I've got an existing operational industrial building that will have a new sprinkler system installed. As per NFPA 15-2017, Section 10.4.3.1, the spray nozzles must be tested. Read verbatim:
10.4.3.1 The water discharge patterns from all of the spray nozzles shall be observed to verify the following:
(1) Patterns are not impeded by plugging of the nozzles.
(2) Nozzles are properly positioned.
(3) Nozzle discharge patterns are not obstructed from wetting surfaces to be protected as designed.
The problem I have is since this is an existing building and has been in operation for a very long time, it is not feasible for us to test the spray nozzles.
a) This is for a coker building and with the residual coker dust and material present, testing the system would damage existing insulation and equipment.
b) There isn't an opportune time to test as the building is in operation
Item a) is the biggest concern. Are there any alternative methods to test the spray nozzles without testing in the building?