I'm looking at options for fasteners used for mechanical joint connections in water main construction projects. The typical "cor-blue" bolts are hardly corrosion resistant, aside from the manufacturer's claims. We are looking at 304 or 316 stainless steel, but I'm wondering if there are any...
I'm working on a project where I need to run a bunch of 1" copper services over the top of an existing 48" storm sewer. Crossing over the top will allow for about 5 ft of cover over the new water services. I plan to insulate over the top of each 1" service whenever the cover is less than 6 ft...
Any thoughts as to corrosion resistance of 17-4 stainless versus 304 SS? This would be for a hydrant rod/stem. The rod might sit in stagnant municipal water at times, and fluctuate between a wet and dry conditions, typically dry though. Temps would be cool, from about freezing to maybe 60 or...
Our contractor completed a small pipeline project, backfilling the trench with a predominantly sand material which also included some stone as well. Upon having several compaction tests taken, the material was seen to fall in the 90 to 95 percent range, failing our required 95% modified min...
I am considering lining some old cast iron pipes, in lieu of dig and replace. The process appears to involve cutting open the existing main, pull a liner through, then inflating this liner with water or steam. Once the liner cures, a robot runs inside the pipe and cuts holes at the service...
Hello all,
I need to drill some HDPE under a small river with some fairly steep banks.
Just wondering if there is a ball park figure on how much I can deflect the pipe joints. I am looking to install about 100 feet, have not yet determined by total vertical drop as of yet.
Anyone have any experience in rehabbing old mains via lining? I am looking at Insitumain, something that will provide both leak and structural support.
I am most curious on the overall cost savings...
I am looking for a table or chart that shows equivalent diameter between 2 or 3 smaller diameter pipes and one larger diameter (for water main). For example, a 12" diameter main has the same capacity as two 8" mains.
I remember seeing some tables on the internet some time ago, but just can't...
I am looking at restraining some push on pipe as part of a water main relay. The purpose of the restraint is to minimize the number of businesses that will be shut down as connections are made - in other words, the ability to connect onto a valve that is under pressure but restrained on the...
I've very little experience in lift station design but was recently asked to review a lift station & forcemain submittal.
The estimated inflow to the 8 ft diameter lift station is 400 gpm. The lift station has 2 pumps, each rated at 400 gpm. Both pumps are off at say elevation 100. Pump #1...
Any online resources for pressure reducing stations?
I am curious as to how they work, and if they can reduce pressure to a set psi, or if it's just a set number of psi it takes off the head.
Any excel sheets out there to calculate flow through parallel pipes? As in, giving the flowrate in, the pipe sizes, lengths, and C values, what are the flow rates through the 2 seperate pipes?
I know there are formulas out there, just wondering if it's already prepackaged into a free excel...
After the footing and basement walls are poured, how long is the typical cure time before the contractor can go ahead and backfill around the walls?
Assume typical home construction practices...
Anyone have any experience in televising water mains? I imagine the line has to be shut down, cut open, and then televised with a sterilized camera... anything else I should know?
I will be installing a sluice or slide gate in a junction chamber where 2 sanitary sewers meet. The 60" and 36" sewer pipes do not continue through into the chamber, they instead end at the walls. So basically, the chamer is a huge empty cube. Recently an 8" thick wall was built frm the floor...
Hello All,
I am making an Access database, where info will be inputed via forms. I want one table,table1, to have only 2 fields, a key field and a date field.
On a seperate form, I am able to pull up a specific record. When I click a certain button, or hit enter on the date field in that...
I want to use a reverse crown profile to drain water from a city owned driving and parking area. This area will be reconstructed and is small enough so that we don't need onsite drainage.
Is it ok to have 2 8ft panels, with a 2% and -2% slope each towards the middle? Will having a joint right...
There exists a 3 ft wide concrete rim around one of our stand pipes. However, this concrete isn't graded very well and there are plenty of ponds due to the concrete sloping TOWARD the stand pipe. In some spots the concrete is broken up with loose exposed stone due to the standing water.
I've...
