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I agree with you, but I have seen in renovation drawings that adressed' relocate the sprinkler head. Is relocation of the sprinkler head without separating from the fitting allowed?

Found this in NFPA 13-2007: 24.2 Acceptance Requirements. 24.2.1* Hydrostatic Tests. ........... A.24.2.1 The use of noncombustible compressed gas to increase the pressure in a water-filled system is an acceptable test procedure.

Thanks for reply, It is pre-Action system. 24.2.2.1 In addition to the standard hydrostatic test, an air pressure leakage test at 40 psi (2.8 bar) shall be conducted for 24 hours. Any leakage that results in a loss of pressure in excess of 1½ psi (0.1 bar) for the 24 hours shall be corrected.

can anyone tell me that if it is acceptable to do hydrostatic test only with air after modification to sprinkler system. since the existing facility is a data centre, it is risky to do hydrostatic test with water. Thanks

Thanks to both Zesti and berkshire. I will take a look at that article.

I am thinking of having both, tail exhaust pipe and exhaust from service pit before tail exhaust hook up to the car exhaust.

Do you know any criteria for service pit exhaust? cfm/sq.ft or airchange? any reference? Appreciate for any help.

Basically our client wants to move to new warehouse without any changes which impossible, the least that shall be done is to protect all columns or instead changing all sprinkler heads to ESFR and installing in rack sprinklers. still need more assesment of water supply. I don't think they move...

Existing Sprinklers are not ESFR, they have k=16.8 and 68C rating.

Thank you stookeyfpe, I am not going to design the system though I have done some sprinkler design. one of our client is concidering to move from a warehouse which can pile up to 12ft to a new warehouse (18ft height) to be able to pile up to 15ft. new ware house is sprinklered and been designed...

Hi, appriciate if anyone can clarify the following for me: nfpa 13-2007-table 18.4(a)require the following for a tire storage-open portable rack-12 to 20 ft piling height: 0.6 gpm/sqft for 5000 sqft AND 0.9 gpm/sqft for 3000 sqft and water supply shall fulfill both requirements. does...