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Pipe Pressure Withstand

06/24/2013 2:42 PM

Interesting user question-

I have HDPE Pipe (class- ESDO), 16" diameter, DR=11, 1.455" thick that had a 1 -inch diameter hole drilled in it 3/4 -inch deep. Remaining wall stands as follows - 0.705 remaining wall. Design Pressure= P= 60 PSIG, Design Temperature= 90F, Hydrostatic design stress 699 PSIG. My question is will I have to repair or replace and if not what is the guaranteed life in the condition it is in?

I asked what ESDO was and he didn't know. The basic question looks like "Will an HDPE pipe with a 16" diameter and 1.455 wall thickness with a 1 diameter hole drilled 3/4" deep withstand a 700 psig hydrostatic load?"

Not sure if the location along the pipe matters here... I'm pretty sure no one can or will offer "guarantee" on expected life .

Thanks.

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#1

Re: Pipe Pressure Withstand

06/24/2013 3:10 PM

What color is the pipe? Is the hole facing down or up or on the side? Are you willing to stand in front of the hole during test? There's your answer....

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#3
In reply to #1

Re: Pipe Pressure Withstand

06/24/2013 3:22 PM

The hole is on top it is 3/4" deep and 1" diameter It is Black HDPE DR11. Where can I find the encroachment of minimum wall ? I believe B31.1 states 12.5% of the wall is max encroachment.

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#4
In reply to #3

Re: Pipe Pressure Withstand

06/24/2013 3:36 PM

.... between eight percent and 12.5 percent of the pipe wall, depending on pipe size, type, and grade....

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#5
In reply to #4

Re: Pipe Pressure Withstand

06/24/2013 3:48 PM

16" DR11 1.455 wall thickness.

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Guru

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#9
In reply to #3

Re: Pipe Pressure Withstand

06/24/2013 9:16 PM

Alarm, dual identity Paddy is Persius!

The gods must like you!

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Guru

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#2

Re: Pipe Pressure Withstand

06/24/2013 3:11 PM

Is penetration in the inside diameter or outside diameter?

Not that it matters.

No guarantee of any kind would be my answer, regardless.

It is up to the supplier of the pipe and the controlling local, state, and national permitting agencies.

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Guru

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#6

Re: Pipe Pressure Withstand

06/24/2013 4:22 PM

It is wonderful what can happen on these pages.

Lo and behold, Persius has answered his own question, his pipe doesn't meet code!

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Guru
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#7

Re: Pipe Pressure Withstand

06/24/2013 4:56 PM

What is "hydrostatic design stress"? What about the 60 psig design pressure? What pressure are you actually applying?

At 60 psig internal pressure, the material stress on the remaining 0.705" wall is about 550 psi.

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Guru

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#8

Re: Pipe Pressure Withstand

06/24/2013 6:09 PM

Being HDPE pipe any competent plastics welder should be able to fix that just as any metal welder would fix a metal pipe with a similar issue.

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#10

Re: Pipe Pressure Withstand

06/25/2013 3:50 AM

It will, provided:

  1. An appropriately-rated proprietary repair kit is applied to the affected area, or
  2. The affected area is cut out and an appropriately-rated proprietary joint piece is used to couple the two ends back together, or
  3. It has been tested hydraulically to some measure of safety. 1.5 times maximum working pressure for the temperature of operation seems appropriate as a first suggestion although the pipe manufacturer will have published a temperature/pressure ratings table and a test protocol that need to be followed. In the event of it failing during that test, apply either no.1 or no.2 above.
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Guru

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#11

Re: Pipe Pressure Withstand

06/25/2013 10:11 AM

( time and time again ... )

Not enuf info...!!! "My question is will I have to repair or replace and if not what is the guaranteed life in the condition it is in?"

Guaranteed life for WHAT application?!?

Neither you, nor anyone else has provided an answer to WHAT CLASS is "ESDO"...?

Water piping is NOT subject to the same Standards / Codes as piping that will carry gas, oil, or other hazardous liquids.

Much less, if it's simply a dang "drainage" type of line, who cares a bleep!

As I'm sure lyn would agree (and many others as well), try a simple google search, and, "pick-an-expert" ... like, for example, try contacting someone who's worked with such line, and ask them, before bringing LOTS of specs and "useful details" to a forum such as this, for a more exhaustive analysis...

Don't MAKE EVERYONE GUESS ! (cuz guaranteed , they WILL...!)

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#12

Re: Pipe Pressure Withstand

06/26/2013 9:05 AM

Thank you all for your input. I appreciate it.

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Anonymous Poster #1
#13

Re: Pipe Pressure Withstand

07/23/2013 3:49 PM

Per AWWA C906-07 DR 11 regular PE3408 pipe has a "maximum working pressure rating" of 160 psi at temperatures that do not exceed 80 degrees F. (less at higher temp.), and drilling a 1" hole about halfway through its wall at any location will not strengthen it, but instead create a point of localized stress concentration. Does that answer the question?

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#14

Re: Pipe Pressure Withstand

07/23/2013 3:54 PM

Yes and thank you. This issue has been resolved as of 7-14-13

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Guru
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#15
In reply to #14

Re: Pipe Pressure Withstand

07/23/2013 4:25 PM

Well, what happened on 7/14/13? Did the pipe blow up, or not?

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#16

Re: Pipe Pressure Withstand

07/23/2013 4:27 PM

No

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Anonymous Poster #1
#17
In reply to #16

Re: Pipe Pressure Withstand

07/23/2013 5:13 PM

[I think what may have thrown at least some of us off here was the use of the acronym "psig" (I believe normally referring to gauge pressure) in the OP, as well as "hydrostatic" in the restatement, when I think it was probably meant that the 699-700 referred instead to a stress level in the wall.]

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Users who posted comments:

Anonymous Poster (2); IdeaSmith (1); lyn (1); ndt-tom (1); passingtongreen (1); Persius (5); PWSlack (1); SolarEagle (2); tcmtech (1); Tornado (2)

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