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  API 520 back pressure ±âÁØ °ü·Ã
  ±Û¾´ÀÌ : ÇÎÅ©¼ÖÆ®   °íÀ¯ID : oldironold     ³¯Â¥ : 19-10-18 08:46     Á¶È¸ : 4356    
PSV typeº° back pressure ±âÁØ¿¡ ´ëÇØ ¹®Àǵ帳´Ï´Ù.
API520 Part I (9th, 2014)
[Conventional]
5.3.3.1.3 In a conventional PRV application, when the allowable overpressure is 10 %, the BUILT-UP backpressure should not exceed 10 % of the set pressure.
[Balanced]
5.3.3.2.1 Balanced valves can typically be applied where the TOTAL backpressure (superimposed plus built-up) does not exceed
approximately 50 % of the set pressure.

Áï, conventional typeÀÇ back pressure ±âÁØÀº BUILT-UP backpressure
balanced typeÀÇ back pressure ±âÁØÀº BUILT-UP + SUPERIMPOSED backpressure À̶ó´Â °ÍÀε¥
conventional¿¡¼­ SUPERIMPOSED backpressure¸¦ °í·ÁÇÏÁö ¾Ê´Â ÀÌÀ¯°¡ ÀÖÀ»·±Áö¿ä.
Conventional typeÁß¿¡¼­ ATMÀ¸·Î ¹æÃâµÇ´Â PSV´Â superimposed backpressure¸¦ °í·ÁÇÏÁö ¾Ê¾Æµµ ¹«¹æÇÏ°ÚÁö¸¸
Flare ȤÀº ƯÁ¤ systemÀ¸·Î ¹æÃâµÈ´Ù¸é end pressure¿¡ ÇØ´çÇÏ´Â ¾Ð·ÂÀ» superimposed back pressure·Î °í·ÁÇØ¾ß ÇÑ´Ù°í »ý°¢Çϴµ¥¿ä.
À§ API ±âÁØ´ë·Î BUILT-UP backpressure¸¸ °í·ÁÇصµ µÈ´Ù¸é conventional typeÀ» Àû¿ëÇÒ ¼ö ÀÖ´Â service°¡ TOTAL backpressure¸¦ °í·ÁÇÏ´Â Á¶°Çº¸´Ù´Â Æø³Ð°Ô »ç¿ëµÉ ¼ö´Â Àְڳ׿ä.
Ȥ½Ã ÀÌ¿¡ ´ëÇÑ Á¶¾ðÀ» ºÎŹµå¸³´Ï´Ù.
Q)
Conventional : BUILT-UP backpressure < 10% of set pressure?
Balanced : BUILT-UP + SUPERIMPOSED backpressure < 50% of set pressure?

½ºÅ×Æijë Stefano   19-10-21 11:48
A1) Convertional PSV¿¡¼­ SuperImposed BackPressure(SIBP)¸¦ °í·ÁÇÏÁö ¾Ê´Â´Ù°í ÇÏ´õ¶óµµ Total BackPressure(TBP)´Â Allowable OverPressure(AOP) 10% (È­ÀçÀÇ °æ¿ì 121%)¸¦ ³Ñ¾î¼­´Â ¾ÈµÇµµ·Ï ÇØ¾ß ÇÏ´Â ±âÁØÀº (ASME, API) Code¿¡ ±âº»ÀûÀ¸·Î Á¤ÇصР¹Ù¿Í °°ÀÌ ¹Ýµå½Ã(¿ì¼±ÀûÀ¸·Î) ÁؼöµÇ¾î¾ß ÇÕ´Ï´Ù. 

µû¶ó¼­ SIBP¸¦ °í·ÁÇÏÁö ¾Ê´Â´Ù(ȤÀº °í·ÁÇÏÁö ¸»¶ó)´Â Àǹ̰¡ ¾Æ´Ï¶ó SIBP°ªÀÌ 0ȤÀº ¾îµûÇÑ °ªÀ̶ó°í ÇÏ´õ¶óµµ ÃÖ´ëÇÑÀ¸·Î Set Pressure(SP)ÀÇ 10%¸¦ ³Ñ¾î¼­´Â ¾ÈµÇµµ·Ï Ç϶ó´Â ¶æÀÌ°í...

¿©±â¿¡´Â (SIBP°¡ ´Þ¶óÁü µîÀ¸·Î ÀÎÇÑ ´Þ°¡¶ô°Å¸²À» ¹æÁöÇϱâ À§ÇÑ ¸ñÀûÀ¸·Î) Design Pressure(DP)¸¦ »ó´ëÀûÀ¸·Î ³ô°Ô Àâ¾ÆµÎ°í SP¸¦ ÀÌ¿¡ ¸Â°Ô ¼³Á¤ÇÏ¿© ¿îÀüÇÏ´Â µ¿¾È ´©¼³ÀÌ ¾øµµ·Ï ÇÑ´Ù°í ÇÏ´õ¶óµµ (Unbalanced PSV¶ó¸é) ±× ¼³ÀýµÈ SPÀÇ 10%¸¦ ³ÑÁö¾Êµµ·Ï Ç϶ó´Â Àǹ̰¡ ´ã°Ü ÀÖ´Ù°íº¾´Ï´Ù. 

°á·ÐÀûÀ¸·Î <...conventional typeÀ» Àû¿ëÇÒ ¼ö ÀÖ´Â service°¡ TOTAL backpressure¸¦ °í·ÁÇÏ´Â Á¶°Çº¸´Ù´Â Æø³Ð°Ô »ç¿ëµÉ ¼ö´Â Àְڳ׿ä...>ÀÇ »ý°¢Àº ¸ÂÁö ¾Ê½À´Ï´Ù.

A2) ÀÌ¿¡ ¹ÝÇÏ¿© TBP°¡ SPÀÇ (´ë·«) 50%ÀÇ À̳»¿¡¼­´Â "Balanced PSV¸¦ Àû¿ëÇÒ ¼ö ÀÖ´Ù"´Â °Íº¸´Ù "Balanced PSV¸¦ »ç¿ëÇÏ´Â °ÍÀÌ ±ÇÀåµÈ´Ù" ´Â °ÍÀ» ÀǹÌÇÏ°í ÀÖ°í (±× À̸鿡´Â)

"´ë·«" 50% À̻󿡼­´Â Critical Pressure(CP)¿¡ µµ´ÞÇϱ⠶§¹®¿¡ ÀüÇô ´Ù¸¥ ¹æ¹ýÀ¸·Î ±â±â¸¦ º¸È£ÇØ¾ß ÇÏÁö Balanced PSV ¸¸À¸·Îµµ ÇØ°áÇÒ ¼ö ¾ø´Ù´Â Àǹ̸¦ ´ã°í ÀÖ´Ù°í ºÁ¾ß ÇÏÁö¿ä.
   

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