When should a two-stage pump be operated in parallel/volume mode?

Prepare for the TCFP Driver/Operator Exam. Use flashcards and multiple-choice questions, each with hints and explanations. Get exam-ready today!

Operating a two-stage pump in parallel or volume mode is primarily intended to meet higher flow demands effectively. This mode allows both stages of the pump to work together, increasing the overall volume of water being moved. When the flow requirement exceeds 50 percent of the rated capacity, utilizing parallel or volume mode maximizes pump efficiency and performance, ensuring that the system can handle increased demand without straining the equipment.

When operating below 30 percent of the rated capacity, the pump may not be able to perform optimally, potentially leading to issues like cavitation. Initial priming typically does not require the pump to be in this mode since the focus is on establishing proper flow and pressure rather than maximizing output. If a pump is idle, it is not actively contributing to flow, making the parallel mode unnecessary.

Therefore, engaging the pump in parallel/volume mode when exceeding 50 percent of its rated capacity is the best practice, ensuring effective operation while meeting high flow needs.

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