ENGINEMAN 1 & C2. The assistant chief observers assist the chiefobservers as directed; supervise the performanceof the observers; check the taking of fuel oilsoundings and meter readings; and make out thetrial reports.3. Assistant observers take fuel soundings,meter readings, counter readings, the ship’s draft,and collect all other data that may be requiredfor the trial reports.The following items should be accomplishedor considered before starting the trial:1. When requested by the observing party, theship under trial should provide or designate asuitable signaling system so that fuel soundingsand the readings of counters and meters may betaken simultaneously.2. The ship under trial should furnish thechief observer with a written statement of the dateof last undocking, and the authorized and actualsettings of all main machinery safety devices anddates when last tested.3. The ship should have its draft, trim, andloading conform to trial requirements. In case aleast draft is not specified, the liquid loadingshould equal at least 75% of the full load capacity.4. The chief observer should determine draftand trim before and after the trial, verify theamount of fuel on board and correct this amountof the time of beginning the trial. The draftobserver should also determine the rpm requiredfor the full power trial, at the displacement andinjection temperature existing at the start of thetrial.5. The observing party should detect andpromptly correct any errors in recording data,since it is important that the required data be cor-rect within the limits of accuracy of the shipboardinstruments.6. The chief observer should instruct membersof the observing party to detect any violation oftrial instructions, of instructions in the NavalShips’ Technical Manual, or of good engineeringpractice, and then verify any such report and pro-vide the commanding officer or a detailed accountof each violation.MANNER OF CONDUCTING TRIALS.—Some of the requirements in regards to themanner of conducting full power and economytrials are as follows:1. Unless otherwise ordered, a full power trialmay be started at any time on the date set.2. The trial should be divided into hourlyintervals, but readings should be taken andrecorded every half hour. Data are submitted ashourly readings in the trial report.3. Fuel expenditures for each hourly intervalof the trial should be determined by the most ac-curate means practicable, normally by meterreadings corrected for meter error and verified bysoundings.4. The appropriate material condition of theship should be set during the different trials.5. During all trials the usual “housekeeping”and auxiliary loads should be maintained and theminimum services provided should include nor-mal operation of the distilling plant, air com-pressor, laundry, galley, ventilation systems,elevators (if installed), and generators for light andpower under load conditions similar to those re-quired for normal operations at similar speedsunder the prescribed material condition.6. All ships fitted with indicators, torsion-meters, and other devices for measuring shaft orindicated horsepower should make at least twoobservations during the full power trial to deter-mine the power being developed.7. The chief observer’s report of the trialshould state whether all rules for the trial havebeen complied with.SOME HINTS IN REGARD TO FULLPOWER TRIALS.—There are special formsused for full power and economy trial reports.Illustrations of these forms are not given in thistraining manual, but you can obtain copies fromyour log room, and in this way get an idea of thedata and readings that are required for full powerand economy trials.Trial forms, and such items as tachometers,stop watches, and flashlights, should be availableto the observing party and to the personnel whotake readings. Any gages or thermometers whichare considered doubtful or defective should bereplaced before trials are held. A quartermastermust check and adjust all clocks in the engineer-ing spaces and on the bridge before any trials areheld.2-52
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