Document v5pEZ5ygwBdez10jBgdQodO8

TO: DISTRIBUTION ATTENTION: FROM,W. C. Douglas DATE: October 21, 1974 SUBJECT: VINYL CHLORIDE MONITORING Attached is a pump calibration procedure for your use in personnel monitoring. It may also be used to calibrate your pumps for air samples via glass sampling tubes. WCD/byo Attachment Distribution: Columbus Jeannette Toledo Lawrence Reading Troy Orange Newcomerstown Newnan Tech. Serv. Pilot Plant Marion Styling Wabash - J. Pope M. Vickery R. Colburn - A. Colecchia J. Shedrick F. Altman - J, Simens J. Townhill F. McGranaghan - J. Esile R. Pecci - M. Henriksen S. Lange - W. Walsh P. Watta - R. Walker D. McNeil - C. Hefner S. Resan J. McClure - C. Leypoldt D. Thole - J. Gyenge J. Harrington - V. Karl G. Cabaniss - J. Monts G. Gelvin - P. Bender - L. Ericson P. Magner R. Mitten William C. Douglas Corporate R&D - R. Briggs P. Taylor G. Frisone cc: VC1 Committee "BETTER Service Is Our Business GENC Oil 594 Personnel Monitoring Pump Calibration and Use There are currently seven pumps which can be used for personnel monitoring of vinyl chloride. They are the Bendix Micronair and C-115 models, the MSA (Model G), the Sipin (SP-1, SP-2, SP-2P), and the National Mine Service Model 222-3. Each of these pumps is a variable vacuum pump designed to draw air from the test location at a set rate for a time period of up to 8 hours. For monitoring vinyl chloride, a rubber or plastic hose is attached to the pump inlet, with a charcoal tube at the other end of the hose. The tips of both ends of the charcoal tube are broken off so that the air sample may be drawn through the charcoal where organic vapors are trapped for subsequent analysis. To use any of these pumps and obtain mean ingful data, you must adjust their flow rates to the proper level and check this flow rate before and after monitoring so as to calculate the air flow through the charcoal tube. For 8 hour testing, the 100 mg sample layer of the tube contains enough charcoal to adsorb slightly over 1 ppm vinyl chloride from the air, if the flow rate is 100 ml/minute. Thus, if you are within the Standard's requirements of 1 ppm, you can use a single tube on a shift at a 100 ml/minute flow rate and establish your level. Should you have 3 ppm average in the test area, and run at this flow rate, the back up charcoal layer will absorb some of the vinyl chloride and some will be lost, invalidating your test. As long as you are operating near this range of flow rate, any arithmetic combination of flow, VC1 adsorbed, and time, will be applicable. For example, the tube should operate to a maximum of 1 ppm at 200 ml/minute for 4 hours, or 2 ppm at 100 ml/minute for 4 hours, etc. High rates of flow, such as 1.5 to 2*0 liters/minute are not recommended since the high flow rates may enable some VC1 to pass through the tube without being adsorbed. Following is a summation of each pump and a recommended procedure for calibrating it to the desired flow rate (preferably 100 ml/minute). General Tube Precaution When breaking off the tube ends, it is possible to leave small pieces of broken glass on the tube which can become sucked into the pump, subsequently cutting the diaphragm. Always check the tube carefully to be certain that the breaks are clean. Bendix Micronair The flow meter on the side of this pump is useless for calibrating flows in the 100 ml/minute range. It should be calibrated externally. To assist your calibration, we are obtaining for each plant, a rotameter (Dwyer VFA-21) in the range of 60-500 ml/ minute. Each rotameter will be checked in Akron for accuracy and recalibrated for your use. This device will be your standard method of adjusting your pump to 100 ml/ minute, and checking before and after monitoring, the flow rate obtained. To adjust the Micronair, attach the hose and charcoal tube to the pump and switch on the motor. To the inlet end of the tube, attach a small rubber hose not over 6" long which is attached to the top of the rotameter. With a screwdriver, regulate the pump speed until the actual flow rate from the calibration is 100 ml/minute. Disconnect the charcoal tube from the rubber hose on the flowmeter. The pump with the connected charcoal tube is now calibrated and ready for monitoring. GENC Oil595 Page 2 Bendix C-115 The same general procedure applies as for the Micronair. This pump is too large to turn down to 100 ml/minute as produced by the factory. A simple modification to the pump will enable it to run in this range, however. By placing a one inch long hose on the pump outlet, and a hose clamp on this hose, you can throttle down the pump with the hose clamp and external screw control. All C-115 pumps which you will receive from Akron will be modified in this manner for your use. The rotameter calibration technique is the same as for the Micronair pump. MSA Model G Our experience is that this pump can be throttled down to the desired rate by following the recommended Micronair pump procedure. Sipin SP-1, SP-2, and SP-2P These pumps differ in flow rate and delivery. The SP-1 has an adjustable flow of 50 to 200 ral/minute; the SP-2 has a range of 25 to 100 ml/minute; both are vacuum pumps only. The SP-2 can be used both as a vacuum pump and to fill a sample bag with test air. They can be adjusted with the flow control valve, according to the calibration provided with the pump. They cannot be adjusted with the rotameter because they are stroke pumps and the rotameter indicator will pulsate wildly with the plunger stroke. Once the stroke volume has been determined, however, the number of strokes times the stroke volume should yield reproducible sample volumes. 0SHA requires recalibration of this type of pump in mine air sampling every 200 hours of operation, and this frequency of cali bration is recommended for your use. A soap bubble calibration device is ideal for this purpose; #307-100 Flowmeter with Adapter ($28.50) is recommended from Environmental Compliance Corporation, P.0. Box 44 - Venetia, Pennsylvania 15367 412/922-4646. Also, at least once per day, the Sipin pump should be connected to the rotameter to confirm that the diaphragm has not been damaged, and that the pump is still drawing air. National Mine Service #222-3 This model appears similar to the Sipin. Ones on order have not yet been received. WCD/byo GENC Oil594