TLV is pleased to announce the release of the Extended Stall Chart Calculator (ESC) on www.TLV.com. The ESC was first released in Chemical Engineering magazine, November 2004, and republished in Chemical Engineering Progress magazine, July 2021.

 

The ESC charts the estimated pressure profile supplied by an inlet steam control valve to estimate the demand load percentage where the HX equipment outlet pressure is equal to the system back pressure. That intersection is the Stall Point upon which either sufficient fill head over a trap is needed to discharge condensate, or a pump or pump/trap system is needed to discharge condensate into a pressurized return line or lift.

The ESC Stall Point calculator and related webinars can be accessed at the following links:

• Calculator: Stall Point
• "Eliminate Condensate Bottlenecks in Reboiler Discharge" Webinar Recording
• "Designing Condensate Drainage from Reboilers" Webinar Recording

An explanation for using the stall calculator is attached.

Symbol	Input Data
P1	Pressure before the ISC valve
P2	Pressure exiting the control valve and entering the reboiler/heat exchanger/coil
P3	Exit steam pressure at the inlet of the steam trap after incurring pressure drop in the reboiler/heat exchanger/coil (plus head)
P4	Backpressure against which the trap must discharge

The stall point results are displayed with oversurfacing and without.

• Extended Stall Chart Calculator

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