Newalta, a leading North American resource recovery and environmental services provider, collects, consolidates, and processes industrial waste from across Canada and bordering American states. The company’s Toronto location manages treatment and disposal of non-hazardous industrial waste such as oil and metals-contaminated wastewater, bulk containerised materials and consolidated small-quantity laboratory wastes called ‘lab packs’.
All incoming waste is analysed in a state of the art on-site laboratory, verified to confirm its contents, and then consolidated, processed, recycled, or shipped off site for reuse or disposal, depending on the type of material. Storage of waste oil is a very important part of the recycling process and requires constant level monitoring of intake tanks at all times.
Newalta measures the level of oily water in 19 recycling tanks with three Sitrans LU10s connected to 18 Echomax XPS-30 transducers. The Sitrans LU10 is an ultrasonic non-contacting long range level controller for liquids or solids. It is capable of monitoring up to 10 points of level units in one controller. The Echomax XPS-30 transducer is for long ranges and higher temperatures. Echomax transducers can be fully immersed, are resistant to steam and corrosive chemicals, and can be installed without flanges. During operation, the Echomax transducers emit acoustic pulses in a narrow beam. The level monitor measures the propagation time between pulse emission and its reflection (echo) to calculate the distance.
In 2003 Newalta resolved to find a better way to obtain level readings, so the company installed a graphical HMI to monitor oil levels. The HMI was connected to the Sitrans LU10 controllers via Modbus and it displayed tank levels in a graphical format. This was a significant investment, but at the time it was the most cost-effective solution.
Newalta was pleased with its HMI solution, but in recent years became concerned about the possibility of computer system failures. The company considered upgrading their current system, but this would be expensive and there were numerous risks involved. For example, when the HMI code is upgraded to the new system, the integrator could run into time consuming problems that would add to the expense of the upgrade. The integrator would also have to install new software on the computer, thereby adding yet another risk.
Solution
Advancements in technology over the past eight years have created better options for reporting tank levels. Newalta installed a Sitrans RD500 remote monitor from Siemens to replace its outdated HMI monitoring system, while continuing to use its current instrumentation. This monitor was chosen for its superior networking capabilities and low cost of ownership. It provides remote tank level data via the Web anywhere, anytime and it includes data capturing and event alarming.
Benefits
In the old system, the HMI was located in the laboratory. Therefore, when operators were working on the tanks, they would have to call and get a technician to report the level readings, an inefficient difficult process. With the Sitrans RD500, operators simply log on to view level readings. In addition, this remote monitor logs inventory and usage every hour, which plant managers can easily download anytime from the Web.
Newalta operators have been very impressed with the Sitrans RD500’s ease of use, and the substantial cost savings.
For more information contact Keshin Govender, Siemens Southern Africa, +27 (0)11 652 2412, [email protected], www.siemens.co.za
| Tel: | +27 11 652 2000 |
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