Small diameter water supply main next to a gas station
Small diameter water supply main next to a gas station
(OP)
Hi
I am looking at a new water supply main that is to be installed in the near future. The route that we need to take puts us next to a petrol station that has been operating for at least 30 years. It is assumed that there will be some level of hydrocarbon contamination in the soil and that this could potentially impact on the supply main.
We are wanting to use PE pipe as this is economical and will work well in a seismic event (which is paramount for us in NZ).
Does anyone have information on if there is a suitable PE product, or if there is a heat component as to when hydrocarbons leach through PE pipe?
Cheers
I am looking at a new water supply main that is to be installed in the near future. The route that we need to take puts us next to a petrol station that has been operating for at least 30 years. It is assumed that there will be some level of hydrocarbon contamination in the soil and that this could potentially impact on the supply main.
We are wanting to use PE pipe as this is economical and will work well in a seismic event (which is paramount for us in NZ).
Does anyone have information on if there is a suitable PE product, or if there is a heat component as to when hydrocarbons leach through PE pipe?
Cheers





RE: Small diameter water supply main next to a gas station
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Small diameter water supply main next to a gas station
RE: Small diameter water supply main next to a gas station
Incorporates a thin metal liner to prevent leaching of petroleum products through PE which is authorised by the UK water council (I think), but it has been around for some time now. It needs to be jointed using special couplings which also incorporate this so can't be fusion welded.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Small diameter water supply main next to a gas station
If you are convinced that in the face of these realities, and via some wizardry e.g. with the alleged continuity and strength of a thin metal foil and special connectors etc., a "barrier" pipe system will be dependable for the life of the plastic pipe system in the real world, there may also be yet further questions regarding maintenance/repairs of inevitably some field-damaged pipe as well as future connections and future tapping, and maybe particularly once the pipes have absorbed contaminants.
Finally, perhaps a question may need to be asked is the cost of these new pipes (not to mention field labor etc.) really "economical" as you wish when other alternatives are available? Per the list prices I have noticed on page 8 at http://www.plumbinganddrainageplastics.co.uk/SLA%2... it appears only 6m or 12m discrete pipe lengths of all sizes larger than 180mm (~7" dia) are available i.e. no longer "coils", meaning regardless of field layout it appears a lot of field "connectors" and assembly of same will be needed. The listed price per meter e.g. of 225 mm DR11 barrier pipe is £134.40/m (I calculate about 62.28 USD per foot at today's exchange rate.). This manufacturer doesn't appear to even show a price for any larger "couplers", though I noticed on page nine a DR17 and smaller 180 mm, "Fluid Hydraulic Compression" coupler is priced at £470.40 ea (I calculate about 715 USD each!) Of course all kinds of fittings and appurtenances are inevitably also required in distribution systems, and I see here the price of this same sort of "Equal Tees" in these little 180mm sizes is a whopping £1435.34/or ~2,181.72 USD EACH. Whether or not the system will work in the short and long term, it is clear this manufacturer is thus quite "proud" (with such prices, as they say down South) of same.
RE: Small diameter water supply main next to a gas station
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Small diameter water supply main next to a gas station
RE: Small diameter water supply main next to a gas station