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2.3.3 2.3.4 2.3.5. Loading a Transport Using: a Plant Pump (2.3.3) a Plant Compressor (2.3.4) , a CTMV Pump (2.3.5). Following the proper procedures for filling transports is essential to a safe and efficient loading operation. In these modules you will learn to identify:
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2.3.3 2.3.4 2.3.5 Loading a Transport Using: a Plant Pump(2.3.3) a Plant Compressor (2.3.4), a CTMV Pump (2.3.5) Following the proper procedures for filling transports is essential to a safe and efficient loading operation. • In these modules you will learn to identify: • Attendance requirements during the loading process • Safety procedures to apply during the loading process • Steps for propane transfer using the plant pump (2.3.3) • Steps for propane transfer using the plant compressor (2.3.5) • Steps for propane transfer using the trailer pump and through the cargo tank auxiliary pump inlet (“self-loading” 2.3.5)
U.S. Department of Transportation regulations require that qualified persons be “in attendance” throughout the process of loading a cargo tank motor vehicle. • The person who is responsible for loading the cargo tank is also responsible for ensuring that it is so attended. • A person is “qualified” if he/she • has been made aware of the nature of the hazardous material • has been instructed on the procedures to be followed in emergencies • is authorized to move the cargo tank • has the means to do so . Loading Attendance Requirements
Loading Attendance Requirements • Identifying Safety Procedures During the Loading Process— in addition to the regulatory requirements, the person performing cargo tank loading operations should be: • In a position to monitor the filling of the cargo tank • Alert for any abnormal operating condition or emergency • Aware of the activities of other persons in or near the transfer area • In a location that allows for quick response to abnormal operating conditions or activation of emergency shutdown systems, and rapid evacuation from the area should the need arise.
Loading Attendance Requirements • Proper and safe procedures prior to the filling operation include: • Before moving the vehicle to the loading bulkhead, check for any obstacles that might create an unsafe condition. • Remove the chock blocks from the wheels and store them temporarily on the vehicle. • Check the PTO to ensure it is disengaged. • After starting the engine, ensure all instrumentation indicates normal operation.
Loading Attendance Requirements • Proper and safe procedures prior to the filling operation include: • Position the transport at the loading bulkhead in a way that maximizes the shearing effect of the hoses and piping should a pull-away occur. The fill connection on the cargo tank should be at least 10 feet from the nearest bulk storage container. • Engage the parking brake and turn off the engine. • Place chock blocks in front and behind a rear wheel to prevent movement.
Fixed Maximum Liquid Level Gauge Figure 1. Fixed Maximum Liquid Level Gauge Using the Plant Pump to Fill the Cargo Tank
Variable Liquid Level Gauges Figure 2. Rotary Gauge Using the Plant Pump to Fill the Cargo Tank
Using the Plant Pump to Fill the Cargo Tank • Temperature and specific gravity are essential when using a rotary gauge. The temperature of the propane can be determined from the thermometer installed in the supply container. The specific gravity can be obtained from the plant receiving records. If the specific gravity information is not available, use 0.508 as the specific gravity for propane. • When rotary gauges are set, they operate the same as fixed liquid level gauges. During the filling operation, propane vapor vents through the dip tube and bleeder valve into the atmosphere. When the liquid in the cargo tank reaches the bottom of the dip tube, a steady stream of white mist sprays out of the bleeder valve, indicating the maximum permitted filling level has been reached.
If the specific gravity of the propane liquid is 0.508 and its temperature is 60°, by setting the indicator arm so that it crosses the set point, the maximum filling level of 88% is indicated. Figure 3. Rotary Gauge Face Using the Plant Pump to Fill the Cargo Tank
The float gauge consists of a float in the container that moves up and down with the liquid. The filling operation is stopped when the pointer indicates it has reached the set point on the gauge face. Figure 4. Cargo Tank Float Gauge Face Using the Plant Pump to Fill the Cargo Tank
Figure 5a. Excessive Thread Wear Figure 5 b. New ACME Thread Profile & Worn ACME Thread Profile Using the Plant Pump to Fill the Cargo Tank
Using the Plant Pump to Fill the Cargo Tank If for any reason the transfer operation is interrupted, or the attendant must leave the area, the pump must be shutdown and transfer hoses disconnected. DO NOT leave transfer hoses connected to the cargo tank while unattended by a qualified person.
Using the Plant Compressor to Fill the Cargo Tank Figure 1. Compressor and Bulk Plant Connections
Using the Plant Compressor to Fill the Cargo Tank Figure 2. 4-Way Valve Positions
Using the CTMV Pump to Load (2.3.5) Position the Transport Figure 1. Transport Position for Self-Loading
Using the CTMV Pump to Fill the Cargo Tank Set the Liquid Level Gauges on the Cargo Tank The temperature and specific gravity of the propane are essential to the use of a rotary gauge for determining a permitted filling level. The temperature of the propane can be determined from the thermometer installed in the supply container. The specific gravity can be obtained from the plant receiving records. If the specific gravity information is not available, use 0.508 as the specific gravity for propane. If the set point for a rotary gauge or float gauge cannot be determined, the fixed maximum liquid level gauge must be used to determine the maximum filling level.
Using the CTMV Pump to Fill the Cargo Tank Steps in the Product Transfer Operation Figure 6. Connecting Tractor PTO Output Shaft & Trailer PTO Input Shaft
Using the CTMV Pump to Fill the Cargo Tank • Precautions • Hand-tighten hose connectors, then tighten as necessary with a spanner wrench, tapping the spanner wrench handle with the palm of a gloved-hand. • Examine the condition of the O-ring or flat gasket in the cargo tank filler adapter. Replace it as needed. • If either set of threads is excessively worn to the point that the connection leaks with a new O-ring or gasket, replace the worn fitting or adapter before proceeding with the loading operation.
Using the CTMV Pump to Fill the Cargo Tank To ensure that a pump-actuated pressure differential internal valve remains in the closed position before and after the PTO is engaged, it may be necessary to place the three-way toggle valve handle into its emergency shutdown position. Refer to Figure 9.
Using the CTMV Pump to Fill the Cargo Tank Figure 9. Pump-Actuated Pressure Differential Internal Valve—Slotted Indicator Across Flow Shows the “Valve Closed Position”
Using the CTMV Pump to Fill the Cargo Tank Figure 10. Engaging the PTO
Using the CTMV Pump to Fill the Cargo Tank • Be sure you know: • your company’s policies and standard operating procedures • how to react in the event of an abnormal operating condition or emergency.
Time to See If You Got the Key Points of This Module… • Complete the Reviews for each of the loading modules. • See if you are ready for the Certification Exam by checking off the performance criteria at the end of each module.
