1. What is FAD Meter?
The FAD Meter is vortex flowmeter custom designed to monitor the efficiency of the compressors. It is the only flowmeter that integrates pressure and temperature compensation and gives an accurate information of the compressor’s true output, its Free Air Delivery (FAD)
2. What is FAD?
Free Air Delivery: It is the amount of Atmospheric Air (Free Air) that is sucked in by the Compressor at inlet (Suction Side) in order to produce a given amount of compressed air, under conditions like:
• Atmospheric Pressure at 1 atmosphere.
• Atmospheric Temperature at 20°C/15°C.
• Relative Humidity at 0% (100% Dry Air) &
• The motor RPM at 100% of its rated value
3. Why is it important to use the FAD Meter?
The efficiency of compressors is affected by factors such as altitude of location, temperature, dust, humidity etc. This means that the output of the same compressor will vary from location to location. For example, a compressors will produce 7% more FAD in Pune than at Chennai (due to altitude difference). By measuring the FAD, we can monitor the efficiency of compressor in real time, and then compare it against the rated output given by the manufacturer
4. How FAD Meter works?
Forbes Marshall FAD Meter is a mass flow meter which works on the Karman Vortex Street principle of flow measurement. Compressed air passing through the flowmeter body create vortices, and an piezo-electric sensor then measure the frequency of vortice formation, and calculates the flowrate as per that. The integrated pressure and temperature sensor then help calibrate the output of the flowmeter to make it more accurate.
5. Where it should be installed?
The FAD Meter is installed on the outlet of the compressor. A straight length of 20D (flowmeter inlet) and 10 D (at the flowmeter outlet) is to be maintained in order to get accurate readings.
6. What are the advantages of Forbes Marshall FAD Meter over other air flowmeters?
a) The integrated pressure and temperature compensation of the FAD meter ensure a best ever accuracy. No other flow meter offers this feature.
b) Lesser energy consumption - Orifice type, DP flow meters induce a pressure drop in order to measure flow. In order to compensate for this the compressors have to generate higher pressure pressure, causing higher energy consumption. The FAD meter causes only very marginal pressure drop.
c) The FAD meter has no moving parts. This ensures a long life and better performance.
7. Benefits of FAD Meter
- Accuracy of +/- 1% of measured value
- Optimum process reliability thanks to Flodoc Intelligent Signal Processing stable readings, free of external disturbances
- Reconcile generation with consumption and losses
- Reduce downtime through preventive maintenance
- Avoid periodical overhauls, When not necessary
- Better process control resulting in enhanced product quality
Very simple to compute the Monthly Bill of compressor:
Example: Your’s is a 2,340 cfm (Free Air) Compressor,
Then your Monthly Electricity Bill is,
(In Rupees) = 2,340 × 0.95 × 60 × 24 × 30 / 100
[1 cubic feet of Air (Free Air) costs approx 0.95 paise.]
= Rs 9,36,000/-
= Rs 1,15,24,000 /- per Year
= approx Rs 1 Crore 15 Lacs per year
An Investment of close to 1% of this 1 Crore 15 Lacs is worth investing to monitor this 1 Crore 15 Lacs!