NFPA 1901 time limit for drafting or priming on 1500 GPM pumps?

• A. 30 sec
• B. 45 sec
• C. 60 sec
• D. 90 sec

Answer: (B)

NFPA 1901 sets a concrete time limit for getting water to the pump when drafting or re-priming a 1500 GPM apparatus. You must establish prime and start delivering water within 45 seconds of beginning the drafting or priming process. This keeps water flowing quickly, which reduces the chance of losing prime due to air leaks, cavitation, or delays that can overheat or stress the pump.

In practice, this means you should prepare the rig and the drafting setup so that, once you initiate the priming or drafting action, the pump achieves suction and flow within that 45-second window. Times longer than this are not acceptable under the standard, while shorter times aren’t the specified requirement—45 seconds is the guideline you’re expected to meet.