Page 414 - statbility for masters and mates

402 Ship Stability for Masters and Mates
3. Sketch a half midship section through the weather deck of a cargo vessel, in the way of the hatch coaming. The vessel has combination framing. Name all parts. (30)
4. List the main hazards and state the precautions associated with the carriage of concentrates. (25)
5. List the safety precautions that should be observed when working cargo on a general cargo vessel using ship's gear. (30)
6. An oil tanker is required to thoroughly clean cargo tanks prior to drydocking. Describe how this procedure is carried out using portable tank washing equipment. State all necessary safety precautions. (25)
CLASS 4 DECK OFFICER
Operational Safety
212 hours. Attempt all questions. Marks for each question are shown in brackets.
1. A vessel displacing 4500 tonnes has a constant KM 6.2m and a present KG 5.8 m. The vessel loads 50 t of cargo on deck at Kg 8.5, and then moves 100 t of cargo from the `tween deck (Kg 5.5 m) to the lower hold (Kg 2.3 m), all weights being on the centre line.
Calculate the ®nal GM. (15)
2. (a) A vessel is ¯oating in water of R. D. 1.025
The initial drafts are: 4.10 m forward and 4.85 m aft. Cargo is then loaded as follows:
150 t at 80 m forward of the aft perpendicular. 70 t at 25 m forward of the aft perpendicular.
LBP 100 M; TPC 15; MCTC 40.
Centre of Flotation is 45 m forward of the aft perpendicular.
Calculate the ®nal draughts on completion of loading. (25) (b) Isthe®naltrimdesirable?Givebriefreasonsforyourconclusion.(5)
3. Outline the contents of the `Code of Safe Practice for Merchant Seamen' with respect to cargo winches, derricks, and hatches. (25)
4. (a) State what is meant by the term `Unitised Cargo'. (10) (b) Give three examples of unitised cargo. (10) (c) State the advantages and disadvantages of this method of cargo
handling. (10)
5. (a) Draw a plan view of a single ring main pipeline system on an oil tanker having 5 sets of 3 tanks. (13) (b) Show on your diagram how you would discharge three different products from No. 1 centre tank, No. 3 centre tank, and No. 4 centre tank, respectively. (12)
6. Describe the causes of static electricity in tanker operations, and explain how this can be reduced or prevented. (25)