power trials shall be conducted with a minimum 75
percent liquid load at the commencement of the trial.
During the trials, fleet and type commanders must
ensure machinery alignments are according to heat
balance diagrams, propulsion operating guides, and
applicable technical documentation.
Compile Information
The information compiled during the full power
trial must be entered on standard forms used for all gas
turbine-powered ships. All the following forms except
the one shown in figure 1-9 are available through normal
supply channels according to NAVSUP P-2002. Figure
1-6 is the trial transmittal letter (cover sheet), OPNAV
form 9094/1A, NSN 0107-LF-090-9405. Figure 1-7 is
sheet 1 of 2 of the trial data form, OPNAV form
9094/1D, NSN 0107-LF-090-9440. Figure 1-8 is sheet
2 of 2 of the trial data form, OPNAV form 9094/1D,
N S N 0 1 0 7 - L F - 0 9 0 - 9 4 4 5 . V i e w A s h o w s p l a n t
condition data for 1A GTE, while view B shows data for
1B GTE. The form shown in figure 1-9 is not available
in the supply system, but it is the standard format used
to report the actual propulsion plant condition to the
chief observer before a full power or even an economy
trial commences.
Disseminate Information
For you to properly disseminate the information,
you must be familiar with all operating characteristics
of your plant. In other words, you need to go back to
the basics and use all the guidelines provided in the
EOSS and applicable technical manuals. If the
readings are improperly disseminated, it could mean
the difference between a satisfactory or unsatisfactory
trial.
ECONOMY TRIALS
Economy trials in most cases will be scheduled on
the same day as the full power trials. They are usually
scheduled in this manner because of the ships
competitive exercise schedule and the availability of
observers.
Just because these trials are usually
conducted together does not mean their accomplishment
periodicity is the same. Economy trial periodicity is
established by your fleet and type commanders. Fleet
and type commanders also must be sure machinery
alignments during economy trials conform to
p r o p u l s i o n o p e r a t i n g g u i d e s a n d N A V S E A ,
SL101-AA-GYD-010, Energy Conservation.
All the economy trial report forms are the same as
those used for the full power trials. Refer again to
figures 1-6 through 1-8. The forms are the same, but
the information entered in the equipment operating
sections of these forms may differ. However, if both
trials are accomplished on the same day, the
information provided on the form shown in figure 1-9
will be the same.
DRAFT REPORTS
Reports of all satisfactory and unsatisfactory
engineering trials must be provided to Commander,
Naval Sea Systems Command (SEA56X1). The report
of an unsatisfactory trial is particularly important. It
provides information on design or material problems
that preclude a successful trial.
MARINE GAS TURBINE EQUIPMENT
LOGBOOKS
The Navy deploys gas turbine equipment in
propulsion and ship-services systems in its surface
fleet. Selection of gas turbine equipment for these
systems reflects a commitment to increase ship
availability through reduction in system downtime.
Gas turbine equipment combines acceptable
reliability and onboard maintenance features with
ease of removal and replacement. System downtime
and lower shipboard manning levels have been
realized through properly directed maintenance and
logistic support, and reliability and maintainability
improvement efforts.
Service records, as described in this section, are
used to retain significant historical operating and
m a i n t e n a n c e d a t a o f g a s t u r b i n e e q u i p m e n t
transferred between shipboard installations and repair
or rework facilities.
Service records provide a
consolidated source of background information
available to personnel conducting and analyzing
maintenance activity.
All gas turbine records are designed according to
t h e 3 - M M a i n t e n a n c e D a t a S y s t e m ( M D S )
organizational (ship) maintenance data collection or
reporting requirements. They are particularly important
because of the interface in marine gas turbine equipment
support between shipboard organizational maintenance
and shore-based depot maintenance.
The use of service records and logbooks is similar
to the approach applied successfully in NAVAIR for
many years in the aircraft jet engine community.
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