Deadweight Tonnage (DWT)

What is Deadweight Tonnage?

The word ‘ton’ in shipping can denote both weight and capacity. Loaded displacement tonnage is the actual weight of the ship and cargo. Light displacement tonnage is the actual weight of the ship. The difference between the loaded displacement and the light displacement is the weight that the ship can actually carry and is known as the Deadweight Tonnage (DWT).

Bale Capacity and Grain Capacity - what is the difference?

Ship bale and grain capacity measurements are provided by shipyards for dry cargo ships. Ship bale and grain capacities are used for measuring cargo space availability for bulk or non-bulk cargoes. 

Ship bale and grain capacity measurements show the actual volumes available for cargo in numbers. Grain capacity is the space that is available for liquid-type cargo, like bulk grain, which can flow into every corner. Bale capacity is the space that is available for bagged or baled cargoes. Generally, a ship’s bale capacity is about 7–10% less than grain capacity. 

Stowage Factor (SF) is the density of the cargo in the ship’s hold. In the shipping business, Stowage Factor (SF) is a very important piece of information. 

Due to the ship’s cubic capacity, a ship has only a limited volume (space) in her holds. In some cases:

• Light Cargo: the ship’s holds are full before all the ship’s deadweight cargo capacity is utilized 
• Heavy Cargo: full deadweight capacity can be reached with space still available in holds, but that space is unusable

In the shipping business, some historic measurement systems are still in use, for example, variations of the old English system (imperial system) of weights and measures are still frequently used for Stowage Factor (SF) – cubic feet to one ton (ft3/ton). 

Reversible Laytime

In voyage chartering, permitting charterers to add up the laytime allowed for loading and discharging is called Reversible Laytime. In other words, any time saved (or exceeded) at the load port can be carried forward to the discharge port. Depending on the drafting of the relevant clause, charterers may only have a limited period of time for deciding whether to reverse.

Dry Bulk Rate Recovery Short-Lived?

Shipping rates for vessels transporting commodities such as coal, iron ore and grains racked up impressive gains in the first quarter of 2016 after hitting record lows, but the rally could flatten out into the second half as the macroeconomic outlook remains uncertain, the latest forecasts show from IHS Inc.

It's Now Cheaper To 'Buy' A Dry Bulk Freight Vessel Than A Starbucks Coffee

Just 3 months ago China’s slowing growth has crushed shipping rates to such an extent that hiring a 1,100-foot merchant vessel would set you back less than the price of renting a Ferrari for a day.

Rates for Capesize-class ships plummeted 92 percent since August to $1,563 a day amid slowing growth in China. That’s less than a third of the daily rate of 3,950 pounds ($5,597) to rent a Ferrari F40, the price of which has also fallen slightly in the past few years, according to Nick Hardwick, founder of supercarexperiences.com.

Draft alterations depend on water density

Good day

It happened that I forgot the formula for the calculation of vessel's draft at different water density, though I searched the Internet and found nothing in English. So I decided to translate the article, which I found in Russian.

When the vessel passes from one water basin to another, the salinity (seawater density) changes.  It's very useful to know the way vessel's draft will change. And for the determination of vessel's draft delta we will turn to physics.

Types of bulk carriers

I would like to enlighten the basics, which will understand the whole picture. And another good book will help me out. It's named "Bulk carrier practice" by Captain J Isbester. It was written in 1990's, so the information might be outdated, but the basics are still the same:

Safe port and safe berth

Today I have faced with a question, which is simple on the one hand, but is rather difficult on the other hand. The question was "may the particular port and berth be considered as safe port and safe berth?"

THE New York Produce Exchange (NYPE) charter party (as revised in 1946) is a typical time charter. It imposes an obligation on the charterer to ensure that the vessel is employed "between safe port and/or ports". A similar duty is imposed in a voyage charter party. But, in many voyage charter parties, load and disports are identified by name, which gives rise to different considerations.

Stowage Factor of bulk cargoes

  Stowage factor (SF) indicates how many cubic metres (or cubic feet) of space one metric tonne of a particular type of cargo occupies in a hold of a cargo ship. It is calculated as the ratio of the stowage space required under normal conditions, including the stowage losses caused by the means of transportation and packaging, to the weight of the cargo. (Wikipedia)