Eccentric reducer?

[kimhi]

Has anyone ever heard of an eccentric reducer? I am looking for one to use on a sewer line so that I can slope the first part of the pipe @ 1/4" per foot and transition to 1/8" per foot further down. The fitting I'm thinking about looks like the one here:

http://www.weldbend.com/Fittings/Concentric & Eccentric Reducers/stdconcecc.htm

Also open to other suggestions for fittings to accomplish this. Any ideas? thanks in advance.

 

[pennpiper]

I don't understand your question or your problem. Your example shows an Eccentric Reducer, so that what they are. They are a standard fitting used in many different types of projects.
Contact a pipe fitting supplier in your area and present your situation to them, I am sure they will be able to offer an answer.
Regards.

 

[kimhi]

Is there a national supplier of such a fitting? The one from Weld Bend looks like its made for industrial applications and not commercial plumbing.

 

[sbnz]

kimhi,

As pennpiper mentioned, the "eccentric" reducer (as shown in Weld Bend site) is very standard and not a special application as you may be thinking. I am not from US but all pipe fitting manufacturers would be able to offer you reducers in either concentric or eccentric type. The basic speicifcation for the reducer is identical for both types, viz, large and small end nominal sizes, schedule, end prep etc.

Eccentric reducers are extensively used in any liquid transmission pipeline to avoid liquid pool formation in the lower corners of the concentric reducer when draining the line.

regards,

 

[unclesyd]

What is your material of construction?

 

[kimhi]

Cast iron.

Thanks for the responses so far.

 

[djack77494]

You use a reducer to change the diameter of a pipe, not to change the slope of a line. THe small slope change you are talking about, 1/8" per foot, can be achieved by adjustments to the piping supports. The piping itself, unless you are talking about large diameter, heavy walled pipe should be flexible enough to accomodate your design.

 

[unclesyd]

Still more questions.
what type pipe end do you have on the CI, flange, hub or hubless?

If it is a hub end you can get the required slope with a double hub coupling. A hubless fitting is a little more challenging unless you have flexible fitting. With flanged pipe you can use wedge ring, flared fitting or built up box.

Here your flanged reducers.

http://www.acipco.com/adip/fittings/flanged/reducers.cfm

http://www.metalfit.com/catpg12.html