I am abandoning about a half mile of existing 4" diameter steel waterline, and the pipe needs to be filled with some sort of non-shrink grout or similar. Since the pipe is only 4" in diameter, I have a few questions:
• What type of material should be specified for the flowable fill, i.e...
In a potable water system, say a 12" watermain, what is the correct way to refer to a short piece of pipe, say between fitting, etc. Pipe spool is something that is made in the factory to a specified length, but I'm talking about something that is likely going to be fabricated / cut in the...
I have a typical manhole with a concrete weir that acts as a flow splitter to separate the water quality flowrate and the high flow bypass. Local Ecology design manuals recommend a minimum headwater to low flow pipe diameter outlet ratio of 2.0. Most culvert design references refer to a HW/d...
On a typical flow splitter manhole with a weir on a drainage system, the water quality flowrate is sent to a pipe connected to a treatment train, and flows in excess of the water quality flowrate are sent through another pipe that acts as a high flow bypass. The low flow pipe for water quality...
We have a situation where we are looking to chemical grout a CMP pipeline that runs partially under a building in order to seal off infiltration leaks at the joints. However, is it possible to chemical grout a CMP pipe with standard packer equipment? Thank you.
During a video inspection, we found a number of laterals connected directly into the mainline storm drain piping. Many of these laterals are leaking, i.e. groundwater intrusion. There looks to be a significant amount of corrosion build-up due tot he leaking pipe at these location at the end of...
I've heard mixed opinions about having a cast-in-place concrete encasement around DIP, say for water systems. I've seen it done many times, but I've heard that some people have concern over the concrete being in direct contact with the DIP. What is the concern, and is it valid? Would a...
I need to provide a shutoff valve in a gravity flow storm drain piping system. Size ranges from 6" to 24". I commonly see gate valves specified on other projects, but I am concerned about their ability to properly seat with the potential for debris to be in the base of the piping. I am...
Local requirements make it necessary to have a shutoff valve just downstream of stormwater treatment devices such as oil/water separators in case there is a spill, etc. What is the best type of shutoff valve for stormwater piping applications for piping 12" and smaller, and for piping larger...
Is it a good idea or bad idea to galvanize both the inside and outside of potable steel water pipe (2-inch size)? I know the galvanizing will over time taint the taste, but I heard the amount of chemical that leaches out into the water is not dangerous. True? Are there any health departments...
I have a storm drainage system that has a flow splitter to some treatment devices. Gate valves are shown on each side of the flow splitter for either spill control or maintenance purposes, i.e. flow to treatment devices can be shut off while performing maintenance. I normally show gate valves...
I need to model a water system where there is a tap off the City distribution network and then I create a separate looping water system network on private property serving fire hydrants building, etc. on a 200 acre site. What software would you suggest for doing this modeling to ensure the size...
