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Cement-based vessels can meet the pressure vessel standards in some countries, with a maximum allowable working pressure (MAWP) of 75 MPa or 20 bar, and a maximum working temperature of 120 °C (250.2 °F/266.7 °F) or 100 °C (212.2 °F) above the design metal temperature (the lowest operating temperature of the vessel outer surface material). Some countries have earthquake-resistant vessels such as Hong Kong, Japan, and Singapore that can withstand earthquakes and shear forces applied to the vessel by strong ground motion. One important factor is that there can be no less than one fifth of the wall thickness of the concrete, and typically the vessel has a thickness of two to three times the concrete thickness. Thus, increasing the thickness of the concrete is one way to increase the earthquake resistance of the vessel. For example, a concrete wall thickness of 25 mm (1 in.) will have better resistance than a 100 mm (3.9 in.) thick concrete wall. The thicker the concrete, the greater the resistance. Because the vessels are made from concrete, they have high levels of insulation, usually 4 to 9 m (13 to 29 ft), which reduces the amount of heat exchange with the outside environment. In general, the thickness of the cement concrete has no effect on the thermal strength of the steel. Manufacturers can use admixtures to improve the thermal properties of cement concrete. For example, the thermal conductivity and the thermal expansion coefficient of the cement concrete can be increased.

Pulverized fuel oil fire engines represent a pressure vessel assembly composed of steel components that replace the conventional steel of the older fire engines. Conventional design engineering of fire engine components typically requires the following: 1) checkmate drawings, 2) critical parameter charts, 3) drawings and specifications for seals and gasket material, 4) dimension drawing, 5) whether existing or new, weight and metric computation, 6) specification drawings, 7) certification of welds, provisions, and procedures, 8) paint selection. All these jobs are done in the fire engine manufacturer. However, pulverized fuel oil fire engines are just a simple steel pressure vessel. Thus, there are no engineering and certification requirements. d2c66b5586