What is a sprinkler identification number and what does it mean?
Beginning in January of 2001, all manufacturers were required to assign a five digit alpha-numeric code called the sprinkler identification number (SIN) for each sprinkler. This was to comply with the marking requirements stated in paragraph 3-2.2 of NFPA 13, 1999 edition. The SIN number can be compared to Reliable technical bulletins to verify the model, deflector style, K-factor and thermal sensitivity of the sprinklers. Reliable SIN numbers begin with either “R” or “RA” and are followed by four numbers. The first two numbers identify the last two numbers of the Reliable technical bulletin associated with that sprinkler; the last two numbers identify the deflector style and the K-factor range, respectively. All SIN numbers are located on the sprinkler deflector. “Pintle” screws (small metal protrusion extending above or beyond the sprinkler deflector), which were used to identify sprinklers using other than standard orifice/thread combinations, will be phased out.
