Justifying the Use of High Integrity Pressure Protection Systems (HIPPS)

2004 ◽  
Author(s):  
Edward M. Marszal ◽  
Kevin J. Mitchell
Keyword(s):  
Analytical Techniques ◽  
Chemical Plants ◽  
Pressure Relief ◽  
Emergency Relief ◽  
Body Of Knowledge ◽  
System A ◽  
Protection Systems ◽  
High Integrity ◽  
Petroleum Refineries ◽  
Relief System

As chemical plants and petroleum refineries plan for future expansion, the capability of existing pressure relief systems to safely dispose of higher capacities is often a significant constraint. Current codes and standards now allow for the use of High Integrity Pressure Protection Systems (HIPPS) in lieu of increasing the capacity of emergency relief systems. There is a significant body of knowledge on how to design a HIPPS system once the requirement for one has been established. However, there is gap in knowledge of what situations allow for HIPPS and what practical steps can be taken to determine when a HIPPS is justified. This paper describes the analytical techniques that can be used by engineers to justify a design using instrumented protection in lieu of upgrading the relief system. A review of applicable requirements from codes and standards is included along with risk-based methods to ensure a HIPPS design is as safe as — or safer than — conventional relief design.

Study on the Relief Capacity and Safety Integrity of Multiple Relief Valves of Charge Gas Pipe in Ethylene-Cracking Plant

2013 ◽  
Author(s):  
Jianxin Zhu ◽  
Xuedong Chen ◽  
YunRong Lu ◽  
Zhibin Ai ◽  
Weihe Guan
Keyword(s):  
Large Scale ◽  
Relief Valve ◽  
Pressure Relief ◽  
Emergency Relief ◽  
Safety Integrity Level ◽  
Upstream Pressure ◽  
Minimum Number ◽  
The Difference ◽  
Relief System

The shutdown of charge gas compressor in large-scale ethylene-cracking plant always involves emergency pressure relief of charge gas through multiple safety valves. The emergency relief capacity plays an important role on the safety of the overall plant. In this paper, by studying the difference between the configuration of the pressure relief system of two 1000 KTA ethylene-cracking plants (the inner diameters of the charge gas pipeline in both plants are 2m, while the number of same-sized relief valves are 28 and 19, respectively), the relief capacity of multiple relief valves is studied and compared with empirical calculation and numerical analysis. It is found that, due to the interruption of fluid flow when compressor is emergency shutdown, the upstream pressure of each relief valve increase steadily with the continuously make-up of the charge gas, but the difference between the inlet pressure of all relief valves can be neglected. With the increase of the upstream pressure, the opening of relief valves is determined mainly by the set pressure. In multiple valves pressure relief scenario, normally the downstream valves have greater relief capacity than those upstream valves if both relief valves have the same back pressure. Also, by analysis it is noted that the pressure relief capacities of multiple relief valves in both plants are sufficient. The minimum number of relief valves required for process safety is obtained. The maximum achievable Safety Integrity Level (SIL) of pressure relief system is determined by calculation of the reliability of the redundant relief valves. The analysis is used for determination of the SIL of the pressure relief system. The finding is also significant for determination of the required capacity of multiple relief valves.

High Integrity Protection Systems and Pressure Relief Systems

1999 ◽  
Author(s):  
Glenn A. Raney ◽  
Angela E. Summers
Keyword(s):  
Design Issues ◽  
Pressure Relief ◽  
Passive Protection ◽  
Industry Standards ◽  
Protection Systems ◽  
Integrity Protection ◽  
Pressure Relief Valves ◽  
High Integrity

Abstract Many Users are applying high integrity protection systems (HIPS) for overpressure protection of vessels and pipelines. HIPS can be an excellent alternative to standard, passive protection systems, if they are designed correctly. Various standards are applicable when HIPS are used in lieu of pressure relief valves. This paper will address the design issues, as well as the applicable industry standards.

scholarly journals The Pressure Relief System Design for Industrial Reactors

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Iztok Hace
Keyword(s):  
System Design ◽  
Systems Design ◽  
Process Industry ◽  
Industrial Accidents ◽  
Pressure Relief ◽  
Blow Down ◽  
Emergency Relief ◽  
Industrial Plants ◽  
Ecological Problems ◽  
Relief System

A quick and simple approach for reactor—emergency relief system design—for runaway chemical reactions is presented. A cookbook for system sizing with all main characteristic dimensions and parameters is shown on one realistic example from process industry. System design was done based on existing theories, standards, and correlations obtained from the literature, which were implemented for presented case. A simple and effective method for emergency relief system is shown, which may serve as an example for similar systems design. Obtained results may contribute to better understanding of blow down system frequently used in industrial plants, for increasing safety, decreasing explosion damage, and alleviating the ecological problems together with environmental pollution in case of industrial accidents.

Optimization of Operation Parameters for Direct Spring Loaded Pressure Relief Valve in a Pipeline System

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
Hyunjun Kim ◽  
Sanghyun Kim ◽  
Youngman Kim ◽  
Jonghwan Kim
Keyword(s):  
Pressure Relief Valve ◽  
Pipeline System ◽  
Relief Valve ◽  
Pressure Relief ◽  
Computational Costs ◽  
Constant Degree ◽  
System A ◽  
Disk Mass ◽  
Analysis Scheme ◽  
Surge Control

A direct spring loaded pressure relief valve (DSLPRV) is an efficient hydraulic structure used to control a potential water hammer in pipeline systems. The optimization of a DSLPRV was explored to consider the instability issue of a valve disk and the surge control for a pipeline system. A surge analysis scheme, named the method of characteristics, was implemented into a multiple-objective genetic algorithm to determine the adjustable factors in the operation of the DSLPRV. The forward transient analysis and multi-objective optimization of adjustable factors, such as the spring constant, degree of precompression, and disk mass, showed substantial relaxation in the surge pressure and oscillation of valve disk in a hypothetical pipeline system. The results of the regression analysis of surge were compared with the optimization results to demonstrate the potential of the developed method to substantially reduce computational costs.

Geotextile encased columns (GEC) used as pressure-relief system. Instrumented bridge abutment case study on soft soil

2017 ◽  
Vol 45 (3) ◽  
pp. 227-236 ◽  
Author(s):  
F. Schnaid ◽  
D. Winter ◽  
A.E.F. Silva ◽  
D. Alexiew ◽  
V. Küster
Keyword(s):  
Soft Soil ◽  
Pressure Relief ◽  
Bridge Abutment ◽  
Relief System

Thermographic survey of the integrity of a process plant pressure relief system

1985 ◽  
Vol 4 (3) ◽  
pp. 161-163 ◽  
Author(s):  
Brenton G. Jones ◽  
Raymond C. Duckett
Keyword(s):  
Pressure Relief ◽  
Process Plant ◽  
Relief System

Emergency Relief System Design Using DIERS Technology

1993 ◽  
Author(s):  
H. G. Fisher ◽  
H. S. Forrest ◽  
S. S. Grossel ◽  
J. E. Huff ◽  
A. R. Muller ◽  
...  
Keyword(s):  
System Design ◽  
Emergency Relief ◽  
Relief System

Lubricant for Probe-Based Ferroelectric Recording Devices

2008 ◽  
Author(s):  
Xiaoping Yan ◽  
Paul M. Joes ◽  
Lei Li ◽  
Yiao-Tee Hsia
Keyword(s):  
Analytical Techniques ◽  
Low Friction ◽  
Recording Technology ◽  
Continuous Contact ◽  
Storage Devices ◽  
Polyphenyl Ether ◽  
System A ◽  
Diphenyl Ethers ◽  
Electric Connector ◽  
The Impact

In a probe-based ferroelectric recording system a protective coating of lubricant provides low friction and a low wear rate as well as allows the continuous contact of the probe tip with the storage medium. SO5, a member of the commercially available electric connector lubricants polyphenyl ether (PPE), was experimentally proven effective as a lubricant in supporting this probe/media interface and has enabled the demonstration of the probe-based ferroelectric recording technology. The unique stability of SO5 lubricant in an electric field and in the presence of electrons makes this liquid particularly suitable for ferroelectric recording storage devices. A broad range of analytical techniques were used to identify this lubricant as a mixture of alkylated diphenyl ethers having varying molecular weight. A thin layer of this lubricant was uniformly coated on the probe media surface through a dip-lubing procedure. Its thermal stability and wettability was investigated in terms of the requirements for the successful application of this unique ferroelectric recording technology. The impact of this lubricant film on the read/write capability, durability and tribological performance was also explored.

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