Questions out of exam of 23th

Question 1

You are on dive control and there is a first aid kit available. The dates is about to expire. Who is responsible for the first aid kits and DMAC15 on the vessel?

Answer 1

Diving superintendent or vessels medic.

Note: There should be an appropriate system for the control and maintenance of this Medical Kit and responsibility for this Kit should be vested in the Diving Superintendent or vessel Medic

DMAC 15

Question 2

In case of stricken bell in the seabed. As a supervisor what advise you give to your divers about the equipment they should throw away?

Answer 2

Helmets, bailout, unnecessary gear, tools… to make more space
Keep umbilical to seat on provide isolation Adequate between the hull and yourself.

Video lost bell survival

Question 3

Compressors according to BS EN 12021 should be checked every??

Answer 3

3 months or 6 months

Note: State in D022

Question 4

During the diving operations, the load in the crane is in the water. Who is the responsability is the operation?

Answer 4

Diving Supervisor

Question 5

Manage of change needs the approval of whom?

Answer 5

The contractor’s management of change procedure needs to describe clearly the process to be followed, including the requirement for offshore and onshore reviews and risk assessments and who needs to give approval offshore and onshore both from the contractor and the client, for any revision or change.

If the criticality or importance of the change is high enough, then the change request may need to be sent ashore to more senior management for approval, rather being approved by the offshore management team.

Question 6

Material that IMCA endorses for O2?

Answer 6

Tungum

Question 7

Why concrete matresses should have long slings?

Answer 7

During installation, the use of long webbing slings allows the load to be landed and detached from the rigging, whilst still maintaining the installation frame high enough above the divers/ROVs during periods of vessel motion to avoid physical contact with them or the pipeline.

D042

Question 8

Internal cylinders of HRU are tested how often?

Answer 8

External visual examination: 6 months

Thorough external visual examination and gas leak test to MWP. If the competent person deems it necessary, a hydraulic overpressure test may be required Note: Particular care should be taken in inspecting the areas under clamps or where the cylinder rests on a support: 2.5 years

Thorough internal visual examination plus hydraulic overpressure test to 1.5 times MWP plus the 2.5 yearly tests above: 5 years

Question 9

If the diver is delayed for surface O2 treatment? what do you do?

Answer 9

Decompress on teatment table

Question 10

The apraisal of a diver should be signed by whom before go back to the office??

Answer 10

Diving supervisor

Question 11

Who should be waiting at the site of decomppression facility on HRU arrival?

Answer 11

12 people

diving technician supervisor; 1

diving mechanical technician; 1

diving electrical technician; 1

LSS x 2;

LST x 2;

superintendent/designated senior company representative; 1

ALST/tender equivalents to support the life support team; 1

crane operator, rigger and banksman. 3

Question 12

LST found a leak in the medical lock, who should contact, what he should do ?

Answer 12

When the external door has been closed, the tender must stand by until the lock has been safely pressurised. He must immediately inform the divers and the control room if there is a leak.

D022

Question 13

Where gasbag alarms are situated?

Answer 13

Monitoring In addition to the stop/start controls for compressor operation, a suitable means of monitoring the gas bag to avoid over inflation must be fitted. This may be an audible and visible over inflation alarm fitted to the gas bag.

Such an alarm must operate in the gas bag area, at the compressor location and in chamber control. If it is possible to exhaust the diving bell contents to the gas bag, then such an alarm must also be fitted in dive control

Question 14

Legally responsable to number of divers and safety

Answer 14

diving contractor?????

Question 15

Diver with no pain but sign of ear infection initially. should be given???

Answer 15

If a diver suffers an ear infection, he should be given treatment ear drops and, if necessary, a suitable pain killer. Preventative drops must be discontinued. He requires one labelled bottle of drops for each ear, even if he has symptoms in only one ear. He should also take ear swabs to allow the infection to be identified.

Question 16

Divers transferring from the bell to tup what do you do as supervisor?

Answer 16

Watch gauges

During the actual transfer the chamber system should be safeguarded by having a diver in the transfer lock controlling the trunking door and by ensuring that all doors to the transfer lock remain closed.

Question 17

1 atm is

Answer 17

14.7 psi

Question 18

lifting bags, te holdback line is attached to? and inverter line is attached to?

Answer 18

The inverter line should be attached between the dedicated attachment point at the top of the lift bag and the load.

Hold-back rigging shall be attached between the load and a DMA or to a suitable fixed point.

Question 19

Divers on the way up loose control because a contamination in the bell. What do you do?

Answer 19

If the divers are working from a diving bell, there is a risk that contaminants which give off vapours may be introduced into the diving bell when the divers return to it after their dive. Suitable precautions (such as removing contaminated oversuits before entering the bell) should be considered during the risk assessment in order to minimise this risk.

If contamination of the bell atmosphere is even suspected, all occupants should breathe from BIBS until such time as the situation has been corrected.

Question 20

Follow the BS EN 12021. The maximum allowed water in cylinder compressed at 185bar is??

Answer 20

CO: 5 PPM
CO2: 500 PPM
OIL: 0.5 mg/
WATER: at the outlet compressor: 25mg
WATER: at cylinder outlet, pressure 40 - 200 bar: 50mg
WATER: at cylinder outlet pressure 200 - above: 35mg

Question 21

Bell volume 5t, weight 6t. Supossed to be 200kg negative buoyancy

uplift 675
weight 675
up 1075

Answer 21

uplift of 675 ???

Question 22

concepts of a bailout with twin tanks

twin bailout with 10 litres how much gas is available.

Answer 22

???

Question 23

When tranfering a injured from the living chamber to the HRU. What you should take in considerantion?

Answer 23

the location of the saturation system surface compression chambers;

the method of transferring the divers under pressure to the HRU;

the length of trunking required to achieve the transfer;

the diameter and route of the trunking;

the time taken to achieve transfer of the divers under pressure;

the ease of transferring any injured diver through the trunking in an emergency situation;

any need for sampling and analysis of atmosphere in this trunking;

the length of time needed to vent the trunking.

Question 24

In case of using a strecher to move a injured diver to the HRU using a lifting pulley system, what you should take in consideration?

Answer 24

The pulley must be of a length that allows connection at the furthest extremity of the trunk

Note: A suitable means should be fitted to assist an unconscious diver in to the HRU. If this is by a pulley system, then the length must be sufficient for the length of trunking involved.

Both statements out of D024