Scott
A nominal 2" schedule 80 (XH, extra heavy) pipe has OD of 2.375" and an ID of 1.939" which gives a wall thickness of 0.218".
A nominal 2" XXH, (extra extra heavy) pipe has OD of 2.375" and an ID of 1.503" which gives a wall thickness of 0.436".
If it were my boat and this was a part of the pressure hull, I would go with the XXH pipe as the incremental weight is not that much and this gives you a higher factor of safety. If this is just a support structure, I would go with the Sch 80.
Cliff
From: Scott Waters <muddywatersfarm@hotmail.com>
To: psubs <personal_submersibles@psubs.org>
Sent: Sat, July 24, 2010 10:43:01 AM
Subject: [PSUBS-MAILIST] blue print problems
I have a confuseing issue with the K-350 blueprints. On blueprint number 4 the cabin flood nipple it says 2"x3" XXH pipe nipple, but blueprint number 13 says is a 2"x4" sched 80. I am confuesd what I need to use for the cabin flood nipple. I think the sched 80 will work just fine, but maby there is something I am overlooking. Anyone know what needs to be used?
Thanks,
Scott Waters
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