air purge point to relieve the trapped air from the pipeline.

i) A "Tee" connection Is installed at the lower end of the pipe. A water pressure gauge with a gate valve & a hydraulic pressure pump are attached to one end of this Tee connection & a gate valve at the other free end of the Tee connection to act as a "Filling Point".

j) Verify pressure gauges for calibration certificates.

Check proper filling and pressurization sequence of piping system to be tested.

k) Fill pipe slowly with water through the filling point. Do not use power-driven pump unless approved.

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l) Fill absorbent pipes with water and allow to stand 24 hours at working pressure.

m) Once all the air in the pipe system is purged through the "purge point" and only water starts flowing out indicating that the pipeline is free from trapped air, shut the air relief gate valve at the top end of the pipeline. Once the pipeline is filled with water shut the gate valve at the filling point too.

n) Now start applying water pressure through hydraulic pressure pump, till the pipeline attains a test pressure of 1.5 times the working pressure for 2 hours.

o) All piping and attached appurtenances subjected to system working pressure shall maintain that pressure without loss for 24 hours. Test pressure shall not exceed maximum pressure for any valve, or other component in system under test.

p) Walk along the pipe line route & Inspect for any leakage. If any leakage is found, drain off the water from the system by opening the filllng point at the lowest end of the system .Rectify the leak by tightening the joint or replacing of defective pipe I fitting as the case may be.

q) The test pressure shall be read from a gauge located at the low elevation point of the system or portion being tested.

r) Once the test has been satisfactorily completed the test pressure shall be released slowly so as not to produce shocks and sudden contractions that might damage the piping.

s) Prepare reports for tests and for corrective action required.

t) Note:Notify Consultant at least 24 hours before Testing must be made. Perform test specified as with the presence of Consultant.

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11.4.14.6 Flushing Procedure

 After approval of installation of pipes and fittings, flushing shall be done for sprinkler system with clean water to remove dust and debris that might have been present during construction works.

 All obstructions, debris and superfluous matters, shall be removed from the pipeline. All piping shall be flushed out before commissioning.

 Items of equipment which would be sensitive to damage during hydro flushing shall be removed, blocked off or isolated.

 Hydrostatic or water flush: use clean, fresh water.

 Install test drain valve to the drain points.

 Provide empty drum or container.

 Provide water supply.

 Provide flow measurement in flushing water supply line to be used as basis for verification of flow velocities in piping system.

 Test drain valve shall be flushed in fully open position at drain points.

 The drain points should be tapp or near the floor drain.

If ever there is no floor drain near the drain point, we can used empty drum or container to stored flush water. Observe proper disposition of flush water.

 All piping systems shall be flushed using high pressurized pump.

 Flushing has to be done by filling the system from one and leaving the bottom valve open at the opposite end with pressurized clean potable water with required flow maintaining 10 ft/sec water velocity to carry out all debris/dirt/slag along with it.

 The flushing operation shall be continued until

satisfactory cleaning is ensured then close all bottom ends.

 Note: Disinfections process in fire fighting is not NFPA requirement, the disinfections chemical material will cause rusting and reactions with steel pipes. Refer to RFI Submission Reference: 421-A000-M-AV-01712 Rev.00. And if ever required by consultant the

disinfections will be prepared by specialist and will be separately submitted.

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11.4.14.7 Interface

 Double knock system shall be with (1) sensing of heat (bulb fuses) by the sprinkler & (2) detection of

smoke/fire through detectors.

 Flame Detector interface to fire alarm system

 Heat Detector interface to the fire alarm system