Which pump is used to inject additives into the water stream?

• A. Dosing Pump
• B. Mixing Pump
• C. Additive Pump
• D. Transfer Pump

Answer: (C)

Understanding how chemicals are added to a fire protection water stream is key. The device that injects a controlled amount of chemical into the flowing water is called an additive pump. Its job is to meter and introduce additives directly into the water stream so the chemical concentration stays within the desired range as the water moves through the system. This is different from simply moving water from one place to another (transfer pump) or thoroughly mixing chemicals in a tank or vessel (mixing pump). It’s also distinct from a dosing pump in name, but the function—precisely injecting additives into the live water flow—is what the additive pump is designed to do. Therefore, the additive pump is the best match for injecting additives into the water stream.