How Do You Calculate Hog And Sag?

How is trim correction calculated?

3.17 To calculate the First Trim Correction, multiply TRIM by TPC, then multiply the product by the longitudinal Centre of Flotation (LCF) x 100. Then, divide the final product by the Length Between Perpendiculars (LBP). Second Correction = TxT x +/-50 cm x MTC diff.

How do you calculate aft draft?

– Aft Draft Corrected (Acd) = Am + Ac = 11.175 + 0.021 = 11.196 M. – True Trim (TT) = Acm – Fcm = 11.196 – 10.796 = 0.400 M. – Fore and Aft Mean (FAm) = (Fcd + Acd) / 2 = (10.796 + 11.196) / 2 = 21.992 /2 = 10.996 M. – Mean of Mean Draft (MM) = (Mcd + FAm / 2) = (10.965 + 10.996) /2 = 21.961 / 2 = 10.9805 M.

What is sagging condition?

The condition of a vessel caused by the unequal distribution of cargo. When a vessel loads too heavily in the center it causes a bending downward of the hull at the midships area. This can also be caused by the vessel working in heavy seas with large waves under each end and no support under the center of the ship.

What is the difference between hogging and sagging?

Hogging is the stress a ship’s hull or keel experiences that causes the center or the keel to bend upward. Sagging is the stress a ship’s hull or keel is placed under when a wave is the same length as the ship and the ship is in the trough of two waves.

What is 2nd trim correction?

2nd Trim correction takes care of this change of position of LCF because of trim of the vessel. The formula for 2nd trim correction is. To get the value of Dm-Dz, get the value of MCTC for (mean draft +50 cms) and for (mean draft-50 cms). The difference between these two values of MCTC will be the value for Dm-Dz.

What is the difference of forward and aft draft?

The difference between the drafts forward and aft is called trim. When the draft forward is greater than the draft aft, the ship is said to be trimmed by the head. When the draft aft is greater than the draft forward, the ship is said to be trimmed by the stern.

What is aft draft?

The draft aft (stern) is measured at the perpendicular of the stern. The draft forward (bow) is measured at the perpendicular of the bow.

What is firm sagging?

adjective. If you describe something as saggy, you mean that it has become less firm over a period of time and become unattractive.

What is pounding in ship?

Pounding: When a ship sails in heavy seas, it pitches. It can happen that the bow rises over the crest of a wave and emerges completely out of the water. When the bow comes back down on the water, it can be subjected to a major impact, which is pounding.

What is hogging and sagging bending moment?

The bending moment which causes a beam to bend with the concave side upwards, is called a Sagging Bending Moment.On the other hand, the bending moment which causes a beam to bend with the concave side upwards is called a Hogging Bending Moment. This kind of a bending moment is treated as a negative bending moment.

Is hogging positive or negative?

Hogging is positive or negative:- Hogging is negative bending moment,and band in convex face structure in upward direction.

What do u mean by hogging?

Hogging is defined as taking or keeping too much for yourself and not sharing. When you steal all of the blankets on your bed and leave your spouse with nothing, this is an example of a time when you are hogging the blankets. verb.

What is hogging in turbine?

1) Hogging is when the turbine is shut down faster than normal or under trip conditions and the natural cooling of the rotor is not allowed to happen, usually happens when the barring system fails to start, the rotor bends in an upward motion in the middle and makes contact with the stator or casing thus allowing

How is BMD calculated?

It is calculated as the perpendicular force multiplied by the distance from the point. A Bending Moment is simply the bend that occurs in a beam due to a moment.

How do you find the position and magnitude of the maximum bending moment?

Basically bending moment diagram is the integral of shear force diagram. Hence, area under the shear force diagram is the bending moment. For simply supported beam, maximum moment can be found by finding the area of shear force diagram from one end to the point where shear becomes zero.

What is a flexural formula?

This beam section AB is said to be in the condition of simple bending or pure bending. The flexural formula is given by the relation: M/I = E/R = /y.

How is spinning draft calculated?

Draft = 12.597. Draft in front zone = 6.69.
M/C specifications:

1. RPM of the motor =1440.
2. Dia of the motor pulley = 5”
3. Dia of the tin cylinder pulley = 10.5”
4. Dia of the tin cylinder = 10”
5. Dia of the wharve = 1.125”
6. No of teeth of fibre wheel = 42T.
7. No of teeth of front roller driving wheel = 98T.
8. Dia of the front roller = 1”

How is draft calculated on a boat?

Divide the total volume of water displaced by the surface area of the boat’s deck. In the example you would divide 5.47 by 120 (the surface area of the deck) and get 0.046 feet. Add together the result from Step 1 and the result from Step 7 to obtain your boat’s draft. In the example, you would add 3 to 0.046.

What are two types of trimming calculations?

There are basically only two types of trimming calculations.
Some important characteristics of this picture are:

• B is the Buoyancy Force provided by the vessel with level trim.
• W is the total weight applied to the vessel.
• L is the length between the forward and after draft marks.

How do you calculate barge stability?

The size of GZ is the measure of how stable or unstable the vessel is at any particular angle of heel. For small angles of heel (less than 15°), the ‘righting’ or ‘overturning lever’ GZ = GM x sine (where is the angle of heel, in degrees).