Boston HD

Gas Viscosity Coefficient

It means Working pressure

It means Test Pressure with Air, expressed in Pascals

Reference pressure for the test with Gas, expressed in Pascals.

Gas flow dispersed in working conditions expressed in dm3/h (direct method (Gas))

Gas flow dispersed in working conditions expressed in dm3/h (indirect method (Air))

Air flow dispersed in test conditions expressed in dm3/h (indirect method (Air)

(Air)
Leak-finding made with air or gas. To be used only when it is possible to establish the machinery volume and only for plants with volume less than 25 dm3

Leak-finding made with gas at the working pressure

Leak-finding made with air, it lasts 15 minutes, with a pressure that can't be lower than 100mbar. The plant is in compliance if there is no pressure-relieving

This test has to be made closing the valve upstream the meter and doing 2 readings of the meter, one every 15 minutes.

1. There is smell of gas in the setting.
2. Replacemet of the devices using gas.
3. Replacement of the type of gas supplied by the gas station.
4. Reuse of gas plants unused for more than 12 months.
5. At least every 10 years

It is the data according to the regional rule to measure the dry-stone CO (without vapour).

It is the temperature at which the humidity contained in the smokes condenses.

It is one of the toxic gases present in the combustion smokes "sulphur dioxide".
It represents the quantity of dioxide in the combustible.

They are the total nitrogen oxides, that is the sum between NO and NO2

It is one of the toxic gases present in the combustions smokes: "nitrogen dioxide"

It is one of the toxic gases present in the combustions smokes: "Nitrogen Oxide".

They represent the difference between the abstract productivity (100%) and real productivity: in other words if the productivity is of the 86%, the leak is of 14%

It is he excess of air present in the smokes. The Ratio, expressed in %, between the difference between the quantity of air used for the combustion and the quantity of stoichiometric air and the stoichiometric quantity itself.

It is the measuring of smokes opacity made with the bacharach pump

The rule number 10 (standard UNI 10389-1) states the formula for the calculation.
Example:
Productivity of a 30.000Kcal boiler installed after 1993:

• at 70°C > 89%
• at 50 °C > 87%

It indicates the vacuum value of the chimney

You have to insert the probe in the hole present is in all the vents to an ultimate distance in order to read the highest temperature (in the middle). Generally the smokes temperature during the analysis in of about 120-300°C

With athmosferic boilers what you have to consideri s the setting temperature of the location where the boiler is installed (combustive agent air).
For watertight chamber boilers the temperature probe must be placed in the suction pipe thanks to its threaded cone.

During the analysis:
10-11% (It depends on the O2 and on the combustible)
in air:
Near to the 0%

During the analysis:
The lowest possible and anyway not higher than 1000ppm
in air:
0 ppm

During the analysis:
from 2 to 5% (Room-sealed boilers) up to 14% (Atmospheric boilers)
in air:
The oxygen in atmosphere is of about 20,9%.