Document YjJOJdpDymOo2xyaGEyJeYqEV

CO. OCO Interoffice Communication To R. H. Gerlach From P. L. Fetzer p-t. July 29, 1974 subject Ambient Air Analysis - Niels Henrik Abel loading 7-26,29-74 The Niels Henrik Abel loading was monitored using the personnel dosimeters and the Century total hydrocarbon analyzer on specific operations. An abbreviated survey of the dock area was taken but the complete area grid analysis was omitted during the loading operation. The dock operators requested that we monitor the area at the base of the dock because they could smell vinyl chloride. A fifteen minute survey of the dock area was taken using the Century hydrocarbon analyzer. Readings obtained during the survey ranged between 20 and 400 ppm. The higher readings were found in the area at the base of the dock between the vent recovery and hydroquinone addition units. An attempt was made to locate the emission source but without success. This investigation did reveal the liquid loading line connection aboard ship was leaking. Hydrocarbon readings reached 1.0/S at the connection but dissipated to less than 50 ppm a few feet away. The eductor on the sampling apparatus was again back pressured during cargo samplings due to venting of the ship cargo tanks. High dosimeter results were obtained on both the heel and finished cargo samplings, 36.5 and 42.3 ppm VCM respectively. In order to minimize this exposure, it is recommended that both loading and venting operations be shutdown while sampling cargo on all future ships. Valve packings in the vent recovery and hydroquinone addition units continue to leak. This is reflected in high dosimeters results from the vent recovery operation, 32.4 and 40.0 ppm VCI.t. Several of the valve packings which cannot be tightened further.should be replaced. It was noted that the liquid and vent hoses were blinded on the dock at the manifold block valves prior to disconnecting from the ship. This operation was not monitored with a personnel dosimeter and the Century hydrocarbon readings ranged between 15 and 300 ppm. Additional blinds of proper sizes are needed to eliminate the current practice of changing spool pieces in order to blind the liquid loading and vent hoses. CCR 000082166 AMBIENT AIR ANALYi*J PAGE 2 JULY 29. 1974 A summary of the loading operation with all pertinent data la attached. P. L. Fetzer bo CC: RDG, JAD, GO), JRH OCR 00OO82X6 3 SUMMARY OF RESULTS Niels Henrik Abel Loading 7-28,29-74 Removing Flanges and Connectlug Hoses Century hydrocarbon readings remained below 30 ppm the entire period. The charcoal dosimeter result only showed 1.60 ppm VCM. Heel Samples: Due to the venting of the cargo tanks, the eductor system was back pressured. This resulted In instantaneous exposure up to 1.0J6 on each of the five tanks sampled. The charcoal dosimeter data also showed a higher exposure level, 36.4 ppm VCM. Hydroquinone Addition: Century hydrocarbon readings of the hydroquinone addition procedure remained below 25 ppm. Several valves were leaking around the packing and gave high readings '(1.0JS) at the valve stem. The packing on all valves need checking to determine if replacement is needed. Loading Operation: A survey was made at the request of the dock operators when they smelled vinyl fumes. The area at the base of the dock between the vent recovery and hydroquinone addition unit was monitored. Itydrocarbon readings were obtained ranging between 20 and 400 ppm and verified to be vinyl chloride by column mode operation. An investigation to locate the emission source was unsuccessful although it did reveal the liquid loading hose connection aboard ship was leaking. Vinyl fumes were dissipating to less than 50 ppm a few feet distance (3 to 5) from the flange. Finish Cargo Sampling; The loading was shut down during sampling but the ship continued to vent. The venting again caused the eductor system on the sampling apparatus to back pressure. A higher than normal personnel dosimeter result was obtained during the sampling, 39.9 ppm VCM. The swagelock fitting connections for the sample cylinder on the sampling apparatus needs replacing as they leak. The Centuiy hydro carbon readings were also high when the eductor was back pressured. CCR 000082163 Bose Disconnection and Flange Insertion 4 The flanges were inserted to blind the lines at the dock side valves prior to disconnecting from the ship. No dosimeter data was taken of the operation due to the change in the disconnect routine, Centuiy hydrocarbon readings were obtained and ranged from 15 to 300 ppm. The higher values were instantaneous and the readings quickly dropped to less than 20 ppm. Hydrocarbon readings during the hose disconnecting aboard ship remained below 25 ppm. However when the spool pieces were changed to blind the hoses, the hydrocarbon readings reached 1.0JJ and were near 200 ppm in breathing zone. CCR 000082169 TABLE I PERSONNEL EXPOSURE NIELS HENRIK ABEL LOADING 7-25,29-74 JOB Vent Hose Connection Switching Lines on Ship and Unblinding Liquid Line Heel Sample Hydroquinone Addition Ship Loading Finish Cargo Sampling POSITION Dockman TIME INTERVAL HR 0.30 Dockman 1.12 Shift Foreman Dockman Dockman (A) Dockman (B) Dockman (A) Dockman (B) Shift Foreman 1.20 1.50 2.63 2.22 2,00 2.41 0,60 TWA - PFM - VCM FROM DOSIMETERS 1.80 * 0.18 * 38.46 * 0.21 * 5.64 39.89 1.56 32.44 * * # * 42.25 * * Protected with Fresh Air Mask (A) Dock Shack Area (B) Vent Recovery Area CCR 000032170