"There is very little that frustrates a tenant of a sprinklered building more than leaking pipes. In today's illustration, a leak at the joint between the pipe and fitting caused someone to apply putty as a stop-gap measure. Repair guidance for situations like this is found in National Fire Protection Association (NFPA) 25, 'Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems'. The property owner or designated representative is responsible for correcting or repairing deficiencies or impairments found during the inspection, test, and maintenance required by the standard. NFPA 25 also requires that corrections and repairs be performed by qualified maintenance personnel or a qualified contractor."
Coffee Break Training - Fire Protection Series No. FP-2011-18
United States Fire Administration: http://www.usfa.fema.gov/