What to do on a sea trial

I. Before the trial voyage, should pay attention to the problem and the ship should have the conditions

The trial voyage before the ship engine personnel should pay attention to the problem: first of all, to carefully read the engine trial voyage syllabus, to understand the content of the test items and experimental methods; Secondly, carefully familiarize with the factory to develop trial voyage program and trial voyage timetable, and make reasonable arrangements for the engine personnel of the test project specific division of labor; Thirdly, for the trial voyage to participate in the engine staff This is a good opportunity to familiarize with the ship's equipment, so we should seize the key items and use the short sea trial time to fully understand the basic technical condition of the equipment; Fourth, the engine personnel shall not adjust the equipment at will during the trial voyage, if there is any doubt, we can raise it to the factory's supervisors and ask for an answer until we fully understand it; Fifth, for the problems found during the trial voyage and the opinions for improvement, the problems and opinions should be recorded and submitted to the supervisory group for negotiation and settlement with the factory in written form. The group will negotiate with the factory to solve the problem.

Conditions to be met before sea trial: Firstly, the ship's electromechanical equipment/conducting equipment/living accommodation equipment should be fully installed, and the dock mooring test program should be completed (the inclination test should also be completed for the first ship); secondly, sufficient fuel oil/materials should be stocked up, and the relevant information and necessary measuring tools should be prepared.

II. In the trial voyage, the test items and test methods of the turbine equipment

(Note: For the convenience of presentation, according to the trial voyage plan formulated by the factory and the trial voyage schedule to analyze item by item.)

1. Rescue boat/lifeboat launching test: (this test takes about 1 hour) when the main engine rotates to 45 RPM and the boat speed reaches 6.6 knots, the rescue boat/lifeboat will be released to the water surface and run on its own with the hook off to check the performance of rescue boat/lifeboat respectively. After each performance meets the requirement, put the boat back to the position.

2. Main engine smooth running test: (test time is about 4 hours and 20 minutes) When the ship is in sailing condition, the main engine is running continuously at 50%/65%/75%/85%/90%/100% load to check the installation quality of the main engine and auxiliary equipments directly serving the main engine and the reliability of the running work, and to measure the actual power generated by the main engine. At the same time, observe and record the parameters of each cylinder under rated working conditions compared with the standard parameters should not exceed the specified range.

3. General and fire alarm test: (the test time is about 40 minutes)

1) General alarm test: during the voyage, press the general alarm test button on the bridge, and the alarms will sound everywhere on the ship.

2) Fire alarm test: During the voyage, the test was conducted above the main engine cylinder head in the engine room, above the payloader, in the control room, and in the corridors on each floor of the living quarters, and the alarms sounded everywhere on the ship. (Note: the control room for the heat detector, other places for the smoke detector)

4. Boiler pressure storage test: (test time of about 15 minutes) when the host is running at 100% load, close the main steam valve, while the boiler in the state of continuous ignition combustion, when the determination of the boiler safety valve jumping ability. Specific requirements are, the boiler in the safety valve within 15 minutes of the rise in steam pressure shall not exceed 10% of the boiler design.

5. Anchor test: (test time is about 45 minutes) the ship should be in the case of ready to stop the wind, and the water depth of more than 85m. Under the control of the anchor motor, firstly, one of the anchor claw is slowly released to the water surface, and then disengage the anchor chain clutch, and then brake 2-3 times continuously during the anchor chain's rapid entry into the water to confirm the brake function. The same method can be used to test the function of the other anchor. When starting the anchor both anchor chains can be lifted and placed into the anchor chain bucket at the same time. During the test, observe and record the start time/measure the depth of water/average anchor lifting speed/observe the pressure of the hydraulic oil pump; at the same time, check the moving parts of the hydraulic system for any abnormal heat/knocking/leakage phenomena and make sure that it meets the requirements of the test and the manual.

6. Main engine minimum speed operation test: (test process is about 10 minutes) the main engine in the minimum speed stable operation, the rudder angle indicator from one side of the maximum rudder angle to the other side of the maximum rudder angle, to determine that the main engine will not appear to stop and a single cylinder flameout phenomenon. Then the ship in a straight line sailing state to determine and record the following data: main engine speed / turbine speed / sweep pressure / joystick scale and the ship's speed at this time.

7. Loss of power test: (test process about 10 minutes) the ship in single generator power supply sailing state, artificially disconnect the generator's main switch caused by the ship's power loss. In this case the standby and emergency generator should be automatically started in accordance with the set procedure to close the power supply, the maximum time of power loss shall not exceed 45 seconds; standby main generator after closing the power supply, part of the auxiliary electrical equipment began to automatically start the sequence, the start-up sequence and time should be recorded, in order to confirm that meets the design requirements.

8. Stern shaft torsion test: (only for the first ship to test, the process of about 1 hour) the use of torsion analyzers to measure and record the main engine from the minimum speed of every 2-5 revolutions of the torsion value of the continuous output of the maximum and measure the analysis of the chart to confirm that the measured torsional vibration speed range and the range of the calculations should be the same. During the navigation test, the operation/sound/vibration/lubrication/sealing of the shaft shall be checked and confirmed to be in accordance with the design requirements.

9. Rudder and emergency rudder test: (the test process is about 50 minutes) the rudder should be the ship's maximum speed forward for the test of the main steering device, the test of the two rudders should be alternated. This shall be done by:

1) Turning the rudder angle indicator from 35° on one side to 35° on the other side while the ship is proceeding at full speed (111 rpm) and shall be able to turn the rudder angle indicator from 35° on one side to 30° on the other side within 28 seconds.

2) When the vessel is proceeding at half speed (56 rpm) and at a speed of not less than 7 knots, the rudder indicator shall be capable of being turned from 15° on one side to 15° on the other side within 60 seconds and shall be flexible.

3) Under emergency generator power only, when the vessel is moving at half speed (56 rpm) and at a speed of not less than 7 knots, the emergency steering device shall be capable of turning the rudder angle indicator from 15° on one side to 15° on the other side within 60 seconds with flexible operation.

During the whole test, the hydraulic system and all moving parts shall be free from abnormal heat/vibration/knocking/leakage, etc., and the data of the oil pump's rotational speed/oil pressure/oil temperature/viscosity as well as the ship's speed shall be recorded, which shall meet the requirements of the instruction manual.

10. Crash stop reversing test: (only for the first ship, the process is about 20 minutes) when the main engine is sailing at the maximum speed, in the driver's station, the clock handle from "NAV. CRASH ASTERN" (main engine speed is 80 rpm) until the vessel comes to a complete stop. Observe and record the camshaft reversal/brake start air supply/start air cutoff/full speed reverse times and the main engine rpm/heading/wind speed/wind, etc. at each point during this process.

11. Main engine control test on the driver's station: (test process about 1 hour and 30 minutes) the test process includes the following aspects:

1) motorized navigation remote control test: on the driver's station will be the car clock handle from the "STOP" position, and gradually increase to the "FULLASTERN" position, the "FULLASTERN" position will be the "FULLASTERN" position. FULL ASTERN" position, then quickly push down the "D.SLOW AHEAD" position, and gradually increase to the "FULL AHEAD" position, then quickly push down the "FULL ASTERN" position. "FULL ASTERN" position. Observe and record the rotational speed of the main engine in this process in each working condition/reversal time/setting value of the governor/tooth scale of the high-pressure oil pump, etc. The purpose is to assess the performance of the main engine's remote control system when motorizing the vehicle.

2) host automatic program control plus / minus load test: in the driver's desk will be the car clock handle from the "STOP" position, gradually pushed to the "FULL AHEAD" position, and then pushed to the "NAV. FULL" maximum position. Then pull the clock handle from "NAV. FULL" maximum position to NAV. Test should be recorded in the host speed, the acceleration / deceleration process time, observe the host automatic control process is smooth, the actual acceleration / deceleration process is consistent with the design requirements, and to confirm that the host automatic acceleration / deceleration inflection point rotational speed value, as well as the automatic program control acceleration / deceleration can be quickly through the *** vibration zone.

3) Host automatic program control cancellation test: the host in the automatic program control of load increase / decrease process, in the console press the "PROGRAM BY-PASS" button, the host automatic program control is canceled, this time the host's rotational speed will rapidly increase / decrease.

4) Host flying test: in the driver's console, the host speed control at 86 RPM or so, press the "STORMY" button, and then increase the host speed to 107 RPM, at this time, the host speed will be automatically reduced, and the driver's console and the cabin control room indicator light. When the main engine speed is reduced to about 86 RPM and reset automatically, the indicator light will turn off, then increase the main engine speed to 107 RPM again, the above process will be repeated.

12. Main engine forward speed test: (test process about 2 hours and 40 minutes) in the test process the main engine was running at 106/111 RPM for a period of voyage, observe and record the ship's heading/voyage/speed; wind speed/direction/wind force; main engine output RPM/power; main engine/auxiliary engine temperature and pressure parameters, etc. during the test.

13. Unmanned Cabin Operation Test: (the test process is about 4-6 hours) under the control of the bridge, the main engine uses heavy fuel oil and operates under 100% and 50% load conditions respectively, the test is mainly to detect the continuous reliability of the cabin equipment operation, the test is conducted according to the results of the record of the cabin alarm recorder for assessment, in principle, no alarms related to propulsion equipment are allowed. During the whole test period, except for the surveyor and designated personnel, other personnel are not allowed to enter the engine room control room without permission, and the personnel who are allowed to enter the engine room control room are not allowed to touch any electromechanical equipment.

14. Ship's endurance test: (the test process is about 2 hours) the main engine uses heavy fuel oil and runs continuously under normal load condition, in order to check the quality of installation/reliability of operation/reliability of operation of the main engine and auxiliary equipments directly serving the main engine. Observe and record the temperature/pressure/necessary data/rotational speed of the main engine/power of the main engine, etc. of the main engine and auxiliary equipment every half an hour.

15. Measurement of main engine fuel consumption rate: (Measurement process about 1 hour) Since the main engine fuel consumption rate has been measured in the workshop test, the value measured in the sea test is only for reference. The test is usually measured with a flow meter installed on board, and the main engine is running on heavy fuel oil and sailing under loaded continuous power output (CSO) condition for one hour. Observe and record the main engine power/fuel oil temperature/flow meter reading/time etc.

Actual fuel consumption shall be converted to ISO standard low calorific value fuel consumption (10200 kcal/kg) by the following formula:

Mfr = (V x rt x 1000) / BHP x H / 10200; r t = 1 / [1+0.0007(t-15)] x r15°C

In the formula: Mfr - low calorific value of 10200 kcal/kg fuel consumption rate (g/BHP/Hr);

V - fuel flow rate calculated from flow meter and stopwatch readings (Lit/Hr);

rt - specific gravity of the fuel at the measured temperature (Kg/Lit);

H - low calorific value of the actual fuel (kcal/kg);

H - low calorific value of the actual fuel (kcal/kg);

The fuel consumption rate is calculated from the flow meter and stopwatch readings (Lit/Hr). kg);

r15°C - fuel density at 15/4°C (Kg/Lit);

BHP - brake horsepower;

t - actual temperature of the fuel (°C).

16. Measurement of water production volume of water-making machine: (Measurement process is about 1 hour) The main engine uses heavy oil and under normal load condition, run the water-making machine for one hour, check the audible and visual alarm function of the salinity monitoring system and the automatic control system of water level. Observe and record the vacuum degree and evaporation temperature of the water maker/the temperature and pressure of the condenser seawater inlet and outlet/the temperature and pressure of the cooling water of the cylinder liner of the host machine/the pressure of the vacuum pump inlet/the pressure of the condensate pump outlet/the readings of the flow meter, etc., every half an hour.

17. Waste gas boiler evaporation measurement: (the measurement process is about 1 hour) in the boiler water piping system on the temporary installation of a calibrated flowmeter, when the host computer using heavy oil and under normal load conditions, the use of the host computer's exhaust gas exhaust gas exhaust gas to make the exhaust boiler running for an hour of continuous operation of the case for measurement. Observe and record the boiler steam pressure / water level / boiler flue inlet and outlet of the exhaust gas temperature and pressure / boiler feed water temperature, etc., the measured evaporation is required to be greater than the design requirements, and to meet the needs of the ship's actual work.

In the specified feed water temperature, the evaporation of exhaust gas boiler should be calculated according to the following formula:

W = H / (SI1-I1); H = W1 x (SI2-I2) x r;

In the formula: W --- boiler evaporation of feed water at 60 ℃ (kg/hr);

H --- heat of the steam (kcal/hr );

SI1---Enthalpy of steam at 0.54 MPa (kcal/kg);

I1---Enthalpy of feed water at 60°C (kcal/kg);

W1---Volume of feed water (Lit/hr);

SI2---Enthalpy of steam at actual pressure (kcal/kg);

I2--- Enthalpy of feed water at actual temperature (kcal/kg);

r--- Specific gravity of feed water at actual temperature.

18. Tests of other items in the course of sea trial:

1) emergency operation test of the main engine: operate the main engine at the side of the engine, complete the whole process of starting/stopping/reversing the main engine as well as accelerating/decelerating the engine step by step, and make sure that the main engine emergency engine-side operation device and the clock system are functioning normally.

2) Host remote control system power loss test: when the host remote control system AC power loss, the emergency battery will automatically supply DC power, the host remote control system is not affected by the loss of power, and the alarm system alarm function is normal.

3) Fuel switching test of main/auxiliary engine: the switching test of light/heavy fuel shall be carried out according to the requirements during the test flight, and the utility test shall be carried out for the equipment such as preheating/viscosity control of heavy fuel.

4) Functional test of auxiliary equipments of main/auxiliary engines: pumps, auxiliary equipments and submarine valves serving main/auxiliary engines shall be used alternately and their functions shall be checked in the trial voyage.

Three. After the sea trial, should test the project and complete the work

1. After the sea trial, the engine personnel should test the project:

1) lifting cylinder inspection: choose a host of a cylinder, by the shipyard personnel to lift the cylinder cleaning, inspection of the cylinder head/exhaust valves/cylinder liner/piston/piston ring/purge port/cylinder oil distribution, etc. At the same time, loosen the transmission chain of the host, and the auxiliary equipment and submarine valves should be used interchangeably and check their functions. At the same time loosen the main engine drive chain lock nut for readjustment.

2) Kringle Crane Test: Firstly, carry out the test of lifting weight, lift 35 tons of weight for starting/falling/braking/rotating operation, and require the Kringle Crane to run smoothly; then carry out all kinds of limiting (***7 items) alarm test, and require the limiting alarm function to be normal. Observe and record the weight/running speed/rotation radius/brake function/hydraulic oil pressure, etc., at the same time check the hydraulic system moving parts should be no abnormal heat/knocking/leakage phenomenon.

Note: The test items during the sea trial of the ship are strictly checked and confirmed by the surveyor of the classification society.

2. After the sea trial, the engine crew should complete the work: the problems and suggestions found during the sea trial should be submitted in writing to the shipyard at the meeting after the sea trial to solve as soon as possible. (Such as: check all the electromechanical equipment/various piping systems, etc. whether there is abnormal vibration/sound/temperature rise, etc.; instrumentation/valves, etc. whether it is easy to observe/operate; equipment, various signs/safety warning signs, etc. whether complete/correct; high-temperature equipment/exhaust pipe, etc. whether the heat is insulated and protected; machinery and equipment/oil-water piping, etc. whether there is a leakage phenomenon, etc.).