Gas Feed System At Average Pressure - baltur GI 350 ME Instrucciones

GAS FEED SYSTEM AT AVERAGE PRESSURE (see BT 8058 - BT 8530/1 - BT 8531/1)
When high delivery is required, the Gas Distributing Company requests the installation of a unit comprising a
pressure reducer and a meter, and then connects it to the gas pipe network at average pressure (a few bars). This
unit can be supplied by the Gas Distributing Company or by the user, but should be according to the Gas Company's
precise instructions. The unit's pressure reducer should be large enough to supply the maximum gas delivery
required by the burner at the rate of pressure normally estimated for it.
From experience, we would recommend utilizing a
large-scale reducer in order to attenuate the notable
increase in pressure which occurs when the burner
comes to a standstill, with a high delivery.
(Regulations require that the gas valves close in less
than one second).
As an indication, we would advise using a reducer
capable of producing a delivery (m
that of the maximum amount estimated for the
burner. If several burners are to be used, each one
should have its own pressure reducer; this will
enable the gas feed pressure to the burner to be
maintained at a constant level even if only one burner
is operating at the time.
Consequently, it is possible to accurately regulate
the delivery and therefore the combustion, and thus
improve yield. The dimension of the gas pipeline
should be in function with the quantity of gas it has
to deliver. We advise maintaining the load loss at a
low level (not more than 10 % of the gas pressure
value at the burner); it should be kept in mind that
the load loss is added to the pressure existing when
the burner stops and therefore a subsequent start
up will occur at a pressure that rises in accordance
with an increase in the pipe's load loss. Should the
gas pressure reach unacceptable values when the
burner stops (rapid closure of the gas valves), it is
necessary to install between the reducer and the
first valve of the burner an automatic overflow valve
and relative conveying pipe, of suitable section, in
the open air. The end of the conveying pipe in the
open air should terminate in a suitable place, be
protected from rain and have a flame trap.
The overflow valve should be regulated in such a
way as to completely unload excessive pressure.
See diagram n° BT 8058 for gas pipeline dimensions.
Near to the burner should also be fitted a cut-off ball
cock, a gas filter, an anti-vibration joint and a flanged
fitting (see BT 8530/1 and BT 8531/1).
DIAGRAM FOR CALCULATING THE DIAMETER OF THE
PIPES IN RELATION TO THEIR LENGTH AND GAS FLOW
3 /h) about double
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N° BT 8058