Search results for query: *

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 -...

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!

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...

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

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?

Hi Eng's, Is there an older engineer out there who can still handle a waterhammer analysis as described in John Parmakian 1963? I have tried to do the graphical solution starting with using the charts in paragraph 48, page 87-92. I calculated the two necessary parameter for the charts (2*rho...

Could anybody send me a list of symbols being used in Northamerica for generating Process and Instrumentation Diagrams (for wastewater treatment plant). Or could anybody confirm that the symbols are the same like in the european standards? email: cmoch@umagroup.com fax: (250) 475-6388 Thanks...

Hi Eng's, Does anybody know about design standards, guidelines and requirements for on-land fishfarms in Canada or Northamerica at all?

Hi Eng's! Can somebody tell me or give me link to an accepted method of doing a waterhammer analysis by hand? The situation is a sewer forcemain of app. 800m lenght between two liftstations - cont. up-slope. Especially I would like to determine the low-pressure curve over the entire pipe! Is...

Hi Eng's; One of "my" small WWTP is indicating very bad settling conditions in the secondary clarifier (package plant ~ 5 m3/day). The only substrate I have available right now is Al2(SO4)3. The clarifier possesses a volume of app. 2m3. What would be a proper dose to start with? A...

To install a 3/4" tap and hose bibb to a 10" epoxy coated steel pipe (potable watermain) - would you just cut a female thread into the steel pipe and mount on a 3/4" copper pipe? Or are there fittings for that? And any concerns about the damage on the epoxy coat due to thread...

I am dealing with a recurring problem on a pressurized pvc sewer pipe, which breaks due to water hammering on a regular base. The high pressures/subpressures are caused by immediate pump starts/stops between pump and a 90' bend. Anybody experienced in how to solve such problem enduring and...

Hi Eng's, Are there any national (north-american) standards on where or where not to install fire hydrants? Thanks!

Hi Eng's! Just a practical question: on a 10" line with meter and valves I want to use a Flange Adapter (UNIFLANGE) as provision for disassembling the items. So there is a short pipe spool with flanged ends - one flange would be a welding neck flange and one would be a flange adapter. Does...

Hi Eng's: One of some small Sewage Treatment Plants I am responsible for, features a strange performance over the last weeks. It's a small extended airation unit for a Hotel-Lodge. The capacity is enough and it ran well for years. 3 Months ago they had to relocate the unit and for new...

Hi Eng's; Is anybody aware of regulations, which give a number for a horizontal separation between an existing septic field and a proposed water main? Maybe even for western Canada? Thanks!

Hi Eng's; I have to deal with a creek crossing of a proposed water main. The valley to be crossed is about 6m deep and 20 m wide. I am aware of the necessity of air valves at both high points but do I actually need a drain valve at the very low point? Ok, in case of a necessary draining of the...