Aviation kerosene coalescer cartridge – ≤15ppm water, β≥1000, EI 1581 compliant.

1. Working Condition Background & Core Matching Restrictions

Aite Coalescer & Separator Cartridge is designed for aviation kerosene (Jet A-1/JP-8) refining and dehydration processes – covering 

refinery finished product outlets, tank farm storage and transfer, pipeline transportation, airport fixed fuel supply facilities, 

and aircraft refueling vehicles. This high-performance cartridge is the key core component for purifying aviation fuel, as the 

medium contains solid particulate pollutants (rust, catalyst debris, mineral fine powder, pipeline wear particles), free water, 

and emulsified micro-water droplets. Excessive water and impurities cause engine combustion failure, fuel system valve corrosion,

 and filter screen blockage – requiring dual functions of particle interception and micro-water coalescence separation.

Aite Coalescer & Separator Cartridge complies with core mandatory index limits stipulated by EI 1581 (revised from API 1581), 

GB/T 21357, and GJB 610 – achieving outlet free water content ≤15 ppm, coalescence removal efficiency ≥99.5%, 

and solid particle cleanliness per NAS 1638 Class 6 standard with β ≥ 1000 interception efficiency.

The flux and filtration accuracy of Aite Coalescer & Separator Cartridge form a fixed matching relationship. Excessive flux under

 fixed precision leads to shortened coalescence residence time, incomplete water droplet agglomeration, reduced particle

 interception efficiency, and rapid pressure difference rise.

2. Fundamental Matching Mechanism Between Flux and Filtration Accuracy

Aite Coalescer & Separator Cartridge adopts multi-layer gradient hydrophilic glass fiber composite structure – outer coarse fiber

 layer intercepts large particles, middle transition layer pre-coalesces tiny water droplets, inner fine precision layer completes 

deep particle filtration and full water droplet agglomeration. The matching logic follows three physical constraints:

· Residence time constraint: Finer filtration accuracy means smaller pore size and higher flow resistance – excessive area flux

 causes micro-water droplets to flow out without sufficient collision and agglomeration

· Particle interception constraint: Excessive flux increases fluid shear force – intercepted fine particles are re-carried downstream, 

reducing actual filtration efficiency

· Pressure difference service life constraint: Excessive flux accelerates pollutant accumulation – shortening the cycle from initial 

pressure difference to replacement pressure difference (0.15 MPa)

Basic matching rule: The higher the filtration precision, the lower the allowable area flux, and the smaller the single-cartridge 

rated treatment flow under the same cartridge size.

3. Graded Matching Standard of Filtration Accuracy & Allowable Area Flux

All data for Aite Coalescer & Separator Cartridge are calibrated under standard working conditions: aviation kerosene 

viscosity 1.2–1.6 mm²/s, medium temperature 10–40°C, inlet water mass fraction ≤0.2%, initial pressure difference ≤0.03 

MPa – complying with EI 1581 Category C Type S test conditions.

Grade Filtration Accuracy Water Removal Efficiency Outlet Free Water Allowable Area Flux Single-Cartridge Rated Flux

Grade 1 0.3μm ≥99.9% ≤10 ppm ≤35 L/(min·m²) ≤560 L/min

Grade 2 0.5μm ≥99.7% ≤12 ppm ≤45 L/(min·m²) ≤720 L/min

Grade 3 1μm ≥99.5% ≤15 ppm ≤55 L/(min·m²) ≤880 L/min

Matching limit corrections:

· When inlet water content exceeds 0.1%, reduce allowable flux by 20% (Grade 1)

· When medium temperature exceeds 50°C, reduce flux by 10% (Grade 2)

4. Auxiliary Correction Factors Affecting Flux-Accuracy Matching

4.1 Medium Temperature & Viscosity Correction

When working temperature exceeds 40°C, aviation kerosene viscosity decreases, fluid shear force increases, and water droplet 

agglomeration stability weakens. Aite Coalescer & Separator Cartridge flux shall be multiplied by a temperature correction coefficient:

Temperature Range Correction Coefficient

40–60°C 0.9

60–80°C 0.8

Above 80°C Not recommended for long-term operation

4.2 Inlet Pollution Load Correction

Classified by EI 1581 pollution grade, the flux reduction coefficient for Aite Coalescer & Separator Cartridge:

Pollution Category Correction Coefficient

Category A (high water & high solid) ×0.75

Category B (medium pollution) ×0.85

Category C (low terminal pollution) ×1.0

4.3 Cartridge Structural Form Correction

Pleated coalescer media has larger effective filter area than flat winding media. Flat media flux of Aite Coalescer & Separator 

Cartridge shall be reduced by 30% compared with pleated media of the same precision.

5. System Design Matching Calculation Standard Flow

Step 1: Confirm system maximum continuous treatment flow Q (L/min)

Step 2: Select coalescer cartridge precision grade according to working section pollution classification (0.3/0.5/1μm)

Step 3: Query the maximum allowable area flux q corresponding to the precision grade

Step 4: Calculate minimum total effective filter area required: A_total ≥ Q ÷ q

Step 5: Select single-cartridge effective filter area A₁, calculate minimum cartridge quantity N ≥ A_total ÷ A₁ (round up)

Step 6: Apply temperature and pollution load correction coefficients to recheck actual single-cartridge flow

Calculation Example: Airport terminal fuel supply system maximum flow 2400 L/min, select 0.5μm precision cartridge, 

single-cartridge effective area 16m², allowable area flux 45 L/(min·m²)

· Minimum total area = 2400 ÷ 45 = 53.34m²

· Minimum cartridge quantity = 53.34 ÷ 16 ≈ 3.34, take 4 cartridges

· Actual single-cartridge flow = 2400 ÷ 4 = 600 L/min, lower than rated upper limit 720 L/min – matching standard compliance

6. Judgment Standard of Matching Failure

Fault 1: Filtration precision meets standard, but outlet free water exceeds 15 ppm

· Root cause: Area flux exceeds upper limit; insufficient coalescence residence time; medium temperature too high without

 flux reduction

· Rectification: Increase number of Aite Coalescer & Separator Cartridges to reduce single-cartridge flux; install cooling equipment

 to control medium temperature below 40°C

Fault 2: Outlet fuel solid cleanliness downgrades, servo valve wear occurs

· Root cause: Excessive flux causes fluid shear force to re-carry intercepted fine particles downstream

· Rectification: Upgrade to higher-precision Aite Coalescer & Separator Cartridge; reduce system operating flow to meet area

 flux matching limit

7. Daily Operation Monitoring Standard

· Real-time flow recording: Monitor system instantaneous flow – prohibit long-term operation exceeding design maximum flow 

by more than 10%

· Pressure difference tracking: Record initial pressure difference of new cartridges and daily growth rate – if daily growth 

exceeds 0.01 MPa, check whether flux exceeds matching limit

· Regular water content sampling: Test outlet free water content every shift – once exceeding 15 ppm, prioritize checking flow 

and area flux matching status

· Seasonal correction: In high-temperature summer environments, reduce system operating flow by 10–20% according to

 temperature correction coefficient

8. Frequently Asked Questions (FAQ)

Q1: What is the Aite Coalescer & Separator Cartridge designed for?

A: Aite Coalescer & Separator Cartridge is designed for aviation kerosene dehydration and purification – removing solid particulate 

pollutants, free water, and emulsified micro-water droplets to meet EI 1581, GB/T 21357, and GJB 610 standards.

Q2: What water content can the Aite Coalescer & Separator Cartridge achieve?

A: Aite Coalescer & Separator Cartridge achieves outlet free water content ≤15 ppm (Grade 3), ≤12 ppm (Grade 2), and ≤10 ppm

 (Grade 1) – with coalescence removal efficiency ≥99.5%.

Q3: What filtration accuracy grades are available for the Aite Coalescer & Separator Cartridge?

A: Aite Coalescer & Separator Cartridge is available in 0.3μm, 0.5μm, and 1μm precision grades – all with β ≥ 1000 interception

 efficiency.

Q4: What is the relationship between flow rate and filtration accuracy?

A: For Aite Coalescer & Separator Cartridge, higher filtration precision requires lower allowable area flux.

 Grade 1 (0.3μm) allows ≤35 L/(min·m²), Grade 2 (0.5μm) allows ≤45 L/(min·m²), Grade 3 (1μm) allows ≤55 L/(min·m²).

Q5: What correction factors affect the flux-accuracy matching?

A: Aite Coalescer & Separator Cartridge matching is affected by medium temperature (×0.9 at 40–60°C, ×0.8 at 60–80°C),

 inlet pollution load (×0.75 for Category A, ×0.85 for Category B), and cartridge structural form (flat media reduced by 30%).

Q6: How do I calculate the required number of cartridges for my system?

A: Divide system maximum flow by allowable area flux to get minimum total area, then divide by single-cartridge area to 

get minimum quantity. Apply correction factors for temperature and pollution load. Contact our technical team for assistance 

with Aite Coalescer & Separator Cartridge selection.

Q7: What causes outlet free water to exceed 15 ppm?

A: Common causes include area flux exceeding the upper limit, insufficient coalescence residence time, and medium temperature

 too high without flux reduction. Increase cartridge quantity or install cooling equipment.

Q8: What documentation is provided with the Aite Coalescer & Separator Cartridge?

A: Each shipment includes material certificates, filtration performance test reports, dimensional inspection records, and compliance 

declarations for EI 1581 and GJB 610 standards.

Q9: Can the Aite Coalescer & Separator Cartridge be customized?

A: Yes. Aite Coalescer & Separator Cartridge supports customization – including special dimensions, filtration accuracy grades, 

and sealing materials based on specific site requirements.

Q10: What industries use the Aite Coalescer & Separator Cartridge?

A: Aite Coalescer & Separator Cartridge is widely used in refinery terminals, tank farms, pipeline intermediate stations,

 airport fuel supply facilities, and aircraft refueling vehicles.

Q11: How often should the Aite Coalescer & Separator Cartridge be replaced?

A: Replace Aite Coalescer & Separator Cartridge when differential pressure reaches 0.15 MPa, or when outlet free water content 

exceeds 15 ppm despite proper flow matching. Monitor differential pressure daily.

Q12: Can I order samples of the Aite Coalescer & Separator Cartridge before bulk purchase?

A: Yes. We support paid sample orders with production lead time of approximately 7–10 days. Sample costs are fully deductible

 from your first bulk order upon approval.

Aite Coalescer & Separator Cartridge – EI 1581 compliant, three precision grades, ≤15 ppm outlet water, β ≥ 1000 interception 

efficiency. Contact us today for a free flow-matching calculation and competitive factory-direct quotation within 24 hours.