Product category:
Wireless process sensors
News Release from: Emerson Process Management - Wireless | Subject: Smart wireless at Steelworks
Edited by the Processingtalk Editorial
Team on 03 October 2007
Smart Wireless increases steelworks
productivity
The easy-to install self-organizing wireless network from Emerson at Wheeling-Pittsburgh Steel provides new information for operations and maintenance personnel for improving quality and productivity
Wheeling-Pittsburgh Steel Corporation, headquartered in Wheeling, West Virginia, is a major producer of carbon flat rolled products for the construction, container, appliance, converter/processor, steel service center, and automotive markets The easily installed Emerson Smart Wireless solution is successfully delivering previously unattainable data on conditions in the 80-inch hot strip mill in Mingo Junction, Ohio, enabling operating personnel to improve product quality and increase productivity
This article was originally published on Processingtalk on 18 Mar 2008 at 8.00am (UK)
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The Smart Wireless network is operating reliably in both the roughing and finishing sections of the hot strip mill, where transmitters can be installed and operating in just a few hours with very little manpower.
This innovative self-organizing network automatically adapts as device points are added or removed, so installing more transmitters has become common since the initial installation proved to be so effective.
The transmitted signals are received through a single gateway and delivered directly to the Pi data historian for trending and alarming.
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The operators therefore have continuous access to the data which they are using to improve operations and maintenance.
According to Gary Borham, operations manager at Wheeling-Pittsburgh Steel: "We are building an infrastructure that opens up opportunities for more and more applications.
Wireless transmitters are being installed farther and farther away from the gateway without a loss of signal quality.
The result is better information from difficult-to-reach areas of the mill, and this is helping our personnel prevent unscheduled downtime, meet customer quality requirements, and optimise productivity".
Borham said the initial wireless installation included four Rosemount wireless DP flowmeters using Annubar sensors, and one 1420 gateway, that were communicating with oneanother in "less than 24 hours".
The resulting data enabled the operators to get firm control of the volume of water being sprayed onto the hot steel surfaces on the run-out-table in order to achieve specified coiling temperatures.
This wireless system has delivered high returns, supplying flow data to optimise and improve strip cooling and nearly eliminate coiling temperature rejects.
"We previously had no way of knowing how much water was being sprayed over the surface of any given piece of steel traveling down the run-out table," Borham said: "The volume of water applied was determined by look and feel with the adjustment of a manual valve.
Now, the actual water flow is known, making it possible to always attain the optimum coiling temperature.
The guesswork has been taken out of the cooling process and replaced with science".
In another finishing mill application, two Rosemount wireless pressure transmitters are monitoring the run-out-table greasing system, providing an alarm in case of a system failure threatening to starve bearings of lubricant and cause a roller lock-up that could damage steel on the table.
This wireless early warning system makes it possible for maintenance personnel to prevent unscheduled downtime by making system repairs before a bearing seizure can occur.
Plans now call for wireless pressure transmitters on all of their roller greasing systems.
A third wireless application involves the use of two wireless pressure transmitters to monitor the pressure of cooling water supplied to work rolls in the roughing mill.
If the water pressure should drop suddenly, an alarm is raised so action can be taken to prevent roll overheating.
After only one of the wireless pressure transmitters was installed, operators were surprised to see that two pressure devices were showing up on the control system.
The second device was sitting on the floor of the maintenance shop two buildings away, communicating through various concrete walls.
Now, eight more wireless transmitters are on order for this purpose.
Installing conduit and wiring for any of these applications would have been very time-consuming, Borham said.
Clearly, an easy-to-install technology was needed that could handle the steel mill environment while providing information critical to improving operations.
For example, the operators learned very quickly that the actual flow rates of spray water to the run-out-table were totally different to what had been assumed.
As soon as the necessary adjustments were made to the water supply, coil rejections disappeared.
The Emerson Smart Wireless solution is totally compatible with the Emerson PlantWeb digital plant architecture, combining highly reliable, smart monitoring devices with wireless transmitters and the Time Synchronized Mesh Protocol (TSMP) communications technology, extensively tested in real-world environments.
According to Gary Borham, "This is a fantastic solution for us, easy to install, and very easy to expand, if necessary.
In fact, our process engineers are using data provided by our wireless flowmeters in modeling future control schemes, which will enable us to achieve the coiling temperature for heavier gauge products that may be introduced in the future.
Having that information available in advance and being able to control the water spray accordingly will enable us to quickly meet specifications without rejects".
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