How many sprinklers must be removed from a system for testing?
Section 5.3.1.2 requires that one percent (or no less than four) be removed and submitted to a testing laboratory for evaluation. If a system contains 500 sprinklers for example (400 upright and 100 pendent) then a total of eight sprinklers must be removed; 400X.01=4 and 100X.01=1 (but not less than 4).
