Reading The Natural Gas Meter - baltur GI MIST 350 DSPGM Manuel D'instructions Pour L'utilisation

READING THE NATURAL GAS METER

When the burner is operating at the maximum flow rate, check
that the quantity of gas supplied is what is necessary for the boiler
requirements. The net heating value of natural gas is approx. 8550
kcal/cu.m, for other types of gas ask the Distributing Company for
the relevant heating value.
Hourly output must be measured at the meter, obviously make sure
while measuring that no other gas users are operating. If meter
measures the gas output at a pressure no higher than 400 mm.C.A.
it accounts for the value indicated by the meter without corrections.
For a first indication turn on the burner and when it is at its rated
output, detect the gas flow in exactly one minute (difference between
the two readings one minute one after the other).
The difference between the two readings should be multiplied by
sixty in order to obtain the flow per hour (60 minutes). The detected
value is considered a real value if the meter measures at a pressure
equal to or lower than 400 mm C.A., otherwise the detected value
must be multiplied by the correction coefficient as indicated below.
Then, the hourly output (m /h) is multiplied by the heating capacity
3
of the gas, which produces the output capacity in kcal/h that must
correspond or be very close to the boiler requirement (lower heating
capacity for natural gas = 8550 Kcal/m3). Do not permit the burner
to operate for various minutes if the flow rate exceeds the maximum
permitted for the boiler to prevent it from being damaged, therefore
shutdown the burner immediately after the two meter readings.
CORRECTIONS OF THE VALUE
INDICATED BY THE METER
If the meter measures the gas at a pressure above 400 mm.C.A.,
multiply the read value by a correction coefficient. Approximately, the
correction coefficients to use each time based on the gas pressure
in the meter can be determined as follows.
Add 1 (one) to the number that expresses the gas pressure in bar
displayed by the meter.
Example no. 1
Gas pressure in the meter = 2 bar, the multiplication coefficient is
1 + 2 = 3.
Therefore, if the output read at the meter is 100 cu.m/h the read
value must be multiplied by 3 to obtain the real flow rate, which is
100 cu.m/h x 3 = 300 cu.m/h .
Example no. 2
Gas pressure at the meter = 1.2 bar, the multiplication coefficient
is 1 + 1.2 = 2.2.
Therefore, if the output read at the meter is 100 cu.m/h the read
value must be multiplied by 3 to obtain the real flow rate, which is
100 cu.m/h x 2.2 = actual 220 cu.m/h.
Example no. 3
Gas pressure at the meter = 0.3 bar (3000 mm.C.A.) the multiplication
coefficient is 1 + 0.3 = 1.3.
Therefore, if the output read at the meter is 100 m3/h the read
value must be multiplied by 1.3 to obtain the real flow rate, which
is actual 130 cu.m/h.
Example no. 4
Gas pressure at the meter = 0.06 bar (600 mm.C.A.) the
multiplication coefficient is 1 + 0.06 = 1.06.
Therefore, if the output read at the meter is 100 cu.m/h the read
value must be multiplied by 3 to obtain the real flow rate, which is
100 cu.m/h x 1.06 = actual 106 cu.m/h.
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