Archive for February, 2011

Circulator Selection

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Circulator Selection

A number of different factors must be considered when selecting circulators for both large and small heating systems. The selection factors include: • Amount of water to be handled • Temperature of the water to be handled • Head against which the pump must operate • Working head of the system • Pump suction head […]

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End Suction Pumps

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End Suction Pumps

End suction pumps are used in the hydronic systems of hotels, stores, theaters, and other large structures. The Bell & Gossett Series VSC pump shown in Figure 10-17 is a double suction unit characterized by a vertically split casing perpendicular to the pump shaft. It is used in hydronic heating and cooling systems, and for […]

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Inline Centrifugal Circulators

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Inline Centrifugal Circulators

An inline centrifugal circulator is another type of pump commonly used in hydronic heating systems of small- to medium-size residential and light-commercial structures. The Bell & Gossett Series 90 inline centrifugal pump shown in Figures 10-15 and 10-16 is an example of this type of pump. It is a close-coupled, low-maintenance unit that can be […]

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Wet Rotor Circulators

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Wet Rotor Circulators

The wet-rotor circulator is also used in small- to medium-size residential and light-commercial hydronic systems (see Figure 10-14). This is a small, close-coupled pump with an integral 40–125-watt motor. It is a sealed pump that does not require lubrication. The wet-rotor pump combines the motor, the shaft, and the impeller in a single assembly housed […]

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