How do you calculate under keel clearance?


How do you calculate under keel clearance?

UKC is equal to the minimum total water depth at the location of the ship minus the maximum dynamic draft of the ship.

What is the minimum under keel clearance?

Many ports use whichever is the greater of a defined figure or 10% of a vessel’s draught as the minimum under keel clearance.

What is the squat calculation formula?

Squat may be calculated by the following simplified formulae: Squat = (CB X V2 ) / 100 (In open waters) Squat = 2 X (CB X V2 ) / 100 (In confined waters)

What is the minimum under keel clearance allowed to pass over a pipeline?

How do you calculate your squat?

Squat may be calculated by the following simplified formulae:

  1. Squat = (CB X V2 ) / 100 (In open waters)
  2. Squat = 2 X (CB X V2 ) / 100 (In confined waters)

How do I calculate my squat?

What is CB in squat?

The value of the block coefficient CB determines if the maximum squat. occurs at bow or at stern. Full-form ships with CB greater than 0.700 produce. squat at bow. Fine-form ships with CB less than 0.700 produce squat at stern.

How do you calculate blockage factor?

Blockage Factor = ( proportion of a midship’s section of ship / cross sectional area of the channel, river or canal)

How is Catzoc calculated?

You should find the minimum depth in the vicinity of a planned track and apply correction to it.

  1. One of the components of the REQUIRED UKC is ZOC Allowance.
  2. ZOC Allowance (A1) = 0.5 + 0.01 × Depth.
  3. ZOC Allowance (A1) = 0.5 + 0.01 × 18.8 = 0.688 ≈ 0.7 m.

What is squat seamanship?

Squat is the reduction of a vessels Keel-Clearance, caused by the relative movement of the ship’s hull through the surrounding body of water. Compared with the neutral position (1) the hull sinks deeper into the water and at the same time will trim slightly.

What is squat block coefficient?

Block coefficient is the ratio of vessel’s underwater volume (Displacement) to the volume of a box that this could fit in.

How is Ukc calculated on a ship?

The Nett UKC is calculated as the available water depth for each part of the transit, minus the overall dynamic draft. In order to calculate the nett underkeel clearance of a ship in shallow water with waves present, the heave, pitch and roll of the ship are first calculated in given wave conditions.

What is squat calculation?

What is under keel clearance (UKC)?

Those intervals, known as operational windows, when they occur mooring and unberthing maneuvers are limited by several parameters relating to the environment and vessels, their calculation is summarized in the under keel clearance (UKC) indicator.

What is a minimum under keel clearance (AA)?

A minimum under keel clearance is one of the major factors required to provide safe passage for a vessel as it helps mariners avoid ship grounding, especially in challenging navigation conditions such as in narrow channels. But what does this technical term exactly refer to?

What is static Draft and gross under keel clearance?

1) Static draft: level between the sea level (referenced to the Datum of the nautical chart) and the lowest level of the ship’s keel. 2) Gross Under Keel Clearance: level between the ship’s keel and the bottom corresponding to the nominal depth of the channel (mapped depth).

What to do when under keel clearance is not sufficient?

If in doubt that sufficient under keel clearance cannot be maintained during any part of the voyage or when alongside, the master must: a. Inform the Ship Manager at the earliest opportunity; b. If alongside, vacate the berth if in any doubt about the risk of grounding.