We have a wastewater combination air valve (CAV) installed on the discharge side of a lift station equipped with submersible pumps. The client would like the outlet of the CAV piped to a sump at the other end of the room. The client's concern is that when the valve releases air it will release...
I have a model of a Septic Tank Effluent Pump (STEP) system. What is the best way to model the septic tank in the flow process? As a storage node? Or is it sufficient to only include a pipe with invert elevations matching the tank inlet and outlet? I'm using SSA as the modeling software. Thanks...
Looking to specify leakage testing of 4" to 12" PVC sanitary sewer lines using low pressure air in accord with ASTM F1417. This standard allows two methods - Constant Pressure Method and Time-Pressure Drop Method.
Which method is more common?
Do contractors have a preference?
Pros and cons of...
AWWA C651 requires minimum 25 ppm at beginning of disinfection and minimum 10 ppm of residual after 24 hours. Is there a maximum limit that should not be exceeded during the disinfection procedure?
What are the options for constructing a central heating and cooling system in a house with a flat roof, no attic and slab on grade foundation? The home is 1400 sq ft with cinder block exterior walls and currently has an evaporative cooler on the roof and gas wall heaters. All ideas are welcome.
I have a question on how to interpret the minimum velocity requirement of 2.0 feet per second for gravity sanitary sewer pipelines. Many regulations indicate that this velocity is measured when the pipe is flowing full. See examples below.
Ten States Standards states:
33.4 Slope
33.41...
I'm working on project in a rural area of NY that has a municipal water supply. I need to determine the needed fire flow to the site and think I can use NPFA 1 to do this. Some suggested using NFPA 1142, but that is for rural or suburban areas where an adequate water supply doesn't exist. Since...
