DP > Multiple Choice Prep > Flashcards

Multiple Choice Prep Flashcards

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1
Q

What does LMRP stand for?

A

Lower Marine Riser Package.

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2
Q

What does HMI stand for?

A

Human Machinery Interface.

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3
Q

What is placed on an ROV when using hydroacousitcs?

A

A Responder.

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4
Q

What does DARPS stand for?

A

Differential Absolute Relative Position Sensor.

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5
Q

What does TMS stand for?

A

Tether Management System

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6
Q

What is placed on a diving bell when using hydroacousitcs?

A

Beacon/Pinger

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7
Q

What issue can arise when vessels engaged in DP operations are close to one another?

A

Thruster wash

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8
Q

Should ASOG be altered when a vessel is undergoing a different operation?

A

Yes as it should be activity specific.

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9
Q

What is the definition of ASOG under the IMO?

A

Guidelines on the operational, enviromental and equipment performance limits for the location and specific activity.

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10
Q

What is the definition of a Bus Tie Breaker under the IMO?

A

A device connecting/disconnecting switchboard sections.

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11
Q

What is the definition of a company under the IMO?

A

The owner of the ship or any other organisation, which assumes responsibility for operation of the vessel.

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12
Q

What is the definition of a Computer System under the IMO?

A

A system consisting of one or more computers and associated hardware, software and their interfaces.

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13
Q

What is the definition of Consequence Analysis under the IMO?

A

A software function continuously verifying that the vessel will remain in position even if the worst-case failure occurs.

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14
Q

What is the definition of a DP Control Station under the IMO?

A
  • A Workstation designated for DP operations.
  • Has necessary sources and information.
  • Controls with an independant joystick.
  • Manual thruster levers.
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15
Q

What is the definition of a DP Operation under the IMO?

A

Usign a DP system to control at least two degrees of freedom in the horizontal plane automatically.

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16
Q

What is the definition of DP Verification Acceptance Document (DPVAD) under the IMO?

A

The document issued by the admin or a recognised organization to a DP vessel.

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17
Q

What is the definition of a DP vessel under the IMO?

A

A unit/vessel which automatically maintians its position and/or heading by means of thruster force.

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18
Q

What does CAM stand for?

A

Critical Activity Mode

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19
Q

What does TAM stand for?

A

Task Approriate Mode

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20
Q

What does it mean when the ASOG DP status is green?

A

Normal Operations.

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21
Q

What does it mean when the ASOG DP status is blue?

A

The operational, envirmental, or equipmental perfomance limits are being approached.

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22
Q

What does it mean when the ASOG DP status is yellow?

A

Indicates a condition that may require a suspension of operations.

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23
Q

What would the worst case failure result in for a class 1 vessel?

A

Loss of position may occur in the event of a single fault.

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24
Q

What would a single failure result in for a class 2 vessel?

A
  • Loss of position is not to occur in the event of a single fault in any active component or system.
  • Static components (ventilation, seawater systems) protection from damage is demonstrated.
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25
How should the power train be set up for a class 2 vessel?
- Power system should be divisible into two or more systems. - Can be run as one but must have bus-tie breakers which automatically seperate upon failures.
26
How should the power train be set up for a class 3 vessel?
- Power system should be divisible into 2 or more systems with 2 generators either side. - The divided power systems should be seperated by an A60 bulkhead. - If the Generators are situatied below the waterline the compartment housing them must be water tight.
27
How many reference systems should class 2 and class 3 vessels have?
- At least 3. - When 2 or more are required they should not be of the same type, based in different principles, suitable for operating conditions.
28
WHat extra step is taken with PRS's on a class 3 vessel?
1 of the PRS' shoulkd be connected directly to the back-up control system and separated by A60 class bulkhead.
29
Which vessels require and FMEA?
Class 2 and class 3 vessels.
30
Can a class 2 vessel become a class one vessel?
No - class is determined by the recognised administartion in whichb the vessel needs to comply with.
31
What should class 2 and class 3 vessels have regarding power?
PMS - Planned Maintenance System. - Should have built in redundancy and a blackout prevention function.
32
What is the purpose of the PMS?
Prevent blackouts from occuring.
33
What is DARPS used for?
Shuttle tanker off take.
34
At what speed do thruster become ineffective?
3-4kts
35
What does CMF stand for?
Common Mode Failure
36
WHat are key sighns of Soliton occuring?
- (By day) Light and dark sripes in the water. - (By night) Stripes visible on 'X' band radar.
37
Why does the DP system tend to weight the likes of taut wires and hydroacoustics less?
Because they generate noise (more likely to plot more spread out).
38
What does a lower HDOP value mean?
THe lower the value, the stronger the signal.
39
How many UTMs are there globally?
60
40
How many Gyros does a class 2 vessel need?
3
41
How many MRUs does a class 2 vessel need?
3
42
How many VRUs does a class 2 vessel need?
3
43
How long should the UPS keep the systems powered for
- 30mins - For Class 2 and 3 vessels the UPS' should have different power origins.
44
Out of Cy -scan, Fambeam and Spot track which one can operate at 360 degrees.
Cy-scan
45
What is the Vertical and Horizontal range of Radius?
Vertical - 90 Degrees Horizontal - 90 Degrees
46
What is the Vertical and Horizontal range of Radascan?
Vertical - 22 Degrees Horizontal - 360 Degrees
47
What is the Lock on range of a prism?
2km
48
What is the Lock on range of a reflective tube?
150m
49
What does INS stand for?
Inertial Navigation System
50
What is INS usually paired with and why?
- GNSS, it checks one another - Stops the INS from drifting.
51
What are the three different accuracys of paid corrections?
- 0.1m - 0.2/0.3m - 1.0m
52
What are paid differential corrections sent to the vessel via?
- INMARSAT - Spotbeam
53
Can I check the elevation and azimuth of the correction Satellites prior to 500m entry?
-Yes - Via the DMOB
54
What gives free GNSS corrections?
- SBAS - EGNOS - WAAS - MSAS - GAGAN
55
What does Consequence Analysis work out?
It determines 'In the event of the worst case single failure, will the vessel maintain position'.
56
How is DP current genarated?
It is CALCULATED over time.
57
What signals can GNSS corrections be sent over?
- UHF - VHF - MF
58
What can be the problem of there are 3 PRS's selected but 2 of them are GNSS?
The GNSS' could have a Common Mode Failure (CMF) resulting in both being lost.
59
What is the Maximum length a dive unmbilical can be?
The length is defined by the distance to the most dangerous active thruster - 5meters.
60
Does the weather forecast influence DP operations?
Yes
61
Accoring to IMO circular.... which class of vessel should carry out DP operations with and Open bus tie setup?
Class 3
62
Should engineers close the bus tie after a worst case failure next to an oilplatform?
No
63
You are on a DP1 vessel and have 2 gyros which are reading a 3 degree difference in any direction, what are your actions?
Manually offset one of them via the DP so they are both reading the same so they can be used again for operation.
64
Which vessels require Consequence Analysis?
Class 2 and 3
65
When will Consequence Analysis notify if there has been a significant failure?
- After accessing Power, Thrusters and Eviroement every 60 seconds. - Once the system has deemed the vessel won't hgold position 3 consecutive times it will give a DRIFT OFF WARNING.
66
What does CAM define for class 2 and 3 vessels?
- The most robust, fault tolerant, configuration of the DP system, ensuring a single point of failure does not result in a situation exceeding the vessels identiified worst-case single failure. - Be excessive in redudnacy during high risk operations.
67
What is TAM in relation to with DP operations?
(Task Approriate Mode) - If the operation is low risk (clear of 500m zone) - Vessel can be configured to a lower level of redundancy. - To be contiually assessed.
68
What should you do if a thruster is not responding correctly and being irregular?
Emergency stop
69
What can you look at to see whether a thruster is operating properly?
Set points and feedback
70
What is the typical setup of an AirPod thruster?
- Fixed pitch - Variable RPM
71
What PRS systems have multi target capabilities?
Cyscan, Radius (FMCW), Fanbeam, hydro acoustics
72
Why doe we use false Eastings?
Because surveyors don’t like false numbers
73
Why are 3 gyros required on a class 2 vessel?
- Voting. - Redundancy.
74
Working at 1000m water depth. What would be the preferred PRS?
Hydro acoustic paired with an INS
75
Which has the longest PRS range?
Artemis (the oldest PRS)
76
How is an ROV responder activated.
The signal is sent down the wire/tether
77
What is Spinning Reserve?
The reserve load a generator has on it.
78
What is preferential tripping?
The PMS will trip out non essential systems to give power to essential systems.
79
What is the pro to having a closed bus tie on a class 2 vessel?
Distributes power easier and more evenly.
80
What do you NOT expect to cause the vessel to move from its point on a class 2 vessel?
Vessel failure/redundancy
81
What can have an effect on GNSS
Sunspots/ Ionospheric disturbance/ Solarflares
82
Conducting DP ops what would you prior to entering a 500m zone at a new platform
Risk Assessment
83
During DP ops the fog comes in, what would be your biggest concern?
Collision between another vessel
84
What is another word for follow target?
Follow sub
DP
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