Pump Discharge Flow Control Loop

This instrument loop diagram shows a basic pump discharge flow-control arrangement. Water leaves the feed tank through a centrifugal pump and passes through the controlled discharge line. FT-101 measures the flow immediately downstream of the pump and sends an electric signal to FIC-101. The flow indicating controller compares that measurement to its setpoint and sends a pneumatic output to FV-101. Moving the valve changes the downstream resistance and therefore the flow delivered to the process. The valve is labelled fail closed, which stops flow if the actuator loses air. This compact loop is useful for instrument design review, commissioning, and technician training. Add alarms, bypasses, minimum-flow protection, and detailed line data when the process requires them.

種類 P&ID規格 ANSI/ISA-5.1-2009 + ISO 10628-1:2014エンジン schematex-pid更新日 2026/9/24

依頼内容

“A pump discharge flow control loop: a feed tank supplies a centrifugal pump, FT-101 measures pump discharge flow, FIC-101 controls fail-closed valve FV-101, and water leaves through the controlled outlet.”

次はこちらAdd a low-flow alarm on the dischargeAdd a pump discharge pressure transmitter

この図に含まれるもの

図の背後にある意思決定を読み解く。

01Measurement

FT-101 reads the pump discharge line.

02Control

FIC-101 compares flow with its setpoint.

03Final element

FV-101 throttles the outlet flow.

04Fail state

The diaphragm valve closes on loss of actuator air.

Use this pattern for a simple liquid-flow loop downstream of a centrifugal pump.

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よくある質問

What does FT-101 measure?

It measures the water flow in the pump discharge line.

What does FIC-101 control?

It adjusts FV-101 to hold the selected flow setpoint.

Why is FV-101 fail closed?

Closing the valve on loss of air stops the controlled flow path.