¾È³çÇϼ¼¿ä. ½ºÅ×Æijë´Ô°ú ¿©·¯ ȸ¿ø´Ôµé.
¸Å¹ø ÀÌ°÷¿¡¼ ½ºÅ×Æijë´ÔÀÇ °í°ß¿¡ ¸¹Àº °ÍÀ» ¹è¿ì°í ÀÖ½À´Ï´Ù.
ÀÌÀü¿¡ Gravity line sizingÀÇ Criteria¿¡ ´ëÇÏ¿© Áú¹®ÇÑ °ÍÀÌ ÀÖ¾ú½À´Ï´Ù.
ƯÈ÷ Vertical gravity line sizing¿¡´Â ¹Ù·Î Froude number°¡ Áß¿äÇÑ °í·Á »çÇ×Àε¥, Froude number°¡ 0.3ÀÌ ³ÑÁö ¾Ê°Ô²û Gravity line sizingÀ» ÇØ¾ß ÇÑ´Ù°í, Norsok P001¿¡ ³ª¿Í ÀÖ½À´Ï´Ù.(Air entrainment¸¦ ¹æÁö)
ÅäÅ»»ç³ª ½¦ºê·Ð »ç¿¡´Â Gravity line sizing(ƯÈ÷ Drain line)À» À§Çؼ ´ÜÁö °¢°¢ 0.8m/s ¹× 0.6m/s¸¦ °í·ÁÇؾßÇÑ´Ù°í ºñ±³Àû °£´çÇÏ°Ô ±ÔÁ¤ÇÏ°í ÀÖ´Â ¹Ý¸é¿¡ NorsokÀº Á» ´õ º¸¼öÀûÀÎ Criteria·Î º¼ ¼ö ÀÖÀ» °Í °°½À´Ï´Ù.(¿¹¸¦ µé¾î Froude number 0.3À» ³ÑÁö ¾Ê±â À§Çؼ´Â 4" lineÀÇ °æ¿ì ´ë·« 0.3~0.4m/sÁ¤µµÀÇ ¼Óµµ°¡ ³ª¿È) µû¶ó¼ ÀÌ Froude number¸¦ ÀÌ¿ëÇÑ Vertical gravity line sizingÀº Rainwater³ª DelugeÀÇ °æ¿ì Àû¿ëÇϱ⿡´Â ³Ê¹« ¸¹Àº Downcomer(¹è¼ö±¸)¿Í Å« LineÀÌ ÇÊ¿äÇϱ⠶§¹®¿¡ Àû¿ëÄ¡ ¾Ê°í ´ÙÀ½ ½ÄÀ» ÀÌ¿ëÇϵµ·Ï Norsok P001¿¡ ³ªÅ¸³ª ÀÖ½À´Ï´Ù. ±× ³»¿ë°ú ½ÄÀº ´ÙÀ½°ú °°½À´Ï´Ù.
Drainage of deluge water from drain boxes through vertical lines shall be sized on basis of 50 % of the
available head (assuming the pipe running full of liquid) and not Froude number. The following formulas can
be used to determine the capacity:
where
Q is the flow in m3/h
f is the Moody friction factor
D is the pipe inner diameter in m
The Moody friction factor for fully turbulent flow can be calculated by the Nikuradse formula, given by:
where the pipe diameter D and pipe roughness k shall be given in the same units.
The flow formula is based on setting 50 % of the available head equal to the piping friction loss i.e.
¿¹¸¦ µé¾î f = 0.01·Î °¡Á¤ÇÏ°í, 2" lineÀ¸·Î È帣´Â À¯·®À» »ìÆ캸¸é ¾à 51m3/hrÀÇ À¯·®ÀÌ ³ª¿À´Âµ¥, ÀϹÝÀûÀ¸·Î 2" lineÀ» 1m/s·Î Èê·¯°£´Ù°í °¡Á¤ÇßÀ»¶§ 6.7m3/hrÁ¤µµÀÇ À¯·®ÀÌ ³ª¿À´Â °Í°ú ºñ±³ÇÏ¿© ¸Å¿ì Å« À¯·®ÀÌ °è»êµÇ¾ú½À´Ï´Ù. Áï 51m3/hr·Î È帥´Ù°í ÇÏ¸é ¾à 8m/sÁ¤µµÀÇ ¼Óµµ·Î ¹°ÀÌ È帥 ´Ù´Â °ÍÀε¥, ÀÌ°ÍÀº ³Ê¹« ºü¸¥ ¼Óµµ°¡ ¾Æ´ÑÁö¿ä.
¿©±â¼ ÀúÀÇ ±Ã±ÝÁõÀº ´ÙÀ½°ú °°½À´Ï´Ù.
1. Á¦°¡ °è»êÇÏ¿© ³ª¿Â 51m3/hrÀÇ À¯·®ÀÌ Rainwater(Deluge) drain vertical line sizing¿¡ °ú¿¬ ÇÕ´çÇÑÁö Àǹ®ÀÔ´Ï´Ù.
2. Norsok¿¡¼ ±ÔÁ¤ÇÏ´Â Froude number°¡ 0.3ÀÌ ³ÑÁö ¾Ê¾Æ¾ß ÇÏ´Â Criteria´Â Air entrainment ¸¦ ¹æÁöÇϱâ À§ÇÔÀ̶ó°í °£·«È÷ ÀûÇô Àִµ¥, ÀÌ Air entrainment°¡ Gravity line sizing¿¡ ¿Ö Áß¿äÇÑÁö¸¦ ¸ð¸£°Ú½À´Ï´Ù.
Âü°í¿ëÀ¸·Î Norsok P001ÀÇ ¸µÅ©¸¦ Çϱ⿡ Àû¾î µÎ¾ú½À´Ï´Ù. OpenµÈ StandardÀ̸ç, Offshore »ê¾÷¿¡¼ ÀÚÁÖ ¾²ÀÌ´Â StandardÀ̹ǷΠÇÊ¿äÇϽŠºÐµéÀÌ ÂüÁ¶ÇϽøé ÁÁÀ» °Í °°½À´Ï´Ù.
Gravity line sizingÀÌ Pressurized line sizingº¸´Ù ´õ ¾î·Á¿î °Í °°½À´Ï´Ù.
½ºÅ×Æijë´Ô, ¸¹Àº °í¼ö´Ôµé²² µµ¿òÀ» ºÎŹ µå¸³´Ï´Ù.