Deflection Force from Hydraulic Hose

First you need to figure the force required to "slide a larger straight pipe into and through a section of curved pipe". With undefined properties.

I hope you have a magic wand.

Ask your parents for help, or ask for divine intervention.

Also, it's a good idea to read the FAQ's.

Do your own homework. CR4 is not a homework cheat site; however, if you have questions about understanding concepts or how a portion of a problem is derived, these types of questions will be accepted.

Perhaps you do not know what a pipe is. First, and foremost, pipes are rigid.

Here's a little explanation for you:

1. All pipe is to be made of a long hole, surrounded by metal or plastic centered around the hole.

2. All pipe is to be hollow throughout the entire length.

3. All pipe is to be of the very best quality, preferably tubular or pipular.

4. All acid-proof pipe is to made of acid-proof metal.

5. The O.D. (outside diameter) of the pipe MUST EXCEED the I.D. (inside diameter) otherwise the hole will be on the outside of the pipe.

6. All pipe is to be supplied with nothing inside the hole so water, steam, or other stuff can be put inside the pipe at a later date.

7. All pipe is to be supplied without rust, as this can be more readily put on at the job site.

8. All pipe is to be free of any covering such as mud, tar, barnacles or any form of manure before putting up, otherwise it will make lumps under the paint.

9. All pipe over 500 feet in length must have the words "Long Pipe" clearly painted on each end so the fitter will know it is a long pipe.

10. Pipe over two miles long must also have "Long Pipe" painted in the middle so the fitter will not have to walk the entire length of the pipe to determine if it is a long pipe or not.

11. All pipes over six inches in diameter is to have the words "Large Pipe" painted on so the fitter will not use it for a small pipe.

12. All pipe closures are to be open on one end.

13. All pipe fittings are to be made of the same stuff as the pipe.

14. Pipe specified as "Straight Pipe" shall not have fittings within its length, otherwise it becomes "Crooked Pipe."

BTW, what grade are you in?

I may be wrong but he intends to slide a "HOSE" which is by definition compliant and not a "PIPE" which is by definition stiff. And to push or pull a hose through a stiff pipe does not need the help of magics or a divine intervention.

Again if I am not wrong ( as you know English is a foreign language to me) he wants to know if put under pressure the hose will not straighten too much the pipe.

The question does not seem to me (if it is as I understood) a too simple minded one especially if you consider the 5 ksi as working pressure.

I shall try to give an answer in the way I understood it. If the hose without pressure lies on the pipe wall (internal) when under pressure the hose will exert on it a force limited by the play between hose and pipe stiffness. Such high pressure hoses are rather stiff so that the forces will depend more on pipe compliance in the bending plane. The higher it is the lower the force.

Right, I misread the opening statement.

Now, I don't understand the significance of the straight pipe to the question.

Before reading what has been posted so far, I think you have misinterpreted. Sounds to me like the hose goes thru both straight and curved pipes.

You would have to know physical characteristics of the pipe(ie; force required to bend it)....

http://www.lmnoeng.com/Force/ForceBend.php

http://convert-to.com/195/pressure-units.html

This is a joke!

We haven't decided how the student will push a piece of rigid pipe into a piece of...........................never mind.

This is a joke!

The straight pipe is pvc, and is heated enough to allow it to bend as it enters the copper bent pipe....

So, you are teaching the class?

Wouldn't that be a hoot!

Hey, this is lemonade! What happened to my culture of amoebic dysentery?

--Gary Larson cartoon

42. (But I don't know in which units. )

Henway units, of course.

What's a Henway?

He might be referring to this: "How much does a hen weigh?"

Actually, I was aware. I was politely feeding him the straight line to his set up inquiry.

About 3 pounds? 5 pounds? Some low number of pounds.

That would be a function of mass flowrate, which isn't stated in the original post.

The force exerted at a bend over and above the pressure forces can be considered to be the rate of change of momentum of the fluid in the pipe. Need mass flowrate for that!

Oh, and pipe size, which, strangely, is also missing.

The force is the pressurized area x pressure. as simple as that.

If you make the integration considering the variable radiiaso it is the result you get. The Bourdon tubes are computed with this approach.

As for the last remark.

Unfortunately many are those who make comments without reading what was written before their visit. This is the reason we have mant times long lists of comments which in fact should be from the content point of view a lot shorter.

Total force is relatively simple; total deflection of the curve is a little more complicated.

This will get you off to a good start:

Everything you ever wanted to know about pressure deflection of tubing,but were afraid to ask:

www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA305951

When you finish reading it all, and understand it all, then come back and ask anything you like.

Happy reading!