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Handling changes to process applications is never particularly easy, but when safety gets involved, it's a whole other ball game. Properly managing all the needs, variables and requirements inherent in altering any process safety system takes a calm, logical and almost obsessively methodical and well-documented approach. This is needed to overcome the uncertainties and potential dangers that can arise when high-stakes applications are maintained, repaired, updated or replaced.
"Hazards involve equipment failures, human errors, unforeseen chemical reactions or any situation that increases operating risk, such as potential deficiencies in safety management systems. Hazards can be introduced when change occurs, when modifications to a facility's operation are made, or when replacement equipment doesn't meet the design criteria of equipment being replaced," said Ulric Roy, Invensys Operations Management's lead engineer for Triconex safety systems, at a presentation this week at the Invensys North America Client Conference in Houston. "Other changes occur when operating procedures are modified, site staffing changes, or a company reorganizes. Changes that aren't carefully controlled increase operating risk and can directly cause or lead to catastrophic events."
To help eliminate or mitigate these risks, make sure new hazards aren't introduced and ensure that human and environmental safety aren't compromised, Roy said. "Consistent and effective management of change (MOC) is the most important element of the process safety management (PSM) program. It's the most difficult activity to implement, and it requires solid dedication from highly experienced resources and rigorous management commitment."Roy added that maturation of MOC programs in industry has been very slow, but today there is more support that inspires confidence. "For the past 20 years, most of the initial chemical industry MOC implementation activity has been driven by regulatory influence," said Roy. "Since 1989, a lot of industry experience and guidelines have been developed, and computer technology has helped garner acceptance of new tools, like the risk-based process safety (RBPS) system approach. However, the crucial element is reliable performance. Your MOC process should be flexible and aim for ways to continuously improve."
Roy explained that a MOC process is an organized, systematic effort that includes administrative procedures for the review and approval of changes before they are implemented. "Your PSM program shall define the MOC elements in detail. You define where the MOC process applies—the physical areas of the facilities, such as fence-to-fence, the phases of the process life cycle and the source of changes, such as hardware, software, procedures, personnel or organization," he said. "A MOC process should be designed to fit your organizational structure, culture and workforce, and it should be revised periodically to ensure adaptability."
However, Roy cautioned that a MOC process that is circumvented or used in a parallel environment with no widespread acceptance and commitment is worse than having no MOC process. "An effective MOC process demands a significant commitment from line management, departmental support organizations and employees," said Roy. "Success begins at the top, when management demonstrates leadership and commitment by making sometimes-hard decisions in favor of safety."
To manage risk by eliminating it, Roy described MOC's main goals as:
To accomplish these goals, Roy added that users must manage a variety of types of changes in their process applications. These types include changes to process equipment, process controls, safety systems, site infrastructure, operations and technology, preventive inspection maintenance, procedures and staffing. Likewise, they also must use MOC in each life-cycle phase of their equipment, application or facility. These phases include R&D, conceptual, design, detailed engineering design, procurement and construction, start-up (atypical operation), normal operation (typical operation), maintenance and turnaround, extended shutdown (atypical operation) and decommissioning.
"MOC is not a form. It's a process," said Roy. The seven steps in the MOC process include:
"The MOC process is the gatekeeper—a trackable sign-on/sign-off sheet—of most other documents," added Roy. "But you define where the MOC process applies in your PSM program, as well as the phases of the process life cycle, and the source of changes, such as from hardware, software, procedures, personnel or organization.”
However, it's the regulations that define what a change is. "Any modification that touches the process safety information is considered to be a change," added Roy. "Included in the PSI are the information about the chemicals used or produced by your operation, process technologies and process equipment, process flow diagrams (PFD), process piping diagrams (P&ID), process descriptions, risk hazard analysis (PHA), safety requirement specification (SRS), and codes and standards relied on to establish good engineering practice at your facility."
Once requested changes have been reviewed and accepted, the PSSR is used to close the MOC process. After a change is implemented and is running as part of the application, MOC compliance audits are done periodically to check its performance, usually every three years or annually. OSHA also conducts similar program quality verifications (PQVs).
Roy added that laws and agencies regulating the MOC process include:
Other non-regulatory agencies and voluntary industry groups that promote MOC in process safety include the U.S. Chemical Safety Board (CSB), the Center for Chemical Process Safety (CCPS) and OSHA's Voluntary Protection Programs (VPP).
Roy explained that OSHA's minimum requirements for MOC include:
Roy said there are 14 basic elements to develop and implement a MOC that complies with OSHA's Process Safety Management (PSM) standard. They are contained in its Log 300 document and include:
Besides dealing with each requirement, Roy added that their interrelationships also are important and that OSHA will cross-check to see if they show that the changes have been followed through to completion. "The PSM district offices routinely check three key elements to verify that changes have been implemented," he said. "They are 1910.119(e) Process Hazard Analysis, 1910.119(f) Operating Procedures and 1910.119(g) Training."
Roy added, "There are different ways to apply a MOC process, but the law has these 14 elements, so users must fit their culture within them. There are many new and online tools to help with this, but users must also stay flexible and not get too locked into their tools either."
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"Management of change is not a form. It's a process." Invensys' Ulric Roy explained how change management methodologies work to fulfill OSHA's process safety management requirements.
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