JFTOT Heater Tubes – ASTM D3241
- JFTOT heater tubes are specifically designed and manufactured to meet the stringent requirements of the ASTM D3241 Jet Fuel Thermal Oxidation Stability Test.
- Metaspec D3241 heater tubes are now officially recognised as equivalent by the ASTM D02 Committee and included in Table 2 footnote of the ASTM D3241 standard.
- The following equipment, heater tube and filter kits, manufactured by Metaspec (www.metaspec.com), 355 Spencer Ln, Suite 1-112, San Antonio, TX USA 78201 was run through the test protocol in RR:D02-1550 and determined as equivalent to the equipment used to develop the test method. These heater tube and filter kits are identical to those marketed by AD Systems (www.adsystems-sa.com), 5, Allée de Cindais, 14320 Saint André sur Orne, France. This test is detailed in RR:D02-xxxx. This is not an endorsement or certification by ASTM International.
- Essential for evaluating the thermal stability of jet fuel
- Enables consistent and reliable assessment of jet fuel quality
- Manufactured from 6061-T6 aluminium, Mg: Si ratio <= 1.9; Mg2Si% <= 1.85%, ensuring durability and consistent thermal properties.
- Precisely polished using rotational cut buffing technique and patented polishing compound to provide a uniform surface for accurate deposit rating.
- Compatible with both visual comparisons using standard colour charts and digital tube rating systems.
- Each tube is serial numbered for traceability and quality control.
- Thoroughly cleaned, inspected, and ready for immediate use in laboratory testing.
- Proven to deliver statistically equivalent results to other leading brands.
JFTOT (Jet Fuel Thermal Oxidation Tester) heater tubes are essential consumable components used in the ASTM D3241 test method. This test is the industry standard for evaluating the thermal stability of jet fuel. During the test, fuel is passed over the heater tube under controlled conditions of temperature and flow. The purpose is to simulate the high-temperature conditions experienced by jet fuel within an aircraft’s fuel system. If the fuel contains impurities or is unstable, deposits will form on the heater tube’s surface. The amount and appearance of these deposits indicate the fuel’s propensity to form coke and other harmful substances that can clog fuel filters and negatively impact engine performance. Metaspec heater tubes are manufactured to the specifications of the ASTM D3241 standard to ensure consistent and reliable results. A consistent and controlled surface finish is crucial for accurate and repeatable measurements, whether using visual comparison to a colour standard or automated digital rating systems. Each tube is carefully cleaned, inspected, and serialized to ensure the highest quality and traceability.
Specifications of Metaspec JFTOT Heater tubes
One box of D3241 heater tubes includes 10 tubes, 10 filters and 30 O-rings.
| Specification | Details |
| Material | 6061-T6 aluminum, Mg:Si ratio <= 1.9; Mg2Si% <= 1.85% |
| Heater Tube length | 161.925 mm ± 0.254 mm |
| Centre section length | 60.325 mm ± 0.051 mm |
| Outside diameter | Shoulders, 4.724 mm ± 0.025 mm |
| Outside diameter | Centre section, 3.175 mm ± 0.051 mm |
| Inside diameter | 1.651 ± 0.051 mm |
| Total indicator runout | max 0.013 mm |
| Test Filter | Nominal 17 μm stainless steel mesh |
