What hose should I be using to connect seawater strainer to engine? I tried 3/4" 80psi heater hose but configuration of inlet to engine is such that I need to do a 180o bend in a small space and hose crimps and seems likely to impede flow of water to engine.
Saltwater hose to engine
- Thread starter 4Winds
- Start date
Wire wound exhaust hose. The wire prevents the hose from collapsing.
Is it possible to rotate the pump body 180 so the discharge is looking up and suction is down?
OK, have been looking for CORRUGATED Marine Wet Exhaust Hose 3/4" ... You will not believe how unbelieably expensive this hose is if you can even find it ... many many retailers are out of stock in the 3/4" diameter. This country has really set itself up for hell. The supply chain is broken.
I need a corrugated rubber hose that can tolerate extreme bends in 3/4". This hose is often marketed as "marine exhaust/water" hose .. ie two applications, same product. I'm looking for either. And my point is that in this diameter many providers are out of stock.
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,794
Fisheries supply in Seattle has it by the ft.
www.fisheriessupply.com
Or on the east coast... Defender
www.defender.com
Trident Marine Hose 321-0346 | Fisheries Supply
Save More on Your Trident Marine Hose #321-0346 321 WIIRED Ocean Flex Marine Hose - Multi-Use Hose, 3⁄4" ID - 1.188" OD at Fisheries Supply. Excellent Customer Service, Ready to Ship. Marine Supplies Since 1928!
www.fisheriessupply.com
Or on the east coast... Defender
Trident 250/100 Flex Marine Wet Exhaust and Water Hose
Trident's Flex Marine Wet Exhaust and Water Hose is designed for longer bent connections, and features an EPDM rubber construction and 2-ply reinforcement for increased resistance to heat, ozone, exhaust, sanitation chemicals, panting and collapse. Featu
Go to Defender.com and search for marine grade below the waterline hose of the dimensions you require. Hoses of this type can bend 90 degrees without collapsing. Trident is a good brand. Here is a hose that should work for your application, sea water strainer to engine cooling water. Trident 132 Heavy Duty Water, Air, Drain & Heater Hose
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I don’t think you want corrugated. The corrugations are known for creating a lot of resistance to flow. The wire reinforced hose others have suggested would be a better solution for those bends.
Corrugated hose is the last thing you want in there. Simple exhaust hose is what you want.
Trident or Shields brand hoses are good. Doubt wire reinforced hose is necessary. Do not use corrugated hose.
An angled hose barb at the pump would reduce the required bend, but that leads me to another question. That tight hose loop looks like something may be missing. It’s hard to tell from the photo, but is there a sea strainer out of view or does that hose go direct from the seacock to the pump with no strainer? A hose up to a bulkhead mounted sea strainer and then down to the pump would coincidentally eliminate the tight hose bend you have now.
An angled hose barb at the pump would reduce the required bend, but that leads me to another question. That tight hose loop looks like something may be missing. It’s hard to tell from the photo, but is there a sea strainer out of view or does that hose go direct from the seacock to the pump with no strainer? A hose up to a bulkhead mounted sea strainer and then down to the pump would coincidentally eliminate the tight hose bend you have now.
Hmm now I am confused. I have heard from others that the corrougations actually prevent the crimping, since
The strainer is located next to the thru hull fitting in the center of the boat, about 5' away. The original hose was corrugated to allow the 180o turn. Ordinary wire- and non-reinforced hose at 3/4 will crimp without the corrugated wire rings because of the 180o bend (already tried). I, too, have discovered Trident and Shields produce this product, but it is not available anywhere on the market it seems in 3/4" diameter (larger diameters no problem). The access to the engine on the Hunter 33 is *very* restricted; in the front of the engine where the hose is located there is IMO no room to attach a hose with large bend (or strainer) because of the way the stairs connect to the deck and bulkheads. i have two more suppliers , whom will (hopefully) get back to me today. Failing that, it seems given space issues and the crimping caused by noncorrugated hose, perhaps the 180o elbow proposed by Richard19068 may be the most effective solution. Quite frustrating situation.
Unfortunately, words do not convey the information that pictures do. With a few routing changes, this will not be complicated.
DO NOT mount heavy brass fittings on this hose. They are unsupported and swinging loose. If you hit the harmonic vibration of the hose and fitting as a unit (often at idle), they will swing wildly and you can imagine the rest.
Please take numerous pictures showing as much detail as possible. Help us to help you.
DO NOT mount heavy brass fittings on this hose. They are unsupported and swinging loose. If you hit the harmonic vibration of the hose and fitting as a unit (often at idle), they will swing wildly and you can imagine the rest.
Please take numerous pictures showing as much detail as possible. Help us to help you.
Good. Glad there is a strainer. I couldn’t tell from the photo. That takes me back to thinking that a 45° or 90° angled hose barb on the inlet side of the pump would take out much of the required hose bend.
The Trident hose that I referenced in my reply above will take a 180 degree bend without collapsing. I've tried it and it will. The application in question is below the waterline and this reinforced hose is designed for that purpose. I question whether the original corrugated hose was reinforced and designed for below the waterline applications.
Thanks! I contacted SeaStarSolutions (Dometic) and they now sell this SeaStar Solutions, which is designed for below the waterline applications and they guarantee a 180o turn in 4 inches(!) It replaces their 252 series hose. I got it at www.go2marine.com, although it seems to be available in a couple other locations. I had issues with the SKU and images provided by those places so stayed with go2marine. I will report back my success or folly here in probably a week .... I so appreciate all the advice from everyone. This is a generous group.
That seems to be an appropriate hose for your application.
Hoses are not all that complicated. In general hoses should have a smooth bore, i.e. there are no ribs, bumps, or anything that would cause turbulence in the water flow or allow crud to be trapped.
Hoses that are used to suck, need reinforcement or they will be prone to collapsing and cutting off circulation. And by reinforcement I do not mean layers of some kind of fabric ply. One of the most common means of reinforcement is a (much detested) heavy spiral wound wire embedded into the hose. Other hoses, like the Trident Bilge pump hose has a thick prominent rib on the outside of the hose, the bore is smooth. Others, like some of the Shields sanitation hoses use a thick stiff material with slightly raised ribs.
The purpose of the spiral wire winding is to prevent collapsing from vacuum pressure caused by the pump. The material the hose is made of determines the flexing and bend radius. Take a look at the Raritan SaniFlex hose, it is wire wound and it is very flexible, however, the Trident 101/102 hoses are wire wound but not that flexible. The main difference is the material the hose is made from.
Unreinforced hoses are fine where the hose is pressurized, like on the downstream side of a pump. The fluid pressure will prevent the hose from collapsing. They are also fine for air vents, like tank vents.
Why is the wire in a spiral wound hose detested? Once you try to cut one you will understand. The wire appears to be a hardened steel wire that is exceptionally difficult to cut and cut ends cut skin quite nicely.