API 674 Positive displacement pump ÀÇ °æ¿ì Pump NPSHa °è»ê½Ä¿¡ acceration head °ªÀ» »©ÁÖ¾î NPSHa °ªÀ» °è»êÇÏ´Â °ÍÀ¸·Î ÀÌÇØ µË´Ï´Ù.
¸¸¾à NPSHa °¡ NPSHr º¸´Ù ÀÛÀ¸¸é, suction head º¸»ó!? ÇØÁÖ±â À§ÇØ Pulsation dampener ¸¦ ¼³Ä¡ Çϴµ¥,
1. À̶§ Pulsation dampener ¼³Ä¡ Çϸé, ¾Æ·¡ equation ¿¡¼ ¾î´À Ç׸ñ¿¡ ¾ó¸¶ÀÇ factor ¸¦ ÁÖ¾î NPSHa ¸¦ ³ôÀÏ ¼ö ÀÖ´Â °ÍÀΰ¡¿ä? ¹®ÇåÀ̳ª °æÇèÄ¡ °¡ ±Ã±ÝÇÕ´Ï´Ù.
ex) NPSHa = h (absolute pressure head) - hvp (vapour pressure) + hst (static head) - hf (friction loss) - ha (acceleration head)