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Praveen Dhote

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Praveen Dhote

Praveen Dhote

Process Safety Team Leader, Siemens

Mr. Praveen Dhote is a process safety team leader at Siemens LLC, Abu Dhabi, UAE. He is a Chemical Engineer with 16 years of experience specializing in process safety management (PSM) studies and has extensive experience across Asia, central Africa, the Middle East and the USA.

Praveen has been leading various process safety studies for more than 10 years such as Quantitative Risk Assessment (QRA), Process Hazard Analysis, Pressure Relief Analysis, Flare header Analysis, Dispersion Analysis, Hazard and Operability Study (HAZOP), Hazard Identification Study (HAZID), for oil & gas, petrochemical and chemical projects at various locations. He is a Certified Functional Safety Professional.

Risk Reduction Flare System with Safety Life Cycle Approach

Functional Safety & SIS

Abstract: High relief load to the flare with hydraulic issues often demand to change header size or optimize the relief load in order to avoid the overpressure scenarios. High back pressure issues could damage the PZVs and result in loss of containment, these conditions could result in damage to the plant, the environment, loss of life and financial consequences.

Changing a header size may not be always feasible due to many constraints. Thus, traditionally HIPPS (High Integrity Pressure Protection Systems) are installed to provide protection to critical equipment ranging from high/low pressure interfaces to equipment overpressure scenarios in upstream and downstream processes. HIPPS generally shut down, reduce, or divert the pressure sources such as feed pump, compressor or heating medium to avert the overpressure scenario. HIPPS also beneficial where overpressure in a system causes a huge liquid or vapor relief load being sent to a flare system, the right HIPPS system can help reduce excessive load on an existing flare system and eliminate the high costs associated with purchasing new relief devices, resizing existing flare headers, re-rating flare knock out drums, redesigning the flare stack, etc., in addition to the opportunity costs due to loss of operations.

Currently, the approach is to design HIPPS for flare load reduction as a Safety Integrity Level (SIL) 3 Safety Instrumented Function (SIF) or a SIL 2 SIF (depending on the code or company standard being followed). This work discusses how instead of taking the customary “one size performance fits all approaches”, the design could be based on a IEC 61511 Safety Lifecycle view point to determine the required risk reduction and thereby choosing the actual required SIL. This presentation will discuss current practices; review benefits and drawbacks of SIL selection in these scenarios, and describe the impact on total cost of ownership

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