Avery Hardoll BM Series flowmeters are precision made, positive displacement, liquid measuring instruments that maintain the higest level of accuracy over a lifetime of operation. Simplicity of design and accuracy has resulted in the Avery-Hardoll BM Series meters to being the most preferred meters by aviation fueling operators and airlines in internatonal markets.
BM Series bulkmeters are manufactured in three basic sizes with different ratings identified by a series number.
The series numbers, sizes, flow rates, and a brief description of each series of meter are shown below.
TYPES OF BULKMETER
Serial Number : BM650
Manifolds : 4 inches, 102 millimeters
Flow Rates : 65 – 650 Imperrial Gallons, 300 – 3000 liters
General Description : Triple Capsule Meters
BULKMETER MAIN COMPONENTS
- The BM Series bulkmeters consist of three main assemblies: the manifold, body assembly and rotor assembly
- The higher rating of the larger meters is achieved by bolting two or three body capsules together and fitting double or triple rotor assemblies with a larger manifold to suit
- A calibrating mechanism and mechanical register are also attached to the front end cover
- The calibrating mechanism can be replaced by a front cover incorporating a pulse transmitter when required for electronic systems, such as MASTERLOAD II™ or MASTERLOAD III™ registers
Meter Series : BM250
Pipeline Size : 4” (102mm)
Flow Rate : 65 to 650 Imp. Gal, 300 to 3000 lpm, 18 to 177 M³/h
Flanges Conform To : ASA 150 FF
Flanges Material : Steel
Avery-Hardoll bulkmeters can be used on all petroleum products of all viscosities. However there is obviously an increase in pressure drop with more viscous fuels which, under normal circumstances, will limit the maximum flow rate obtainable.
It is recommended that the pressure drop through a bulkmeter should not exceed 15 psi (one bar), above which the load on the bearings will start to cause wear. Consequently when using products with viscosities (at operating conditions) above 100 centistokes, it is necessary to reduce the maximum permitted flowrate. As a guide it is suggested that the pressure drop through the meter should not exceed 10 psi (0.7 bar) for continuous running at maximum speed or 15 psi (one bar) for continuous running at half speed.
The low pressure drop for the BM series of Avery-Hardoll bulkmeters is displayed below:
Maximum working pressure: 10.5 bar (150 psi)
Test pressure: 21 bar (300 psi)
Temperature range: -28ºC to 100ºC
Volume per revolution:
- 2.27 litres (single capsule)
- 4.54 litres (double capsule)
- 6.82 litres (triple capsule)
Repeatability (typically): .02%
- Calibration adjustment is provided to minimize the meter error at any selected flowrate. Adjustment is stepless; no gear changing is necessary; the calibration screw is easily accessible after breaking a seal and removing a sealing screw.
- All meters are tested to 300 psi (21 bar).
- All meters are tested before dispatch at a range of flow rates, and test certificates can be supplied if requested.
- The fluid used for testing is odorless kerosene.
- Specific gravity at 60/60ºF, 15/15ºC = 0.8
- Viscosity at 60ºF, 15ºC = 2.4 centistokes.
- Suggested correction to be made to the calibrating mechanism when used with products with different viscosities as follows:
- Gasoline + 0.1% + means increase counter readings
- Kerosene 0.0% – means decrease counter readings
- Gas Oil – 0.1%
- Fuel Oil – 0.22%