Hydro Water Quality
Hydro Water Quality
(OP)
When specifying a fab shop hydro of pressure parts, do you require a minimum level of water quality? request fabricators procedure? or use a water quality standard? Thanx in advance
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: Hydro Water Quality
RE: Hydro Water Quality
Yes, your document deliverables from the vendor should always include the hydrotest proceedure to review. Hope this helped you.
RE: Hydro Water Quality
The low chloride level is not enough for hydrotesting the Austenitic S/S vessels, particularly the ones with lots of crevices and areas where water can accumulate and stand. The draining only will retain in crevices the water, which in turn will slowly evaporate, thus concentrating the chlorides in the most vulnerable locations, perhaps over days and days time. This will suffice for the start of a local chloride induced cracking.
Another bad practice is the use of hot air to dry the vessel;- the temperature increase will accelerate the evaporation process, but same time increase also the chance of chloride attack, this time at higher temperature, at a faster rate than otherwise would happen. The results are the same..If possible, a rinse or flushing with demin water could reduce the chance of chloride attack considerably.
I am also developing a vacuum drying process at normal temperature. The results so far are excellent, are independent of the day's relative humidity and far better results for long term storage than any other current procedure. Providing a proper sealing of all openings, it eliminates the need for N2 blanketing, monitoring of N2 supply, etc..
Howzat?
Cheers,
gr2vessels