abrassive wear in temporary surface lines
abrassive wear in temporary surface lines
(OP)
Hello,
currently im studying the abrassive wear in killmud surface lines.High flowrates nescessary (80fps) are not unusual. I found some models that i can use for a prediction of erosionrate. My scope of work consists also of finding out what guidelines other service companies have with solid particle abrassive wear.
I had some contact with Baker hughes and FMC technologies.They use both the guideline of a maximum fluid velocity of 40fps. Both companies do not know where it is based on. it is just a rule of thumb, even no references.
My question is: Does anyone heard of this maximum fluid velocity before? and could you give any references?
Kind regards,
Lemster
currently im studying the abrassive wear in killmud surface lines.High flowrates nescessary (80fps) are not unusual. I found some models that i can use for a prediction of erosionrate. My scope of work consists also of finding out what guidelines other service companies have with solid particle abrassive wear.
I had some contact with Baker hughes and FMC technologies.They use both the guideline of a maximum fluid velocity of 40fps. Both companies do not know where it is based on. it is just a rule of thumb, even no references.
My question is: Does anyone heard of this maximum fluid velocity before? and could you give any references?
Kind regards,
Lemster





RE: abrassive wear in temporary surface lines
Also try very hard not to call any pressurised pipe "temporary" - it leads to all sorts of poor design, construction and testing - call it "limited life" or "phase 1" or anything but "temporary". As a designer you actually have no guarentee that your "temporary" pipe won't be there in 10 years time.....
The velocity limits you mention are probably field based practical limits to avoid wearing out pipes and fittings in a short period. The other aspect is that at flow rates much above 4-5 m/sec, you could generate huge surge pressures if a downstream valve closes such that your piping would almost certainly rupture if there are no surge relief systems fitted.
Basic guidelines are remove the solids if you can, if not limit the velocity to such a level that it keeps the solids entrained, but no more and use the correct materials.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: abrassive wear in temporary surface lines
Thank you very much for your response!:)
The reseach i currently do is to see how long they can pump with this temporary kill-lines. if everything goes well, it will not take longer than 5 hours to kill the 'blowing out' well when a reliefwell is drilled. By the way, it is a dynamic kill operation. a dynamic kill operation is done by a relief well wich is drilled near to the well that is blowing out. The lines(15000psi) are "portable" to say it in another way.
thanks for the effort
Kind regards,
Lemster
RE: abrassive wear in temporary surface lines
“For clear water in hard-surfaced conduits, the limiting velocity is very high. Velocities in excess of 40 fps (12 m/sec) have been found harmless to concrete channels.” (It is not stated whether those were actually somehow measured velocity, or back-calculated from someones slope and formulae assumptions). From what little information that has been supplied here, it's very possible this doesn't apply to your service. I will note however that that phrase was followed immediately in that manual by:
“Erosion of inverts may result from much lower velocities when sand or other gritty material is carried.” (It then goes on to say that in continuous high velocity flow conditions where grit erosion is expected to be a problem the limiting velocity often is taken to be about 10 fps (3 m/sec))
RE: abrassive wear in temporary surface lines
thank you for your view.
Maybe they have the theory in common of 40 ft/s. but yes, it sounds that it doesnt apply to Ductile low alloy steel. I will search further. Maybe i find something on other companies.
have a nice day!
Kind regards, Lemster
RE: abrassive wear in temporary surface lines
Richard A. Cornelius, P.E.
WWW.amlinereast.com