Exploring the: Water Zone
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Guarding Against Counterfeit Parts
We have been doing a lot of defense work lately and are concerned about counterfeit parts. How can we protect ourselves?
On-Site Treatment or Off-Site Disposal
Can you provide information on a pH/precipitation system that will speed up the process of removing metals and patina chemicals from wastewater?
Clean Wastewater Attacking Zinc Plate
We use ion exchange treatment for wastewater from our nickel, hexavalent chrome and zinc plating rinses. What kind of characterization should we do to identify the pollutants that are affecting our products, and what steps are needed to reuse this w...
What is the best way to reduce hexavalent chrome to trivalent chrome from an aluminum conversion coating rinse water?
More PVC Pipe Glue Discussion
I would like to comment on the ongoing pipe glue discussion from your November 2011 column. Users concerned about caustic service could look for what one manufacturer calls “industrial PVC cement” which is made without the fumed silica thickener. Fo...
Nitrites and Fragrances
We are using a vibratory finishing compound that has been satisfactory for more than 20 years. Recently, a potential new vendor pointed out that it contains sodium nitrite and said we are violating the law in using it. We checked with our supplier, ...
When our mass finishing equipment is started after being shut down a week or more, an extreme stench emanates from the entire system. How can we control this problem?
Pipe Glue, Revisited
I’ve contacted several plumbing suppliers and none of them were able to assist me in finding the glue you recommended for CPVC pipe or the pipe tape. We are seeing exactly what you were talking about on a leaky pipe containing caustic or alkaline s...
Where is the Pipe Glue?
I have contacted several plumbing suppliers around me, and none of them were able to assist me in finding the glue that you recommended for CPVC pipe or the pipe tape. We are seeing exactly what you were talking about on leaky pipe containing causti...
Caustic Piping Remedies
When I reviewed our operations, I was struck by how many of our PVC and CPVC piping joints that carried either caustic for wastewater pretreatment or alkaline cleaner exhibited a crusty scale, apparently dried caustic residue.