Heat transfer medium systems HTM system Therminol VP1

Polyester: • HTM • HTM filling • HTM drain • HTM vent • HPD, HSA, HSB HTM Fluid Codes - HPD = Primary Liquid System (~ 340° C) - HSA = Secondary Liquid System A (~ 265 ° C) - HSB = Secondary Liquid System B (~ 285 ° C) - HSC = Secondary Liquid System C (~ 200 ° C) - HDL = HTM Drain Liquid - HDV = HTM Drain Vapour - HVV = HTM Vent Vapour - HFD = HTM Filling Line Heat Transfer Medium (HTM) - Heat transfer fluid is a eutectic mixure of two very stable compounds, DIPHENYL OXIDE (73.5%) and BIPHENYL (26.5%) These compounds have practically the same vapour pressures, so the mixture can be handled as if it were a single compound The fluid may be used in systems employing either liquid phase or vapour phase heating Diphenyl oxide - Biphenyl Eutectic = greek / Eu = good / teko = melting which means that the single compound has a much higher melting point than the mixture; Diphenyl oxide = 26 – 27° C / Biphenyl = 68 – 70° C / Eutectic mixture = 12° C - Typical HTM synonyms: Dow Chemicals: Dowtherm A Solutia: Therminol VP-1 Filling of HTM into emergency drain vessel 61D51 - HTM is filled from 200 lt barrels into 61D51 using barrel emptying pump (filling up to approx 75% of vessel capacity) - Record the number of barrels filled and mark at the floating level instr - Dewatering for at least days at 150° - 160° C with steam to avoid heating problems Filling of HTM into emergency drain vessel 61D51 - During dewatering, HTM flow through filter 61F51 is in operation, all filling valves to poly (consumers such as HTM evaporators) are closed Filling of HTM into plant - Make sure that on each floor sufficient absorption material (sand etc.) and fire extinguishers are available in case of any leakage - Open all vent valves of primay and secondary system - Open nitrogen blanketing of expension vessel 61D21 - Start filling from bottom to top using 61P51 Continue filling until level in expansion vessel 61D21 (highest point of HTM-system) start rising Fill until 61LSL211 is not active anymore (~ 30% due to liquid expansion) - Put nitrogen blanketing control valve 61PIC211 in operation Filling of HTM into plant Split range controller filling line feed line return line Example of primary HTM distribution system Example of secondary HTM distribution system Principle of HTM evaproator TI filling and venting procedure 61J51 Close Open vent valve 61D51 TIC ~ 290° C ~ 305° C TI 20E15 LSL • Do not vent for too long time • Due to venting, level in ~ 340° C evaporator will drop down • If LSL is becomes active, refill evaporator as shown before Thank you for your attention Uhde Inventa-Fischer ... Liquid System C (~ 200 ° C) - HDL = HTM Drain Liquid - HDV = HTM Drain Vapour - HVV = HTM Vent Vapour - HFD = HTM Filling Line Heat Transfer Medium (HTM) - Heat transfer fluid is a eutectic mixure... Filling of HTM into plant Split range controller filling line feed line return line Example of primary HTM distribution system Example of secondary HTM distribution system Principle of HTM evaproator.. .HTM Fluid Codes - HPD = Primary Liquid System (~ 340° C) - HSA = Secondary Liquid System A (~ 265 ° C) - HSB = Secondary Liquid System B (~ 285 ° C) - HSC = Secondary Liquid System C