Dip. Software based statistics PhD ( physiology), FICA , IDRA Cylinder manifolds Dr. S. Parthasarathy MD., DA., DNB, Dip. Diab. DCA, Dip. Software based statistics PhD ( physiology), FICA , IDRA

The typical configuration consists of two equal banks of gas cylinders (one duty and one stand-by). These are arranged around a central control panel and provide a nominal output pressure of 4 bar….

Reserve is manual Reserve

 All cylinders in each group are connected to the manifold via a copper tail-pipe with a gas specific connection and seal. Each connection has a non-return valve fitted to enable single cylinder to be changed if a leak or tail-pipe rupture occurs. The cylinders are held captive by individual chains to the backbar. Nitrous oxide may be with heaters

Each cylinder can be removed

Alarms a green ‘normal’ condition • a yellow ‘duty bank empty, stand-by running’ condition • a yellow ‘duty bank empty, stand-by low’ condition • a yellow ‘emergency/reserve banks low’ condition • a red ‘pipeline pressure fault’ condition

Pneumatics cause change over It also creates a electric power to cause alarms But cutting the power supply should not cause stoppage of gas supply.

Capacity Normal Oxygen – 6500 litres Nitrous -- 9000 litres Medical air – 5500 – 6000 litres Each bank –minimum 3 days demand Currently an average 800-bed teaching hospital consumes around 500 million L of oxygen/ year.

Oxygen O2 (400 kPa) Nitrous oxide N2O (400 kPa) Entonox 50% O2/50% N2O (400 kPa) Medical air MA (400 kPa) Ours is 8 bar and the stand by starts on decrease to 4 bar

Some safety points Fire proof material No other cylinders Kept upright for ten minutes before manifold Ventilation above and below

Pipelines

Medical gases are distributed throughout the hospital at a nominal 400 kPa through pipelines designed to minimize the pressure drop from source to point of use. This is achieved by means of calculations based on the initial pressure, the specified flow rate and the dimensions of the pipework.

In pipelines Other components Shut off valves Pressure gauges Relief valves Alarms Sizes of pipelines ? In UK 74 starting 54 22 - to theatres 12 to patient In mm pipelines 22 mm 12 mm 10 mm our pipelines

Color coding of pipelines Yellow means inflammable !! Not for air or vacuum Initially made like that

phosphorous de-oxidized non-arsenical copper ‘Half hard’ refers to the heat treatment of copper pipes, which allows them to have a higher pressure rating Pipes are degreased, purged, filled with nitrogen and capped to maintain cleanliness

Area valved service unit Pictures from internet for closed academic purpose only

Pipework is normally always concealed in modern-day installations, though in the past it was mounted on the surface. Hygiene and cleanliness – conceal

Terminal outlets – collar indexing

Push and no twist One hand removal Spring loaded But no leak when it is in or out !!

Flexible hosepipe 1. A quick connect (Schrader) probe that fits the terminal outlet 2. A flexible hosepipe 3. A NIST connection that fits the equipment, e.g. the anaesthetic machine.

Colour coded hose pipes !!

MGMCRI

The non-interchangeable screw thread (NIST) connector Probe Outer and inner Collar size determines Serrated spigots

MGMCRI

MGMCRI – bar codex

DISS

Summary Two sets of cylinders Reserve separate 8 bar – 6500 litres Alarms Pipelines – pressure Sizes and colour coding Terminal outlets