Document ByDEy410XJO9Vpox2pgnxYMbo

boa C. Pat<m/j. J. no4mr 1210 A. J. Rago 1460 J. 0. FrederDc October 2*# 1971 nun Co. DMf Cody* Thank you r#py such for your phone oall. I hare ImUM pur our eoneeraatlon# fifteen seta of Theswdnol 55 and Thendnol 66 literature. X hare alao Included sererel copies of our suggested expansion tank layout for thaaa produets aa wall aa copies of the toxicity statement on both Thendnol 55 and Thendnol 66. Aa pointed out during our swetlng on deptenber 21* tha Themlnol Fit aarlaa fluids contain polychlorinated biphenyls (PCBs) of various types. Tha PCI concentration la our anrlroaecnt haa increasingly ecus undar tha aarutlay of various govemeen* tal agencies and aalantlfla laboratories. In aoaa studies# oartaln PC8a have baao found to ba a parslatant cnvlronacntal oontaalnant and# possibly# injurious to aartaln fona of bird# aquatic and anlaal Ufa. Accordingly it la vary important that PCBa ba leapt out of tha food chain. All uaara of PCB-contalnlng products wust taka extreee eara to prevent any entry into tha anvlronaent through spills, leakage# use# disposal, vaporisation or otherwise. We ara particularly concerned over tha leakage of this product at your rail aiding where It la uaad to haat pitch eara. va feel that adequate control of leakage at thla point oaanot ba earrlad outi therefore# we encourage your consideration of a ohange to a non-PCS containing fluid. Fortunately# your total aystea aontaina aultlpla# lndapandant heating loops and lands Itself to a sequential change of haat transfer fluid without a long interruption of your operation. A ohange to either Tharsd.no1 55 or Tharmlnol $6 would not re* quire aejor modification to tha existing systauu Materials of construction presently Installed ara eoapetlble with thaaa two DSW 018098 STLCOPCB4004643 2- - fluids. X see only two areas that would require specific con sideration in the use of a non-FR type heat transfer fluid such as Therminol 55 or Therminol 66. These are the need for additional protective equipment to minimize fire risk and pro- ; tection of the hot fluid from air contact to minimize oxidative ' decomposition. Concerning the fire risk question, I see the need for either a C02 or steam snuffing system on the heater to provide a means to quench any abnormal fire conditions within the heater proper. A sprinkler system in the user and heater area may also be re quired. I would suggest you consult with your insurer for the need of fire risk- protection equipment. The data provided on Therminol 55 and Therminol 66 gives flash, fire and autoignition temperature points to assist in evaluating the degree of fire risk. The second area for consideration involves air contact with hot fluid at the expansion tank and at the tankcar heating station. The expansion tanks for this system can be easily fitted with an inert gas blanket thus precluding air contact with hot flyld in the tank. At the rail siding, however, I feel we have a more difficult problem in that the hot fluid lines are discon nected after the car is unloaded and retention of the fluid in the car coil has not always been successful. The admission o hot Therminol 55 or Therminol 66 into an empty pitch car coii certainly involves intimate air contact which can lead to oxi dative decomposition of the heat transfer fluid. This type of decomposition can bring about the formation of carbonaceous type particles in the fluid lines which would de tract from performance of the fluid after some period of time. To minimize air contact with hot fluid at the tank car heating station, I would suggest Installation of ball valves at the end of the flexible hose, so that fluid in the hose can be not only retained but protected from air contact. In the event fluid is lost from the tank car coil, I would recommend filling the empty coil with cooled fluid to drive the air out prior to introducing the hot fluid for heating the pitch. Unfortunately, the car heating area has the greatest leakage of FR fluid and is the one that will present the greatest prob lems on converting to a non-FR fluid. As an alternate to total changeover, I recommend you evaluate the possibility of converting the pitch car and pitch storage heating loop from FR to Therminol 55 or 66. Conversion of the other three Therminol FR-1 loops can be done at a later date, since these three loops do not have the degree of leakage ex perienced at the pitch car heating station. DSN 018099 VS ft STLCOPCB4004644 D 3- - Both Andy Rego, our Therminol representative in Cincinnati, and me would be happy to work with you to accomplish a satis factory change from Therminol FR to a non-FR heat transfer fluid. We will schedule another visit with the people con cerned with,this situation at National Southwire, after you have had tiffle to review the data. In the Interim, please feel free to call either Andy or me in the event you have any questions; . Sincerely, cs Enclosures D. E. Roush Product Specialist Heat Transfer Fluids DSW 018100 STLCOPCB4004645