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I think it's as follows, F= Flange, H=hub; Mech CPLG 150= mechanical coupling; I'm not sure about the 150.

Thank you all.

Looking for a definition of "mass excavation" within the context of an infrastructure project in highly urbanized city.

bimr, The pipes are located in a street, with heavy traffic; cross each other at an intersection; both are steel, 48-inch in diameter; clearance between the mains will be 12" or greater. About 30 feet of the bottom main are to be encase in concrete (wire mesh + 8" concrete all around)...

Both mains are clean water.

What would be the main reason(s) for encasing in concrete a 48-inch steel main crossing perpendicularly under another 48-inch steel main? The main is to be encased even if the specified minimum (12") clearance between the mains is achieved.

I also agree with coloeng. But if an approval order is to follow: geometry; shop drawings; laying schedule, sounds practical.

I confess to be at a loss with your answer. The question is, and I apologize if it was not clearly understood, after the geometry, what comes next? the laying schedule or the shop drawings. I've read specs. that indicated that the laying schedule follows the geometry, then shop drawings come...

I have seen conflicting specifications regarding whether shop drawings or laying schedules follow the approved geometry drawings of trunk water mains. Any thoughts on this?

I'm looking for a concise definition of "sewer influence lines" . How are the influence lines determined/specified?

Qshake-thank you for your post.

What would be the best, concise definition of "bridge hardening"? Or, in other words, when used in general terms what is "bridge hardening". Though a civil engineer, this not my field. Thank you.

diggerman, You are stating a definition of "freeboard." That, can be found easily. The "understanding" of freeboard is what has been discussed here in the context that was used (see above),in the language quoted from an RFP. Also see the attached image. What is your understanding? On a...

bimr, Your first thought was correct--the valves are (proposed the work has not been done yet) in series. The pipe runs east-west. The valves are installed close to each other, a few feet away (I only saw a rough drawing). There are two shaft connections (coming out of the same shaft); one...

I think that the reason for the 2-valve arrangement is operational safety, redundancy for the system. If only one (1) valve is installed and that valve needs to be serviced/repaired a large section of the system is affected. The "bigger picture" here is that the arrangement is large (48-inch)...

Sorry no pictures available yet; still looking. The arrangement of the two adjacent butterfly valves I am referring to is for trunk water mains (48-inch in diameter). So the concept of "either way" feeding is still applicable on a large scale (i.e. feeding a large section of a city). My question...

I recently saw a configuration that included two(2) 48-inch butterfly valves proposed to be installed a few feet from each other. There was nothing in between the valves--i,e. no pipes, no fittings, no special pieces, etc. The valves were proposed for a pipe that connecting two separate shaft...

When the CBs are inspected there may not be standing water inside them; also these CBs are standard size, so to have that vertical distance measured (the actual available; from top of accumulated fill/non-flotating debris) will in fact give you a volume. But you are right, better to have the...

msquared48--please see that my initial questions was related to the following quote: "check the quantity of freeboard below the [catch]basin hood" (from an RFP) listed as one of the tasks of the selected consultant. Now, please take a look at the attached sketch as it does represent well the...

The RFP is active; I'm getting ready to respond to it and will ask for clarification. Thank you so much.