Transcription of Primary Secondary Pumping Application Manual
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Primary Secondary Pumping Application Manual
TECHNICAL Manual TEH-775 APrimary Secondary PumpingApplication Manual Primary - Secondary BASICS Primary - Secondary Pumping and control circuits are simple in theory and practice. Operation is based on this simple rule: WHEN TWO PIPING CIRCUITS ARE INTER-CONNECTED, FLOW IN ONE WILL CAUSE FLOW IN THE OTHER, T0 A DEGREE DEPENDING UPON THE PRESSURE DROP IN THE PIPING COMMON T0 BOTH. The B&G Monoflo circuit operates on this principle. The Monoflo fitting provides a fixed orifice between the riser connections of the radiation circuit into the main and is installed in piping which is common to both the radiation circuit and the main circuit. Flow in the radiation circuit occurs because of the orifice pressure drop. A typical Monoflo detail is illustrated in Figure 1. Figure 1 TYPICAL MONOFLO CIRCUIT Were the Monoflo fitting removed and the riser tees moved closer togethers , there would be practically no pressure drop between the points of riser connection.
4. Application to heat-cool zone switch-over. PRIMARY-SECONDARY RULES AND DEFINITIONS 1. Location of the Secondary Circuit Pump The secondary pump should always discharge into the secondary circuit. This provides for an increase in secondary circuit pressure over that established in the cross-over bridge by the primary pump.
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