Instrument air manifold or air distribution manifold is a pipe shaped chamber (manifold) with several branches of outlets for delivering instrument air to multiple consumers such as control valve, actuated valve or other pneumatic operated instrument.
Instrument Air Manifold
The below figure shows the instrument air manifold header arrangement and instrument air supply branches.
The number of outlet of an instrument air distribution manifold may vary depend on the number of nearby pneumatic instrument or valve.
Each outlet is fitted with block valve which could be of ball valve or needle valve type.
Each outlet should have instrument tag number to which the outlet delivered the instrument air.
At the bottom of instrument air distribution manifold, a block valve is fitted for drain purpose.
This drain valve is required during maintenance to bleed the built-up condensed liquid.