The primary element used to measure flow develops a diff pressure range vs a range of steam flow , this is determined by the manufacturer of the primary element ( there should be a spec sheet ). With this information you use a normalized scaling equation as follows: flow =3D ( flow range = ) times Square root of ( measured differential pressure across primary element divided by the differential range of the primary element). If the range of flow is in lbs/hr then divide the result by 1000 to get KPPH. This should be easily accomplished in a CALC block.=20 -----Original Message----- From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On Behalf Of BrianLong Sent: Tuesday, April 19, 2005 4:56 PM To: Foxboro Subject: [foxboro] Steam FLow Calc We are using a CALC block to calculate steam flow. The calculation is not as accurate as I'd like. Does anyone have an accurate "standard" way to calculate steam flow in K# / HR. Thanks, Brian Long Arkansas Kraft =20 =20 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html =20 foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin to unsubscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave =20 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave