Tarawa / Wasp Class Assault by John Gourley

By John Gourley

"This is the ""Tarawa/Wasp-class attack Ships in Action"" Warships booklet No. 27 from Squadron/Signal courses writer: John Gourley good points: a superb staple certain

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Heater and drain cooler 4. De-aerator 5. Flash chamber 6. 26 Typical de-aerator (Weir Pumps Ltd) It will be apparent that de-aerators of this type must be installed at such a height in the engine room that the pressure head at the extraction or feed pump suction is greater than that corresponding to the water temperature. 27 is connected to the vapour outlet condensing the vapour vented with the non-condensable gases and cooling these gases before they are discharged. In the process the feed water is raised slightly in temperature.

1. Multi-plate restriction orifice 2. Relief valve 3. Two-way non-return valve 4. Strainer 5. Pressure gauge 6. Balance chamber leakage 7. Leak-off control valve 8. Bearing 9. Balance piston 10. 1st stage impeller 11, 2nd stage impeller 12. Baffle plate 13. Drain valve 14. Drain trap emergency trip acts. An adjusting screw, the collar of which bears against a platform in the casing, is threaded into the upper spring carrier and allows the compression of the spring to be altered by varying the distance between the upper and lower spring carriers.

An adjusting screw, the collar of which bears against a platform in the casing, is threaded into the upper spring carrier and allows the compression of the spring to be altered by varying the distance between the upper and lower spring carriers. The piston, fitted with an O-ring and a spiral back-up ring, slides in a close fitting liner. A flange on this liner locates in a recess in the governor casing cover and is sealed by an Armco iron joint ring. When the pump is started, the throttle valve moves upwards due to the increasing discharge pressure under the piston until the desired pressure is reached.

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