Propellant supply system

Merz, H. A., "Methods of Quantitative Risk Assessment The Case of the Propellant Supply System," Minutes of the Twenty-First Explosives Safety Seminar, Houston, TX, Aug. 1984, pp. 1485-1506. 

A propellant supply system consisting of all those components necessary to generate and store the propellants prior to introduction into the rocket engines was fabricated and tested. The tests indicated that the three different types of supply systems — blowdown, repressurized, blowdown, and oxygen repressurized — would supply adequate propellant to meet the specified mission objectives. 

FIGURE 12.16 Risk/cost diagram for propellant supply system (DIP = directly involved persons). 

In the case of a liquid rocket (Figure 1.5), the propellant has to be injected into the combustion chamber in a controlled manner. Thus two storage tanks are required for storing the fuel and oxidizer. A supply system to introduce the fuel and oxidizer in controlled quantities in the proper sequence is also an additional requirement. The fuel and oxidizer are to be transferred to the storage tanks only... 

Unit heaters A unit with a large propeller or cenhifugal fan to give high air volume and wide throws. Louvers direct the air flow in the direction required. May be ceiling mounted, discharging vertically or horizontally or floor mounted. Can be used with fresh air Rapid response to conhol by individual thermostat by use of multi-speed motors rapid warm-up available on intermittent systems Altered fresh air inlet facility. Electric supply required for each individual unit. 3 to 300 kW. 

Neutralization of the sulfonic acid and building up with sodium sulfate and tetrasodium pyrophosphate (TSPP) is accomplished in two batch reactors (5 hr cycle) operated alternately. The sodium sulfate is pumped in solution with its transfer pump from the sodium sulfate system (which can be represented by a block). The TSPP is supplied as a solid and is fed by means of a Rcdler conveyor which discharges into a weigh hopper running on a track above the two reactors. Each reactor is agitated with a propeller and a turbine blade in a single shaft. 

The ship has two propellers and two rudders. The propellers were made of nickel-aluminium-bronze alloy (NAB) and modelled as solid disks with a surface area equivalent to the real propellers. The shaft is made of carbon steel and the propellers and shafts were assumed to be uncoated because of turbulence engendered by propeller movement. The ship s hull and rudders are also made of carbon steel, which were coated to prevent corrosion. The ICCP system evaluated included four anodes and a centre controlled power supply. The half of ship BEM model was shown in figure 2. 

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