Hi there;
Maybe any sewage onsite disposal system experts out there? What options do you have if 2' of silty clay loam / massive over impervious layer (clay). 3 out of 4 perc tests show infinite perc time. According to the local practice manual this soil is unsuitable for onsite systems -...
to bimr,
I understand the systematic of waterhammer and what to do normally. And I agree that the upslope section of this forcemain can be subject to waterhammer that needs attention. But I was questioning the usage of the mentioned: (cit) "...spring-loaded valve at the end that would close...
hi gordini,
I don't understand the point of the valve in option 3. Why would you want to keep the pipe full at all times? Take option 2 and off you go. Instead of a air release valve you will need a combination air valve to allow air into the pipe after the pumps stop. This will allow draining...
Hi bimr,
I haven't seen the official results yet but the lab said that P would be in the 60 - 70 mg/l. That's a lot but could it cause the following problem: the plant does not build up any biomass - virtually clear of solids although reseeded a few times. pH and DO are ok and the plant used to...
Hi Eng's,
how can an unusual high P level in a treatment plant influent cause harm to the plant's operation? Can high P upset the plant? Which levels are critical for extended aeration plants with no advanced treatment? What's the solution? Pricipitation prior in the equalization tank? Thanks!
Hi out there,
I got a similar but yet different question than a few threads earlier here: I am looking at a proposed sewage forcemain which will convey the wwater about 8 km to the nearest municipal system. To about 4 km down of the pumpstation, the forcemain has a continuous rising grade...
Hi there,
Does anybody know about a table with chlorine concentrations in water (swim pool) and impacts on humans? Normal, max. allowed ... lethal...? Something down that line? Thanks!
won13,
I have recently done a waterhammer study on a 150 mm PVC SDR 26 pipe and its critical negative pressure was -313 kPa. I would assume that a C900 8" is at least this. Good luck!
Hi there!
Quick question: I am designing a water booster pumpstation, using multiple stage axial split centrifugal pumps (due to 500 ft head). How can I determine how close the suction pipes can be situated to each other if coming off a main suction header. Is there a rule of thumb or any fancy...
Pipe jacking:
There are several jacking systems available for smaller pipe sizes which usually utilize some kind of drill head to loosen the ground and a screw to transport the displaced soil to the start excavation. A pressing station in the start excavation pushes the jacking pipes gradually...
Hi Eng's;
Can you guys tell me a bit from your experience when you would prefer which of these two pump types when designing a new water system? Would topography/hydraulic have an impact on the decision?
Does anybody have the ACI 302.1R, 6.4.4 Chapter 7 available and would send it to me? I need that urgently until 13 June for a court case! Thanx a lot!
cmoch@umagroup.com
(250)475-6355
I wouldn't go smaller than 6" in size. Definitely you want to determine the more relevant average daily flow through the pipe and check the velocity at x% full status. This velocity should be min. 2'/sec if you want to avoid sedimentation and potential odour problems.
What number of fecal coliforms can one expect to be dicharged from a activated sludge - sewage treatment plant? Just a common number! Does 200 per 100ml sound alright?
