Proper/Allowable use of Flex Hose?
Proper/Allowable use of Flex Hose?
(OP)
I am designing a piping layout to replace the existing piping for dimineralized water heat exchangers. I need to connect the demin water inlet and outlet headers to allow the heat exchangers to be bypassed, however the elevations of the two headers are different by just over 1".
I have seen flexible (braided) hose used to align piping with pumps, can it also be used to connect these two headers? I'm currently thinking yes, but am wondering if there are other design considerations I am overlooking.
Also, I am having trouble finding manufacturers of 8" flex hose - can anyone provide a possible supplier name?
Thank you in advance for your thoughts and patience,
A new Engineer-in-Training, with just over 1 year experience
I have seen flexible (braided) hose used to align piping with pumps, can it also be used to connect these two headers? I'm currently thinking yes, but am wondering if there are other design considerations I am overlooking.
Also, I am having trouble finding manufacturers of 8" flex hose - can anyone provide a possible supplier name?
Thank you in advance for your thoughts and patience,
A new Engineer-in-Training, with just over 1 year experience





RE: Proper/Allowable use of Flex Hose?
RE: Proper/Allowable use of Flex Hose?
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
RE: Proper/Allowable use of Flex Hose?
One point I would make about flex hose...if its corrugated, be very careful about performance...most corrugated flex has an optimum flow direction as both sides are typically not identical (different slopes and lengths in each side of a corrugation) and you get poor performance if you run it backwards, believe it or not...I learned this the hard way and actually had to swap the corrugated tube out for smooth bore flex tube...
RE: Proper/Allowable use of Flex Hose?
I am thinking perhaps flex hose is not the best option for this project - it may simply be easier to cap both lines and construct a bypass line to connect the two.
RE: Proper/Allowable use of Flex Hose?
I'm a pipefitter by trade and have been faced with this type of problem many times. Generally I just construct an offset using weld pipe to the offset dimension.
I don't know the skills of the people you're working with but it isn't that hard. Your offset angle using a standard L.R.weld fitting would be 16.597°The advance of the offset face to face before adding any flanges would be 6.855 inches. I have a web site that will calculate many types of offsets (free) it might be helpful.
http://home.comcast.net/~offsetaj
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI
RE: Proper/Allowable use of Flex Hose?
Would you by any chance be able to provide a sketch? I -think- I am visualizing it correctly, but a picture would definitely help.
Unfortunately my company has blocked yoru link, so now I have to phone internet security to see if they can unblock it for me...
RE: Proper/Allowable use of Flex Hose?
RE: Proper/Allowable use of Flex Hose?
RE: Proper/Allowable use of Flex Hose?
1. Enter the site, you may have to allow pop ups.
http://home.comcast.net/~offsetaj
2. On the left is a navigation index click on offset selection cart
3. Enter the selection chart skip the tutorial
4. Select the type of offset (Parallel: fitting to fitting)
5. Follow the promter and enter the data. The sketch is roughly the type of offset you're looking at although the angle is far steeper.
6. This is a personel website so some of the decimal places tend to run long.
The angle and dimensions I quoted were based on a 1 inch offset if you give me the exact dimension it wouldn’t be any problem to give you exact dimensions and some layout dimensions as well. (Example the throat and heel arc lengths and the centerline references).
There is also a page on the site that will guide you on how to layout the fitting and how to fit it up so the angle of the offset is correct. The GANG Box has most of the information, you might also check out the Fitting Layout page. Good Luck
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI
RE: Proper/Allowable use of Flex Hose?
Mike Halloran
Pembroke Pines, FL, USA
RE: Proper/Allowable use of Flex Hose?
(I'll have to remember that for next time, to ask what the REAL question is.)
RE: Proper/Allowable use of Flex Hose?
Please correct me if I'm wrong.
RE: Proper/Allowable use of Flex Hose?
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI
RE: Proper/Allowable use of Flex Hose?