P&IDResources / Symbols / P&ID symbols / Piping and fittingsUpdated 29 Oct 2026

Pipe cap symbol

Also called End cap

A pipe cap is a welded or screwed fitting that closes the end of a pipe permanently.

Pipe cap P&ID symbol
Pipe cap symbol, as drawn on a P&ID

What the pipe cap symbol means

A pipe cap is a welded or screwed fitting that closes the end of a pipe permanently.

How it is drawn

A small half circle or a closed end on the pipe.

The pipe cap symbol in each standard

US legend (PIP PIC001)

Drawn as on most US-style legend sheets.

Not in ISO 10628-2
ISO 10628-2

ISO 10628-2 has no separate symbol for this. Check the project legend sheet.

German (DIN): Rohrkappe. See DIN P&ID symbols.

Where you see it on a P&ID

On dead ends, headers and drains.

Frequently asked questions

What does the pipe cap symbol look like on a P&ID?

A small half circle or a closed end on the pipe.

What is a pipe cap used for?

A pipe cap is a welded or screwed fitting that closes the end of a pipe permanently. You will find it on dead ends, headers and drains.

Is the pipe cap symbol the same in ISA and ISO?

ISO 10628-2 has no separate symbol for this. Check the project legend sheet. Companies vary the details, so always check the legend sheets at the front of the P&ID set.

What is the pipe cap called in German?

Rohrkappe. On a German R&I-Fließschema it is drawn to DIN EN ISO 10628-2.

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