4.3 Pipework and valves
The general arrangement of LP heater bled-steam pipework is shown in Fig 3.42 and shows clearly the principle of the heaters being below the cylinder bottom level and above the condenser level. The pipework also slopes towards the heater. The bled-steam isolating valves are of the same design as those used in the de-aerator bled-steam pipework. The non-return valves are also similar but are not provided with assisted-closing devices as these are not mandatory for LP heaters.