Bilge pump fittings

Technical information and geeky boat stuff
Post Reply
User avatar
Quetzalsailor
Master of the Arcane
Posts: 1102
Joined: Fri Aug 26, 2005 9:53 am
Boat Name: Quetzal
Boat Type: LeComte North East 38
Location: Philadelphia, PA

Bilge pump fittings

Post by Quetzalsailor » Mon Apr 05, 2010 10:18 am

So, how come are bilge pumps made with 1 1/8" od un-barbed connections and 1 1/8" id hose sold, but no other fittings are available??? I need a couple ells and a union for my 'quick-easy' bilge pump removal scheme. Clearly, I can go from 1 1/8 to 1 1/4 for the union, but I still want to do it 'elegantly', simply, with few fittings.

User avatar
Hirilondë
Master of the Arcane
Posts: 1321
Joined: Thu Dec 28, 2006 8:50 am
Boat Name: Hirilondë
Boat Type: 1967 Pearson Renegade
Location: Charlestown, RI

Re: Bilge pump fittings

Post by Hirilondë » Mon Apr 05, 2010 1:12 pm

I can't imagine you would have any issues with the connections. I bilge pump line is not under any significant pressure.
Dave Finnegan
builder of Spindrift 9N #521 'Wingë'
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
Gresham’s Law of information: Bad information drives out good. No matter how long ago a correction for a particular error may have appeared in print or online, it never seems to catch up with the ever-widening distribution of the error.

Case
Skilled Systems Installer
Posts: 278
Joined: Sun Jun 05, 2005 9:59 pm

Re: Bilge pump fittings

Post by Case » Mon Apr 05, 2010 2:03 pm

Its a way for the bilge pump makers to make money off you. Many bilge pump companies make their own crappy overpriced corrugated hoses... they happen to be the only ones to make 1-1/8" hoses so they specced their own pumps to take that hose...

1-1/4" should be fine or 1" that's heated before installing should be fine. Go for smooth, not one of those spiral or corrugated hoses.

- Case

User avatar
Quetzalsailor
Master of the Arcane
Posts: 1102
Joined: Fri Aug 26, 2005 9:53 am
Boat Name: Quetzal
Boat Type: LeComte North East 38
Location: Philadelphia, PA

Re: Bilge pump fittings

Post by Quetzalsailor » Mon Apr 05, 2010 3:59 pm

Apparently you can get some, in bronze, from McMaster Carr.

You're quite right, these things need merely to be there without fretting about corrosion or fatigue; there's essentially no pressure. I had imagined, silly me, that if they sold equipment with a certain size connection, that the fittings would be available without much issue. I expect that I can heat the hose up and form it onto a 1 1/4" barb.

Zach
Boat Obsession Medal Finalist
Posts: 697
Joined: Wed Jan 25, 2006 6:28 pm
Location: Beaufort, North Carolina
Contact:

Re: Bilge pump fittings

Post by Zach » Mon Apr 05, 2010 7:25 pm

If the hose is tight on the 1 1/8 you can use a 3/4 pipe nipple, and a street L to make the connection to a more normal size hose. Hose barbs are beautiful things, but a pipe nipple long enough to have a smooth land and the threads provides room for two hose clamps. A lot of commercial boats have cooling systems done with nipples, as barbs shrink the hose size down 1 size... which can be a bad thing depending on the size of the system.

My hunch is that the coast guard requires (required?) hard run pipe run for bilge pump manifolds on commercial boats. Just so happens that a 1 inch copper pipes outside diameter is 1 1/8 inch.
I would have no problem with a soldered T connection, given the coast guard inspector required my run of bilge lines in Noel to be soldered copper lines... I would use Type K, as the wall is a lot thicker than the household stuff.
Outside diameter stays the same...

Cheers,

Zach
1961 Pearson Triton
http://pylasteki.blogspot.com/
1942 Coast Guard Cutter - Rebuild
http://83footernoel.blogspot.com/

User avatar
Quetzalsailor
Master of the Arcane
Posts: 1102
Joined: Fri Aug 26, 2005 9:53 am
Boat Name: Quetzal
Boat Type: LeComte North East 38
Location: Philadelphia, PA

Re: Bilge pump fittings

Post by Quetzalsailor » Mon Apr 12, 2010 10:28 am

I've bought 1" copper fittings. Unfortunately, the union is partially cast brass. Since I would inspect these, and can readily, I guess I'll get away with it. Photos will follow; I've got a nifty neat installation for the pump partially made.

Skipper599
Candidate for Boat-Obsession Medal
Posts: 304
Joined: Mon Mar 16, 2009 1:48 am
Boat Name: "MACUSHLA"
Boat Type: Passage 24-30 Cutter
Location: Cloverdale in Beautiful BC Canada.

Re: Bilge pump fittings

Post by Skipper599 » Sat Nov 03, 2012 5:47 pm

Hi Quetzel ... whatever happened to the pictures you promised of your bilge pump lines?
I am: Bob of Wight.

s/v 'Ros Na Cosquin'
a 'Passage - 24'

There are good ships, there are wood ships, and these ships sail the sea

But the best ship, is friendship and may this always be! ... ... ... A prayer from Ireland.

User avatar
Quetzalsailor
Master of the Arcane
Posts: 1102
Joined: Fri Aug 26, 2005 9:53 am
Boat Name: Quetzal
Boat Type: LeComte North East 38
Location: Philadelphia, PA

Re: Bilge pump fittings

Post by Quetzalsailor » Sun Nov 04, 2012 11:15 am

Bob,

I recall posting these a couple years ago, but here they are again.
The base and the 1" square tube is McMaster-Carr's fiberglass, epoxied together.
The Rule's strainer is bolted to the fiberglass base. The copper ell slips loosely over the pump discharge and is held in with the wire tie. Not shown in these pics is that, when the pump is dropped into the deep bilge, the upper end of the tube is tied to a sole beam and there's a union between the horizontal and the vertical discharge hoses. Easy to separate the hoses, untie the tube, and lift the whole thing out for service.
IMG_2753-r.JPG
IMG_2754-r.JPG

Skipper599
Candidate for Boat-Obsession Medal
Posts: 304
Joined: Mon Mar 16, 2009 1:48 am
Boat Name: "MACUSHLA"
Boat Type: Passage 24-30 Cutter
Location: Cloverdale in Beautiful BC Canada.

Re: Bilge pump fittings

Post by Skipper599 » Sun Nov 04, 2012 1:48 pm

Hello Quetzal; thanks for this, maybe you posted them in another spot on the forum. I'm very interested in how you did this because I'm not happy with my current set-up and I can see yours definitely has an advantage eg: the ability to lift the pump out for servicing. I like the look and idea of the device you mounted the pump on ... looks pretty slick. I'll need to make up something similar myself. Thanks again.
I am: Bob of Wight.

s/v 'Ros Na Cosquin'
a 'Passage - 24'

There are good ships, there are wood ships, and these ships sail the sea

But the best ship, is friendship and may this always be! ... ... ... A prayer from Ireland.

Post Reply