Simplify, there are several steps to conduct Draft Survey on board. A marine cargo surveyor must follow the procedure that obligate to keep away from inconsiderable fault. The procedures are as below mentioned:
A. Preparing Survey Forms, Documents and Equipments.
Survey forms, documents and equipments are very important thing that have to prepare by surveyor primarily before conduct Draft Survey, because it will assist and support surveyor duties.
– Survey Forms :
1. Draft Survey Report
2. Ship’s Draft Survey and Certificate of Weight
3. Tank Sounding for ballast, fresh water and fuel oil
4. ASTM Table 54B for oil
– Supporting Documents :
1. Bill of lading or Manifest (for Discharging)
2. Draft Survey Loading Port
3. Hydrostatic Table / Displacement Table
4. Cargo specification and data
– Equipments :
1. Computer or Calculator, Pen and Notebook
2. Density Meter or Hygrometer
3. Sounding Tape, and Water & Oil Paste
4. Flash Light.
The Equipment must be in good condition to prevent if there any fault in reading and calculation results.
B. Step By Step Draft Survey
The surveyor has to prepare the best step when he is arriving onboard, it will ensure to conduct Draft Survey correctly, to reach an accurate result. The step that may take by surveyor divided as below:
1. Learning all data has collected that includes data’s of cargo and vessel quantity table.
2. Confirming and permitting in the manner of job that will conduct to Master/Chief Officer.
3. Reading the draft marks clearly and correctly. It is recommended to use small boat to reading draft
4. Making sounding or gauging for ballast, fresh water, fuel oil diesel oil, lubricating oil and all liquids that are exist onboard. includes the density of liquid on tanks
5. Knowing about Light of Ship and Constant onboard.
6. Checking the density of sea or river water where the vessel docks.
7. Making computation for reading draft, correcting with fore/mid/aft distance correction (if any), and then correcting with density of dock water and minus with all liquids onboard (deductible) accurately.
8. After getting Net Displacement minus with Light Ship and Constant to gain Total Amount of Cargo Onboard.
9. For any disputes, surveyor has to check the computation that he made previously.
10. Collecting documents relate to survey.
For more complete references, you could download the Draft Survey Code from UNECE in PDF file HERE
September 15, 2016
Hi.. You are welcome. Have a nice day..
July 14, 2016
HI DEAR i’m starting this job as a trainee so i’m anew student if we can talk like that so i need help formulas and advices to better career as a surveyor and draft survayor thanks SENIOR BEST REGARDS
May 6, 2013
Dear BMP Marine,
Thanks for coming and leave the comment down here.
Regards,
Surveyors
April 2, 2013
Nice post. Draft surveying is one of those things you have to do right.
July 13, 2012
Thanks Ask..
The same with your opinion.
When all the requirements in the calculation of survey based on the Draft UN / ECE Code 1990 followed, the accuracy could be expected in the limit:
– For ship >10,000 DWT between 0.1 s / d 0.3%.
– For ship <10,000 DWT between 0.3 s / d 0.6%.
In fact the practice of this ideal condition can rarely be achieved minimum range within the limits 0.5% of the total weight.
When the technique is still less true implementation, the deviation can be achieved up to 1%. Here the experience and skill of surveyor are involved.
For the survey rate is depends on location and client.
Regards,
Surveyors
July 10, 2012
Excellent article – thank you. I believe that a regular draft survey process – before and after loading and including paperwork takes approx 3 hours and maybe the accuracy is at around 0.5% –
Also in Australia I believe a survey is charged at approx $500 per complete survey.
What are your thoughts on this?
October 22, 2011
Hey Its very usefull website I am getting too much tips for draft survey. Thanks & keep it up.
October 4, 2011
Hi Pradip,
Just go a head, keep learning from senior at your office.
Regards,
Surveyors
July 13, 2011
I am working marine & cargo survey company as a draft surveyor . I am commerce graduate . I would like to better career as a draft surveyor .
June 25, 2010
How is everyone, very helpful info about the industry can be find here on sevensurveyor.com, this is a really great place. Thank you all for interesting posts.I work in the offshore positioning industry providing some of the smallest products for subsea navigation. One of the most popular product I have is TOGS (tiny fiber optic gyro), it is one of the smallest in the world. Feel free to visit my website oceanographic survey website and tell me what you think about it and other of our products.
March 3, 2010
Thanks Gary,
Considering to post it soon.
Regards,
Faisal
February 26, 2010
nice topic..can u include next time computations in surveying liquid cargoes?bsrgrds.
February 15, 2010
Genial post and this fill someone in on helped me alot in my college assignement. Say thank you you on your information.
February 3, 2010
Thanks Robert,
Hope can make it better and better..
February 3, 2010
Your site was extremely interesting, especially since I was searching for thoughts on this subject last Thursday.
–Robert Shumake
October 3, 2009
Thanks Tuannguyen,
The lcf correction is use for trim correction in case that Centre Flotation in not at Midship. First trim correction is correction Draft midships to true mean at the point LCF Draft (longitudinal-dinal Center of Flotation). This correction is known as layer correction
The nemoto correction or shift correction is LCF (Longitudinal Center of Floatation) occurs when the ship changed Trim. Location of LCF as listed in the hydrostatic data, commonly applied to the situation even keel boat (Draft front and back together). Draft at LCF final location is required.
September 27, 2009
I’m interesting with yrs website. Many useful things here, so can you explain clearly the lcf correction and nemoto correction in draft survey fomular ?By the way I’m surveyor too, but I understand why to correct this ? Help me. Thanks
September 6, 2009
Hi Dred,
I wish you could contribute something here.. thanks ;)
August 28, 2009
hey:) I have been glancing over the site for awhile. Needed to contribute=)
August 20, 2009
Nahfristhit, Thanks to tell the truth.. :)
August 20, 2009
Hi Debt…
Thanks.. will consider it..
August 20, 2009
Thanks Gooroura. I just try to write down what I find around.. :)
August 20, 2009
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Finally, I came across that forum!
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August 17, 2009
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June 19, 2009
Thanks for blog post. It’s really imformative read.
I really like to read surveyors.wordpress.com.