SEA TRIAL KINDS OF TEST

AND CONDITIONS

KINDS OF TEST ON SEA TRIAL:

1. Starting Test

2. Stop Inertia Test

3. Progressive speed trials

4. Crash Stop astern and Crash stop ahead test.

5. Turning test

6. Zigzag Maneuvering test

7. Steering Gear test

8. Anchoring test

9. Black Out

10. Endurance Test

11. Noise and Local Vibration

12. Fire Fighting Equipment test (additional)

13. Life Saving Appliances Test (additional)

SEA TRIAL CONDITION

Items to carry out before sea trial:

a. Ballast Condition: • Ballast condition to the full displacement

to deliver full resistance on design condition.

b. Draft Measurement:• Draft reading: fore, aft, mid-ship ps & sb.

For calculation of resistance and power of ME

• Specific gravity of sea water

c. Life saving appliances check. • To ensure safety of the personnel onboard

during sea trial

1. STARTING TEST

1. Starting test to be carried out as per Class Rules for starting system of the main engine.

a. For reversible engine, the staring system shall capable for 12 times start,

b. for non-reversible engine for 6 times.

2. For electric starter: the starting system is to be confirmed to start as engine manufacturer guidance.

3. Items of Measurement:• Total number of starting• Functional test confirmation

2. MAGNETIC COMPASS ADJUSTMENT

• The adjustment of magnetic compass shall be carried out prior to sea trial according to standard from technical engineer and certified on behalf of the government / statutory.

• The vessel is in standstill position• Location of the compass adjustment is to be at

safe location and far from metal buffer area

3. STOP INERTIA TESTPurpose:

To measure required time and distance, measured from the time that ME (full throttle position) to be stopped until the vessel’s speed reaching to two (2) knots.

Procedure:While the vessel is running ahead at MCR (100% engine load, or 100% Rpm), the main engine to be stopped until the vessel reach two (2) knots speed

Items to measure:1. Vessel’s speed before the main engine to be stopped (at

full-throttle or at 100% load or at 100% rpm).2. Time required until vessel speed reaching 2 knots after

main engine to be stopped.3. Advance distance from full speed to 2 knots speed (at

stopped main engine condition).4. Wind speed, wind direction, and sea condition.

4. PROGRESSIVE SPEED TRIALS

Purpose: The test to be carried out with the engine load progressively increased in order to settle the relation between vessel’s speed and engine loads.

Place: On the availably safe sea area.

Procedure: Progressive speed trials are to be carried out at the following engine load:

Items of Measurement:

• Vessel’s speed

• Main Engine parameters; Rpm, Throttle position, and other necessary items

• Weather, sea state condition, relative velocity, direction of wind, and depth of sea.

Engine Load Engine Power Engine Rpm Run between Mile posts

25 % As calculation As on panel One-double-run

50 % As calculation As on panel One-double-run

75% As calculation As on panel One-double-run

100% As calculation As on panel One-double-run

5. CRASH STOP AHEAD and CRASH STOP ASTERN

Purpose: To prove that the Main Engine is suitable for ship’s emergency stop, and to measure the time and distance between points of the order of astern / ahead under headway until Rpm becomes steady.

Stop Astern Test Procedure :i. While the vessel is running ahead at 100 % Engine

load (corresponding to its MCR) the Main Engine is then ordered to reverse its RPM from initial rpm until the RPM is reaching steady.

ii. Handling the Main Engine for Stop Astern Test: see table below

STOP ASTERN TEST PROCEDURE:

NO COMMAND SPEED CONTROL HANDLE RPM METER

1 Start ahead 100% load To steadily reach at rpm MCR (ahead)

2 Order for the Stop Astern Test

For Conventional Shafting: Stop the ME, change to the reversed Rpm, start the engine, increase rpm progressively to the MCR.

For SRP: Move the SRP handle from

0o gradually up to reaching 180 o

To reach reversed rpm steadily at MCR astern (referring to the Engine Maker)

3 Stop Test For Conventional Shafting: Stop the ME, change the rpm to the initial Rpm, For Steerable Rudder Propeller (SRP): Move the SRP handle from 0o gradually up to reaching 180 o

5. CRASH STOP AHEAD and CRASH STOP ASTERN

Items to be measured:(1) Measurement on Stop Astern

Test:i. Vessel’s speed each 10 second

interval by Speed Log on the wheel house.

ii. Vessel’s heading angle each 10 second interval by Gyro compass.

iii. ME rpm each 10 second interval correspondingly.

iv. Wind direction and velocity, weather state, and sea depth at the beginning of the test.

v. Time elapsed from signal “full-astern” to the complete stop, i.e. from the Main engine to be stopped → engine begins to rotate astern → up to the vessel is completely stopped.

(2) Measurement on Stop Ahead Test:

i. Vessel’s speed each 10 second interval by Speed Log on the wheel house.

ii. Vessel’s heading angle each 10 second interval by Gyro compass.

iii. ME rpm each 10 second interval correspondingly.

iv. Wind direction and velocity, weather state, and sea depth at the beginning of the test.

v. Time elapsed from signal “full-ahead” to the complete stop, i.e. from the Main engine to be stopped → engine begins to rotate ahead → up to the vessel is completely stopped.

6. TURNING TEST

Purpose:To examine the vessel’s turning maneuverability, maximum

advance, and maximum tactical diameter of turning.

Procedure:Turning test shall be measured at 100% Main engine Load (full-

throttle) then the steering rudder to be moved maximum (as per design) to the starboard and portside, and the position to be kept until the vessel reach the turning of 360O from the original course.

Items to measure:i. Vessel’s speed each 10 second interval by speed logii. Vessel’s heading angle each 10 second interval by gyro

compass iii. Shaft rpm each 10 second interval accordinglyiv. Wind direction and velocity, weather state, and sea depth at

the beginning of the test.v. Tactical diameter and advanced diameter.

7. Z-MANEUVERING TEST (ZIGZAG TEST)

Purpose:To examine the ship’s course stability and how the ship responds

to the changes of rudder angle

Procedure:Having the vessel initially in full-ahead-speed on 100% MCR, the

Zigzag test is to be carried out, as follows:i. Direct the vessel to the heading 20O starboard. ii. When the heading of the vessel has been reaching 20O to

the starboard from the initial course, portside the helm 20O iii. When the heading of the vessel has been reaching 20O to

the portside from the initial course, starboard the helm 20O iv. Repeatedly, carry out the step no ii.v. When the vessel’s heading return to initial course, the test is

finished.

7. Z-MANEUVERING TEST (ZIGZAG TEST)

Items to be measured:• Vessel’s speed each interval 10 second by means of

speed log.• Vessel heading angle of each swing by means of

gyrocompass.• Maximum heading angle of each swing by means of

gyrocompass.• Shaft rpm each 10 second respectively.• Wind direction and velocity, sea state, and sea depth at

the beginning of the test.• Required time for each change and holding of rudder

angle (start and stop of the actual rudder motion against the response of the actual vessel motion)

Turning test and Zigzag test

8. STEERING GEAR TESTPurpose:• To examine the capability of the steering gear system and the

redundant system of the steering gear.

Procedure:a. Simulation test for redundancy arrangement to be carried out

to verify that, upon any single failure, the propulsion and steering system remain in operational, or the back-up propulsion and steering system shall be speedily brought into service.

b. For emergency steering gear test, the propulsion and steering system must be able to be operated by local system or local panel in the steering gear room.

Test Items:i. Functional test of each back-up system of the steering gear

system by means of local control in the steering gear room. ii. Wind direction and velocity, sea state, and sea depth at the

beginning and the end of the test.

9. ANCHORING TEST (1) Purpose: To examine the performance of Windlass.

Place and Condition:• The vessel is to be brought to a standstill condition and headed into

the wind before commencing the test,.• The test is to be done in the deep water area where sufficient for 3

shackle of anchor chains.

KIND OF TESTS:1. Loading Test:

The windlass shall be functionally tested by hoisting up 55 mm (2 fathoms) of chains from the state in which 82.5 (3 fathoms) of anchor chains are submerged and freely suspended at commencing of lifting.

2. Chain Drum Brake Test:The chain drum brake shall be tested with the anchor dropping at every approximately ½ fathoms of chains to confirm safe paying out and holding of the anchor chains by means of braking the chain drum.

9. ANCHORING TEST (2)

Procedure:a. Drop the starboard anchor by releasing the brake of the windlass,

and approximately 82.5 m (3 fathoms) of starboard anchor chains shall be run into water. While dropping in progress, the anchor brake shall be tested.

b. Hoist 55m (2 fathoms) of starboard anchor chains by means of windlass.

c. Drop the portside anchor by releasing the brake of the windlass, and approximately 55 m (2 fathoms) of portside anchor chains shall be run into water. While dropping in progress, the anchor brake shall be tested.

d. Hoist 27.5 m (1 fathoms) of portside anchor chains by means of windlass.

e. Hoist 27.5 m (1 fathoms) of both sides anchor chains and anchors.

Items of Measurement:a. Weather, wind velocity and direction, and water depth.b. Hoisting speed (required time for hoisting 1 fathoms).

10. BLACK-OUT TEST

Purpose:• This test is to be done during the sea trial, to ensure the

safety of the vessel on the loss of electric power for automatic starting and connecting Main Switch Board of the Standby Generator.

Items of measurement:• Required time to start and to connect Main Switch Board of

the standby generator after loss of the electrical power supply.

• Functional tests on electronic equipments that shall be still in power during black-out conditions.

11. ENDURANCE TRIAL

Purpose:• To examine the Main Engine endurance

performance in continuous operation of Service Continuous Rating, and

• To measure performance of the Main Engine in terms of Power, RPM, Fuel Consumption, and durability.

Procedure:• Endurance trial shall be carried out for at least six

(6) hours continuous operation at NCR (85% MCR). • During the endurance trial, Fuel Consumption of

Main Engine shall be measured for operational reference.

Items of measurement:• Vessel speed & heading direction• Fuel Oil consumption by means of flow meter.• Shaft revolutions.• ME rpm• Main Engine load / power• Other necessary data regarding Main Engine

performance such as: • Cooling temperature (in & out) and flow rate• LO pressure & LO temperature (in & out) • Exhaust gas temperature• Air and ambient temperature in Engine room• etc

11. ENDURANCE TRIAL

12. NOISE TEST (1)

General:During official sea trial, measurements of noise levels is to be done

in all spaces of private cabins on Accommodation Decks, Wheelhouse, and Machinery Spaces. Noise levels are to be recorded and submitted to the ship owner and other parties concerned. One copy of the record shall remain onboard.

Conditions of Measurement:The noise is to be measured under following conditions:a. Main propulsion machinery shall be run at Normal

Continuous Rating.b. Other auxiliary machineries, navigation instruments, etc, shall

be operated throughout the measurement period as required for normal seagoing condition during sea trial.

c. Mechanical ventilation and air condition equipment shall be in normal operation, taking into account that the capacity is in accordance to the design conditions.

d. All doors and windows of rooms are to be closed.e. Spaces shall be furnished with all necessary equipment.

Measurement without soft furnishings may be made, but no allowance shall be made for their absence.

f. The depth of water under the vessel’s keel and the presence of large reflecting surfaces in the ship’s vicinity may affect the readings obtained, and shall be, therefore, be noted in noise survey report.

g. The meteorological conditions such as wind and rain, as well as sea state, shall be such that they do not influence the measurement.

12. NOISE TEST (2)

12. NOISE TEST (3)Measurement procedure:• During the noise level measurements, only those of concerned in ship

operation and noise measurement are allowed to present in the measured spaces.

• The sound level meter shall be calibrated with the calibrator before and after measurements. The batteries shall also be checked immediately before each period of use.

• Readings of sound pressure level shall be taken in decibels using an A-weighting filter: dB(A).

• The meter shall be set to slow response and the readings made only to the nearest decibel. A measuring time of at least 5 seconds shall be allowed. If a meter fluctuate in level within a range of no more than 5 dB(A) maximum to minimum, an estimation of the level shall be made by averaging by eyes.

• If the range fluctuations are in excess of 5 dB(A) or the sound is cyclic, irregular or intermittent in operation, an integrating meter shall be used set to A-weighting. Integration shall be made over a period of at least 30 seconds.

• At positions of high noise, spot checks shall be performed with the meter set to “fast” response if considered necessary, to ensure the safety of a person taking measurement.

12. NOISE TEST (4)

Measurement Positions:The measurements are to be

taken on deck in the center of the room. Measurements shall be taken at positions as follows:

• Engine Room:Measurement shall be taken at four (4) representative positions per each deck level in engine room to upper deck.

• Pump Room:Measurement shall be taken at four (4) representative positions per each deck level in pump room.

• Navigation Spaces:Measurement shall be taken with all auxiliary equipment such as radar, echo sounder, window wiper, clear view screen, etc in operation. However, audible signals, telephone or similar need not to be taken into consideration.

• Accommodation Spaces:Generally, one measurement shall be made in the middle such as cabins, hospital, office, mess room and recreation room.

• Service Spaces:The service spaces such as galley, pantry, and laundry, are to be measured. However, the measurement may be done without equipments in operations.

General:• This procedure describes the measurement of vibration response of

accommodations spaces. The purpose of measurement is to find out the vibration level and to investigate the dynamic characteristic of the ship.

Procedure:a. Measuring acceleration and vibration frequency at the direction of

transversal and vertical at the priority points A, B, and C, which measured at each rpm of the Main Engine. The objective is to find the Resonance Frequency Point.

b. Measuring acceleration and vibration frequency at the direction of transversal and vertical at points of accommodations and engine room. Measurement is to be carried out at NCR.

c. Velocity of vibration shall be measured with a portable Vibration-meter. The measurement shall be carried out not in simultaneous way but one by one.

Measurement Positions:a. Machinery spacesb. Navigation spacesc. Accommodation spacesd. Service spaces

13. LOCAL VIBRATION TEST

14. FIRE FIGHTING EQUIPMENT TEST

Purpose:• This test is to be performed during sea trial, to ensure the

Fire Fighting Equipment are readily well operated.

Items of Measurement:All fire fighting equipment shall be functionally tested,

including:• Fire main hydrants on decks and accommodation deck• Some portable fire extinguishers.• Fire alarms and fire detectors in all rooms• Emergency fire pumps.

15. LIFE SAVING EQUIPMENT TEST

Purpose:• This test is to be performed during

sea trial, to ensure the Live saving Equipment can be well operated.

Items of Measurement:Some of life saving equipment shall be

functionally tested, including:a. Life boats:

• Life boat is to be fully loaded in accordance to persons capacity.

• Lowering davits in loaded condition by means of local handle inside the life boat.

• Releasing life boat from davits by means of local handle.

• Starting up onboard engine in the lifeboat.

• Test of maneuvering of the life boat (turning and zigzag)

• Rechecking provisions that required to be provided onboard.

b. Life rafts:• Checking hydraulic

release units and validating expire date.

• If necessary, launching the life raft for simulation.

c. Life buoys:• Check the number and

availability on the approved on-board-location as per stated on the Safety Plan

• Simulation of ‘man over board’ function.

d. EPIRB and SART equipment:• Check expired date • Check battery power• Check transmitted signal

on the navigation equipments.