*1.2.6. Air distribution manifolds*

The supply pipe work inter-connecting the five pressure vessels is of 6 inch inside pipe di‐ ameter pipe. There is a 6 inch branch to the supersonic tunnel. Gas dynamics rigs in the Aer‐ odynamics Laboratory are supplied from two 4 inch pipe manifolds, one wall mounted and the other suspended from the ceiling. A four inch line, reducing to 3 inch, supply air to the Hydraulics Laboratory.

Maximum intermittent flow rates are about 10 lb/sec through the 6 inch branch supplying the supersonic tunnel and 4 lb/sec through the 4 inch manifolds. At these flow rates, the pressure drop between reservoirs and manifold outlets does not exceed about 3 psi. The hy‐ draulics Laboratory supply system permits an intermittent flow rate of about 5 psi.

A 2 inch dump line is provided, together with a control valve and attenuating duct silencer to empty the storage vessel contents or to permit an adjustable air bled for stabilization purposes.
