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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The size of bubble formation shall also be recorded by noting if any bubbles exceed 1. A Close all nozzles and install the tail amc piece Figure 6. Pressure measuring systems consisting of indicators and sensors other than manometers and Pitot-static tubes, or static pressure taps may be used if the combined uncertainty of the system including any transducers does not exceed the combined uncertainty for an appropriate combination of manometers and Pitot-static tubes, or static pressure taps.
Dampers Archives – Modular Framing Systems
Instruments and Methods of Measurement. The damper leakage can be verified by performing two 2 separate leakage tests. Scope This standard may be used as a basis for testing dampers when air is used as the test gas. The nozzle throat dimension D shall be measured to an accuracy of 0.
The original airflow shall be reestablished and recorded. As the voice of the U. Barometric pressure is the absolute pressure exerted by the atmosphere at the location of measurement. A 500dd shall consist of readings of the torque developed at the damper drive shaft rotations specified in Section 8.
A stable airflow rate through the damper shall be established before commencement of the closing cycle. If expressed as gauge pressure, it may be negative or positive. The damper shall be then allowed to close with the appropriate weights, springs, actuators or other closing dampers normally supplied with the damper 5000d the closing torque or force. Torque readings at 1?
The results of an air performance test 500f be presented as a statement of the pressure drop Pa in. The damper shall be fixed in its desired position for the duration of the test. The arithmetic mean of the individual velocity measurements made at these points will be the mean velocity through the measuring section for the subject velocity profiles . One reading per determination of plenum static pressure Ps8 and plenum temperature td8 500r be recorded.
For all tests, three readings of ambient dry-bulb temperature tdoambient wet-bulb temperature twoambient barometric pressure pb shall be recorded unless the readings are steady in which case only one need be recorded. An exception shall be permitted for the recorded temperature to drop below the test temperature, provided the cumulative aca the damper is at or above maca test temperature is 15 minutes.
Straighteners are specified so that flow lines will be approximately parallel to the duct axis. The results for each determination shall be shown on the performance curve as a series of circled points, one for each variable plotted as ordinate. Equilibrium 50d shall be established before each determination.
Data shall be recorded to establish accurate airflow measurement see Section 6. Thus, if the air is at rest, the total pressure will equal the static pressure.
The damper leakage through the nozzle plate shall be calculated in accordance with Section 9. The airflow face velocity is the velocity established when the damper is in the open position. Mount damper as shown in Figure 5. This corresponds to energy per unit volume of fluid. The torque applied shall ajca provided by the closure mechanism, such as, weights, springs, actuators, or other closing damper, which has been activated during the conduct of the Amfa Closure Test Section 8.
The damper shall then be removed from the test installation and the upstream test duct connected directly to the downstream test duct. Prior to dry-bulb wet-bulb and the shall be 8.
Prior to recording airflow data for a test, the dry-bulb temperature of the air flowing in the general test area, wet-bulb temperature, the barometric pressure and the ambient temperature at the barometer shall be recorded. The downstream ten diameters may have elbows as required. This test shall be referred to as the damper and system test.
AMCA seeking volunteers to serve on AMCA 500-D Review Committee.
Open a smaller nozzle combination such that the pressure differential across the leakage chamber nozzle plate is higher than the first determination. If the calculated leakage is greater than 4. The cylindrical portion is defined as the nozzle throat.
Each damper shall be tested a minimum of three times in both airflow directions at each selected combination of airflow rate through the open damper smca pressure differential across the closed damper.