Reply
 
Thread Tools Display Modes
 
Old 06-04-2015, 12:50 PM   #21
Guru
 
koliver's Avatar
 
City: Saltspring Island
Country: BC, canada
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 2,167
Another pump on my boat is the holding tank dump pump. I have aY on the inlet side. Y fwd is to empty the Holding tank, Y aft is to suck from the bilge. I have a square, flat sucker end so that this pump can take the bilgewater down to 1/4" deep, whereas the Rule pumps elsewhere in the bilge can only get it down to 1.5" deep, or so. Not a huge capacity in an emergency, but every little bit helps.
I also carry a crash pump, 2". I have used it to wash off the docks, help other guys, and once, to drain a high water event in my own bilge. Works good, lives up top, in the open air, under a blue canvas cover, so nobody sees the rust but me. It helps to run it on a regular basis, so you know the ethanol hasn't ruined the gas in its tiny tank. I also try to fill with premium gas when I can, as I do with all of my small gas engines, just to limit the ethanol damage.
__________________
Advertisement

koliver is online now   Reply With Quote
Old 06-04-2015, 12:50 PM   #22
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,887
Not in all collision cases do you want to be underway....thus a shaft bolt on pump is nice but still only a piece of the puzzle.

Usually it will take a collision or some kind of hull breach to beat a 2 inch trash pump. Sure a failed sea cock...but reasonable maintenance should beat that issue.
__________________

psneeld is offline   Reply With Quote
Old 06-04-2015, 03:56 PM   #23
Guru
 
fryedaze's Avatar
 
City: Solomons Island Md
Country: USA
Vessel Name: Fryedaze
Vessel Model: MC 42 (Overseas Ltd) Monk 42
Join Date: Sep 2011
Posts: 1,052
Quote:
Originally Posted by Britannia View Post
I think it's just over half that (135 gpm)

Chart for Determining Flow of Water Through Holes in Gallons Per Minute
Flooding.html

However - it's still a huge amount of water. For my trip back from Alaska we rigged a 3700gph bilge pump with a long hose and power leads with alligator clips. It's in the engine room since that's where the batteries are and that's the most important bilge to protect. The idea is just to drop the pump into the bilge and throw the hose overboard and hook up to one of the 6 8D batteries in the engine room. Still, that's only another 60gpm.

The truth is, if I were to suffer a 2" hole in the hull, my chances of finding and plugging it would be slim unless it was in the forward third of the boat. There is so much tankage and other equipment that I would be lucky to find and plug the hole in time. Even in the forward section of the boat it would mean crawling beneath the sole in a very tight area that was rapidly filling with water.

In practice, the most likely failure would be a through hull - and I know where all of those are.

Scary when you start to think about it a lot.

Richard
Your probably correct. 235 just sounds to high. HTFF classes were too long ago and I am to lazy to go figure out Mr. Bernolli's equation.
Dave
__________________
Dave Frye
Fryedaze, MC 42 (Monk 42') 1989 Overseas Co
http://mvfryedaze.blogspot.com/
fryedaze is offline   Reply With Quote
Old 06-04-2015, 04:02 PM   #24
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,887
My concept...if not the concept of all damage control isn't necessarily stopping all leakage....just reducing it below pumping capacity.

As long as it's enough to gain on the level and start better repairs.
__________________

psneeld is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 09:34 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012