The anchoring system is intended for safely mooring a vessel lying offshore in reasonable weather conditions. The system must be capable of keeping the vessel in position as per the holding power of anchor determined through the calculation of 'Equipment Number'. It is of paramount importance that the system is specified, designed, installed, operated and maintained in accordance with manufacturer's instructions, Class requirements and the owner's needs.The holding power of the anchor determined from its EN (Equipment Number) will not be sufficient to maintain the position of the ship in … [Read more...]
What is Chipping ? Tools, Precautions & Protection
Rust Scale removal by chipping, hammering, scaling and painting constitute the major portion of hull maintenance and requires labour and costs. It is important to do chipping properly not to allow rust again in the place where chipping was carried out once.It is better not to remove rust than chipping halfway through What is Chipping? The removal of weld spatter, rust, or old paint from ironwork using a hammer and cold chisel is called chipping. Chipping Tools Air Hammer Air Disc Sander Air Chisel (Jet needle chisel type) Chipping hammer Scraper Wire … [Read more...]
Cold Work
Cold Work is the work which cannot create a source of ignition or generate temperature conditions likely to be of sufficient intensity to cause ignition of combustible gases, vapours or liquids in or adjacent to the area involved. Cold work includes but not limited to:Opening vessels, pipes or enclosed spaces Where equipment requires decontamination Mechanical maintenance work Civil maintenance work Erection removal of scaffolding Insulation and painting Blanking/de-blanking. Disconnecting and connecting pipelines. Removing and fitting of valves, blanks, spades … [Read more...]
Guidelines on Working aloft or Overside on Ships
Definition Working aloft or Overside means a work being performed at a height and involving risk of falling, resulting in an injury. Guidelines As a general rule, personnel should not be permitted to work overside when the vessel is underway unless it is absolutely necessary and as determined by the Master.Personnel under training shall not be assigned aloft or over side related jobs. The power source to potential hazards such as ships whistle, radar, etc. should be isolated from their power source and accidental activation prevented by the use of warning signs and / or removal of … [Read more...]
How do you make out if the Anchor is dragging?
It can take some time to realise the Anchor is dragging, despite the ship drifting. A vigilant bridge watch is, therefore, essential.By watching the bearing of two fixed lights or objects in line. Beam bearings are the best. If they change, the ship is dragging. By dropping the deep sea lead on to the bottom, and noting if it trails ahead of the ship. By observing the anchor cable if she comes to long stay then short stay and then long stay repeatedly means she is dragging anchor. The ship’s side against the wind hasn’t changed. Checking to see there is no slacking of chains … [Read more...]
Anchor Terminology used in Shipping
Anchor ‘a’ cock bill: When the anchor is hanging vertically from the hawse pipe with the flukes turned into the ship’s side, it has been just clear of the hawse pipe and its weight is taken by the brake in readiness for letting go. In this position, it is not stowed correctly in the hawse pipe. Anchor coming home: When the anchor is being drawn towards the ship in the operation of heaving away, by means of the windlass, the anchor is said to be anchor coming home. Anchor aweigh: The anchor is said to be aweigh immediately it is clear of the bottom. Anchor dragging: The anchor is said … [Read more...]
Types of Knots, Bends and Hitches used at sea
Knots, bends and hitches 1. Overhand knot: It is used for temporary whipping and preventing the rope unreeving from the block and provides the foothold for the life line. 2. Figure of 8 knot: Provide foothold on the lifeline of the lifeboat davit and with the keel grab line and prevent the rope from unreeving patent log with the log line. 3. Reef knot: It is used to the reef point which is used for shortening the sail.it is also used to tie a bundle with the single rope. The reef knot is also used to join two ropes of equal size. 4. Sheep … [Read more...]
Surface Preparation Standards
The most widely-used surface preparation standards in use are the following:Swedish Standards (Sa, St), Steel Structures Painting Council (SSPC) standards and National Association of Corrosion Engineers (NACE) standards.Definitions for surface preparation Near-White Blast Cleaned Surface:A Near-White Blast Cleaned Surface finish is defined as a surface finish from which all oil, grease, dirt, mill scale, rust, corrosion products, oxides, paint or other foreign matter have been completely removed from the surface except for very light shadows, very slight streaks or slight … [Read more...]
Using Toggle Pin
HOW TO USE A TOGGLE PIN 1. Shackle the Toggle-pennant to the mooring bitts.2. Run the messenger ( with a small eye spliced in the end ) from winch to the mooring line to be released. 3. Take the messenger and make a turn around the mooring line.4. Pass a bight of the messenger through the eye.5. Pass the Toggle through this bight.6. Heave in on the Messenger rope. 7. Remove mooring lines from the bitts. 8. Slack the messenger line, the toggle will release itself and the messenger will be freed and the … [Read more...]