A2. Jftot Equipment Description - PAC Alcor JFTOT II Manual

• Avoid prolonged or repeated breathing of
vapor or spray mist.
• Avoid prolonged or repeated contact with
skin
A1.6 Aviation Turbine Fuel
(Jet A or A-1, Jet B, See ASTM Specification D
1655)
• Keep away from heat, sparks, and open
flame.
• Keep container closed.
• Use with adequate ventilation.
• Avoid buildup of vapors and eliminate
sources of ignition, especially nonexplosion-
proof electrical apparatus and heaters.
• Avoid breathing vapor or spray mist.
• Avoid prolonged or repeated contact with
skin.

A2. JFTOT EQUIPMENT DESCRIPTION

A2.1 Apparatus
• The JFTOT (Jet Fuel Thermal Oxidation
Tester) is used for the thermal oxidation
stability test of turbine fuels. It consists
essentially of a fuel system with a heater
tube test section (including a test filter),
together with associated equipment for
controlling and measuring the heater tube
temperature. A differential pressure trans-
ducer is used to measure DP across the test
filter. Several figures follow to aid in
component identification.
• Certain essential accessories and materials
are not supplied with the JFTOT II. These
are listed in the Appendix under MATERI-
ALS, SUPPLIES, AND SPARES.
A2.2 General Description
There are four basic systems in the JFTOT II:
Fuel System
Cooling System
Fuel Aeration System
Electrical System
Page 32
A2.3 Fuel System
• The syringe drive pump uses the hydraulic
action of the reservoir piston to produce
pressure on the fuel system. A regulator at
the outlet of the system maintains the
pressure at a constant value by maintaining
a constant "leak". The control is precise
because the regulator is only exposed to
water which is displaced by the test fuel.
An absolute pressure transducer measures
the fuel pressure on the overall system. The
transducer sends a signal to the controller to
ensure the pressure is maintained above 450
psig.
• Before pressurizing, the fuel system is bled
of any air so there will be no bubbles in any
part of the system that are under high
pressure during a test. The air trap assem-
bly is used during the air bleeding process to
confirm the system has been bled properly.
• The test fuel is forced from the fuel reser-
voir through the test section by action of the
rising piston. The pump is driven by a
speed-controlled motor to produce a dis-
placement of 3 ml/min.
• From the reservoir outlet, the fuel flows
through a 0.45 micron membrane type filter,
and then to the lower (inlet) part of the
heater test section. The heater tube is
connected between two electrically pow-
ered busses and is electrically insulated
from the outer housing by means of a non-
conductive ferrule/O-ring combination. The
fuel rises vertically in the annular space
between the aluminum heater tube and its
outer stainless steel housing. A low-voltage,
high current AC signal is passed through the
heater tube to produce resistance heating.
Exiting the heater tube section, the fuel
passes through a test filter having an
element made from stainless steel cloth with
a rated porosity of 17 microns.
• The test filter can be bypassed at any time;
normally when the DP reaches 250 mm Hg.
The fuel reaches a water reservoir by either
route, displacing the water in the reservoir.
The water proceeds through a pressure
JFTOT II Operation Manual Rev. C