OBTAIN THE LEAKAGE LIMIT OF A DUCT AT THE MOMENT

Application description:

 

With the update on the new regulations that affect the manufacture and assembly of ducts, compliance is increasingly being required and therefore the airtightness verification tests in the finished facilities are being carried out more normally.

Given that it is very difficult to assess “a priori” the level of tightness that a newly assembled installation has, based on the multiple experiences acquired in our assistances on works at the request of our clients to carry out tests, we have been able to develop a tool that undoubtedly it will be very useful to be able to carry out that preliminary evaluation of the state of the airtightness of an installation.

It is a KIT of components that we can supply so that the same personnel of the installation company can carry out the final verifications of the installation of a duct and be able to seal or repair the leaks before the access conditions become complicated and thus be able to comply with the required airtightness class, avoiding final surprises that normally have a difficult solution. The ducts thus prepared will have full guarantees of success so that later, in our final assistance, we obtain the favorable values ​​that will appear in our official test report.

This verification method is very simple:

It is achieved through the use of a medium pressure single-phase centrifugal fan, with exclusive characteristics for RAMI-SYSTEM®, which blows air through a section of flexible duct in the branch of the duct to be tested, a digital pressure gauge and its various components of connection.

The performance of each fan has been previously analyzed in our test bench with respect to a calibrated standard, which determines that, individually and identified with its serial number, a table of correction coefficients at different pressure levels is attached to ensure maximum reliability in its use.

To carry out the test, the duct section is previously plugged at its ends and the fan drive is connected to the pressure gauge. When it stabilizes, its value in kPa is entered in our online application “DUCT LEAKAGE LIMIT CALCULATOR“, together with the selection of the desired sealing CLASS:  A , B , C  or  D and finally the total surface area in of the duct being tested.

After pressing the “CALCULATE” box, in the lower part we obtain the result in percentage on a green background if we are below the acceptable leakage limit value or another percentage on a red background if it exceeds that limit value.

This is how easy it is to verify the airtightness level of a duct: by entering only THREE DATA.

We only recommend that you always give a safety margin above the limit of approximately 10% to correct for possible density variations due to air temperature and atmospheric pressure, since the data entered in the calculator are for air at 20ºC and with 760 mm of pa.

For inquiries or more technical information, you can contact neu@rami-system.es and we will be happy to assist you.

Below there’s our free-to-use application that we hope will be of great use to you:

STABILIZED AIR PRESSURE IN THE DUCT (kPa.)
AIRTIGHTNESS CLASS (A, B, C or D)
TOTAL DUCT SURFACE (m²)
PERCENTAGE OF DEVIATION

Another important advantage:

 

The pressure value of the digital manometer can be anticipated in advance.

The installation company can, “a priori”, establish the pressure values ​​in kPa that each of the branches of the installation ducts will have, so that later, in practice, only that value has to be verified so that the pressure gauge marks it stably. Otherwise, the ducts will have to be sealed until this is achieved.

The known variables will be:

  • the surface of the duct in m²
  • the class of tightness foreseen in the duct

Then, to find out the value of the pressure, it will be necessary to give values ​​in kPa until the result is adequate (maximum fan pressure 1.78 kPa).

This form of use is especially suitable for areas without Internet signal.

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