1. Unless otherwise ordered a full power trial may
either at the beginning of the trial or before leaving port;
be started at any time on the date set.
supervise the performance of the engine room
observers; check the taking of counter readings; render
2. The trial should be divided into hourly intervals,
all decisions following current directives; and check and
but readings should be taken and recorded every half
sign the trial reports.
hour. Data are submitted as hourly readings in the trial
report.
2. The assistant chief observers assist the chief
observers as directed; supervise the performance of the
3. Fuel expenditures for each hourly interval of the
observers; check the taking of fuel oil soundings and
trial should be determined by the most accurate means
meter readings; and make out the trial reports.
practical, normally by meter readings corrected for
3. Assistant observers take fuel soundings, meter
meter error and verified by soundings.
readings, counter readings, the ship's draft, and collect
4. The appropriate material condition of the ship
all other data that may be required for the trial reports.
should be set during the different trials.
The following items should be accomplished or
5. During all trials, the usual housekeeping and
considered before the trial is started.
auxiliary loads should be maintained. The minimum
1. When requested by the observing party, the ship
services provided should include normal operation of
under trial should provide or designate a suitable
the distilling plant, air compressor, laundry, galley,
signaling system so that fuel soundings and the readings
ventilation systems, elevators (if installed), and
of counters and meters maybe taken simultaneously.
generators for light and power under load conditions
similar to those required for normal operations at similar
2. The ship under trial should furnish the chief
speeds under the prescribed material condition
observer with a written statement of the date of last
undocking and the authorized and actual settings of all
6. All ships fitted with indicators, torsion meters,
main machinery safety devices and dates when last
and other devices for measuring shaft or indicated
tested.
horsepower should make at least two observations
during the fullpower trial to determine the power being
3. The ship should have its draft, trim, and loading
developed.
conform to trial requirements. In case a least draft is not
specified, the liquid loading should equal at least 75
7. The chief observer's report of the trial should
percent of the full load capacity.
state whether all rules for the trial have been complied
with.
4. The chief observer should determine draft and
trim before and after the trial, verify the amount of fuel
There are special forms used for full power and
on board, and correct the amount of time at the
economy trial reports. Illustrations of these forms are
beginning of the trial. The draft observer should also
not given in this TRAMAN; however, you can obtain
determine the rpm required for the full power trial at the
copies from your log room and, in this way, get an idea
displacement and injection temperature existing at the
of the data and readings that are required for full power
start of the trial.
and economy trials.
5. The observing party should detect and promptly
Trial forms, and such items as tachometers,
correct any errors in recording data, since it is important
stopwatches, and flashlights, should be available to the
that the required data be correct within the limits of
observing party and to the personnel who take the
accuracy of the shipboard instruments.
readings. Any gauges or thermometers, which are
6. The chief observer should instruct members of
considered doubtful or defective, should be replaced
the observing party to detect any violation of trial
before trials are held. A Quartermaster must check and
instructions, of or of good engineering practice, and then
adjust all clocks in the engineering spaces and on the
verify any such report and provide the commanding
bridge before any trials are held.
officer a detailed account of each violation.
Careful inspections and tests of equipment and
items of machinery must be made that may cause
Manner of Conducting Trials
difficulties during full power operation, since it is
possible that unknown defects or conditions may go
Some of the requirements in regards to the manner
undetected during operation at fractional powers--the
of conducting full power and economy trials are as
normal operating condition of the ship most of the time.
follows:
13-35
