No, thanks. When you say that you have a study that contradicts this, and you've published it, send me a link. Meanwhile I'm going with BoatUS.
Bilge hose "plugged" no discharge
- Thread starter daviddp
- Start date
More from BoatUS:
"Bilge pump hose needs to be extremely flexible, strong enough to resist attack from chemicals, and it needs smooth internal surfaces to allow water to flow freely. Corrugated hose, seen in many installations, saps as much as 30 percent of the bilge pump's capacity because it creates extra friction."
http://www.boatus.com/seaworthy/a-hose-is-a-hose.asp
"Bilge pump hose needs to be extremely flexible, strong enough to resist attack from chemicals, and it needs smooth internal surfaces to allow water to flow freely. Corrugated hose, seen in many installations, saps as much as 30 percent of the bilge pump's capacity because it creates extra friction."
http://www.boatus.com/seaworthy/a-hose-is-a-hose.asp
Please don't start just flinging links at me. In this one, the word "corrugated" never appears. What's your point?
That I have done many pump calculations in my life as an Engineer. I did one for my boat. No significant flow loss from friction. If your line is >20 feet long, perhaps.
No need for me to study and publish. It is called fluid dynamics, basic engineering course.
Jim...
No need for me to study and publish. It is called fluid dynamics, basic engineering course.
Jim...
Maybe the corrugated hose you used was smooth inside? Explain this. Were these guys smoking dope, or something?
Part of the problem is air compresses water doesn't. The standard bilge pump moves lots of water but doesn't have much pressure. The Johnson pump puts out 630 gph on the level, add a 3 foot head and the flow reduces by 1/6, to 525 gph.
Now I have to go figure out why my refrigeration pump i snot pumping.
It was working just fine last Sunday.Gotta love boats.
These pumps are bench tested and rated with no loads, add a long and large diameter corrugated hose, a few heads of lift, pump motor inefficiencies and heat and you will be lucky if that 1000 GPH pump pumps out 200 GPH in the real world. Any little blockage on the discharge hose can impair water flow. Some burrowing critters can nest in you discharge port and block the flow. Most pumps if they have a long run and a steep lift can return water to the bilge when the pump turns off and create a repetitive cycling loop where the same water is pushed up the hose and down the hose continuously. Check and see if the hose is pinched or obstructed, check the voltage at the pump and if possible reduce the load by run and lift. Going to a smaller diameter hose will improve the pumps capacity, not the volume of flow but the ability to push water.