2.2. AUTOESTIMA
2.2.2. Niveles de autoestima
By pressurising the tank and transferring it to another empty tank.
LNG1032-460 :
A :
If both main cargo pumps fail in a fully loaded tank on a Moss type vessel how would the cargo be discharged? Wrong or Missed Data? Click
By fitting an emergency cargo pump into the tank.
LNG1032-461 :
A :
If both main cargo pumps fail in a fully loaded tank on a Membrane type vessel how would the cargo be discharged? Wrong or Missed Data? Click
By vaporising LNG in the vaporiser and supplying it to the top of the tank.
LNG1032-462 :
A :
How is the pressure created to enable the cargo to be transferred from one tank to another if both main cargo pumps in the tank have failed?
Wrong or Missed Data? Click
The pump sits in column in the tank and the pump discharges into the column which is fitted with a valve on the top connected to the liquid line.
LNG1032-463 :
A :
When an emergency pump is fitted into a tank how does it discharge into the liquid line? Wrong or Missed Data? Click
When the secondary barrier is +5°C
LNG1032-464 :
A :
On a membrane vessel when is warming up deemed to be complete? Wrong or Missed Data? Click
When the equator is above -20°C and tank wall approximately +5°C.
LNG1032-465 :
A :
On a Moss vessel when is warming up deemed to be complete? Wrong or Missed Data? Click
Less than 3% by volume
LNG1032-466 :
A :
How low does the concentration of methane have to be in all spaces and equipment before inerting is deemed to be complete? Wrong or Missed Data? Click
Level must be above 80% tank height or below a level equal to 10% of the tank length.
LNG1032-467 :
A :
What are the normal tank filling levels for a modern membrane type vessel so that it can proceed to sea without the risk of suffering severe sloshing damage?
Wrong or Missed Data? Click
Gas detection alarm in primary barrier space (PBS). Rise in pressure in affected PBS. Fall in temperature in bottom sensors in the secondary barrier space (SBS).
LNG1032-468 :
A :
What are the indications of a leak in the primary membrane? Wrong or Missed Data? Click
Videotel CBT LNG Vers 1.0.32 (QUESTIONS & CORRECT ANSWERS)
5.Non-standard and Emergency Operations (Module 5) - test for Electrician
Yes, it is a problem. A small amount of water in the secondary barrier can form ice and a thermal bridge to the inner hull resulting in a cold spot.
LNG1032-469 :
A :
In case of leakage into insulation spaces, is it a problem to have a small amount of water in the secondary barrier? Why? Wrong or Missed Data? Click
Bilge wells are fitted with water detection sensors and pumping out facilities at the bottom, after end of each secondary insulation space or hold space (Moss ships).
LNG1032-470 :
A :
How to detect and eliminate water in the secondary insulation space or hold space (Moss ships)? Wrong or Missed Data? Click
Large quantities of water leaking into the insulation space of a membrane vessel could severely damage the tank membranes and insulation boxes.
LNG1032-471 :
A :
What could happen in case of serious water leakage into the insulation space of a membrane vessel? Wrong or Missed Data? Click
When the primary insulation space is 3kPa lower than the secondary.
LNG1032-472 :
A :
At what differential pressure of primary and secondary barriers is it recommended that they are inter-connected to equalise the pressures?
Wrong or Missed Data? Click
- Cargo tank insulation spaces. - Gas burning operations. - Gas compressors. - Vent mast fire extinguishing system. The dry powder fire extinguishing stations on deck are not affected.
LNG1032-473 :
A :
If the nitrogen generating system failed on board an LNG carrier and no nitrogen was available, can you state 4 systems that would be affected? Are the dry powder fire extinguishing stations on deck affected?
Wrong or Missed Data? Click
There are four alarm stages for high level to help to prevent overflowing of tanks, usually: - 95% high alarm - 98% high high alarm - 98.5% alarm and tank filling valve close - 99% very high level alarm and ESD.
LNG1032-474 :
A :
What are the cargo tanks' high level alarm stages? Wrong or Missed Data? Click
If any equipment control system in the IAS fails, then it is possible to switch to manual local control and continue operations.
LNG1032-475 :
A :
The IAS system (Integrated Automation System) is a distributed processing system. The control functions are defined locally in the process stations and not in the operator stations. Why is it important in case of failure?
Wrong or Missed Data? Click
In the event of an LNG liquid leak during cargo operations the first priority is to protect the adjacent steel work by spraying with water either from a fire hose or using the IMO spray pump.
LNG1032-476 :
A :
What would be your first priority in the event of an LNG liquid leak during cargo operations? Wrong or Missed Data? Click
6.6kV: - Main cargo pumps. - HD compressors. 440V: - LD compressors - spray pumps - stripping pumps - compressor house/motor room fans
LNG1032-488 :
A :
Can you give 2 equipments that will be driven by 6.6kV motors on a modern LNG vessel? And 2 equipments that will be driven by the low voltage 440V supply system?
5.Non-standard and Emergency Operations (Module 5) - test for Electrician
- Electric motor room supply fans. - Cargo compressor room exhaust fans. - Glycol circulating pumps.
LNG1032-489 :
A :
Your vessel suffers a blackout while discharging cargo. Can you state 3 pieces of equipment that will restart automatically when power is restored?
Wrong or Missed Data? Click
First loading after refit.
LNG1032-500 :
A :
How often are the cargo tank independent high (98.5%) and high high (99% ESD) alarms normally tested by actually transferring cargo to activate them?