# Thread: per 100 m against the line of keel sighting

1. ## per 100 m against the line of keel sighting

Hello everybody!

Last Friday I came across "per 100 m against the line of keel sighting". It occurs in GUIDE FOR SHIPBUILDING AND REPAIR QUALITY STANDARD FOR HULL STRUCTURES DURING CONSTRUCTION. Could you help me decipher this phrase. I haven't the slightest idea what it can mean.

Thank you.

www.eagle.org/eagleExternalPortalWEB/ShowProperty/BEA%20Repository/Rules%26Guides/Archives/87_Shipbuilding%26RepairQualStand_HullStruct_Const/Pub87_SRQS_Guide

2. ## Re: per 100 m against the line of keel sighting

That is a 44-page document. How are we to search for the phrase you are asking?

3. ## Re: per 100 m against the line of keel sighting

I found it in the top right-hand corner of table 8 on page 11.

Originally Posted by tedmc
How are we to search for the phrase you are asking?
I think your browser has a search function, but I am not a teacher.

4. ## Re: per 100 m against the line of keel sighting

There is not so much problem finding the phrase as understanding the meaning of it.

5. ## Re: per 100 m against the line of keel sighting

The diagram in the table is self-explanatory. It is a specification stating the tolerance of the straightness of the keel.
The tolerance is the accceptable limit of deviation of the measurement of a manufactured component, in the case the keel of a ship.
The manufacturing process cannot be perfect and small deviations are accepted, within limits.
It is expressed as 50mm per 100m, meaning the straight edge of the bottom of the keel should not run off by 50mm(2") for every 100 m (25mm for every 50m, etc). The line of keel sighting is as shown in the diagram, which is the side elevation of the keel.

6. ## Re: per 100 m against the line of keel sighting

Does "run off" in your explanation mean "deviate"?

7. ## Re: per 100 m against the line of keel sighting

Yes, it does.

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