Column base with isolated internal reboiler be used instead. Here each reboiler is supplied from a valve connected directly to the high-pressure header. This saves one valve and controller and the higher pressure drop means smaller valves. There is more likelihood of critical pressure drop, and less probability that flow regimes will switch during normal operation (see Section 4.2). This figure also illustrates temperature and pressure compensation of the steam flow meter. Header pressure and temperature variations severely impair the accuracy of many uncompensated plant steam flow meters. A suitable scheme for temperature and pressure compensation is given in Chapter 11. Errors in steam-flow metering without such compensation are also discussed.

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