DP CPD

The below graph shows a vessels DP capability after worst case failure. The vessel is in a DP class 2 operation and the vessels heading is 210 degrees. Wind direction is 230 degrees, wind speed is 35 knts and current is 1 knot coming from same direction as wind. How would a current speed increase to 2 knots affect your capability at your currente heading. Vessel will not be able to maintain heading. Vessel will hold position and heading but will operate without redundancy. Vessel will hold heading but not will be able to maintain position. Vessel will not be able to hold position and heading.

Can i check for the Az and elevation of correction satellites before entering 500m?. Yes, and this needs to be verified every time you are alongside due to masking signals by the structure / Yes, depending on your equipment, using your Demodulators on our DEPS menu pages. You can but it is unnecessary. No you need to call NASA to get information of that type. No, this takes too much time to accomplish.

For worst case single point failure during operation, the online consequence análisis continually performs an analisysis of the vessels ability to: Show that the position reference offset is correct. Hold position after a single failure. Maintain its headingand the drift direction. Carry the right amount of ballast wáter.

During shallow Waters operation with no other platform within 500 meters, in depths of less than 50 meters, choose from the following list the best PRS to use for a DP class2 vessel: Tautwire. Radascan. GNSS. HPR.

Should the backup/emergency RPM/Pitch control work when the DP changeover switch is in the DP position?. Yes, the backup RPM/PITCH should work the changeover switch in the DP position. Your vessel might not have the capability if only half the generators are running. Loss of position is not to occur in the event of a single fault in any active component or system. no, the back up rpm no will control when the switch is in the dp position.

For full diesel-electric vessels with four generators only operating with two generators running, will it have the full capability as per the vessel Capability Plot?. Yes, the backup RPM/PITCH should work the changeover switch in the DP position. Your vessel might not have the capability if only half the generators are running. Loss of position is not to occur in the event of a single fault in any active component or system. Your vessel might not have the capability if only half the generators are running.

What are the IMO statements on equipment Class 2 vessels?. Show that the position reference offset is correct. Hold position after a single failure. Maintain its headingand the drift direction. Loss of position is not to occur in the event of a single fault in any active component or system.

What is ASOG?. Activity Specific Operational Guidelines – This is how set your vessel up for the current activity. Hold position after a single failure. Maintain its headingand the drift direction. Loss of position is not to occur in the event of a single fault in any active component or system.

"Can a network storm affect the position holding of the vessel?. Yes, a problem with a network storm could cause a DP system to reject all thrusters. .

In an emergency, will the DPO have to review the ASOG?. No, the DPO should have already studied the ASOG and know what action to take. Yes, a DP Officer (DPO) must review the ASOG (Activity Specific Operating Guidelines) in an emergency, as it provides crucial, detailed guidance on how to respond to the specific situation, including equipment failure, status changes, and necessary actions to ensure the safety of the vessel.

If there is a problem with the main DP system, will the independent joystick operate (IJS)?. The independent joystick should be independent of the main DP system and work if main DP system has a complete failure. .

When should a relative position reference system be set to ¨FIXED¨ in the DP system?. When the DP system is using the position reference to hold the position and heading. .

What is IMO 1580, and what information does it contain?. Guidelines for operating DP vessels. .

What is the minimum number of bow thruster required for DP Classes 2 vessels?. Two bow thruster to provide redundancy. .

Do all the DP system require network storm testing?. Yes to test if a network storm will affect the DP network. .

What is a network storm?. When there is too much false data, it blocks the use of the network system. .

Are DP vessels required to carry type-specific maintenance manuals for DP system, position reference system, and all associates systems?. Yes. NO.

What is a worst-case failure (WCF)?. A failure that causes the maximum loss of equipment, but the vessel still holds its heading and position. .

Are all RAdius or RadaScan transponder intrinsically safe?. ALL RadaScan transponders and Radius ¨X¨ are intrinsically safe. .

What is CAM?. Critical activity mode when the vessel is set up as class two or three redundancy. .

What information is in IMCA 117?. "IMCA 117 contains information about DPO training and the manning levels on DP vessels. ". .

Can I operate a vessel with the main bus tie closed if it´s listed in the ASOG?. Only if the FMEA also states the vessel can be operated with closed bus. .

What is the max generator load during class 2 operations for all DP equipment Class 2&3 vessels as per IMO 1580. Sufficient power to hold heading and position after a WCF. .

FMEA is Failure Modes Effect Analysis document a standalone document?. Yes, the vessel FMEA is a standalone document. The FMEA proving trial document is a supplement document to support the FMEA. .

What is the DNV current standard for Capability Plots?. The DNV current standard is DVVGL-ST-0111. .

What is the different between fixed and mobile mode on a relative reference system?. A relative reference system needs to be set on fixed if used in the DP system as a position reference. .

What action would you take if you have a failure of one of the 2 bow thruster fitted on a Class 2 vessel working inside 500 m?. Stop operations and move the vessel to a drift-off location outside 500m. .

Can a 24v cross-connect cause a complete blackout?. Only cross connection on 440 volts will cause a blackout. .

What is redundancy?. A second system for the same task, i.e., like two bow thrusters. .

What may be a prominent reason for DPO to make a decision to activate RED ALERT on a class 2 DP vessel?. The can hold position but has a WCF. .

What DP drill should I do onboard?. DP drills will be listed in the company safety management system if not used for drills listed in IMCA M 117. .

Will a position reference system that is selected as the reference origin be given any more priority than other reference system in the DP controller program. No, all position reference are treated the same value based on weighting. .

The value of the DP Current on the DP Operator Station is likely to be different from the true tidal stream or current. A possible reason for this is: A temperature Inversion in the water column. An Unknown external force acting on the vessel and /or and unmeasured error within the DP system. Failure of the Motion Reference Unit(s). Operating in shallow water.

What is the advantage having the bus tie breaker in the closed position on a DP class 2 vessel?. to reduce the workload on the DPOs. To provide power for the galley, ensuring that hot food is always available. To ensure that a fault on one side of the switchboard does not transfer to the other side. To allow sharing of power loads between all running generators/ alternators.

One of 3 bow tunnel thrusters on a Class 2 DP vessel fails to zero thrust while the vessel is conducting: diving operations. The DPO should advise dive control and: Continue operations as there are 2 bow thrusters remaining. Safety discontinue operations and conduct a risk assessment before continuing operations. Immediately change to independent joystick control. Only discontinue operations if the engineers indicate they are unable to repair the thruster.

Wind sensors were deselected from the DP system due to operational requirements- What is the likely consequence if the wind changes direction prior to reselecting the wind sensors?. Time will need to be allowed before the signal from the wind sensor is used by the DP Control system. Selecting just one wind sensor will cause a differential alarm between the two sensors. The current mathematical model will not be correct. The wind sensor will read the same as before it was deselected.

DP vessels are particularly vulnerable to power shortages and blackout conditions. To guard against these events resulting in a vessel drift-off vessel with class 2 equipment must be fitted with: Separate engine room. Three: gyros and three MRU's. closed bus tie system. Power management system with preferential tripping.

A DP Class 2 cable layer vessel is in Track follow Mode with residual forces 45 degrees on the bow. There are no other obstructions in the area. The vessel has 6 thrusters, 3 supplied from BUS A and 3 supplied from BUS B. A consequence Analysis Alam indicates that a failure of either bus will leave the vessel with insufficient thrust to maintain heading/ position. Which of the following is the most appropriate action to take in this case?. Immediately cut and abandon the cable for future recovery. Continue operations without taking any further action. Change to a heading that will reduce thrust requirements and restore redundancy. Stop the vessel, wait for the alarm to go away, resume laying the cable.

Which is safer - to operate a DP vessel with open or closed bus the breaker, and why?. Only the main breaker open, all other the breakers closed. Closed, to save fuel by having tower generators running. Closed, to make it easier to restart thruster after the thruster stops. Open to stop any possibility of an electrical fault affecting all switchboards./ Open. Open bus tie prevent the effects of a fault in one switchboard from transferring to another switchboard.

Vessel in DP close to a platform with a heavy beam swell you have 2 DGNSS and a fanbeam system in use. Fanbeam signal strength is erratic and alternating strong. to weak resulting in frequent pop-outs from DP system. What could be the most likely cause of this?. Low battery level in fanbeam target. High Pop-out values. Sunspot activity. vessel's rolling motion exceeds the tilt parameters of the fanbeam Unit.

How should the vessel power management system be setup prior to entering the 500- meter zone?. Vessel should be set up as per the client instructions. It depends on the stance the vessel will be working from platform. PMS to be setup with main bus tre breaker open unless FMEA Says othewise./ According to the Activity Specific Operating Guidelines (ASOG), Task Appropriate Mode (TAM) or Critical Activity Mode (CAM), and FMEA findings, as applicable. Repaica PMS can be set up esther way depending upon the weather.

A vessel is conducting cable lay operations when the cable fouls a main propeller causing it to fail. What would be the most important action for the DPO to take?. Activate Emergency Stop. .

When two or more azimuth thrusters are fitted to a vessel, why may prohibited azimuth zones be programmed into the DP?. To prevent azimuth thrusters from interfering with each other. To prevent interfering with an echo sounder transducer. To prevent interference with a doppler log transducer. To prevent interference with taut wire.

A vessel is fitted with three tunnel thrusters at the bow as part of her DP Capability. The effectiveness of these units may be adversely affected by: Operating at a deep draught. Sand and mud in the water. The proximity of nearby platform structure. Rough seas causing heavy pitch.

What is a data timeout?. Fails to receive or send data within a specified time, preventing an operation from completing. ..

Which movement does the Gyro Compass monitor?. Yaw. Sway. Pitch. Surge.

The data taken into the mathematical model is dependent upon the form of the vessel above the waterline, i.e. the "sail area" and its disposition. Is this affected by? Or i.e. the "aerodynamic model" is this affected by?. The speed of the vessel move. Heave and Pitch. The direction of the vessel move. The wind direction and strength in relation to the ship´s head.

The wind sensors are being blocked by the topside of a platform. What should you not do?. Move to the windward side. Suspend operation. Remain in position and leave wind sensors selected. inform ETO.

What is the most frequent method of checking the MRU/VRS's are functioning correctly?. Check locally. Ensure electrical continuity to units is intact. Compare the feedback readings on the DP control system. Consult the most recent service report.

ROV and Dive Control stations must be informed when the following PRS are being reset: HPR. .

Among HPR system, the greatest accuracy can be expected in the following mode: Super short baseline. Long baseline method. Short baseline. Pinger Mod.

Select from the list below, the two PRS systems with longest usable range: GNSS or Artemis. radius. cyscan. hpr.

During critical activities in waters greater than 1000 metres, the following Reference Systems should be considered: HPR (HiPAP). .

The following system may be affected by 3 cm radar operating in the vicinity: GNSS. Artemis. HPR. Tautwire.

While using a Laser PRS, multiple targets may be placed around 360° while using the following PRS: Radius. Artemis. Cyscan. Radascan.

You should avoid using all references of the same type to prevent: Common failure mode. Loss position.

Select from the list below, the PRS systems with longest usable range: Fanbeam. Cyscan. HPR. Artemis.

In most DP systems, the Model will be unaffected by an unusual jump in the signal received from a PRS, as the data will be rejected by: Median Test. .

ROV and Dive Control stations must be informed when the following PRS are being reset: Artemis. HPR Beacon. Radascan. Fanbeam.

Hydro-acoustic Ranges can be affected by: Thunder. Night time operations. Heavy snowfall. Salinity.

Select from the list below, the PRS systems with longest usable range: Fanbeam. Radascan. Cyscan. GNSS.

The DARPS system is commonly used in the following type of Operations: Loading/Offloading of Shuttle Tankers. Tanker offtake. anchor handling opertions. air drive operations.

Taut wire System is useful in the following situation: 70 to 300 meter water depths. Water depths over 1000 meters. Shallow waters. Strong currents.

TDMA [Time Divisible Multiple Access] Radio technique is used with the following type of Position Reference System: A. FMCW Radar (Radius, Radascan). .

A system that can improve station-keeping accuracy in deep waters when coupled with (aided by) Hydro-acoustic systems is: DARPS. Dual GNSS. Deepwater Taut wire. lnertial navigation system.

An MSV is in the "Follow Target" Mode is following a Semi- Submersible in Position and Heading. Which is the best combination of PRS for the MSV?. DGNSS, Artemis, Radius. Radius, Fanbeam(with at least one Prism on the Semi Sub), Taut Wire. 2 DGNSS, ROV (with Transponder). 2 DGNSS, 1 Fanbeam (with at least two Prisms reflectors on the Semi Sub).

Can two taut wire systems on board be considered as 2 PRS?. Only if they are completely independent of each other. Only if they are on different sides of the vessel. Only if they are operated by different personnel. Only if their power supplies are different.

To set up a DP Vessel in the Auto Position Mode, the minimum sensors required are: At least one gyro and one PRS enabled. At least two gyro with no errors enabled. At least three three PRS with Median Test enabled.

You are the DPO on a DP Class 1 Vessel. The vessel's two Gyros have a steady difference of 3° compared to the third one. The best option would be: Discontinue the Operation and return to port. Reset the speed error. Apply the correction to the faulty Gyro and continue. Switch off one Gyro.

ls the capability plot affected by the number of generators that are on line?. NO - Capability plots are only to show what will happen after WCF. NO- Capability plots are made by ships officer. YES-There must be power available to run the thruster at maximum thrust. NO-Capability plot is based on the thruster output and not linked to generator.

What is 'spinning reserve'?. Thrust output from CPP that is not being used. The amount of power available from a generator that is online and not being used. The power available from the emergency generator. The power available if you started the offline generator.

What is preferential tripping (load sharing)?. When the power management system trips off a navigational equipment. When the power management system trips off the thruster using the most power. When the power management system trips off a thruster using bias mode. When the power management system trips off non-essential load such as cabin air conditioning.

How should you check if the vessel should be operated with tie breaker closed?. Always closed to save fuel. Find out how the last crew was operating vessel. Ask the Chief Engineer. Check the vessels FMEA/ASOG.

After a worst case failure should the engineers shut the tie breaker when next to a platform?. NO. .

On vessels with two switchboards, can you operate only with generators on one switchboard and tie breaker closed?. Yes, as long as the tie breaker is closed. No, You should have a generator on both switchboards. Yes, it will allow you to run all thrusters and stay working on DP. Yes, because it does not affect redundancy.

What is auto blackout recovery?. After a complete black out the power management system will try and restart all generators and all thrusters. When the emergency generator starts. When the engineer restart all generators. When the tie breaker is closed to stop the loss of all thrusters.

A function of the Power Management System is to continually monitor Available Power? 'Available Power' is: The number of generators running but not connected to the switchboard. The number of thrusters connected to the switchboard. The reserve(available) Power at any: given time. The availability of the Uninterruptible Power Supply.

Why does IMO MSC/Circ. 645 of 1994 Section 3.2 recommend that bus-tie breakers should be open during DP Class 3 operations (unless equivalent integrity of power operation can be accepted according to 3.1 )?. To prevent the effects of a fault in one switchboard from transferring to another switchboard. .

On a DP equipment class 2 vessel working within its Worse Case Failure Design Intent (WCFDI) the environmental conditions increase so that more than 60% of the available thruster force is being used to maintain position, what is likely to be the most appropriate alert level?. Yellow. .

With the wind and DP current factor of equal force and separated by 90° what would be the best heading for a mono hull DP vessel to counter balance the forces?. Best heading of the vessel is to keep vessel heading between two equal forces. .

What is full Diesel Electric Vessel?. Vessel with propellers that are direct drive. Vessel with only one bow thruster. All drives and thrusters are driven by hydraulics. All drivers and thrusters are electrically driven.

A vessel has completed her approach to a worksite which is close alongside a fixed platform. She is in her final working position. Before giving the "green light" allowing commencement of ROV operations, it is essential that. All checklists are completed 30 minutes on DP and a permit to work issued. The master has given his permission to work. Thruster Bias lockout zones established and programmed. The dive shack has launched the ROV.

When planning a DP operation for a location close to a fixed structure, one of the most important considerations is to: Check that all position reference systems are online. Take into account if you are "drift on" or "drift off'. Determine the schedule of platform communications. Ensure that Chief Engineer has begun maintenance.

When deploying an ROV directly over the side of a DP vessel, which of the following would be of most concern to the DPO?. Proximity of ROV and umbilical to running thrusters / DPO NEEDS TO ADVISE ON BEST HEADING TO REDUCE ROLLING. Proper lubrication of the lifting wire for the ROV. Proper operation of the HPR beacon on the vehicle. Batteries fully charged on ROV.

Which of the following should the DP Operator communicate to ROV Control?. Position of Taut Wire and other down-lines. Position of all Wind Sensors. Information about all PRS to be used, with a particular emphasis on above water PRS. Information about beacons and transponders.

A DP Capable vessel is engaged in ROV operations. The DP system is selected into 'Follow Sub' or 'Follow Target' mode. The operator is able to select a value known as 'Reaction radius' or 'Operational radius'. This value. Increases the accuracy with which the vessel follows the target. Ensures that when the ROV moves outside the radius the vessel will follow.. / Determines the distance the ROV can move before triggering a vessel move. Determines the speed with which the vessel follows the Rov. Allows the vessel greater freedom of movement.

Why is it important to check the center of rotation (COR) prior to using the DP system?. It is always safe to use the COR in alternate settings. The COR 1 s not really an important item to check. The COR determines the point the DP system will use in maneuvering the vessel. I should always set the COR to the BOW setting.

The DP operator must be familiar with the details of the worksite because: He needs to identify the hazards and use this in the contingency planning of the Operation. .

During the planning stage of a DP operation, it is essential that: The system be allowed 10 minutes settling time. All generators and thrusters must be online. At least three position reference systems be deployed. A full hazard identification and risk assessment be conducted./ Due regard to current, wind and weather forecast be included in the planning.

Before entering the 500m zone: DPOs to be well rested, vessel set up as per FMEA, and all checklists completed. All drills and the FRC be launched prior to entry. Make sure you set up on DP on the drift on (upwind/current) side of the installation. The vessel may enter and go alongside to 50 meters prior to using DP system.

The vessel should call the Platform IF: lf thrusters load exceed worst case limits. .

When approaching an installation's 500 meter zone you need to: Approach to 200 meter upwind with a minimum of thrusters enabled. Be upwind of the installation to make it easier to go alongside. Make sure there is only one DPO on the bridge and you are up current. If possible set up down current so if a failure occurs you will drift away./ Be downwind of the installation outside 500 meters.

Backup controls should be tested at the following times: Prior arrival on field (work location) /AT EVERY ARRIVAL OUTSIDE 500 METER ZONE DOWN CURRENT. WEEKLY. ANNUALLY. AS PER THE APPROVED ASOG.

When steaming to a new worksite what waypoint would you use?. Platform or superstructure should not be used as waypoint. WHATEVER WAYPOINT WHICH WILL SAVE THE MOST TIME. ALWAYS USE THE RIG AS A WAYPOINT AS IT MAKES THE ECDIS EASIER TO OPERATE. A WAYPOINT WHICH CAN NEVER BE INSIDE THE 500 METER ZONE OF THE RIG.

THE MAIN FUNCTION OF THE POWER MANAGEMENT SYSTEM IS TO. PREVENT BLACKOUTS. REDUCE FUEL CONSUMPTION. REDUCE ENGINE LOADS TO 50%.

DURING ROV OPERATIONS A BOW THRUSTER FEEDBACK SIGNAL INDICATES THAT #1 BOW TUNNEL THRUSTER HAS FAILED TO FULL FORCE. THE VESSEL IS NOT HOLDING HEADING. THE DPO SHOULD: ADVISE THE MASTER OF THE PROBLEM AND KEEP WORKING. BE PREPARED TO ACTIVATE THE EMERGENCY STOP FOR THE AFFECTED THRUSTER IF REQUIRED. INFORM THE ELECTRICIAN AND ASK TO HAVE THE PROBLEM FIXED.

GYRO 1 HEADING IS 020 DEGREES, GYRO 2 HEADING IS 031 DEGREES AND GYRO 3 HEADING IS 020 DEGREES. BY VOTING THE DP SYSTEM REJECTS GYRO 2. DP EQUIPMENT CLASS 2 OPERATIONS ARE IN PROGRESS, WHAT IS YOUR MOST APPROPIATE COURSE OF ACTION. DESELECT GYRO 1 AND SELECT GYRO 2. RESELECT GYRO 2. RESELECT GYRO 2.

WHY IS IT BAD PACTICE TO ATTACH A HPR BEACON TO A TAUTWIRE. THE BEACON MAY INTERFERE WITH THE TAUTWIRE ACOUSTIC SIGNALS. THIS COULD INTRODUCE A LARGE HDOP ERROR IN THE HPR SYSTEM. IF THE TAUTWIRE DRAGS BOTH SYSTEMS WILL MOVE TOGETHER CAUSING THE MORE STABLE SYSTEM TO BE REJECTED IN VOTING.

TO FIND OUT WHETHER AN IALA STATION IS AVAILABLE TO PROVIDE MF DIFFERENTIAL CORRECTIONS, A DPO WOULD REFER TO. REFERENCE VOLUMES OF GMDSS. REFERENCE VOLUME FOR COMMUNICATIONS. REFERENCE VOLUMES FOR RADIO AIDS TO NAVIGATION.

On a DP equipment class 2 vessel using 3 different position reference system and working in open water during a perior of calm conditions in thick fog. What might be the biggest DANGER?. Collision by another vessel/THRUSTER INACTIVITY CAUSING DESTABILIZATION. THERE IS A COMPUTER ERROR. INFORM THE ELECTRICIAN AND ASK TO HAVE THE PROBLEM FIXED.