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  Pump min.flow , Control valve hydraulic ¹× Metering pump¿¡ °üÇØ Áú¹®µå¸³´Ï´Ù.
  ±Û¾´ÀÌ : chan   °íÀ¯ID : rndcks     ³¯Â¥ : 20-03-25 21:58     Á¶È¸ : 6058    
¹Ù»Ú½Åµ¥µµ ºÒ±¸ÇÏ°í Á¦ Áú¹®À» ÀоîÁÖ½Ã°í ´äº¯Áֽô °í¼ö´Ôµé²² °¨»çÇÏ´Ù´Â ¸»¾¸ ¸ÕÀú µå¸³´Ï´Ù. Áú¹®Àº »ó±â Á¦¸ñ°ú °°½À´Ï´Ù.
1. ÀϹÝÀûÀ¸·Î Pump minimum flow line Àº Normally not flow ÀÌÁö¸¸ ÇØ´ç line ÀÇ À¯·®Àº pump rated capacity ÀÇ 30~35%Á¤µµ·Î Àâ´Â°É·Î ¾Ë°í ÀÖ½À´Ï´Ù.
ÇÏÁö¸¸ ÀÌ·± Åë»óÀûÀÎ °³³ä¿¡¼­ ¹þ¾î³ª min flow/rated capacity °¡ 40~50% ÆßÇÁµéÀ» Á¾Á¾ ¸ñ°ÝÇÕ´Ï´Ù. ÀÌ·± ÆßÇÁµéÀ» ÆßÇÁ performance curve Ãø¸é¿¡¼­ Çؼ® Çغ¸¾ÒÀ»¶§, Min.flow ÀÇ À¯·®ÀÌ Å©±â ¶§¹®¿¡ ±×¸¸Å­ ÆßÇÁÀÇ ¿îÀü¹üÀ§´Â ÁÙ¾îµé°í ±×·¸±â¿¡ ¼º´ÉÀÌ ÁÁÁö ¸øÇÑ ÆßÇÁ¶ó´Â »ý°¢ÀÌ µì´Ï´Ù. ÀÌ·± ÀúÀÇ »ý°¢ÀÌ ¸Â´ÂÁö¿¡ ´ëÇØ Áú¹®µå¸³´Ï´Ù.
2. ÇöÀç ISO Drawing ÀÌ ³ª¿À±â Àü¿¡, fitting ·ù Áß elbow ¸¦ »ó»óÀ¸·Î ¼¼¾î°¡¸ç Control valve hydraulic À» ÇÏ°í ÀÖ½À´Ï´Ù. ÀÌ »óȲ¿¡¼­ Áú¹®µå¸³´Ï´Ù.
Cotrol valve ´Â ±× ¸ñÀû¿¡ ¸Â°Ô ¾Ð·Â ¸ñÇ¥°ªÀÌ ÀÖ½À´Ï´Ù. ±×·¸´Ù¸é ¸¸¾à elbow ¸¦ ¸¹ÀÌ Áý¾î³Ö°Ô µÇ¸é ÃÖÁ¾ ¸ñÀûÁöÁ¡¿¡ µµ´ÞÇßÀ»¶§ÀÇ ¾Ð·ÂÀº ÁÙ¾îµé°í ±×¸¸Å­ ÄÁÆ®·Ñ ¹ëºê delta P µµ ÁÙ¾îµé°ÍÀÔ´Ï´Ù. °á°úÀûÀ¸·Î Á÷°æÀÌ Å« Control valve ¸¦ »ì°ÍÀÌ°í¿ä. ÀÌ¿Í ¹Ý´ë·Î elbow ¸¦ Àû°Ô Áý¾î ³ÖÀ¸¸é, ÄÁÆ®·Ñ ¹ëºê delta P°¡ Ä¿Á®¼­ Á÷°æÀÌ ÀÛÀº Control valve ¸¦ »ì°ÍÀÔ´Ï´Ù. ¹°·Ð opening ÀÇ Á¤µµ·Î elbow °¹¼ö¿¡ µû¸¥ ¾Ð·Â º¯È­´Â Cover µÉ°ÍÀ̶ó »ý°¢ÇÕ´Ï´Ù. ÇÏÁö¸¸ ¿£Áö´Ï¾îÀ̱⿡ ¾î¶°ÇÑ ¹æ¹ýÀÌ Control valve hydraulic °üÁ¡¿¡¼­ º¸´Ù Ÿ´çÇÑ ¹æ¹ýÀÎÁö Á¤È®ÇÏ°Ô ¾Ë°í ½Í½À´Ï´Ù. Áï, Control valve ¸¦ Å« °É »ç¼­ opening Á¤µµ¸¦ Á¶±Ý ¿©´Â°Ô ¸Â´Â°ÍÀÎÁö ¹Ý´ë·Î ÀÛÀº °É »ç¼­ opening Á¤µµ¸¦ ¸¹ÀÌ ¿©´Â°Ô ¸Â´Â°ÍÀÎÁö¿¡ ´ëÇØ Áú¹®µå¸³´Ï´Ù.
3. Metering pump ´Â ¿Õº¹ÆßÇÁÀ̱⿡ shut off pressure °¡ ÀÇ¹Ì ¾ø´Â °ÍÀ¸·Î ¾Ë°í ÀÖ½À´Ï´Ù. ±×·¸±â¿¡ pump ÈÄ´Ü¿¡ ´Þ¸®´Â PSV Set pressure ·Î pump dischrage line ÀÇ design pressure¸¦ ¼±Á¤ÇÏ´Â °ÍÀ¸·Î ¾Ë°íÀÖ½À´Ï´Ù. Áú¹®µå¸³´Ï´Ù.
¿ì¼± Metering pump ÈÄ´Ü¿¡ PSV °¡ ´Þ·ÁÀÖ´Â ÀÌÀ¯°¡ ±Ã±ÝÇÕ´Ï´Ù. »ç°ßÀ¸·Î´Â Metering pump´Â Á¤·®ÀÇ ¾×ü¸¦ À̼۽ÃÅ°´Â ÆßÇÁÀÌ°í, ÆßÇÁ ÈÄ´ÜÀº ¾Ð·ÂÀÌ ³ô±â¿¡ Cavitation°ú °°ÀÌ vapor¸¦ ¹ß»ý½Ãų ¿ä¼Ò°¡ ÀüÇô ¾ø´Ù°í ÆǴܵ˴ϴÙ. ±×·¸±â¿¡  PSV°¡ ÇÊ¿ä¾ø´Ù°í »ý°¢ÇÕ´Ï´Ù...
¶ÇÇÑ, ÀϹÝÀûÀ¸·Î PSV Set pressure ´Â ¿¬°áµÇ¾î ÀÖ´Â Equipment ÀÇ design pressure ·Î ¾Ë°í ÀÖ½À´Ï´Ù. ´Ü, ¸»¾¸µå¸° Pump ÈÄ´Ü¿¡ ÀÖ´Â PSV set pressure ´Â ¾î¶² ±âÁØÀ¸·Î °áÁ¤µÇ´ÂÁö ¿©Â庾´Ï´Ù. 
±ä±Û ÀоîÁּż­ °¨»çÇÕ´Ï´Ù. ½ÅÀÔ¿£Áö´Ï¾îÀ̱⿡ ¸ð¸£´Â °Íµµ ¸¹°í ¾Ë°í ½ÍÀº°Íµµ ¸¹½À´Ï´Ù. ºÎµð ¸¹Àº µµ¿ò ºÎŹµå¸³´Ï´Ù. °¨»çÇÕ´Ï´Ù.

½ºÅ×Æijë Stefano   20-03-26 16:28
(A1) Pump Minimum Flow Line¿¡ "NNF(Normally No Flow)"¶ó°í ¾²¿©ÀÖ´Â °æ¿ì, Á¤»ó¿îÀü Áß¿¡´Â  ±× Minimum Flow Line¿¡ È帣´Â À¯·®ÀÌ 0ÀÌ µÇµµ·Ï SystemÀ» ±¸¼ºÇØ µÎ¾úÀ» °ÍÀÓÀ¸·Î Á¤»ó¿îÀü½Ã ±× À¯·®Àº °í·ÁÇÒ ÇÊ¿ä´Â ¾ø½À´Ï´Ù.  Pump Rating À¯·®Àº Pumping ÃÖ´ëÀ¯·®ÀÌ µÇ´Â ¿îÀüÁ¶°ÇÀ» °í·ÁÇÏ¿© ¿©À¯¸¦ µÎ°í °áÁ¤µÇ´Â °ÍÀ̹ǷΠÃÖ´ë ÇÊ¿äÀ¯·®¿¡ 5~10%¿©À¯¸¸ ÃëÇÏ¸é µË´Ï´Ù.  ºÒÇÊ¿äÇÏ°Ô °ú´Ù À¯·®À¸·Î ¼±Á¤ÇØ µÎ¸é È¿À²ÀÌ ¶³¾îÁø »óÅ·Π¿îÀüµÉ °ÍÀ̹ǷΠºÎÀûÀýÇÕ´Ï´Ù.  30~50%À¯·®À» ÃëÇÏ°í ÀÖ´Ù¸é ¾î¶² Ÿ´çÇÑ ÀÌÀ¯¸¦ °¡Áö°í ÀÖÀ» °ÍÀÔ´Ï´Ù.  (ºÎÇÏÁõ°¡ ´ëºñ,  Reflux Ratio Áõ°¡´ëºñ,  µîÀÇ »çÀ¯)

(A2) Piping Isometric DrawingÀÌ ¿Ï·áµÇ±âÀü Valve, Elbow, µî FittingÀ» »ó»óÇؼ­ Equivalent Length¸¦ ÃßÁ¤ÇÏ´Â °æ¿ì¶ó¸é ¾ÆÁÖ °æÇéÀÌ ¸¹Àº ¿£Áö´Ï¾î¿¡ ÇØ´çÇÕ´Ï´Ù.  ¾ÆÁÖ ¿À·¡Àü ÀÌ ¹æ¹ýÀÌ »ç¿ëµÇ¾úÁö¸¸ ÇöÀç´Â °ü°æ¿¡ µû¸¥ Equivalent Length¸¦ ÃßÁ¤ÇÏ´Â µµÇ¥¸¦ »ç¿ëÇÏ´Â ¹æ¹ýÀÌ »ç¿ëµË´Ï´Ù.     

Control ValveÀÇ Â÷¾Ð(¥ÄP)Àº ÇØ´ç ¹è°üÀüü Â÷¾ÐÀÇ ¾à 1/3Á¤µµ°¡ µÇµµ·Ï ¼±Á¤ÇÏ´Â °ÍÀÌ Àû´çÇÑ °ÍÀ¸·Î ¾Ë·ÁÁ® ÀÖ½À´Ï´Ù.  ±×º¸´Ù ÀûÀ¸¸é Á¶ÀýÀÌ ¹Î°¨ÇÏÁö ¾Ê°í ±×º¸´Ù Å©´Ù¸é µ¿·Â¼Õ½ÇÀÌ ¸¹°í ¹è°ü ¾Ð·Â¼Õ½ÇÀÌ ¹«½ÃÇÒ ¸¸ÇÑ °æ¿ì¶ó¸é 10 psi(0.7bar) Á¤µµ·Î Á¤ÇÏ¸é µË´Ï´Ù. 

¹è°ü¼³°è°¡ ¿Ï¼ºµÇ´Â °úÁ¤¿¡¼­ Hydraulic Analysis¸¦ ÅëÇÏ¿© ÀûÀý¼ºÀ» Â÷ÈÄ È®ÀÎÇÏ¸é µË´Ï´Ù.  (¹è°ü°æÀ» Á¶ÀýÇϰųª Control ValveÀÇ  ¥ÄP¸¦ º¯°æ)  ´ëü·Î Control ValveÀÇ  Â÷¾ÐÀ» º¯°æÇÏ´Â °æ¿ì´Â ±×¸® ¸¹Áö ¾Ê½À´Ï´Ù. 

(A3) Piston ȤÀº Diaphragm ½Ä Metering Pump¾ß¸»·Î Pump Shut-off Pressure°¡ °¡Àå Å« ¿µÇâÀ» ÁÖ°Ô µÇ´Â ÆßÇÁ¿¡ ÇØ´çÇÕ´Ï´Ù.  ¿Ö³»Çϸé Piston µîÀ¸·Î ¹Ð¾î³½ ¾×üÀÇ ºÎÇÇ°¡ ¹èÃâµÇÁö ¾ÊÀ¸¸é ¸ðÅÍ°¡ ¹Ð¾î³¾ ¼ö ÀÖ´Â ÃÖ´ëÀÇ ¾Ð·ÂÀÌ °É¸®°Ô µÉ °ÍÀÌ°í Pump CasingÀÌ ±× ¾Ð·Â¿¡ °ßµðÁö ¸øÇϸé Pump°¡ ¸ÕÀú ÆÄ¼ÕµÉ °ÍÀ̱⠶§¹®ÀÔ´Ï´Ù.

µû¶ó¼­ ¹Ýµå½Ã PSV°¡ ¹èÃâÃø¿¡ ¼³Ä¡µÇ¾î¾ß ±× ÈÄ´Ü¿¡ ¿¬°áµÇ´Â ÀåÄ¡µµ º¸È£µÉ ¼ö ÀÖ½À´Ï´Ù.  Pump º¸È£¸¦ À§ÇØ ÀÚü¿¡ (³»ÀåÇüÀ¸·Î) PSV°¡ ´Þ·ÁÀÖ´Â °æ¿ì°¡ ÀÖ°í ¸¸ÀÏ ÆßÇÁ¿¡ ´Þ·ÁÀÖÁö ¾ÊÀ¸¸é ÆßÇÁ ÀÚü¸¦ º¸È£Çϱâ À§Çؼ­ ¹è°ü¿¡ º°µµ·Î ´Þ¾Æ µÎ¾î¾ß ÇÕ´Ï´Ù.  À̵é PSV´Â ÆßÇÁ¸¦ º¸È£Çϱâ À§ÇÑ PSV¿¡ ÇØ´çÇÕ´Ï´Ù.

Centrifugal PumpÀÎ °æ¿ì¿¡´Â Pump DishargeÃø¿¡ ¿¬°áµÇ´Â ±â±âÀÇ Ãⱸ°¡ ´ÝÈ÷´Â °æ¿ì Çش翬°á±â±â¿¡ Pump Shut-off Pressure°¡ °É¸± ¼ö Àֱ⠶§¹®¿¡ ÀÌ ¾Ð·ÂÀ» Âü°íÇÏ¿© ¼³°è¾Ð·ÂÀ» Á¤ÇØ¾ß ÇÕ´Ï´Ù.     

ÆßÇÁ³ª ±â±âº¸È£¸¦ À§ÇØ ¼³Ä¡µÇ´Â PSV´Â ÈÄ´Ü¿¡ ¿¬°áµÇ´Â ±â±âÀÇ Cavitation°ú ÀüÇô °ü·ÃÀÌ ¾ø½À´Ï´Ù.  "Cavitation"À̶ó´Â ¿ë¾î´Â (ÁÖ·Î Centrifugal) Pump¿¡ Èê·¯µé¾î¿À´Â Suction °ú  Pump Internals (Casing, Impeller)°ü °ü·ÃµÈ ¿ë¾îÀÌÁö  Pump DischargeÃøÀ̳ª ÈÄ´Ü¿¡ ¿¬°áµÇ´Â ±â±âµî°ú °ü·ÃµÇ¾î »ç¿ëÇÏ´Â ¿ë¾î°¡ ¾Æ´Õ´Ï´Ù .

Pump ÈÄ´Ü¿¡ ¼³Ä¡µÇ´Â ±â±âÀåÄ¡ º¸È£¿ë PSV´Â ´ç¿¬È÷ ÇØ´ç±â±âÀåÄ¡ÀÇ ¼³°è¾Ð·ÂÀÌ ¼³Á¤¾Ð·ÂÀÌ µË´Ï´Ù. 
  ±â±âÀåÄ¡ ¼³°è¾Ð·Â ¡Ã  PSV ¼³Á¤¾Ð·Â  ........(1)
chan rndcks   20-04-18 22:59
½ºÅ×Æijë´Ô, ¾÷¹«°¡ ¹Ùºü¼­ ´äº¯¿¡ ´ëÇÑ °¨»çÀÎ»ç µå¸®´Â °ÍÀÌ ´ÊÀº Á¡ ¾çÇØ ºÎŹµå¸®¸ç ´äº¯ ¸Ó¸® ¼÷¿© °¨»çµå¸³´Ï´Ù.

Á¦ ±ÛÀÌ µÎ¼­¾øÀÌ ÀÛ¼ºµÇ¾î Áú¹®ÀÇ Àǵµ°¡ ¸íÈ®È÷ Àü´ÞµÇÁö ¾Ê¾Ò±â¿¡ ÀçÁú¹® ¹× ´äº¯¿¡ ´ëÇÑ ±Ã±ÝÁõÀ» Áú¹®µå¸®°íÀÚ ÇÕ´Ï´Ù.

1. 1¹ø Áú¹®ÀÇ 30~35% ¹× 40~50%ÀÇ Àǹ̴ pump minimum flow(ºÐÀÚ)/pump rated capacity(ºÐ¸ð)¿¡ ´ëÇÑ Áú¹®ÀÔ´Ï´Ù. Áï, Pump minimum flowrate´Â rated capacity ÀÇ 30~35% Á¤µµ°¡ ÀϹÝÀûÀÎ ¼öÁØÀ¸·Î ¾Ë°íÀִµ¥ 40~50%±îÁö ÀâÇôÀÖ´Â °ÍµéÀÌ ÀÖ½À´Ï´Ù. ÀÌ´Â ºÐ¸í PumpÀÇ operating ranger°¡ ÁÙ¾îµå´Â °á°ú¸¦ ÃÊ·¡ÇÒ ¼ö ÀÖ°í ±×·¸´Ù¸é ±× Pump ´Â ¼º´ÉÀÌ ¶³¾îÁö´Â Pump¶ó°í »ý°¢Çϴµ¥, ÀÌ°ÍÀÌ ¸Â´ÂÁö¿ä?

2. Control valve hydraulic ¾÷¹«´Â µµ¿ò ÁֽŠ´ö¿¡ ¼ö¿ùÇÏ°Ô ³¡³¾ ¼ö ÀÖ¾ú½À´Ï´Ù. ´Ü, ±Ùº»ÀûÀÎ ±Ã±ÝÁõÀÌ »ý°å½À´Ï´Ù. Control valve ¸¶´Ù Pressure control vavlve(PV), Flow Control valve (FV), Level Control valve(LV) µî, ÁÖ¾îÁö´Â Description ÀÌ ´Ù¸£Áö ¾Ê½À´Ï±î? ÀÌ·¯ÇÑ DescripitionÀº ¾î¶² ±âÁØÀ¸·Î ¼±Á¤µÇ´Â °ÍÀÎÁö¿ä? Control valvel ÀÇ ¸ñÀûÀº ¾Ð·ÂÀ» Á¶ÀýÇÏ´Â °ÍÀε¥ ±×·¸´Ù¸é ¸ðµç Control valve ´Â Pressure control valve ·Î ºÒ·Á¾ß µÇ´Â °ÍÀÌ ¾Æ´Ñ°¡ ¶ó´Â ±Ùº»ÀûÀÎ Áú¹®ÀÔ´Ï´Ù.

3. Metering pump discharge PSV Çʿ伺Àº ´äº¯´ö¿¡ ÀÎÁöÇß½À´Ï´Ù. ´Ù¸¸, ±Ã±ÝÁõÀÌ ÀÖ½À´Ï´Ù. Diaphragm À̶ó´Â ¹®±¸¸¦ »ç¿ëÇϼ̴µ¥, Diaphragm ÀÇ ÁÖ ¸ñÀûÀº ºÎ½Ä ¹æÁö·Î ¾Ë°í ÀÖ½À´Ï´Ù. ±×·¸±â¿¡ Fluid °¡ Corrosive Çϸé transmitter ¿¡ DiaphragmÀ» Àû¿ëÇÏ´Â µîÀÇ ¹æ¹ýÀ» »ç¿ëÇÏ´Â °ÍÀ¸·Î ¾Ë°í ÀÖ°í¿ä. Áú¹®Àº Demineralized water ¸¦ ´Ù·ç´Â Pump°¡ diaphragm pumpÀÏ ÀÌÀ¯°¡ ÀÖÀ»±î¿ä? ¾Æ´Ï¸é Metering pump¶ó¸é ÀüºÎ Diaphragm ÀÌ Àû¿ëÀÌ µÇ´Â °ÍÀΰ¡¿ä??

Ç×»ó Ä£ÀýÇÏ°í ÀÚ¼¼ÇÑ ´äº¯ °¨»çµå¸³´Ï´Ù.
   

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