the trailer on a level surface or ensure thatthe tank has a level attitude. Close all controlvalves on the storage tank. Pressurize theLOX supply tank to the required pressurefor transfer to the TMU 70/M. Removethe dust cover from the supply tank transferline and purge hose. After purging, connectthe fill-drain line coupling (1) (fig. 5-8) tothe transfer hose. Open the TMU 70/M’sstorage tank vent line shutoff valve (5) and fill-drain line shutoff valve (3).CAUTIONPressure should not be allowed to riseabove 55 psi in the storage tank. Monitorthe storage tank pressure gauge (7) closelyduring cooldown.Open the service valve on the supply tankslowly, and allow only a partial flow of LOXthrough the transfer hose and into the trailer.Considerable vaporization will take place until thetransfer hose, fill-drain line, and storage tank onthe trailer have cooled down. When these havesufficiently cooled and are able to handle a fullflow of LOX, open the service valve on the supplytank completely.During filling, LOX flow is through the fill-drain line filter (2) and shutoff valve (3) to thestorage tank. The relief valve (4) is provided toprevent excessive pressure if the fill-drain lineshutoff valve and the service valve on the supplytank are closed with cold gas or liquid trappedwithin the supply line.The relief valve (4) is connected to the ventline for safe discharge overboard. The vent lineshutoff valve (5) is opened during filling andnormal storage where safe overboard dischargeis provide. Storage tank conditions aremonitored and indicated by the liquid level gauge(6) and pressure gauge (7).The inner shell relief valve (8) and rupturedisc (9) are provided in case of excessivepressure in the storage tank. Monitor thestorage tank liquid level gauge (6) duringfilling. When it indicates 50 gallons or LOXstarts to flow out the vent manifold, closethe service valve on the supply tank. Closethe fill-drain line shutoff valve (3) to relieveinternal pressure.CAUTIONUse extreme caution when disconnectingthe transfer hose. Even though the hose hasbeen drained and the pressure relieved,some LOX will still remain. Do not directthe hose toward personnel or otherequipment.Disconnect the supply tank transfer hose,immediately drain the LOX that remains, andreplace the coupling cap loosely. Tighten the capafter ensuring that all LOX has vaporized andbled off. Close all control valves on the servicetrailer except the storage tank vent valve (5).NOTE: Observe the time required to fill theTMU-70/M. Filling will vary with each supplytank and supply line system. Under normal con-ditions and 30 psi transfer pressure, the storagetank should be filled within a period of 5 to 10minutes. Abnormal deviation from the averagefilling time should be cause for investigation.Transfer.— The transfer of LOX from thestorage tank of the trailer to an aircraft convertercan be done in the following manner.Ensure that all safety equipment is in use.Close all control valves (3, 5, 10, 11,20, and 21,as shown in figure 5-8). Observe storage tankliquid level gauge (6) and pressure gauge (7) toensure sufficient LOX supply and safe operatingpressure. Open the transfer tank fill valve (10) andvent valve (11 ) to allow the transfer tank to fill.When the transfer tank is full, as indicated bythe liquid level gauge (13), close valves (10) and(1 1). Connect the converter vent line connector(16) to the converter vent fitting. Connect the AFfiller valve (17) to the converter fill fitting, usinga two-step procedure. First, position the valveagainst the purge fitting and turn the housingclockwise, locking the valve in place. Second, pushthe knurled knob forward and rotate clockwise,locking the valve in the open position. Open thetransfer tank pressure buildup valve (21)momentarily and observe tank pressure gauge(12)When pressure rises to approximately 90 psig,close valve (21 ). If necessary, maintain desiredpressure by regulating pressure buildup valve (21)during converter servicing. Open the convertervent line shutoff valve (20) and observe theconverter full indicator gauge (19). The gauge willindicate GAS as the converter is filling, and whenfull, it will indicate LIQUID.5 - 1 0
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