1. 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

2. 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….

5. Reserve is manual
Reserve

6.  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

7. Each cylinder can be removed

8. 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

9. 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.

10. 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.

11. 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

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

13. Pipelines

14. 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.

15. 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

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

19. 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

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

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

22. Terminal outlets – collar indexing

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

24. 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.

25. Colour coded hose pipes !!

26. MGMCRI

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

28. MGMCRI

29. MGMCRI – bar codex

30. DISS

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