Bilge Pumps - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 01-29-2007
Senior Member
 
Join Date: Jul 2006
Location: Corpus Christi, Tx
Posts: 1,071
Thanks: 20
Thanked 23 Times in 22 Posts
Rep Power: 9
ccriders is on a distinguished road
Bilge Pumps

My boat has one bilge pump that is operated from the cockpit, just aft of where the helmsman would sit. It is a manual Whale Gusher 8. I want to add an electric with float switch. How do I go about sizing a bilge pump? My boat is a Pearson 28. Also, is it wise for it to be plumbed to use the same through hull fitting as the manual pump?
John
Reply With Quote Share with Facebook
  #2  
Old 01-29-2007
PBzeer's Avatar
Wandering Aimlessly
 
Join Date: Nov 2002
Location: Cruising
Posts: 20,248
Thanks: 0
Thanked 86 Times in 83 Posts
Rep Power: 14
PBzeer has a spectacular aura about PBzeer has a spectacular aura about PBzeer has a spectacular aura about
For size, go with the largest that will fit in the space you have for it. I would plumb it to a new thru-hull though. That way, heaven forbid, if you need to use both at once, you can.
__________________
John
Ontario 32 - Aria

Free, is the heart, that lives not, in fear.
Full, is the spirit, that thinks not, of falling.
True, is the soul, that hesitates not, to give.
Alive, is the one, that believes, in love.
JCP


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
- Website & Blog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 01-29-2007
Thanks Courtney.
 
Join Date: Sep 2006
Location: IL
Posts: 3,954
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 11
T34C has a spectacular aura about T34C has a spectacular aura about T34C has a spectacular aura about
If starting from scratch, I would install 2 electric pumps. For the first I would get a small pump with the smallest diameter hose fitting available. I would install this pump in the bottom of the bilge. This first pump will run anytime you get water in the bilge and with the small diameter hose you will get less backflow into the bilge when pump shuts-off and keep your bilge drier.

I would then install the largest pump that will fit, as PB suggested, on a stand or platform about mid way down into the bilge. This second pump will be available to do the true heavy lifting in case of major water intrusion. This is a method that has been suggested by a number of different authors, in a few publications. Seems to represent the best possible solution.
__________________
hunter Legend 37 Semper Paratus
Formerly - Tartan 34C Yawl
Reply With Quote Share with Facebook
  #4  
Old 01-29-2007
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
I'd second T34C's suggestion... since many boats have small, annoying leaks, and those need to be dealt with on a periodic basis... and then a larger, high volume one for emergencies.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #5  
Old 01-29-2007
Owner, Green Bay Packers
 
Join Date: Sep 2006
Location: SW Michigan
Posts: 10,318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice
You can use the same thru-hull but will need to install line check valves to each discharge line prior to their becoming common discharge. With two electric pumps plumbed this way they would tend to fight each other, with one or the other doing the only work, but with your manual, positive displacement, pump you will not have that problem.
34's idea is the best way to cover all contingencies. I have seen "portable" pumps made up with a small dc pump mounted to a broom handle or such, with the discharge hose running up along the handle, and the electric cord extra long with alligator clips. This allows one to move about, from compartment to compartment, with the pump and not be constrained by discharge plumbing and "hard" electrical wiring.

A strainer box around the base of the pump is not a bad idea, but can probably be omitted if the pump location is readily accessible. "Readily accessible" is usually not the low point in your bilge, unfortunately. It does not hurt to think about having to remove the pump, to clean the suction screen, while having a foot or more of dirty water over it-in the dark! A pump location that may not pump your bilge completely dry, but is easily accessed, may be of more importance when that bad day arrives where you've really got to move some water. Which I guess brings us back to where 34 came in.
Reply With Quote Share with Facebook
  #6  
Old 01-29-2007
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Check valves in bilge pump lines are generally a really bad idea. They add a fair amount of back-pressure to the output lines of the pumps and greatly decrease the output volume.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #7  
Old 01-30-2007
Senior Member
 
Join Date: Nov 2006
Posts: 318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
wildcard is an unknown quantity at this point
Speaking of which, my thru hulls are below water line and every wave splashes back into the hose draining into the bilge. I have the hose pinned up as high as it can go. Im wondering if there is a check valve or better yet a "trap" I can put in there? Never had this problem so bad before. I wonder if a loop in the line would work?
Reply With Quote Share with Facebook
  #8  
Old 01-30-2007
Member
 
Join Date: Oct 2004
Location: San Diego
Posts: 48
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
awayocean is on a distinguished road

The best system on my opinion is – Pump that does not stay in the water / beneteau comes with such factory installed / pick up hose with strainer at the end in the lowest part of the bilge. Warning light and sound alarm connected to the pump. Pump hot wired to the house battery with switch ON - AUTO / never off / , fuse appropriate size. Wiring / connections / should be done with heat shrinking isolation and anti corrosion grease.
Thru-hull at transom above the water line, hose with loop / you can see it when water starts coming out / specifically designated only for this pump and NO check valves. Float switch should have exposed floating part / you can check system operation every time you are on board by lifting the float with your finger. Keep the area around the float free of items that can collapse on top of float. Keep your bilges clean of debris. Buy BIG bilge pump, the smaller the boat the faster will sink from same size hole at the bottom.
Good luck
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #9  
Old 01-30-2007
Owner, Green Bay Packers
 
Join Date: Sep 2006
Location: SW Michigan
Posts: 10,318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice
A properly sized check valve should provide minimal back pressure and little reduction in volume. Aside from the obvious ability of keeping the water moving in one direction they will also protect centrifugal pumps from extraordinaryly high head pressure as well as back-spinning of the impeller at shut-down, the latter being a major cause of premature pump failure. Spring check valves are much more reliable and flexible in usage. I would not recommend a swing check valve. Your hand bilge pump is actually just a couple of checks valves.
Reply With Quote Share with Facebook
  #10  
Old 01-30-2007
Senior Member
 
Join Date: Nov 2006
Posts: 318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
wildcard is an unknown quantity at this point
So my loop idea is valid? I guess I have never seen or needed to look for a check valve. This is another first. Who the heck would put thru hulls UW? Discharge ones anyway. I like to see when my pump is running.
Another question, who makes a pump that stays dry? That is the pump is not in the water.....
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



All times are GMT -4. The time now is 10:24 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.