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So far Edward Marszal has created 93 blog entries.

Another Limitation to Extending Test Intervals

By |2016-08-11T12:48:36+00:00August 11th, 2016|Author, Edward M. Marszal, News, Safety Instrumented System, Services|

A customer noted that some operating companies limit the extension of their test intervals so that the test interval is at least half of the expected demand rate.  For instance, if a safety instrumented function (SIF) is intended to prevent against a hazard whose initiating event rate is once in ten years, then the test interval [...]

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Low O2 / High Combustibles Heater Shutdown

By |2017-06-25T19:58:09+00:00August 5th, 2016|Author, Edward M. Marszal, News, Safety Instrumented System, Services|

I received this customer question that is common enough that I thought that I would publish the answer in a blog... >> Have you seen others in the petrochemical industry using analytical measurements (combustibles, CO, O2) of flue gas to shut down fired heaters? Yes >> Many of our PHAs are identifying unburned fuel in [...]

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Unavailability Simplified Equation Derivation

By |2017-06-25T19:58:09+00:00July 22nd, 2016|Author, Edward M. Marszal, Safety Instrumented System, Vertigo|

The process of safety integrity level (SIL) verification requires calculation of probability of failure on demand.  As per convention and the information contained in the IEC 61511 standard (ISA 84.00.01), ISA technical reports on the topic and ISA training, the calculation is typically done using simplified equations.  The terms of these equations are either based [...]

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China University of Petroleum Licenses Effigy and Vertigo

By |2017-06-25T19:58:09+00:00June 13th, 2016|Author, Edward M. Marszal, Effigy, News, Training, Vertigo|

The China University of Petroleum and Kenexis has signed licensing agreements that will allow the university to utilize Kenexis software and Kenexis training materials in the gradudate and undergraduate curricula for the Department of Safety Science and Engineering of the College of Mechanical Engineering.  In keeping with Kenexis' policy of giving back to the engineering [...]

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Kenexis President Ed Marszal to Speak at 4th China CCPS Conference

By |2017-06-25T19:58:09+00:00May 24th, 2016|Author, Edward M. Marszal, News|

Kenexis President and CEO Ed Marszal will be providing a keynote presentation at the 4th China Center for Chemical Process Safety Conference in Qingdao China, Thursday June 2.  Mr. Marszal will be presented a lecture entitled "Gas Detector Coverage Calculation Using Gaussian Dispersion Models".  This presentation will focus on the use of scenario coverage for [...]

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Comparing Safety Instrumented Systems and Machine Safeguarding

By |2017-06-25T19:58:09+00:00February 2nd, 2016|Author, Edward M. Marszal, Safety Instrumented System, Services|

Industry has applied instrumentation and control devices for the purpose of safeguarding people, equipment, and business for almost as long as instrumentation and control has been used - that is machine safeguarding and safety instrumented systems. In the “wet” process industries these devices and systems have been employed to detect out of control conditions in [...]

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FGS Mapping Video Featuring Effigy Released by Kenexis

By |2017-06-25T19:58:09+00:00January 18th, 2016|Author, Edward M. Marszal, Effigy, Fire and Gas Systems, Products, Services|

FGS Mapping, specifically using the Kenexis Effigy FGS Mapping software application is the topic of a new video released by Kenexis.  The video, which runs about four and a half minutes, provides a great overview of the process of fire and gas mapping in general and also provides an detailed explanation of how the Kenexis [...]

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Tight Shutoff Requirements in SRS

By |2017-08-08T09:14:22+00:00November 24th, 2015|Edward M. Marszal, Safety Instrumented System|

The IEC 61511 standard requires that the need for tight shutoff be specified in the safety requirements specifications. Section 10.3 SIS safety requirements states, 10.3.1 These requirements shall be sufficient to design the SIS and include  the following: ... A description of the SIS process output actions and the criteria for successful operation, for example, tight [...]

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See Kenexis at the ISA Conference in Abu Dhabi!

By |2017-06-25T19:58:13+00:00May 14th, 2015|Edward M. Marszal, News|

Kenexis will be attending the 2015 ISA Automation Conference in Abu Dhabi.  The conference will be held at the St. Regis on Saadiyat Island.  More details can be found in the brochure linked below or at the conference web site (www.isa-emea-expo.org).  As you would expect, our Region Manager, Srini Ganesan will be attending, but the [...]

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What ISO-9001 Certification Means to Kenexis

By |2017-06-25T19:58:13+00:00May 11th, 2015|Edward M. Marszal, News|

From our inception, Kenexis has always strived to provide the highest quality services and products.  We have always operated in a way that our services are systematic, repeatable, and well documented.  While we have always operated this way, you no longer have to take our word for it because we have received an independent third [...]

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Documenting Environmental Extremes in Safety Requirements Specifications

By |2017-06-25T19:58:13+00:00April 24th, 2015|Edward M. Marszal, Safety Instrumented System, Vertigo|

The IEC 61511 standard requires that the user specify extremes of environmental conditions as part of the safety requirements specifications package. This requirement is actually not a safety requirement but a general requirement for operation of all instrumentation and control devices, but its inclusion in the list of safety requirements specifications implies that the associated [...]

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Getting Started with Vertigo

By |2017-06-25T19:58:13+00:00April 3rd, 2015|Edward M. Marszal, Vertigo|

This article presents a quick introduction and overview to the Kenexis Vertigo software for SIS Design Basis Development.  Vertigo is a module in the Kenexis Instrumented Safeguard Suite (KISS) of Application.  KISS is a multi-user multi-site internet enabled enterprise software application, provided in the Software-as-a-Service (SaaS) format. During this getting started tutorial, Ed Marszal, the [...]

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Gas Detection in Boiler Rooms

By |2017-06-25T19:58:13+00:00December 19th, 2014|Author, Edward M. Marszal, Fire and Gas Systems|

A lot of companies that operate gas-fired boilers are in the process of considering and installing gas detection systems to protect their plants.  In the United States, and many other countries, the design of boilers is in accordance with National Fire Protection Agency (NFPA) Standard 85 - Boiler and Combustion Systems Hazards Code.    This standard [...]

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What’s in the new version of IEC 61511? Issue 3

By |2014-11-21T14:05:10+00:00November 21st, 2014|News|

Continuing in definitions... The definition for common cause failure was greatly cleaned up... The original definition was: failure, which is the result of one or more events, causing failures of two or more separate channels in a multiple channel system. The new definition is: concurrent failures of different devices, resulting from a single event, where [...]

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Make Process Plants Inherently Safe Against Cyber Attack

By |2017-06-25T19:58:13+00:00November 8th, 2014|Author, Edward M. Marszal|

Warning...  This is going to be a long blog post with a lot of large bits of reference material to go through.  Please bear with me as the message is quite important. For years, industry pundits have been warning about the massive physical damage and loss of life that can occur as the results of [...]

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What’s in the New Version of IEC 61511? Issue 2

By |2017-06-25T19:58:13+00:00October 31st, 2014|Author, Edward M. Marszal|

Moving on to the definitions... Definition 3.2.3 for basic process control systems was changed slightly.  Let's look at the change... Original: ... but which does not perform any safety instrumented functions with a claimed SIL >= 1. CDV: ... but which does not perform any SIF. Hmm.  The original states that a BPCS does not [...]

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What’s in the New Version of IEC 61511? Issue 1

By |2017-06-25T19:58:14+00:00October 30th, 2014|Author, Edward M. Marszal|

As many of you are already aware, IEC is in the process of updating the IEC 61511 standard.  It is actually quite late in doing so, but work is now progressing.  Through my committee work, I have a copy of a recent committee draft for vote (CDV) that I have been reviewing extensively.  This document [...]

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Fuel Rich Firebox Explosions

By |2017-06-25T19:58:14+00:00September 23rd, 2014|Edward M. Marszal|

I was recently asked by a customer whether or not an explosion as the result of a fuel rich firebox in a fired heater was a credible hazard that they should be designing their heaters to address.  The customer is spending a lot of money on stack gas analyzers and the associated maintenance and testing [...]

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Understanding Fire Sizes in FGS Mapping

By |2017-06-25T19:58:14+00:00September 10th, 2014|Edward M. Marszal|

Good fire and gas (FGS) mapping depends on a solid understanding of the performance attributes of the fire detection equipment that is being assessed along with a knowledge of the characteristics of the type and size of fire that is being detected.  The starting point for quantifying the effectiveness of a fire detector is to [...]

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SIS Test Intervals – Know the Facts Before Changing Published in ISS Source

By |2014-10-07T10:28:09+00:00August 22nd, 2014|News|

SIS Test Intervals - Know the Facts Before Changing , an article written by Kenexis President Ed Marszal, was published by ISS Source.  This article discusses how the failure rates that are utilized in SIL verification calculations are often based on the test intervals that are used at a facility and industry in general.  Simply using [...]

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Cyber Attack Proof Safeguards

By |2014-10-07T10:29:14+00:00August 22nd, 2014|News|

There are dozens of ways to overpressure a distillation column... You can increase the heat input, drop out the cooling, flood the column with liquid, and on and on.  Yet, well designed distillation columns are almost never equipped with any safety instrumented functions that protect against overpressure, and are almost never over-pressured.  Given the ubiquitous [...]

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Explanation of Mitigation Effectiveness

By |2017-06-25T19:58:14+00:00March 14th, 2014|Author, Edward M. Marszal|

Since the release of the ISA 84.00.07 technical report, I’ve received a lot of enquiries regarding mitigation effectiveness.  A lot of the questions were framed in terms of “what number do I use for mitigation effectiveness?”, which shows that we the technical report working group did not do a good job in defining the concept.  [...]

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FGS Functions that can be Treated as SIF

By |2017-06-25T19:58:14+00:00March 12th, 2014|Author, Edward M. Marszal|

As I am currently preparing material for a revision of the ISATR 84.00.07 technical report, I will try to share with my readers some of the issues that users of the technical report have requested be included in an update to the TR. When I last attended an IEC 60079 committee meeting, the members of [...]

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Accuracy of SIL Calculations

By |2017-06-25T19:58:14+00:00March 7th, 2014|Author, Edward M. Marszal|

During the recent ISA 84 committee meetings related to the ISA TR84.00.02 which discusses SIL verification calculations I was made aware of an effort to attempt to quantify the amount of error in SIL calculations.  The objective of this effort was to determine how much of a margin of error should be placed in the [...]

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Kenexis Presenting at the 2014 ISA Safety Division Symposium

By |2017-06-25T19:58:14+00:00January 29th, 2014|News|

Kenexis has accepted an invitation to present at the 2014 ISA Safety Division Symposium being held at the Marriott West Loop in Houston Texas, October 6-9, 2014. Kenexis President, Ed Marszal is expected to attend and give a workshop on the ISA 84.00.07 technical report which will include a live example to be worked by [...]

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