Brimmer,
[indent][/You ask very good questions. I am not an operator and really do not have an answer as to why they leave the water stagnant for so long within the pipe. The water is, however, allegedly de-ionized water that should be very low on all counts (chlorides, TSS, ETC.). I really...
It's all over the pipe, however it is more aggressive in the HAZ and areas of stagnant flow. It just so happens that the leaks are rearing their ugly heads at the HAZ's first. I'm not a metallurgist, just relaying what the lab reported.....
To r6155,
I should have responded to the question posed above as to how the lab determined that the failures were induced by water.
The welds that formed leaks are associated with an RO water service that is intermittently used. It can remain stagnant for up to 6 months before flow is...
So, here is the deal. The previous systems were hydrotested by the contractor of the units using demineralized water. A few months later, water started leaking from the heat affected zone of alloy welds. That being said, the welds were sent to the lab and found to be water related. So...
Unfortunately, no and no to (littleinch). There is a specific paragraph in the specification for no oils and no re-use of water previously used in testing (even if it is re-filtered). I think I have hit the "brick wall" with this one. I really don't see the need to use "nuclear surgical grade"...
Unfortunately the water supplied to the site does not even come close to the requirements for this specification, as I am on the weekly mailing list from the municipal water district for their reporting. In addition, they do not test for everything listed. I agree that chlorides of 50 ppm is...
All,
I have been tasked with meeting a specification for hydrotest water purity that seems a little "stringent". Usually DI water was sufficient at other sites, however, now I have a new specification to meet with water purity as follows:
Chlorides 50 ppm max (SS) 100 ppm max...
