There are four common methods of expressing the intensity/concentration of odor within a system. These are the Perceptibility Threshold (ATC: Absolute Threshold Concentration), Odor Number (TON: Threshold Odor Number), Maximum Exposure Concentration (TVL: Threshold Limit Value), and Maximum Allowable Concentration (MAC). A description about each can be found below:Perceptibility Threshold (ATC): ATC is the minimum concentration that is detectable by 100% (some cases only up to 50%) of persons participating in a sense of smell …
What are other steps to designing control buildings?
After a floor plan has been proposed and approved, the profile of the control building can be designed. A standard eight foot high building will work for most applications, but there are some components housed within the control building that can change this. For instance, an odor control system can have a chemical feed tank that is 1100 gallons and 8-1/2 feet tall. Most likely this tank is set in the corner and will barely …
How long does it take to manufacture a complete package lift station?
In a standard size and configuration, the complete package lift station with all structural, mechanical, and electrical will be manufactured and delivered in fewer than seven weeks. It typically takes four weeks to manufacture and deliver all of the structural and mechanical components. The pumps and control panel will typically take another two to three weeks.
How does Romtec Utilities suggest lifting a precast concrete wet well into place?
All concrete wet well components are designed to be lifted and set in the excavated hole by use of anchors and ring clutches supplied by Romtec Utilities. The installation contractor will excavate the hole for the wet well, place the base rock as specified by the site engineer, provide a safe OSHA approved cave-in protection method (shoring, and provide a crane of adequate size to lift and set the heaviest piece. The excavation contractor and/or …
How do soft starters compare with variable frequency drives (VFDs)?
Soft starters and VFDs are each used to reduce the in-rush current on the electrical utility during start-up of the pump station and/or electrical generator. They are necessary when the utility has restrictions on the horsepower of the machine being started or if there is a soft utility line that cannot handle the in-rush. Soft starters accomplish this function with basic controls and are much less expensive than VFDs. While more complex and more expensive, …