Method for twin screw positive displacement pump protection

A method comprising:

• receiving with a signal processor signaling containing information about power, torque, speed, viscosity and specific gravity related to the operation of a twin screw positive displacement pump;
• and
• determine with the signal processor whether to enter an enhanced pump protection mode for the twin screw positive displacement pump based at least partly on a relationship between an actual corrected tune ratio and a tuned ratio set point (Tune Ratio SP).

A method according to claim 36, wherein the method comprises determining with the signal processor the corrected torque reading for specific gravity and viscosity based at least partly on the equation:

• TACT1CORR=TACT×(SGRTD/SGACT)/(VISCACT/VISCRTD)0.275.

A method according to claim 36, wherein the method comprises updating with the signal processor the value of TACT1CORR under the following conditions:

• when +/− a predetermined rpm speed change occurs, during pump start-up and after a predetermined operating time elapses.

Apparatus comprising:

• means for receiving signaling containing information about power, torque, speed, viscosity and specific gravity related to the operation of a twin screw positive displacement pump;
• and
• means for determining whether to enter an enhanced pump protection mode for the twin screw positive displacement pump based at least partly on a relationship between an actual corrected tune ratio and a tuned ratio set point (Tune Ratio SP).