Process descripton for the RR1 example simulation

The process consists of the following:

• Piping from each pass outlet in the vacuum charge heater to the vacuum transfer line.

• The vacuum transfer line that feeds into the vacuum column flash zone.

• Pipe enlargers that periodically increase the diameter of the vacuum transfer line to limit the approach to critical flow.

  The following table outlines the design requirements for the vacuum transfer line:

  Specification	Variable	Value (SI)	Value (US Refining)	Comments
  Total Flow	W	97500 kg/hr	214,950 lb/hr
  Flash Zone Operating pressure		35 mmHg	35 mmHg
  Maximum approach to critical velocity		85%	85%	Avoid critical velocity at any location in the vacuum transfer line. High velocity results in liquid entrainment.
  Distance from fired heater to vacuum column.		152.4 m	500 ft
  Charge heater maximum outlet temperature		404°C	760°F	Avoid high temperature to prevent cracking and coke formation.
  Vacuum column inlet temperature		395°C	735°F