Positive displacement pump symbol
Also called Reciprocating pump, Piston pump
A positive displacement pump traps a fixed volume of liquid and pushes it out, so its flow barely changes with pressure. It suits high pressures, viscous fluids and metering.
What the positive displacement pump symbol means
A positive displacement pump traps a fixed volume of liquid and pushes it out, so its flow barely changes with pressure. It suits high pressures, viscous fluids and metering.
How it is drawn
A circle with a piston and rod drawn inside, or a rectangle cylinder with a piston, depending on the legend.
The positive displacement pump symbol in each standard
Drawn as on most US-style legend sheets.
Pump, reciprocating piston type. ISO has no single positive displacement symbol. Each type has its own mark inside the pump circle: piston X8094, diaphragm X8095, gear 8091, screw 8092, progressive cavity 8093.
ISO SVG
German (DIN): Verdrängerpumpe. See DIN P&ID symbols.
Where you see it on a P&ID
On chemical injection, metering, high-pressure and viscous services, always with a relief valve on the discharge.
Tag codes
The positive displacement pump is commonly tagged:
- P
- chemical injection pumps often CIP
Tag formats follow the project numbering procedure. For instruments, the letters follow ISA 5.1, explained on the instrument symbols page.
Related symbols
Frequently asked questions
What does the positive displacement pump symbol look like on a P&ID?
A circle with a piston and rod drawn inside, or a rectangle cylinder with a piston, depending on the legend.
What is a positive displacement pump used for?
A positive displacement pump traps a fixed volume of liquid and pushes it out, so its flow barely changes with pressure. It suits high pressures, viscous fluids and metering. You will find it on chemical injection, metering, high-pressure and viscous services, always with a relief valve on the discharge.
What tag does a positive displacement pump have?
It is commonly tagged P, chemical injection pumps often CIP. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the positive displacement pump symbol the same in ISA and ISO?
No. ISO has no single positive displacement symbol. Each type has its own mark inside the pump circle: piston X8094, diaphragm X8095, gear 8091, screw 8092, progressive cavity 8093. The ISO 10628-2 registration number is X8094. Always check the legend sheets at the front of the P&ID set.
What is the positive displacement pump called in German?
Verdrängerpumpe. On a German R&I-Fließschema it is drawn to DIN EN ISO 10628-2.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016