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Posts Tagged ‘IEC 61511’

Remote Proof Testing Safety Level Switches

Posted in Level, Safety on Monday, April 22nd, 2019. No comments yet
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One of the necessities in managing safety instrumented systems throughout the IEC 61511 safety lifecycle is to perform periodic proof tests on the components in a safety instrumented function to verify proper function. A short 2:44 YouTube video, How to Remotely Proof-Test the Rosemount 2140:SIS shows how this proof testing can be performed remotely for […]

Simplifying Safety Valve Proof Testing

Posted in Safety on Wednesday, December 19th, 2018. No comments yet
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A safety instrumented function (SIF) within a safety instrumented system (SIS) consists of a sensor, logic solver, and final element. As part of the IEC 61511 global safety standard, these elements within the SIF must be tested during the operational phase of the safety lifecycle. Of the 3 elements, the final control element, typically a […]

Partial Stroke Test for Final Elements—Diagnostic Coverage Factors

Posted in Final Control Element, Safety on Thursday, December 13th, 2018. No comments yet
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Author: Riyaz Ali Partial stroke test is one of the viable means to check mechanical integrity of Final Element of Safety Instrumented Function (SIF) loop. Generally, end users struggle on question of credit of PST for improvement in SIL (Safety Integrity Level). IEC 61508 and IEC 61511 define diagnostic coverage factors (DCF), but do not […]

Flame and Gas Detection in Layers of Protection

Posted in Analyzers, Safety on Friday, June 8th, 2018. No comments yet
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For manufacturing processes with hazardous substances that are combustible or can cause harm to people and property, flame and gas detection systems are often used as part of the risk mitigation strategy. This 11-minute video, Rosemount Flame and Gas Layers of Protection describes how these sensors are used in layers of protection for the process […]

Managing Storage Tank Pressure and Overfill Prevention

Posted in Safety on Friday, May 25th, 2018. No comments yet
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Across the energy supply chain bulk petroleum storage terminals play an important role in managing supply and demand. A critical safety function is to prevent an overfill condition in each of the storage tanks. Another critical function is to manage the pressure inside the tank to avoid overpressure or vacuum conditions that could damage the […]