Drawings / Example loops
Example control loops
Six teaching loops for the Gulf Coast Example Plant. Each page has an original SVG, a tag list, how the loop works and the SAP PM planning angle.
Flow control loop Orifice and transmitter to DCS controller to I/P and control valve on a feed line. FT-1001 · FIC-1001 · FY-1001 · FV-1001 Level control and high trip Drum level control with a separate high high level switch that trips inlet. LT-1101 · LIC-1101 · LV-1101 · LSHH-1101 Pressure loop with PSV Pressure control on a vessel with a spring loaded relief valve to flare or safe location. PT-1201 · PIC-1201 · PV-1201 · PSV-1201 Temperature control loop Thermocouple or RTD through transmitter to controller and a temperature control valve. TE-1301 · TT-1301 · TIC-1301 · TV-1301 Motor start stop circuit Hand switch, MCC starter, run status light and overload protection for a pump motor. HS-1401 · M-1401 · XL-1401 Simple SIS trip loop 2oo3 pressure sensors to safety logic to a trip valve, separate from the BPCS loop. PT-1501A · PT-1501B · PT-1501C · UY-1501 · UV-1501