D3241_11 (18) 04-2018
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Filter an aerate sample using
standard operating conditions.
See A5.2.9 of the
written standard.
Warning-- all jet fuels
must be considered flammable
except JP-5 and JP-7.
Vapors are harmful.
See A6.3, A6.6, and A6.7
of the written standard.
Before operating, see warning in
6.1.1 of the written standard.
Test method results
are known to be
sensitive to trace contamination
from sampling containers.
For recommended containers,
refer to Practice D4306.
Maintain temperature of
sample between 15 degrees
Celsius and 32 degrees
Celsius during aeration.
Put reservoir containing
sample into hot or cold water
bath to change
temperature if necessary.
Allow no more than
1 hour to elapse
between the end of
aeration and the start
of the heating of the sample.
Assemble the reservoir section.
See user manual.
Install reservoir
and connect lines
appropriate to the
instrument model being used.
See user manual.
Remove protective cap and
connect fuel outlet line
to heater section.
Do this quickly to
minimize loss of fuel.
Check all lines to
ensure tightness.
Recheck thermocouple
position at 39 millimeters.
Make sure drip receiver is
empty, models 230 and 240 only.
Turn power to On.
Energize the Delta
P alarm on models
with manual alarm switch--
models 202, 203, and 215.
Pressurize the system slowly
to about 3.45 megapascals,
as directed in the user manuals
for models 202, 203, and 215.
See also A5.2.5 of
the written standard.
Inspect the system for leaks.
Depressurize the system
as necessary to tighten
any leaking fittings.
Set controls to the standard
operating conditions.
Use a heater tube
control temperature
as specified for the
fuel being tested.
Apply any thermocouple
correction
from the most
recent calibration.
See A5.2.8 of the
written standard.
The test can be run to a
maximum tube temperature
of about 350 degrees Celsius.
The temperature at which
the test should be run
and the criteria
for judging results
are normally embodied
in fuel specifications.
Use procedure for each
model as described
in the appropriate user manual.
Some instrument models
may do the following steps
automatically, but verify
that no more than 1
hour maximum elapses from
aeration to start of heating.
The manometer bypass
valve is closed
as soon as the heater tube
temperature reaches the test
level so fuel flows
through the test filter.
See A5.2.6 of the
written standard.
Manometer is set to 0.
See A5.2.6 of the
written standard.
Check fuel flow rate against
standard operating conditions
by timing flow or counting
the drip rate during first 15
minutes of test.
See X1.5 of the
written standard.
When counting drop
rate, the first drop
is counted as drop 0,
and time is started.
As drop 20 falls,
total time is noted.
Record filter pressure drop
every 30 minutes minimum
during the testing period.
If the filter pressure
drop begins to rise sharply
and it is desired to run
a full 150-minute test,
a bypass valve
common to all models
must be opened in order
to finish the test.
See appropriate user manual
for details on operation
of the bypass system.
See A5.2.2 of the
written standard.
Make another flow check
within final 15 minutes
before shutdown.
See 11.4.3 of the written
standard and accompanying note.
See X1.5 of the
written standard.
If a heater tube temperature
profile is desired,
obtain as described in X1.4
of the written standard.
For models 202,
203, and 215 only.
Switch the heater,
then pump, to Off.
Close nitrogen pressure valve
and open manual bypass valve.
Open nitrogen
bleed valve slowly,
if used, to allow
system pressure
to decrease at an approximate
rate of 0.15 megapascals.
Models 230 and 240 shut
down automatically.
After shutdown,
turn flow selector
valve to Vent to
relieve pressure.
Piston actuator will
retreat automatically.
Measure affluent in drip
receiver, then empty.
Disconnect fuel inlet
line to the heater section
and cap to prevent fuel
leakage from reservoir.
Disconnect heater section.
Remove heater tube
from heater section
carefully so as to avoid
touching center part of tube,
and discard test filter.
Flush tube with recommended
general cleaning solvent--
see 7.2 of the written
standard-- from top down.
If the tube is
grasped from the top,
do not wash solvent over
gloves or bare fingers.
Allow to dry.
Return tube to
original container,
mark with identification,
and hold for evaluation.
Disconnect reservoir.
Measure the amount of spent
fluid pumped during the test
and reject the
test if the amount
is less than 405 milliliters.
Discard fuel to waste disposal.