Large Dia. Pipe
Large Dia. Pipe
(OP)
Does anyone have any experience, or suggestions, regarding hydro. testing large dia. (144") pipe?. Are there any shops that can do this? Generally, it is done onsite.
Would also like some input on the necessity of welding interior AND exteior joints of such large pipe, which will eventually be encased in concrete.
Thanks
Would also like some input on the necessity of welding interior AND exteior joints of such large pipe, which will eventually be encased in concrete.
Thanks





RE: Large Dia. Pipe
Are you the mfg, engineer or the contractor?
What type of pipe are you dealing with?
I assume this is water the pipe is carrying?
What is the operating pressure and temp?
Are you intending to test the pipe or the completed pipeline, installed?
Is it underground pipe?
Any other relevant information...
RE: Large Dia. Pipe
These are AWWA C200 pipe.
RE: Large Dia. Pipe
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Large Dia. Pipe
RE: Large Dia. Pipe
I have seen butt strap joints used where the interior was not welded. Will you be lining the interior with mortar?
RE: Large Dia. Pipe
Not familiar with this larger diameter pipe, but I know for a fact that smaller pipes are hydrotested in the shop.
RE: Large Dia. Pipe
RE: Large Dia. Pipe
RE: Large Dia. Pipe
Regarding the double vs. single welding, and assuming the reference is to lap welds, there are various criteria that are considered in the decision that include: ability to air test the annular space of completed joint, longitudinal stresses, installation constraints and access to the interior or the exterior. More information would likely be needed to offer any more specific response, and perhaps the pipe manufacturer and/or Contractor would likely be helpful in that regard.
RE: Large Dia. Pipe
rconnor's suggestion on jumping the water from section to section is a good one and commonly used in hydro-testing of long pipelines.
Just a couple of questions - what kind of water is the pipeline transporting? You mentioned the sewers couldn't handle the volumes, but unless there is a strict requirement for water quality, would the pipeline in essence not be filled with product after hydrotesting and go straight to the delivery point? Also, if you test it in place, the weight of the water should not be an issue as it will be designed to hold water anyway, right?
I'll agree with the previous posters, I would not accept a pipeline where each individual joint was tested and not at least in sections - you'll know nothing of the integrity of the pipeline, only of each individual joint.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com