Captain Chris

10/06/2024

Loading Rails and Sleepers.

09/06/2024

14/03/2024

My 1st DD as Master…

16/07/2023

For the mates….

Learn about the list of important ship surveys and inspections which deck officers must know in order to ensure vessel's safety and seaworthiness.

05/07/2023

Thank you TasPorts for posting my video.😀

05/07/2023

2021…

27/06/2023

GMDSS Radio Survey

28/05/2023

RADAR

The radar is one of the most used equipment systems onboard ships. It is designed for detecting and tracking targets a considerable distance. Let's take a look at 15 things that need to be considered…

10/05/2023

Thanks Ms. Kara. Salute!

Kara David feels secure in her long-distance relationship with husband, LM Cancio, who works as a seaman.

In the anniversary special of , the veteran broadcast journalist said her husband is an exception to the impression of seafarers as "sea-manloloko."

Search for "Updated With Nelson Canlas" on Spotify, Apple Podcasts, Google Podcasts and other streaming platforms to listen for free!

LISTEN FOR FREE HERE 🔊

Spotify: https://spoti.fi/3nLO7CG
Apple Podcasts: https://apple.co/41mBzQa
Google Podcasts: https://bit.ly/42FxW8X

27/04/2023

What is the difference between listing and heeling?

Check out our post to find out!

What is the maximum angle of list/heel you have faced on your ship?

Comment below!

Download our ebook of the week "HOW TO BECOME A SUCCESSFUL DECK OFFICER" at a limited time offer!

Download NOW! Link in comment

17/04/2023

GZ_Curve

. What is a ?

GZ Curve is a curve indicating the transverse distance between the centre of gravity (G) and centre of buoyancy (B) in a condition when the vessel is heeled to a certain angle.
The shipyard provides the information to calculate GZ for various angles of heel and for various displacements.
Ship’s trim generally is zero for making the hydrostatic tables.
All particulars are for static sea conditions. This is the reason the curve is also called the curve of statical stability.

. What is the purpose of providing GZ curve information on a ship?

The purpose of GZ curve information is:

To demonstrate the compliance to intact stability criteria in any service condition.
To demonstrate the compliance to damage stability criteria in a condition of hull breach.
To find the effect of; transverse, vertical shift of a weight; effect of free surface; effect of grounding on GZ curve.

. What is the significance of area under GZ curve?

The area under GZ curve is a measure of the dynamic stability of a ship.
Dynamic Stability at an angle can be understood as the energy required or work done by an external agency to heel the ship to that angle.
Mathematically, this is equal to the product of displacement of the vessel and area under the curve in meter – radians.

The area under the curve is normally found by Simpson’s rules. GZ curve indicates the stability potential and thus the capability of the ship to resist heeling in rough sea conditions.

. What information is available from a GZ curve?

The following information is available from a GZ curve:

The initial GM: The slope of GZ curve at the origin is indicative of ‘Initial stability’ (GM0).

Maximum righting arm: Is the maximum vertical distance or separation of the GZ curve from the baseline.

The maximum righting moment: Can be found by multiplying the maximum GZ with displacement.

The angles of Equilibrium: The heel angles at which the GZ curve touches the x-axis or the base line are the angles at which the ship can be at equilibrium.

The range of positive stability: Is the range in degrees between the upright equilibrium angle and angle of vanishing stability.

Angle of deck edge immersion: The point at which the concavity changes to convexity is called point of contra flexure. This occurs approx. at the deck edge immersion.

Angle of maximum list that the vessel can sustain: Is based on the principle that if the listing moment caused is more than the maximum righting moment the ship will capsize.

Angle of dangerous list: Some say that the angle half the maximum permitted list angle is the limiting danger angle of list.

Angle of loll for the condition of negative upright GM0: The GZ curve loops in negative direction and then again rises upwards intersecting x-axis at angle of loll.

The angle of list due to G being off centre: This is found by the intersection of cosine curve (GG1 cos θ) with original GZ curve.

Dynamic stability: Dynamic stability at any angle of heel is found by multiplying the area under the curve till that angle by the displacement of the vessel.

https://www.facebook.com/capt.haytham.nouni 👌

04/04/2023

⚓️

03/04/2023

Departing Adelaide…

22/03/2023

Can you name all the mooring lines in this picture? Test your knowledge and see how many you can identify!

Have you ever been involved in a mooring operation on a ship? What was your role and experience like? Share with us in the comments!

Don't forget to check out our book of the week "Deck Operations and Machinery" at the best price ever. Download now to learn more about safe and efficient mooring operations in the maritime industry! - Link in comment

30/08/2022

412 signatures are still needed! - Management & Operational Level Courses benefit training centers not PH seafarers

19/08/2022

We are inviting top and outstanding maritime cadets to join our growing fleet (with or without shipboard experience)! GO TO: bit.ly/AllAboardCadets.

---

Döhle Seafront Crewing (Manila), Inc. is a licensed manning agency
providing excellent and qualified crew to various shipowners and managers with German Precision and Filipino heart.

POEA LICENSE NO.: POEA-018-SB-021717-R-MLC
ISO 9001: 2015, MLC 2006 Compliant

NO FEES to be collected. Beware of illegal recruiters.


📷: Norman Mendoza