Safety Instrumented Systems

PHA, LOPA, and QRA

Fire and Gas Systems

Industrial Cyber Security

edward.marszal@kenexis.com

/Edward Marszal

About Edward Marszal

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So far Edward Marszal has created 81 blog entries.

Kenexis Presents SIS Safety Lifecycle Seminar in Beijing

By | January 24th, 2017|News|

Kenexis President and CEO, Ed Marszal, presented a training seminar in Beijing, China.  The seminar occurred during the week of January 16th.  The seminar was sponsored and arranged by the China Chemical Safety Association (CCSA). Kenexis is particularly indebted to the work of CCSA Secretary General and SAWS Chairman Mr. Lu, for arranging this event.  [...]

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Design of SIS Bypasses

By | December 6th, 2016|Author, Edward M. Marszal, Safety Instrumented System, Services|

The mechanism for the bypass needs to meet the requirements of the IEC 61511 (ISA 84) standard.  The relevant sections from the 2016 version of IEC 61511 are as follows: 11.7.2.1  Where the SIS operator interface is via the BPCS operator interface, account shall be taken of credible failures that may occur in the BPCS [...]

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Security PHA Review (SPR) and Security Levels

By | December 6th, 2016|Author, Edward M. Marszal, SCADA Security, Services|

After reading an ISA article related to the application of Security PHA Review (SPR) for the determination of required security levels for Industrial Control Systems (ICS), as required in IEC 62443 [ISA 99], a Kenexis customer had some questions related to whether or not some cyber safeguarding measures make a scenario "non-hackable", and if not, what [...]

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Determining Shutoff Valve Leak Tightness Requirements

By | October 5th, 2016|Author, Edward M. Marszal, News, Safety Instrumented System, Services|

A prior blog on the Kenexis web site related to the requirements for tight-shutoff (TSO) for valves that are part of a safety instrumented function generated a lot of interest in the engineering community.  A link to that blog is shown below. Tight Shutoff Requirements in SRS Blog After writing that blog, Kenexis routinely received [...]

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Benefit of Plume Fire Modeling over Point Models/Ray Tracing

By | October 5th, 2016|Author, Edward M. Marszal, Effigy, Fire and Gas Systems|

Most process plant engineering includes the development of 3D models that define the facility and help engineers to visualize the plant while it is still on the "drawing board", allowing for optimization of design.  These models are also a key part of determining the number of fire detectors that are required and where they should [...]

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Meet NORSOK Fire Detection Mapping Requirements with Kenexis Effigy

By | September 22nd, 2016|Author, Edward M. Marszal, Effigy, Fire and Gas Systems, Products, Services|

Companies that are participating in oil and gas production on the Norwegian Continental Shelf know that they are required to meet the NORSOK standards.  There is a NORSOK standard that is cutting edge (in comparison to other legislative body guidance in the field of instrumented safeguards), and that standard is NORSOK S-001 Technical Safety.  Section [...]

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Benefit of Scenario Coverage for Fire and Gas Mapping

By | September 19th, 2016|Edward M. Marszal, Effigy, Fire and Gas Systems|

More and more fire and gas professionals are asking about the benefit of using scenario coverage over geographic coverage.  They see that the amount of effort required to perform a scenario coverage mapping project is significantly increased so they desire to see evidence that the additional effort is worth it.  Well, it is worth the [...]

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Kenexis Speaks at China Chemical Safety Association 5th Workshop on Risk Control

By | September 14th, 2016|Author, Edward M. Marszal, News|

Kenexis has accepted an invitation to speak at the China Chemical Safety Association 5th Workshop on Risk Control and Hidden Danger Management of the Chemical Industry.  The speaker will be President and CEO, Ed Marszal.  Mr. Marszal will be presenting, "A History of LOPA".  This presentation will give a personal perspective of how the LOPA [...]

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New Model RFQ for Fire and Gas Mapping

By | September 12th, 2016|Edward M. Marszal, Fire and Gas Systems, Services|

Kenexis has just refreshed our Model RFQ document for fire and gas mapping.  It has been updated to show all of the advancements in FGS mapping technology, and it has also been streamlined to show the most popular workflows for a FGS mapping project.  For those of you who don't know, Kenexis has a lot [...]

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Sizing Graded Areas for FGS Mapping

By | August 30th, 2016|Author, Edward M. Marszal, Effigy, Fire and Gas Systems, News, Products, Services|

When performing fire and gas mapping utilizing geographic coverage techniques, one needs to define the extents of the area of concern.  This process allows the analyst to define the actual area that must be covered by the fire detectors or the gas detectors.  This is only important for geographic coverage methods because geographic methods do [...]

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Fire Detector Viewing Distance Attenuation Factors

By | August 29th, 2016|Author, Edward M. Marszal, Effigy, Fire and Gas Systems, Products, Services|

The performance of optical fire detectors is generally defined by the test results that equipment vendors perform utilizing the FM 3260 test specification.  FM 3260 testing provides a set of results, that when graphically presented is often referred to as the "cone of vision" of the detector.  A typical cone of vision drawing for an [...]

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Gas Detector Scenario Coverage Using Gaussian Dispersion Models

By | August 29th, 2016|Author, Edward M. Marszal, Effigy, Fire and Gas Systems, News, Products, Services|

In the past few years, the use of quantitative risk analysis tools to determine the required number of location of gas detectors has gotten more attention in the literature and also in real world project execution.  While there is great interest in these performance based methods, often referred to as fire and gas mapping, there [...]

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Effigy Can Perform FGS Mapping in 2D, But Why?

By | August 19th, 2016|Author, Edward M. Marszal, Effigy, Fire and Gas Systems, News, Products, Services|

There have been times when customers have asked whether or not our Effigy fire and gas mapping software is capable of modeling in 2D instead of 3D.  The rationale for the request is that the customer does not have 3D models for their facility, but would still like to have an analysis performed.  All of the [...]

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Another Limitation to Extending Test Intervals

By | August 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 | August 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 | July 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 | June 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 | May 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 | February 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 | January 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 | November 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, [...]

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See Kenexis at the ISA Conference in Abu Dhabi!

By | May 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 | May 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 | April 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 | April 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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