Non-PRO English to Arabic Tech/Engineering Energy / Power Generation boilers

The question facing many consulting engineers today is whether to specify on/off operation or modulating continuous feed when boiler size is between 250 and 1200 horsepower. To answer this question, it is important to understand the difference between the two.

Fig. 1 shows a typical on/off piping arrangement for a single- or multiple-boiler application. With this piping scheme, a single- or multiple-pump arrangement (one is standby with manual switching) is dedicated to a single boiler, and its operation is triggered by the low-water-cutoff and pump control on the boiler, which is electrically tied into the pump circuit and actuated when a specific level is reached in the boiler