The pressure vacuum breaker is fitted to a branch line off the inert gas deck main line. The purpose of the pressure vacuum breaker is to safeguard against over-pressurisation as well as under-pressurisation of the cargo tanks. The pressure vacuum breaker operates normally at a line pressure of 1800 mmWG and a vacuum of 700…
Chart Datum is the plane below which all depths are published on a navigational chart. It is also the plane to which all tidal heights are referred, so by adding the tidal height to the charted depth, the true depth of water is determined. By international agreement, Chart Datum is defined as a level so…
L.O.L.E.R is (Lifting Operations and Lifting Equipment Regulations) S.I. 1998 No. 2307 Lifting Operations and Lifting Equipment Regulations (LOLER) is a set of regulations in the United Kingdom that aim to ensure the safety of lifting equipment and the lifting operations that use it. The regulations apply to a wide range of equipment, including cranes,…
Fire Wallet is a wallet type arrangement (Box shaped, or Cylindrical enclosed container type) usually located near the Entrance of the accommodation of the Ship which contains various Important Plans, Crew list and other Important Information required for Immediate reference in case of Emergency. Contents of a Fire Wallet? Below mentioned are the basic Contents…
Stack weight is the maximum weight that can be borne by the deck, hatch covers or tank top at the corners of a bottom slot near the cell guide. The weight of a container is distributed over the four corner fittings and over the entire area occupied by the container. Where will you find stack…
Every person wishing to sail as a seafarer must have an MCA Medical certificate, which is provided by a DG Shipping-approved medical practitioner. Candidates must qualify for the eligibility test standards set up by the government of India. This blog will discuss the height and weight eligibility criteria required in the Merchant Navy. Is there any…
The foam monitors or turrets are permanently-installed foam discharge units capable of being aimed and projecting large quantities of foam substantial distances. They normally are mounted on a rotating base that allows the projection of foam in a 360-degree circle around the monitor platform. The angle of throw from the horizon can also be adjusted…
ntrinsically safe equipment is also used on ships to ensure safe operation in potentially hazardous environments. Some common examples of intrinsically safe equipment used on ships include: Intrinsically safe equipment on ships must comply with various safety regulations and standards, such as the International Maritime Organization’s (IMO) International Code for Fire Safety Systems (FSS Code),…
A Mate’s receipt (MR) is a receipt issued and signed by the chief mate of the ship for goods received on board. MR is nowadays replaced by a modern document called the Standard Shipping Note (SSN), but can still be seen in conventional trade like general cargo, dry bulk or tanker. The information in both…
The mast riser is normally used during loading for tank vapour pressure control. Its exit location, being at least 6 meters above the deck, allows for the free flow of the vapours displaced from the cargo tanks by the incoming liquid crude oil at the rate of loading of the cargo. The rate of displacement…
What are Lateral Marks and their usage in Region A and Region B Lateral marks are navigation aids used in waterways such as harbors, rivers, and channels to guide vessels in staying within the navigable channel and avoiding hazards. These marks indicate the edges of the navigable channel and help mariners determine the direction of…
Differential Global Positioning System (DGPS) is an enhancement to Global Positioning System that uses a network of fixed, ground-based reference stations to broadcast the difference between the positions indicated by the satellite systems and the known fixed positions. These stations broadcast the difference between the measured satellite pseudo ranges and actual (internally computed) pseudo ranges,…