There's that navy humidity reasoning again

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Merlyn
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Re: There's that navy humidity reasoning again

Postby Merlyn » Sun Nov 12, 2017 7:10 am

Don't forget BP for your next trip.
A/F ( imperial ) for US.
Metric for Europe.
( Tool kit that is )
Hate for you to get caught out.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

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Big Pete
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Re: There's that navy humidity reasoning again

Postby Big Pete » Mon Nov 13, 2017 1:35 am

But where do they use Rohr threads?
BP
It is always better to ask a stupid question than to do a stupid thing.

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D Winsor
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Re: There's that navy humidity reasoning again

Postby D Winsor » Mon Nov 13, 2017 5:18 am

Big Pete wrote:But where do they use Rohr threads?
BP


I don't know about Rohr thread but I do know about where Whitworth threads are used :lol:

BP I understand what you are saying about issues with drainage systems on A/C Systems. After thinking about it for a while I'm inclined to believe that part of the issue being experienced with the naval vessels could have someting to do with not being able to effectively prevent condensate collected on the A/C coils from being blown back into the ship.
Over my years on the Great Lakes where there are always major issues with humidity too high in the summer & too low in the winter. I've run to many issues with condensate due to the differntial pressure across the coil to draw the condensate directly off A/C coils or out of the condensate catch pan under the coil and passed right back into the ship again, if the A/C system on full recirc, a clogged air filter or if for some reason condensate drainage system became ineffective due to the difference in air pressure or blockage. This is especially true, as it was on many of the "Canadian" built ships I was on, if the A/C coil is placed directly in the suction air duct very close to or coupled to the ventilation fan rather than a separate Air intake space designed to minimumize differntial pressure across the coil and more effective condensate drainage. Where space is a premium on a naval ship I would not be surprised if the system was setup with the A/C or chiller coils mounted in the fan suction air duct.
Troubleshooting 101 "Don't over think it - K.I.S.S. it"

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Merlyn
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Re: There's that navy humidity reasoning again

Postby Merlyn » Mon Nov 13, 2017 6:23 am

The Rohr question?
Right or Left hand?
Single or two start thread?
V form or Acme threads?
Need to know in order to answer correctly.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

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Big Pete
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Re: There's that navy humidity reasoning again

Postby Big Pete » Mon Nov 13, 2017 12:40 pm

Ah Merlyn,
You are over thinking, I believe Rohr threads were available in all flavours, just like Whitworth, Metric or American Course.
BP
It is always better to ask a stupid question than to do a stupid thing.

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Merlyn
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Re: There's that navy humidity reasoning again

Postby Merlyn » Mon Nov 13, 2017 12:48 pm

Bit stuck on this one, your question as to where do they use Rohr threads?
Stab in the dark, Outer Hebrides?
Close?
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

wes
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Re: There's that navy humidity reasoning again

Postby wes » Mon Nov 13, 2017 2:55 pm

I worked on an old B&W Alpha from the 60s earlier this year which had a broken fitting on it...double male, one end whitworth, one end bsp..that was fun to find a replacement. No lathe on that old ship either. I had to replace a bunch of piping, and yup, it was a surprise which was BSP and NPT. Fun engine room. It was for a cylinder lubricator.. small feed tank to the actual lubricator pump assembly, which btw leaked like SOB even after cleaned and good old black silicone (I almost wrote black silicon..that would've been embarassing!!).

Also yeah, come on navy...get your shit together!!!

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Big Pete
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Re: There's that navy humidity reasoning again

Postby Big Pete » Tue Nov 14, 2017 7:44 am

Merlyn,
You are heading in the right direction for the Rohr threads, keep going East.

BP
It is always better to ask a stupid question than to do a stupid thing.

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Merlyn
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Re: There's that navy humidity reasoning again

Postby Merlyn » Wed Nov 15, 2017 12:50 am

BP
" keep going East "
We talking True North or Mag. North bearings here?
Learnt Rohr is pipe in German.
We talking Mr Man Country here?
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

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Big Pete
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Re: There's that navy humidity reasoning again

Postby Big Pete » Wed Nov 15, 2017 1:36 am

Scandinavia, there should be a diagonal line across the "O" but I can't find it on my keyboard. I believe they used to use it before they went Metric.
I only came across it once.
BP
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Merlyn
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Re: There's that navy humidity reasoning again

Postby Merlyn » Wed Nov 15, 2017 3:33 am

BP
Never heard of that one before, wonder what thread form angle it was ? (55 or 60 being the norm.)
Wonder if the tpi vary like the other thread forms.
One of jobby eh?
Different.
Scandy threads maybe.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.


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