ASTM D6824 Standard Test Method for Determining Filterability of Aviation Turbine Fuel
6. Apparatus
6.1 Micro-Filter Analyzer - The apparatus is shown diagrammatically in Fig. 1 and photographically in Fig. 2. It is capable ofmeasuring pressure upstream ofthe filtering element and the volume of sample passed through the filter at a preset pressure level. The apparatus is comprised of the following parts:
6.1.1 Peristaltic Pump, variable speed/flow rate, with feedback speed control, adjusted to provide fuel delivery at a constant rate of 20 +/- 1 mL/min, and incorporating a pulse dampening mechanism to produce a smooth flow.
6.1.2 Pressure Transducer, capable of measuring gage pressure in the range from 0 to 104 kPa, in 1.0 kPa increments (0 to 15 psi, in 0.1 psi increments).
6.1.3 Three Digital Displays, one for pressure readout capable of interfacing with transducer (see 6.1.2) with display range from 0 to 104 kPa in 1.0 kPa increments (0 to 15 psi in 0.1 psi increments), one for volume readout with display range from 0 to 300 mL in 1 mL increments, and one for filterability quality factor (F-QF).
NOTE 2 - The micro-filter analyzer can display the pressure in either kPa or psi units by changing an internal jumper wire.
6.1.4 Speed Controller, manual speed adjustment of the peristaltic pump to increase/decrease amount of sample delivered for a given period of time.
6.1.5 Fuel Reservoir Container, polytetrafluoroethylene (PTFE), funnel shaped, 500-mL capacity.
6.1.6 Collection Container, glass or plastic Erlenmeyer flask, 500-mL capacity.
6.1.7 Tygon Tubing, fuel compatible, 3.1-mm (0.12-in.) inner diameter.
6.1.8 Plastic In-Line Splice Coupler, fuel compatible, capable ofbeing inserted into, and making a seal in Tygon tubing (see 6.1.7).
6.1.9 Plastic Tee Coupler, fuel compatible, capable of being inserted into, and making a seal in Tygon tubing (see 6.1.7).
6.1.10 Plastic Luer-Loc Coupler, fuel compatible, one end capable of being inserted into, and making a seal in Tygon tubing (see 6.1.7) and the other end into the filter unit (see 6.2).
6.2 FCell Filter Unit, disposable, precalibrated assembly consisting of a shell and plug containing a 25-mm diameter nylon membrane filter of nominal 0.65-µ pore size, nominal 60 % porosity, with a 158.9-mm2 effective filtering area.
6.3 Accessories for Apparatus Verification Test:
6.3.1 Measuring Cylinder, 500-mL capacity, with 1-mL graduations.
6.3.2 Pressure Gage, 350-kPa (50-psi) capability, graduations 0.5 kPa (0.1 psi).
6.3.3 Thermometer, general purpose type, with a range of 0 to 60°C and conforming to the requirements prescribed in Specification E 1.
