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SEMIJim 07-20-2008 08:50 PM

Good Source For Hose Fittings?
 
Hi All,

About to embark on an upgrade for our boat: Adding an engine raw water intake strainer. Going to need some fittings. Wondering what a good source for them are?

There are two kinds of "barb" fittings: One kind is what I think of as a "traditional" barb fitting, the other is a barrel that's smooth, with two ridges. I'm thinking the latter, double-clamped, is the better way to go? But I don't see them anywhere.

Right now the fitting coming out of the through-hull is a right-angle 1/2" NPT (apparently) brass fitting. You can see it in the lower-left of this picture:

http://www.LinxNet.com/misc/sailboat...71-314x420.JPG

The plan is to mount the strainer aft of the fuel/water separator/filter you see in that picture.

Right now I'm thinking I want to go with this Shurflo strainer:
http://images.westmarine.com/full/011_332_001_503.jpg

I'll then want the fitting coming out of the seacock to go straight up, so I can run the hose straight up and into the inlet side of the strainer.

I'll also possibly need fittings for the strainer to adapt its I/O to the hoses.

Complicating things is the fact that I think the existing hose is already over-sized for the existing 1/2" NPT fittings (I was able to easily slide a plastic male/male fitting labeled "3/4" into it) and I'm thinking of replacing the Oberdorfer pump with an MMI pump that, inexplicibly, has 3/8" NPT fittings.

TIA,
Jim

Maine Sail 07-20-2008 09:29 PM

Jim,

Please, for your own sake, don't buy that strainer. It's barely worth the cost of the corrugated cardboard packaging it is shipped in. I had one on a Catalina and it was one of the first things to go!!

As for bronze barb fittings Jamestown Distributors, Hamilton Marine or Defender all stock them..

You want a real bronze, easy to clean strainer like this one made by Perko. It will hold LOTS of grass and sea weed before it reduces flow!!
http://www.pbase.com/mainecruising/image/77944333.jpg

It's sort of a pay now or pay later sort of thing.

Here are some ideas:

#1 You want the least amount elbows on your way to the strainer as possible.

#2 You want to use the biggest hose on the way to the strainer as possible. If your thru hull is a 1" full flow use 1" hose. If it's a 3/4" valve use 3/4" hose. I recommend a min of 1" intake hose to the strainer so that WHEN, not if, you need to snake it to clear it of weeds you can actually get a snake through it... I have converted every boat I have ever owned to a 1" intake system from the seacock to strainers intake port.

#3 You want to use either bronze or Marelon for all fittings bellow the waterline!! No nylon or PVC!!!!

#4 You want to use wire reinforced marine hose to keep the dia of the hose constant even with a radius bend.


P.S. Never mind you're on a rather sea weed free lake... I'll leave the info for others.. the advice about that strainer still stands though...

Oh and do something about those solid copper fuel lines before your forking over big green to the EPA..!!!!!!;);););)

SEMIJim 07-21-2008 10:41 AM

Quote:

Originally Posted by halekai36 (Post 343804)
Jim,

Please, for your own sake, don't buy that strainer. It's barely worth the cost of the corrugated cardboard packaging it is shipped in. I had one on a Catalina and it was one of the first things to go!!

For what reason? Too small, so it filled-up/plugged too fast?

The reason I ask, and the reason I'm hesitant to spend $150, vs. less than $50, is all we're talking about here is a relatively crude strainer of which not all that much is demanded.

We're on a well at home. It's got a 1 HP pump capable of delivering 18 gpm. (And it does it, too. Trust me.) It pressurizes the system to over 60 psi peak. Between that pump and the water softener is a filter--all plastic from top-to-bottom. It has a 5 micron disposable filter cartridge in it. Now I figure if a piece of plastic can stand up to years and years of what our water pump can throw at it, at 5 microns, no less, certainly a well-built plastic strainer can do no less for significantly less volume, pressure and fineness.

Quote:

Originally Posted by halekai36 (Post 343804)
As for bronze barb fittings Jamestown Distributors, Hamilton Marine or Defender all stock them..

Ok, I'll check those out. Thanks! (WM doesn't have all that good a selection, looked like.)

Quote:

Originally Posted by halekai36 (Post 343804)
You want a real bronze, easy to clean strainer like this one made by Perko. It will hold LOTS of grass and sea weed before it reduces flow!!

I certainly want it easy-to-clean, which was one thing I liked about the Shurflo design: The bowl unscrews. So if you get it filled up with sediment, you simply unscrew the bowl and dump it out over the side. No muss no fuss. (Just like our home water system filter.)

I do want whatever I get to hold lots of grass, weeds, etc. before flow is significantly impacted.

Quote:

Originally Posted by halekai36 (Post 343804)
Here are some ideas:

#1 You want the least amount elbows on your way to the strainer as possible.

I knew that, but thanks :)

Quote:

Originally Posted by halekai36 (Post 343804)
#2 You want to use the biggest hose on the way to the strainer as possible. If your thru hull is a 1" full flow use 1" hose. If it's a 3/4" valve use 3/4" hose. I recommend ...

As I said: Looks like the current fittings are 1/2" NPT. I appreciate the recommendation, but I'm disinclined to replace a thru-hull that seems to be providing ample water to the engine. Besides: The current pump is only 1/2" NPT and the one I'm thinking of replacing it with is less, at 3/8" NPT. (Dunno why.)

Quote:

Originally Posted by halekai36 (Post 343804)
#3 You want to use either bronze or Marelon for all fittings bellow the waterline!! No nylon or PVC!!!!

Yup, that was what I wanted.

Quote:

Originally Posted by halekai36 (Post 343804)
#4 You want to use wire reinforced marine hose to keep the dia of the hose constant even with a radius bend.

I wondered what kind of hose I wanted. Thanks. I may have to replace all the hose.

Quote:

Originally Posted by halekai36 (Post 343804)
P.S. Never mind you're on a rather sea weed free lake... I'll leave the info for others.. the advice about that strainer still stands though...

We're far from anything resembling "seaweed-free," believe me. In fact: We're slipped at the end of a canal and sometimes the entire surface is a weed mat. One reason for the strainer, and one reason I want the screen area to be as large as I can fit in the available space.

Quote:

Originally Posted by halekai36 (Post 343804)
Oh and do something about those solid copper fuel lines before your forking over big green to the EPA..!!!!!!;);););)

You know, I wondered about those. Funny thing: When we were discussing fuel/water separators/filters last season, I used that same picture and I don't recall anybody saying anything about those copper lines. Maybe I just forgot. New-to-us boat, lots to remember :p.

Thanks for your comments, halekai36. I may not follow (all of) your recommendations, but that doesn't mean I don't appreciate and respect your input.

Jim

Maine Sail 07-21-2008 02:37 PM

Jim..
 
Jim,

In short that strainer had a lot of shortcomings.

#1 Sea grass or eel grass, the long skinny ones, would not make the turn into the basket and would clog the intake it was my gut feeling that this was due to it's constricted size.

#2 Because of size I needed to empty it often. The bowl and housing are made of different plastics and as such required teflon grease to operate easily otherwise they would bind on each other.

#3 The gasket between the bowl and housing would tend to "bunch" as you tightened the bowl back on sometimes requiring two or three attempts at making it leak free.

#4 The bowl comes off the bottom and in the ocean, you would not worry as much in fresh water, it is a royal PITA if the strainer is not the highest part of the intake system as ALL the SALT WATER in the hose comes spilling out into your engine compartment!! I much prefer a top clean out!!

#5 Finally my clear housing cracked at the threaded portion and after calling every chandlery and SureFlo I decided to ditch it as the part was hard to get and far to fragile for my liking.

#6 As I removed it I noticed that the bronze hose barbs, that had been installed into the housing, had cracked it!! I had not noticed it leaking but where the male threads of the hose barb went into the housing was cracked.

#7 The metal bracket on mine was galvanized steel NOT stainless but I do think they have modified this since...??

So that is my experience with the strainer you posted. Mixing bronze and plastic is never advised and the differing expansion characteristics are most likely what cracked the housing. As for the clear bowl that NEVER should have split!!! Tried two different o-rings and both acted the same..


For the $50.00 more this Perko 1/2" bronze intake strainer is a VERY good value!!!

1/2" Perko Strainer / Hamilton Marine
http://store.hamiltonmarine.com/prodimg/PKO-493.JPG

Stu01 07-21-2008 03:45 PM

What issue does the EPA have concerning brass fuel lines?
Stu

TxLnghrn 07-21-2008 03:52 PM

Gotta go with Hal
 
Jim,
Gotta agree with Hal on this one, I just replaced my entire raw water system with a Perko like the one pictured, all new bronze fittings, new reinforced hose and double hose clamps for about $170 purchased at a local chandlery. Considering I leave my engine intake throughull open when I'm away during the week I sleep much better knowing something stronger than plastic parts are keeping my boat afloat. :D

Just my .02
Michael

Maine Sail 07-21-2008 05:34 PM

Quote:

Originally Posted by Stu01 (Post 344083)
What issue does the EPA have concerning brass fuel lines?
Stu

While the ABYC allows for the use of annealed copper fuel lines they are, and can be, a poor choice on a small boat due to the sever vibrations caused by the small aux diesels.

There have been many fuel spills due to work hardened copper fuel lines that broke and then spilled fuel into the bilge which was then pumped into the ocean or lake.. this is where the EPA comes in..;););)

SEMIJim 07-21-2008 08:40 PM

Quote:

Originally Posted by halekai36 (Post 344064)
Jim,

In short that strainer had a lot of shortcomings.

I guess so! All right, you convinced me :).

Quote:

Originally Posted by halekai36 (Post 344064)
For the $50.00 more this Perko 1/2" bronze intake strainer is a VERY good value!!!

I agree. Okay, that's what I'll get.

Now I just have to see if I can find the fittings I want. I'm off to check the places you suggested.

Certainly WM will have the hose I need, right?

Thanks,
Jim

SEMIJim 07-21-2008 08:46 PM

Quote:

Originally Posted by halekai36 (Post 344121)
While the ABYC allows for the use of annealed copper fuel lines they are, and can be, a poor choice on a small boat due to the sever vibrations caused by the small aux diesels.

We don't have a small aux diesel, we have a small aux Atomic 4 ;). Besides: The line isn't copper all the way to the engine. The line running aft from the fuel/water separator/filter changes to a flexible line a little way back, before it leaves the bulkhead, and that short length of flexible line then loops over to the engine.

Jim

SEMIJim 07-22-2008 10:18 PM

List Of Materials
 
Hal,

If I could bother you for some assistance? Here's what I believe I'll need from Hamilton Marine:I only can't see what hose there is appropriate. There's "hose water heater" listed on this page, but the smallest size is 5/8".

This is a lot easier when you can just walk into the store and snag various parts right off the shelves until you get a bunch that all actually fit together :p.

Thanks,
Jim


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