We use transition fitting from the HDPE pipe to stainless steel NPT then thread on check valve, ball valve, union, then transition back to HDPE. Although the 3" is a bear to tighten, as mentioned there is a tendency to overtighten. back when I was doing fire sprinkler system design/installs we...
We have been having the same problems with leaking at SS threaded joints on fittings larger than 2" in general. Nearly all of the 3" diameter nipples and fittings are leaking especially the unions. Many time is seems that the SS threads sieze and you just cant crank it any tighter even with a...
I believe between 10-15 feet on the seepage collection. I have specified environmental motor and pump-end (316SS and Teflon) and SDR11 HDPE. Sizing for velocity > 5fps to encourge scour and reduce buildup of any metal precipitate.
should probably conduct a simple bail-down recovery test to see if you have any sustained recharge of LNAPL into the well. It may takes weeks for product to accumulate in the well again. Skimmer pumps are fairly expensive ($2,000 to $3,000 each) in addition to air supply, containment, materials...
We are looking to place several groundwater extraction wells or collection sump into mine tailing pile to remove mass from potentially entering an adjecent creek through connected hydraulic seeps. Looking for additional ideas vs. traditional electrical submersible pumping, pneumatic options I...
Yes, API has excellent references, guidance, and modeling tools for estimates of product recovery based on monitoring well thickness as well as pumping and applied vacuum scenarios. Be aware that a very sound understanding of the vadose zone properties and liquids involved is an absolute in...
Have you looked into Oxygen Releasing Compounds such as the products offered by Regenesis. They will do a site evaluation for you and give a recommendation based on site specific data. Check out their site at
http://www.regenesis.com/products/treatable.aspx
This is the link to the...
I have been playing with some different technologies as site conditions are quite heterogeneous -- we have been conducting an extended RI and finding all sorts of interesting subsurface conditions affecting product and groundwater recovery. I am currently running pilot tests using the Xitech...
I was involved in a large scale pump and treat remediation system at an EPA Superfund site remediating hex chrome (Cr+6) contaminated groundwater. Process used initial influent pH adjustment (6.5 down to 5.0) with sulfuric acid followed by bag filtration and finally ion exchange. P&T has been...
[bigears]
Anyone have any luck remediating groundwater contaminated with 1,4-dioxane. Aerobic enhnacement (oxygen releasing compounds) and UV are very expensive with the volumes were are looking at. I have read articles discussing phytoremediation as a possible method.
[b]Thanks for any...
Looking for some general concensus and feedback on approach for LNAPL recovery. Have a fairly thick product layer on watertable with +/- 5 ft seasonal groundwater flux. Propose oileophilic top loading skimmer pump (Xitech) with vacuum enhancement (up to 10" H20). Area is in sandy-silts...
The use of electron donors (hydrogen releasing compounds-polylactate ester)and development of an anaerobic environment are quite effective at remediating chlorinated solvents insitu. The use of air stripping as part of a simple pump and treat system is also very good. I have used both...
