Article

Updated App: "Bollard Pull Calculation for Marine Pilots"


by Baykal YAYLALI - published on 17 June 2024 2445 -

Quick Links:
Download full document as PDF (1,7 MB)
Download full document as PDF (1,7 MB)
Download full document as PDF (1,7 MB)
Download full document as PDF (1,7 MB)
Foreword by Captain M. Baykal Yaylali:

"As you remembered,
I made a bollard pull calculation application for smart phones about 4 years ago with under consultancy of Capt. Henk HENSEN as named BPC.
We made updated and developed new version of app.
Program is served free for global maritime industry as before.
I would like to share it and informed my colleques.
You may follow a few parts of an article as below;

Required tug power and number of tugs needed in variable conditions of wind and current isin most cases an assessment made by pilots based on their professional experience. However, assessments will raise questions by lawyers if something goes wrong. They will use tools to calculate what really is needed with respect to tug power and number of tugs. They have furthermore the advantage of time.

A pilot has not so much time. For a pilot, if tugs are needed, it is hard to calculate the required tug power just before or during ship manoeuvring. Furthermore, the more extreme the weather conditions become the less accurate assessments are and the higher the risk of too little tug power.

A handy and simple tool to determine in a minimum time what is really needed as tug assistance, is the Bollard Pull Calculator which calculates in an approximate way the total required tug power for ships in various conditions of wind and current. This tool can be loaded as an app on the smart phone.

The tool is based on the calculations and graphs as explained in chapter 5 of the book “Tug Use In Port”, written by Captain Henk Hensen FNI; first published in 1997 by The Nautical Institute, London, UK, with a 3rd edition published by The ABR Company, UK, in 2018). Moreover, formulas of linear and non-linearregressions obtained from academic and scientific studies have been digitalized and made suitable for mobile application. (BS 6349-1, OCIMF Mooring Equipment Guidelines (MEG4) 4th Edition 2018, SIGTO’s Prediction of Wind Loads on Large Liquefied Gas Carriers (2007), Post-Panamax Full Loaded Cond. Jare, Andersen I.M.V. (2003), Parameter identification of wind loads on ships, Werner BLENDERMANN [1993])

The program has been tested for more than 5 years and it has been observed that it works in a satisfactorily way."


Teaser pictures:
Teaser pictures
Teaser pictures
Teaser pictures
Teaser pictures
1.0 Introduction

Pilots rely on their extensive professional expertise and the prevailing ship conditions to determine the requisite additional tugboat power and quantity amidst varying weather dynamics. Despite their expertise, pilots face time constraints that hinder accurate real-time decision-making. Compounded by adverse weather, the scope for error amplifies during assessments, risking reduced tugboat efficacy in challenging operational environments. While legally designated as advisors, pilots bear full accountability for precise calculations and subsequent decisions devoid of time constraints or operational pressures. In the event of mishaps, judicial entities and legal representatives promptly scrutinize the situation with proper tools and adequate time allocation to ascertain the authentic tug power and tugboat quantity requisites.

The "Bollard Pull Calculator" stands as a valuable and user-friendly tool for estimating the total tug power essential for navigating ships through diverse wind and current scenarios swiftly, aiming to streamline the determination of optimal tug power and quantity efficiently. Developed based on methodologies outlined in Capt. Henk HENSEN's "TUG USE IN PORT" Chapter 5, seminal works such as BS 6349-1, OCIMF Mooring Equipment Guidelines (MEG4) 4th Edition 2018, SIGTO’s Prediction of Wind Loads on Large Liquefied Gas Carriers (2007), Post-Panamax Full Loaded Cond. Jare, Andersen I.M.V. (2003), Parameter identification of wind loads on ships, Werner BLENDERMANN (1993) and other significant references, this program digitizes and adapts linear and non-linear regression formulas derived from scholarly research for mobile application deployment. Insightful elucidations on calculations are accessible via the program's "ⓘ" symbol, guiding users through intricacies. Further program elucidations are intricately detailed in subsequent sections for comprehensive understanding.

2.0 The Various Sections
A. BPC SECTION
Fig. 1 BPC Section
Fig. 1 BPC Section
Fig. 1 BPC Section
Fig. 1 BPC Section
i. Calculations for required tug power in case of winds
In this section, first the ship type is selected and other data entries are made. Ship types are classified as shown in (Figure 1). Among the values to be entered afterwards, the data entries determined as “Longitudinal Height” and “Frontal Height” are very critical as they are based on user calculation and observation. (Figure 2)

. . .
Download full document as PDF (1,7 MB)
Download full document as PDF (1,7 MB)
Download full document as PDF (1,7 MB)
Download full document as PDF (1,7 MB)
BY
Author: Baykal YAYLALI
active marine pilot - Directorate General of Coastal Safety
What's your opinion on this?
Login or register to write comments and join the discussion!
Read more...

Article New app: Pilot´s Tug Assist Tool PTAT - Bollard Pull Calculation for Marine Pilots

by Capt. M. Baykal Yaylai - published on 19 February 2020

Required tug power and number of tugs needed in variable conditions of wind, current and waves isin most cases an assessment made by pilots based on their professional experience. However, assessments will raise questions by lawyers if something goes wrong. They will use tools to calculate what really is needed with respect to tug power and number of tugs. They have furthermore the advantage of time.

2

Video Safety of Navigation vs. Commercial Pressure

published on 18 January 2021

Safety of Navigation vs. Commercial Pressure / ROMEILs Tv Commercial Pressures impacts the safety of the vessel, study says Seafarers are pressured to keep quiet and keep the ship moving by ship operators, who dont want to lose inccome. Ship's officers who bring safety issues to the attention of management are exposed to the risk of retaliation. As whistle-blowers they may face punishment, demotion or even termination. International Organization of Masters, Mates & Pilots (MM&P) has...

1

Video Prince Rupert Ship Spotting. Drone video.

published on 2 July 2021

The Container Ship RDO Conception arriving in Prince Rupert after a 10 day voyage from Tokyo. Once in our harbor, she was eased into the container terminal with a little help from SAAM tug boats Orleans and Venta. Filmed using a DJI Mini 2 If you are interested in purchasing a Mini here is a link to my DJI affiliate program. https://click.dji.com/AFpMBjgnYfRjCViNU2HZ_g?pm=link All video footage is owned by Nortcoast Drone and it can be licensed as stock footage. We are certified in...

0

Article CMPA Launches the National Centre of Expertise on Maritime Pilotage

published on 8 June 2021

The technical body will bring together the extensive technical expertise and professional knowledge of Canada's licensed maritime pilots.

0

Article Harbor pilots have one of the highest paid — but simultaneously riskiest — job

published on 17 April 2023

The average harbor pilot at the Port of Los Angeles makes $434,000 a year, but also faces a one in 20 chance of dying on the job, according to a book from The Wall Street Journal's Christopher Mims that was published in 2021.

1

Video Norway’s $325 Million Ship Tunnel Gets Go Ahead

published on 25 March 2021

Construction of the world’s first shipping tunnel will soon get underway in western Norway following government approval of startup funds. The Norwegian Coastal Administration (Kystverket) has proposed a plan to complete a tender process in 2021.

0

Video Maritime Pilot - Mansoon in river Humber EP 10

by Dr. Captain Ahmed Sati - published on 18 December 2024

Episode 10 by Ahmed Sati

0

Article NHV Group Wins Contract Extension With Dutch Maritime Pilots’ Association

published on 18 March 2024

Helicopter services company NHV Group has won a contract extension with the Dutch Maritime Pilot’s Association (Nederlandse loodsencorporatie) to support maritime pilotage services in the Netherlands.

0

Video Safety with HamiltonJet (Waterjet)

published on 1 July 2020

Waterjets are the safest choice for Pilot Boat applications. Our waterjets are engineered with safety in mind, precise steering control and efficient manoeuvrability result in effective and quick reaction to a man-overboard situation, and with no exposed propeller, waterjets provide ultimate safety around people in the water.

0

Article Suez Canal chief hints ‘mistake’ by captain could be linked to Ever Given incident

published on 14 April 2021

The chairman of the Suez Canal Authority has suggested a possible mistake by the captain of the Ever Given could have led to the grounding of the giant container ship in the waterway last month.

1