Archive for category Safety Control

Honeywell Increases Analog/Loop Processing Speed on HC900 Process and Safety Controller

Written by: Dan Weise

Good news!  Recent upgrades to Honeywell’s HC900 Process and Safety Controller includes a major update to analog/loop processing speeds. Even though analog/loop cycle time has been 500mS since the early 2000s, early versions of the HC900 controller were only capable of a processing speed of 2x/second.

The upgrade to the HC900 CPU’s microprocessor hardware and an associated firmware update broke that processing speed limit for their SIL-rated CPUs. Honeywell C50S and C70S model CPUs v6.1 will now process analog inputs and loops at a rate of 10x/second (100mS per update). If your process needs additional analog/loop throughput speed, you will benefit from these enhancements to the HC900 systems.

To run at 100mS, a qualified hardware configuration is required:

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Video: Troubleshooting a Maxon Shutoff Valve

We understand the inconvenience that comes with having to send an instrument out for repair, so at Lesman we try to help you determine what’s wrong with your device before you remove it from service. After all, we don’t want you to lose any uptime if it’s something that can be fixed in the field.

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Combustion control systems go modular with Honeywell Slate

A typical combustion system is complex to say the least.  It is usually made up of various devices from multiple vendors that have to be combined and connected in order for the system to work.  These systems are not typically flexible and are hard to change once the system has been set up.

Honeywell has come up with a completely new system that provides limitless flexibility with fewer components.  This product has been designed as a fresh start for the combustion industry or in Honeywell’s words, “It’s time to wipe the SLATE clean.”

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Five Key Features Required for a Perfect Fit Distributed Control System

If you work in the industrial sector, you understand the never-ending push to increase uptime and improve reliability at your plant. Today’s processes require faster and more accurate engineering. Because of this, most companies are looking for ways to boost operational effectiveness and increase maintenance efficiency at their plants.

A distributed control system (DCS) is a control system where control elements are distributed throughout the system, as opposed to using a single controller at a central location. But how do you choose the right DCS? And how do you decide what functions are critical to your process?Functional_levels_of_a_Distributed_Control_System.svg

Honeywell recently released a white paper that discusses five key features for a perfect fit DCS if you’re thinking about implementing one at your plant.

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Troubleshooting Maxon Shutoff Valves by Sound

Written by: A.J. Piskor

One of the key pieces of any combustion system are the safety shutoff valves. Their job is important, stop the fuel from entering the system when requested or when a fault is detected. With the harsh operating environments and demanding cycling that these valves sometimes go through, internal components have been known to fail. Not only does this bring the shutoff valve down (to a safe position), but it also brings down the combustion system with it.

Maxon shutoff valves are known for their performance, reliability, and durability. In the rare case that one of their automatic reset gas valves (Series 5000/SMA11 or 5000CP/CMA11 for normally closed models, series STOA/SMA21 or STOACP/CMA21 for normally open models) fails to perform, it’s possible that one of the internal components could have gone bad. Each Maxon automatic reset shutoff valve comes with three critical electrical components (solenoid, motor, position switch) that need to work together for the valve to operate properly. By listening to the valve cycle to its energized state, you can detect if any of these critical electrical components needs to be replaced.

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Is it time to switch switches?

Eight problems with outdated, electromechanical switches and eight solutions that will come with a digital upgrade to your plant.

Operational VisibilityUE Electric Safety Transmitter

The Problem: Unless tested on a regular basis, there is no way to determine when a problem exists. With mechanical switches, the only way to diagnose a problem is to remove the switch, leaving the control or safety function
unprotected.

Solution: Newer digital switches have an LCD screen that shows local process variable measurements and integrated internal diagnostics directly on the screen. You can easily monitor the health of the device at a glance, without having to remove the switch from operation.

Adjustability

The Problem: Mechanical switches require careful adjustments for reaching desired setpoints. Additionally, once these adjustments are made, settings

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Automatic Overfill Prevention System- Learning from the CAPECO incident

We all know tank farms play a crucial role in any terminal or refinery, yet they are among the most neglected areas of automation in most facilities.

Improperly managed tank farms present a number of hazards for employees, physical assets, and the environment. Tank farms, storage areas, and loading/unloading sites all require continual monitoring of critical process parameters.

Many tank farm accidents have been traced to ineffective use of technology leading to loss of level control and eventually, overfill.  Overfill in a hazardous environment has taken lives and leaves widespread damage to the surrounding community.

CAEPCO Incident

Earlier this summer, the U.S. Chemical Safety Board issued their investigation report regarding the CAPECO petroleum terminal facility explosion in 2009, pinpointing “inadequate management of gasoline storage tank overfill hazards”.

Safe tank farm management is becoming increasingly more challenging: Off-site piping grows more complex and operator workload becomes more demanding. At the same time, we are seeing a continuing drive for higher efficiency across the industry.

Honeywell has just released a whitepaper on implementing overfill prevention systems. Download the white paper here: http://hwll.co/spta

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