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Manual Manifold
4.
Principles of Operation
4.1
General
The control panel line pressure is set in line with table
5 depending on normal operating range and whether
used as a primary supply or as an emergency reserve
system. When the primary supply is functioning
within it's design limits, the backup panel will not
feed gas into the pipeline. If the primary supply fails,
causing the pipeline pressure to fall to the emergence
reserve manifolds (ERM) set point it will automatically
start feeding gas to the pipeline.
Table 5: Typical pressure settings for HTM02-
01 primary and emergency medical gas supply
system, during normal pipeline system operation.
Nominal System Design
Max. Static Pressure Primary Supply
Min. Dynamic Pressure Primary Supply
Max. Static Pressure ERM Supply
Min. Dynamic Pressure ERM Supply
Note - Table 5 shows typical examples. These figures
may differ depending on the hospital's pipeline
management policy.
CAUTION: It is recommended to set the
emergency reserve manifold's (ERM) line pressure at
least 0.2 bar below the main supply source pressure
at full design flow. This is to ensure the emergency
manifold does not supply gas into the pipeline
during normal primary source operation.
4.2
Operation as a primary supply
manifold
4.2.1
For use as a primary supply manifold open all
cylinder valves on the duty bank and close all on the
standby bank (See section 4.6 for cylinder operation)
4.2.2
When the duty bank of cylinders depletes to
the changeover pressure the contact switch on the
cylinder contents gauge will signal the requirement
to change cylinders if connected to a suitable alarm
system.
4.2.3
In response to the requirement to change
cylinders, open all cylinder valves on the standby bank
and close all cylinder valves on the empty bank. The
empty cylinders must then be replaced (See section
4.5 for cylinder handling, and section 4.6 for cylinder
operation).
4.2.4
These steps must be repeated for continuous
supply
2006230.03
4.3
reserve manifold (ERM)
4.3.1
supply (Awareness of the Primary supply failure is
typically from a central alarm system) the ERM line
regulator (see figure 8) should be manually increased
to match the primary supply's nominal values, so that
the full distribution pressure is restored.
4.3.2
valves on the duty bank should be open, and close
all on the standby bank (See section 4.6 for cylinder
operation)
4.3.3
the changeover pressure, the contact switching on the
cylinder contents gauge will signal the requirement
Pressure (Bar)
to change cylinders if connected to a suitable alarm
4
7
11
system.
4.6
8.2
11.5
4.3.4
4.2
7.4
10.3
empty cylinders, open all cylinder valves on the
4.0
7.2
10.0
standby bank and close all cylinder valves on the
3.5
6.5
9.0
empty bank. The empty cylinders can them be
replaced (See section 4.5 for cylinder handling, and
section 4.6 for cylinder operation).
4.3.5
supply.
4.3.6
restored and running reset the emergency manifold
line pressure regulator as per the commissioning
steps in section 3.3.
4.6 are only typical guides, where there are conflicts
with the hospital's emergency procedure, the
hospital's policy will take precedence.
4.4
control panel.
4.4.1
once the commissioning (section 3) is complete and
the system is ready to be put into use.
4.4.2
close all on the standby bank. Correct as required,
see section 4.6 Cylinder Operation.
4.4.3
use. Slowly open the line valve 'A' (see figure 8).
14
Operation as a emergency
In the event of the primary system failing to
For use as a ERM supply manifold all cylinder
When the duty bank of cylinders runs down to
In response to the requirement to change
These steps must be repeated for continuous
Once the primary supply of cylinders is
CAUTION: The following procedures 4.4 to
Procedure to prime manifold
The following procedure must be carried out
Open all cylinder valves on the duty bank and
Ensure the connecting pipeline is ready for
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