MDI Transportation Guidelines - Polyurethanes - American ...

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MDI transportation g u i d e l i n e s Suggested Checklist for Rail Tank Car Unloading 1 ____ Refer to the manufacturer’s Material Safety Data Sheets (MSDS) and their technical literature for further information. 2 ____ Spot rail car in a level position. 3 ____ Chock wheels. 4 ____ Set derail and hand brake. 5 ____ Post blue flag “STOP—MEN AT WORK” or “STOP—TANK CAR CONNECTED” sign on tracks. 6 ____ Inspect rail car to make sure it is equipped with the following: • equalization valve. • nitrogen valve. • 2" top and/or bottom unloading valve. • pressure relief valve. • verify dome bolts are tight. • verify that seals are unbroken. 7 ____ Verify that the proper car is on the unloading spot. Carefully check the contents shown on the bill of lading or other documented means (for example: supplier’s certificate of analysis) to verify that the proper product is being offloaded. 8 ____ Check rail car placard for proper identification number (for MDI, this number is 3082). 9 ____ Record initial level on MDI storage tank to verify that it has enough capacity for the entire contents of the car. STORAGE TANK LEVEL: _________ lbs. 10 ____ Check the rail car for the required transfer temperature. • the temperature of the contents can be adjusted by use of the car's heating coils or circulating steam or hot water through the car’s external heating coils. • consult the supplier if MDI has been frozen. (MDI freezes at approximately 55ºF) 11 ____ Check for the required pressure inside the rail car. • if the nitrogen pad has leaked out, contact supplier for further instructions. 12 ____ Check to ensure that an adequate amount of MDI neutralizer (used for spill cleanup) is available in the immediate area. If necessary, make up additional neutralizer batch following the instructions in Addendum 5, Appendix 11. An emergency spill cart should be available in immediate area. 13 ____ Locate the following and verify proper operation: • nearest safety shower and eyewash. • telephone or intercom. 14 ____ Put on personal protective equipment that has been tested and found impervious to MDI (see API technical bulletin AX178): • appropriate respiratory protection. • chemical protective suit. • chemical protective gloves. • chemical protective boots. Appendix 3-2 Copyright 2001, American Plastics Council
MDI transportation g u i d e l i n e s Suggested Checklist for Rail Tank Car Unloading 15 ____ Make sure entire unloading operation is attended as required by 49 CFR § 174.67. It is recommended that two operators be available. For Pump Unloading: 16 ____ Make sure all rail cars valves are closed, and carefully remove the outlet cap or plugs. 17 ____ Connect a 2-inch hose made of a material suitable for transferring MDI, such as Teflon ® fluorocarbon or Viton ® fluoroelastomer from the rail car unloading valve to the 2-inch fitting of the unloading line pump. 18 ____ Connect the 2-inch hose from the rail car vapor exchange connection to the vapor exchange line from the storage tank. 19 ____ Open the valve at the pump and the rail cars unloading valve. 20 ____ Allow the rail tank car pad pressure and liquid head to prime the suction side of the unloading pump. 21 ____ Open the valves on the vapor exchange line and the rail car vapor valve. 22 ____ Start the pump and operate until the rail car is empty or receiving tank is full as indicated by the movement in the unloading line hose and drop in gauge pressure. 23 ____ Turn the pump off and then close the unloading line valves. 24 ____ Blow the lines with nitrogen or dry air and then close the vapor exchange line valves. 25 ____ Disconnect the unloading and vapor exchange hoses, and replace the caps and plugs on pipelines and hoses. Use suitable tool to tighten all caps and plugs. 26 ____ Remove personal protective equipment. For Pressure Unloading: 16 ____ Make sure all rail car valves are closed and carefully remove the outlet caps or plugs. 17 ____ Connect the stainless steel or either Teflon ® fluorocarbon or Viton ® fluoroelastomer hose to the unloading valve on the rail car. 18 ____ Use a 1-inch hose to connect a supply of oil-free, dry air or nitrogen (with dew point of -40ºF) to the rail car air/N2 valve. 19 ____ Pressurize railcar with 35 psi maximum nitrogen or dry air and verify that it does not leak. 20 ____ Open the storage tank vent valve to a suitable vent gas treatment system. Copyright 2001, American Plastics Council Appendix 3-3
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