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Thanks for your comments. The bridge where we are doing the improvements is actually a railroad bridge... no problems there. Now, I also found that ASTM through various product standards has recommended a Maximum Allowable Deflection Limit of 7.5%. To find the deflection and the loads imposed...

I have already determined that the liveloads over a drainage pipe (part of bridge drainage) that crosses a railroad is approx. 19psi. The pipe I want to use is a 6in. or 8in. PVC SDR18. This might be very simple but how do I determine if this pipe can withstand the load? Thanks

Waterworker. Thanks for the comments and LINKS. Very useful.

I'm looking at a project that seeks to minimize I/I flow in an existing sanitary sewer system(8" to 15"). CCTV inspection of the entire system found all kind of failures: Protruding Taps Root intrusion at joints and lateral connections Broken Pipe Infiltration at joint and lateral connections...

Thank you very much for your input. The reason why we cannot buid a MH is due to its size and lack of room at the present site. I have already started a preliminary plan to extend the new line a couple of hundred meters to the nearest existing manhole where some work will have to be done. The...

We have a project where we will be connecting (discharging) to an existing 54" brick sewer (old but in relatively good condition). Installing a new Manhole is not an option. has anyone tapped into a brick sewer? any tips?? thanks

Hello! I have a 36" sewer (under pressure) that holds over 200,000 gallons of sewer when we stop the flow from the Lift Station. In order to repair such section we are required to drain most of it through an 8" valve on the lowest point due to the lenght of the pipe (1000' from one end and over...

BRIS thanks for the links. Very helpful. dicksewerrat these are some other details: how deep is it? < 11 feet Sanitary sewer, under city street, the existing pipe is prestressed concrete cylinder pipe (some of the concrete core has collapsed exposing the steel cylinder). Access is limited...

Hello. I've read a lot about trenchless tech. to rehabilitate existing sewer mains (Cured-in-Place lining, Slip lining, Pipe bursting). Does anybody know the range of prices for these types of pipe rehabilitation for a 36&quot; sewer line? The project (sewer main) where we want to consider these...

ishvaaag - thanks. It does not look like something related to runways but I would like to read it. could you please send me a copy of that document? qaztor@yahoo.com Focht3 - As it says it is a RUNWAY. It is an existing runway with the pavement strenght capacity described. Since the original...

A runway has a pavement strenght of 23,600 lbs(single wheel loading). This might be very simple (or not?) but I haven't been able to find information on how to convert or co-relate single wheel loading with Dual wheel loading. In other words which is the Dual wheel loading of such pavement? how...

Our project includes the installation of a new Self-Service (credit card) dispensing fuel station (fuel farm), on the aircraft parking apron that we are reconstructing. I'm looking for information on airport's fuel farms (small-general aviation) design. All I have is AC150/5230-4 but it gives...