Tulsa Heaters, Inc. has an ongoing commitment to continuously improve its engineering and design software. THI has developed a library of computer programs that empower our engineers to build more accurate models, make better design decisions and develop products that provide the owner with greater operating flexibility and lower costs (both capital and operational).
From the calculation of process flow regimes to the hydraulic balance of an APH system to the determination of combustion gas compositions, THI has consistently committed resources to the development and enhancement of rigorous design software. This commitment pays dividends that every owner will realize in greater design accuracy, lower operating risk, higher product quality and better overall performance.
. . . with Field-Proven Accuracy
This set of proprietary programs allows THI's engineers to accurately model a full array of heater design parameters: fuel combustion, firebox temperature, radiant and convective (row-by-row) heat transfer, process pressure drop, film temperatures, tube metal temperatures, flue gas pressure drop and stack draft. The radiant modeling programs are specific regarding heater coil geometry: vertical or horizontal cabin, single or double-fired and wicket, serpentine or helical coil layout. Verified by operating data from hundreds of heaters in the field, these computer models are some of the most reliable in the industry.
Pseudocomponent Multiphase Fluid Model
This process fluid-based heater model provides simultaneous energy and mass balances around defined coil segments, calculating all key variables for each segment: fluid temperatures (bulk and film), pressures, vapor fractions, densities (vapor, liquid, and bulk), internal coefficients, linear and critical velocities and coil temperatures. Inputs include process fluid properties (ASTM D86/TBP data and/or user-defined components) and heater coil configuration. This proprietary program also uses proven correlations in its calculations, including a modified S-R-K equation of state.
THI’s proprietary Cracking/Coking Program also provides simultaneous mass and energy balances on the process fluid throughout the heater coil. A key feature of this code is the ability to rigorously calculate the percent of coked and cracked material formed (at each segment and cumulative), leading to a design in which the owner can have great confidence. The program calculates the same set of process variables as the THI Multiphase Fluid Model, plus bulk and film residence time above 800°F, and the cumulative and segment coking factors.
Mechanical Design Program Set
THI's structural design engineers also have a slate of powerful programs at their disposal, including:
RISA 2D and 3D
Stack Design Program
Terminal Load Evalution
Tube Support Design
Lifting Lug Design
Baseplate & Lug Design
ASME Code Calculations
Vertical Heater Structure Design
Wind & Earthquake Loading
Once a heater is designed, general arrangement drawings are produced in a state-of-the-art rotation CADD® system (with AutoCad® conversion capability). THI’s drawings and calculations be transmitted to customers in either printed or electronic format.