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  1. CivEnvEng98

    Force Main Clean outs

    In my part of the world, cleanouts are for gravity systems but PIGGING STATIONS are for pressure mains. Having the ability to pig a force main (and even water mains) is pretty important and most utility engineers reviewing your plans don't ask for them and frankly miss out on their importance...
  2. CivEnvEng98

    cleanout vs manhole?

    I'll give my $0.02 in cleanouts & bends... With sewer laterals/services (i.e., 6" and smaller) I do not design 90-bends. I use two consecutive 45-degree bends. Some Utilities won't allow 90-degree bends anyway and they also require a cleanout extended behind each bend, some leave that up to...
  3. CivEnvEng98

    Langelier Index

    CCPP (Calcium Carbonate Precipitation Potential) measures the amount of supersaturation (mg/L) of CaCO3. You'll need a specific Caldwell-Lawrence diagram (depending on TDS and temperature) or a desktop software to figure it out the saturation concentration of CaCO3 for your specific water...
  4. CivEnvEng98

    Choosing Graduate Schools

    One last thing, ABET accredits more than just engineering and applied sciences: Engineering Applied Sciences Computing Technology
  5. CivEnvEng98

    Choosing Graduate Schools

    Edit previous post about the Air Force Institute: All their ABET accredited programs are MS degrees which includes Environmental. Sorry, I didn't write that correctly :)
  6. CivEnvEng98

    Choosing Graduate Schools

    Some misconceptions regarding what programs can and cannot recieve ABET accreditation need to be clarified. First, ABET does have an option for schools to accredit post graduate programs, though very few schools choose to do so since ABET only accredits either the graduate or postgraduate...
  7. CivEnvEng98

    ALT Item for Pinch-type checkvalve

    Our firm evaluated something quite similar for a fire station. These fire trucks are usually kept in a state of cleanliness like it's nobody's business, so there is ALOT of oily wash water. Plus, in some cases the fire dept has Hazardous Waste response vehicles so whatever is washed off can't...
  8. CivEnvEng98

    Dipping Manholes

    In some areas that are pretty flat, say Florida, a 1/10 of a foot error in a short sewer run can be the difference between a Utility accepting the sewer system or not...I've seen it happen. The rodman is SUPPOSED to measure the rod angle for every measurement. Also, there is a fitting you can...
  9. CivEnvEng98

    Stainless Steel Corrosion

    The steel isn't even blushed.....that's not your problem. Whatever the lubricant and/or sealant that was used on the bolts/flange holes is what has the rust appearance. Whatever it is, sure hope is was NSF approved.
  10. CivEnvEng98

    Whet happened when you became a PE? Promotion? Raise?

    I have a couple of comments: Your company's multiplier is a 3.4??? Ouch. I have been through two Zweig White "consulting" events at 2 separate civil firms and according to them a 3.4 is considered very, very high. That hurt's your max. possibly salary under your billing rate. It's a little...
  11. CivEnvEng98

    Whet happened when you became a PE? Promotion? Raise?

    The private sector can range wildly. I have seen from 7% all the way up to 20% once a colleage obtained his/her PE license. It really depends on several factors such as company policy, your new billing rate and your company's multiplier which affects your max annual salary vs what you bill out...
  12. CivEnvEng98

    PE Exam Flunkie

    Okie, how close were you from passing the water resources tests? 5 pts? 20 pts? If you were 5 to 7 pts or less from passing I would go back and take the water resources portion again. I would make sure and spend plenty of time tabbing your books for key formulas/concepts. Keep taking the...
  13. CivEnvEng98

    Maximum force main velocity reference

    I'm with bimr. Good pipe economics dictates FM velocities of 3 to 5 feet/sec.
  14. CivEnvEng98

    DIP vs PVC for 36" FM

    I'll add my $0.02. No offense Richard, but I would be skeptical to hang large diameter HDPE for any type of job. I have no experience doing that and it just seems like the wrong application to me. Stainless steel would be wonderful but to me it is so expensive compared to PVC and DIP and it...
  15. CivEnvEng98

    Forcemain Surges at Effluent Point

    I'd like to know what the pump pressure gages read during static conditions and when one and/or both of the pumps kick on. Could you give that info?
  16. CivEnvEng98

    Can an Air Release Vent be relocated?

    It really depends... If the apparant high spot is a really big one, like 100' long and you can move the ARV to that side of it, no problem. You need to get a hold of the as-builts/record drawings on the line and see what you're up against. Moving the ARV away from the high spot can minimize...
  17. CivEnvEng98

    sludge weight (lb/ft3)

    RYANTD, I recommend you take a close look at "Lime Post-Treatment" section in Metcalf & Eddy before going further. If you use quicklime (which is discussed in this chapter)I bet you'll be dosing in the range of 0.6 to 0.9 lb CaO per lb of 30% sludge. Best of Luck!
  18. CivEnvEng98

    Peaking factor

    OK if converting the flowrates to account for hours of operation is really the peak hourly flow, then how do you determine the average daily flow?
  19. CivEnvEng98

    Hydrant Flow Test

    Find a way to loop your system. I don't mean back to the 12" dead end, but where the 12" branched off of the main system.
  20. CivEnvEng98

    DIP vs. HDPE?

    I could be wrong, but I thought there were no manufacturers that made DIP in anything under 4".

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