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Single-Stage vs Two-Stage
What's Best for My Department
When drawing up purchase specifications for pumper fire apparatus, a fire department must choose the type of pumping equipment to be used. Consideration must be given to the pump rated capacity, number of pump stages required, how the pump is to be driven, pump location, the need for pump-and-roll capability, special pump performance requirements, the need for special materials for pump construction (based on local water conditions), the type of pressure control system, the size and location of intake connections and discharge outlets – and the list goes on. These are all important considerations and each one must be carefully studied to ensure that the apparatus will function as intended.
Waterous Discharge Valves
Repair Less Often with Waterous
The effectiveness of a ball-type discharge valve depends greatly upon the tightness of its seal, as a leaking seal allows air to enter the pump during priming, or water to escape when operating. Sand or other abrasive material in the water being pumped can score and roughen the surfaces of the valve parts. The makeup of the ball and seal have the greatest effect on the life and performance of the discharge valve.
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