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...
Thanks for you responses cvg. Follow-up question...if the orifice is controlling flow to the outlet, but the orifice is submerged, would the hydraulic head be the difference between the top of weir and the water level in the outlet pipe (water level in outlet pipe is a result of the flow...
Yes, top of weir, but measured to what when the low flow outlet is a turned down elbow with an orifice plate on the bottom of the elbow? Is it measured from the top of weir to the bottom of the turned down elbow where the horizontal orifice plate is located, or to the invert of the pipe outlet...
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...
Looking into this a bit more it looks like a knife gate valve might be the way to go; however, all I can only seem to find them with handwheels. Do they make knife gate valves with a 2-inch operating nut for flush mounted valve box applications in traffic areas?
Also, it seems pinch valves...
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...
Putting FRP, PVC or HDPE under a pier subject to extreme high tides and likely contact with floating debris at times would not be wise in my opinion. Ductile iron and/or steel is needed for it's durability to withstand abuse in this type of environment, as long as it's properly protected...
Thank you all for the feedback. I found out that in 1986, the first galvanized pipe manufacturer was certified to ANSI/NSF Standard 61 for its hop dip galvanized pipe for potable use. Since then, galvanizers have had their material and processes evaluated in accordance with ANSI/NSF-61 with...
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...
