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High-integrity pressure protection system
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High-integrity pressure protection system : ウィキペディア英語版
High-integrity pressure protection system

A high-integrity pressure protection system (HIPPS) is a type of safety instrumented system (SIS) designed to prevent over-pressurization of a plant, such as a chemical plant or oil refinery. The HIPPS will shut off the source of the high pressure before the design pressure of the system is exceeded, thus preventing loss of containment through rupture (explosion) of a line or vessel. Therefore, a HIPPS is considered as a barrier between a high-pressure and a low-pressure section of an installation.
==Traditional systems==
In traditional systems over-pressure is dealt with through relief systems. A relief system will open an alternative outlet for the fluids in the system once a set pressure is exceeded, to avoid further build-up of pressure in the protected system. This alternative outlet generally leads to a flare or venting system to safely dispose the excess fluids. A relief system aims at removing any excess inflow of fluids for safe disposal, where a HIPPS aims at stopping the inflow of excess fluids and containing them in the system.
Conventional relief systems have disadvantages such as release of (flammable and toxic) process fluids or their combustion products in the environment and often a large footprint of the installation. With increasing environmental awareness, relief systems are not always an acceptable solution. However, because of their simplicity, relatively low cost and wide availability, conventional relief systems are still often applied.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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