ISA 77.43.01-2014 PDF Download

The ISA 77.43.01-2014 standard focuses on the unit/plant demand development subsystem for boilers with steaming capacities of 200,000 lbs/hr (25 kg/s) or greater. This standard aims to address various aspects of this subsystem, including generation demand, boiler demand development, turbine demand development, throttle/header pressure control, and unit megawatt/steam flow control (where applicable).

The standard specifically covers two types of process applications: a single boiler supplying a single turbine, which is typical of an electric utility power plant; and a single boiler or multiple boilers supplying a common distribution header, which is typical of an industrial power plant.

However, the standard excludes several factors from consideration, including dispatch control, turbine/generator control (except turbine demand), feedwater controls, steam temperature controls (which are covered separately), combustion controls (also covered separately), steam distribution control systems, economic loading of boilers, and fluidized bed boilers.

The purpose of this standard is to establish the minimum requirements for the functional design specifications of the unit/plant demand development for control systems in fossil-fueled power plant boilers. By providing these specifications, the standard aims to ensure that the control systems for these boilers are designed and implemented effectively and efficiently.