Edward M. Marszal

//Edward M. Marszal

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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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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Can I Increase SIS Test Intervals to Seven Years?

By |2017-06-25T19:58:14+00:00May 6th, 2014|Author, Edward M. Marszal|

I recently received a question from an operating company engineer. He was asked to confirm that the safety instrumented systems were suitable for increasing the test interval up to seven years from a current figure of five years. Even though he believed that the calculations would show that the increased test interval was acceptable, he [...]

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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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Are Separate Taps Making Your Plant LESS Safe?

By |2017-06-25T19:58:14+00:00November 10th, 2013|Author, Edward M. Marszal|

Instrumentation and control engineers have been taught, no, conditioned through repetition, to design separate taps for each instrument that is associated with a safety instrumented function. The core idea is to minimize the probability of a common cause failure that will cause multiple and otherwise independent portions of a safety instrumented function from failing at [...]

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Wireless for SIS?

By |2017-06-25T19:58:14+00:00November 5th, 2013|Author, Edward M. Marszal|

I recently received a request from a colleague asking for more information regarding the position of the ISA 84 committee on the use of wireless in SIS applications.  He had heard that the “rules” preventing the use of wireless in SIS had been relaxed.  This is my reply… There are no changes in stance of [...]

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OSHA Review Panel Ruling on Application of API 556

By |2017-06-25T19:58:14+00:00August 8th, 2013|Author, Edward M. Marszal|

Many SIS practitioners are concerned about how government and regulators interpret the implementation of codes and standards that are relevant to their industries. Concrete guidance is rarely given beyond what is strictly written in the regulations (e.g., 29 CFR 1910.119) and occasional letters of interpretation. OSHA Citations offer some insight, but are not reliable information [...]

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Credit for Operator Response to SIS Failure

By |2017-06-25T19:58:14+00:00March 30th, 2013|Author, Edward M. Marszal|

Even though I have been doing SIS design for about 20 years now, I never seem to run out of new and interesting problems and questions to ponder.  Of course, this is probably a function of the fact that I am a consultant who is continually exposed to different processes and usually only get involved [...]

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How Many Alarm IPL Can I Credit?

By |2017-06-25T19:58:14+00:00March 18th, 2013|Author, Edward M. Marszal|

I recently received an enquiry from a customer.  He asked if I know of any technical resource that specifies a limitation on the number of alarms that can be considered as an IPL.  The rationale being that there comes a point where an operator is exposed to so many IPL alarms that he will not [...]

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I Think I Might Have Too Many Fire Detectors…

By |2014-11-06T16:14:05+00:00February 8th, 2013|Author, Edward M. Marszal|

In my consulting I often hear engineers say, “I think I have too many detectors”.  They use their prescriptive rules, other rules of thumb, and basic engineering judgment to perform an initial layout and when the design is complete they look at the thousand or so detectors they’ve placed and determine that it just doesn’t [...]

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Applicability of NFPA 72 to Process Areas

By |2017-06-25T19:58:14+00:00January 15th, 2013|Author, Edward M. Marszal|

I received the following questions about design of fire and gas detection and suppression systems in process industry applications from a client. After answering I figured that I would share the information, as these questions are quite frequently asked. (1)    Is the NFPA 72 a fire standard/guideline applicable to “only buildings’ ? Does any certifying [...]

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Partial Stroke Test Coverage Assignment Recommendations

By |2017-06-25T19:58:15+00:00December 7th, 2012|Author, Edward M. Marszal|

During the process of SIL verification calculations, analysts are often required to assess the effectiveness of performing partial stroke testing.  Partial stroke testing is a type of diagnostic.  Diagnostics have a beneficial effect on the failure probability of a component because if a failure occurs, it can be rapidly detected and repaired, leaving the component [...]

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