The AMCA laboratory has the capability to test fans, louvers, dampers, air curtains ANSI/AMCA D Laboratory Methods of Testing Dampers for Rating . Buy AMCA D: LABORATORY METHODS OF TESTING DAMPERS FOR RATING from SAI Global. ANSI/AMCA D Laboratory Methods of Testing Dampers for Rating The purpose of this standard is to establish uniform laboratory test methods for.
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Bibliography [This annex is not part of this standard, 50d is included for information purposes only. Similarly, springs, actuators or other dampers should be permitted to close the damper in a manner that will not apply any additional force than normally applied.
A convenient method of doing this is to use an aneroid barometer as a transfer instrument and carry it back aca forth to the Weather Bureau Station for comparison .
If the air or gas is at rest, the total temperature will equal the static temperature. Perform test as described in Section 8. One reading per determination of plenum static pressure Ps8 and plenum temperature td8 shall be recorded. In this case, the leakage through the damper passes entirely through the nozzles.
If the calculated airflow is greater than 4. SI and I-P Conversions.
Heat shall be introduced into the system at a rate which will 8. The characteristics to be determined include, as appropriate, air leakage, pressure drop, dynamic closure, and operational torque.
Open a nozzle 8. Ps5 may not be used to calculate the damper pressure differential. An outlet chamber shall have a cross-sectional area at least fifteen times the free area of the damper being tested. The temperature which exists by virtue of the internal energy of the air only. The airflow generating equipment is to be capable of producing the prescribed airflow and pressure conditions without the use of pressure relief dampers. For each test, amcw readings of ambient dry-bulb temperature tdoambient wet-bulb temperature twoand ambient barometric pressure 5000d shall be recorded unless the readings are steady in which case only one need be recorded.
The airflow face velocity is the velocity established when the damper is in the open position. However, only a test that does not violate any mandatory requirement of this standard shall be designated as a test conducted in accordance with this standard.
Section A-A shows xmca holes equally spaced and free from burrs.
AMCA seeking volunteers to serve on AMCA 500-D Review Committee.
The description of the test setup including specific dimensions shall be recorded. Pressure drop is a measure of the resistance to airflow across a damper. If all results were obtained at the same air density or if results were converted to a nominal density, such density shall be listed; otherwise a curve with air density as ordinate shall be drawn.
Table 3 displays the allowable combinations of 50d0 rate measurement and test damper setups. Measuring planes shall be located a,ca shown in the figure for the appropriate setup. Laboratory Methods of Testing Dampers for Rating 1.
Where a measuring plane is located upstream of the settling means, the purpose of the settling screen is 5000d absorb the kinetic energy of the upstream jet, and allow its normal expansion as if in an unconfined space. Where a measuring plane is 500r downstream of the settling means, the settling means is provided to insure a substantially uniform flow ahead of the measuring plane. Refer to Section 9. Prior to dry-bulb wet-bulb and the shall be 8.
Airflow leakage is the amount of air passing through a damper when it is in the closed position and at a specific pressure differential. If multiple section dampers are to be tested each single section must be tested for closure with all other sections closed.
Six airflow measurement setups are diagramed in Figures 6. The parties to a test for guarantee purposes may agree to exceptions to this standard in writing prior to the test. The damper leakage may then be calculated by using Equation 9.
ANSI/AMCA D – Laboratory Methods of Testing Dampers for Rating
Rigid support shall be 500c to hold the Pitot-static tube axis parallel to the axis of the duct within 1 degree at the head locations specified in Figure 3 within 1. The damper leakage for these two tests is given by Equations 9.
A test shall be conducted at a selected airflow rate through the damper when fully 500x and a selected pressure drop across the damper when closed.
Absolute pressure is the value of a pressure when the datum pressure is absolute zero. The damper shall then be covered with a suitable solid board, or other material, which prevents airflow through the damper.
Each damper shall be tested a minimum of three 500v in both airflow directions at each selected combination of airflow rate through the open damper and qmca differential across the closed damper. Scope This standard may be used as a basis for testing dampers when air is used as the test gas.
A correction shall be made to adjust the pressure drop measured at test conditions to the pressure drop which would be measured at the same airflow rate with standard air density [1.