This partial calculator converts entered steam gauge pressure to absolute pressure, evaluates the NIST water-vapor Antoine correlation, subtracts an entered cold-spot difference, and compares that selected temperature with an entered target. It does not establish cure time, cure readiness, uniformity, vessel safety or product quality.
Steam Vulcanizer - Selected Saturation/Temperature Ledger
Explore a NIST water-vapor saturation correlation and entered temperature differences.
Equation Used
- Steam gauge pressure, target temperature and cold-spot difference are entered values.
- One standard atmosphere equals 1.01325 bar.
- The cited NIST Antoine coefficients are used only within their stated 379–573 K range.
- Cold-spot temperature is correlated saturation temperature minus an entered difference, not a prediction.
- Cure kinetics, measurement, vessel design and safety are excluded.
The secondary figure is an abstract temperature ledger, not a vulcanizer design.
Selected saturation/temperature ledger
One standard atmosphere is added to entered gauge pressure. The NIST water Antoine correlation valid from 379 to 573 K is inverted for saturation temperature. The entered cold-spot difference is then subtracted, and the result is compared arithmetically with the entered target.
What the calculator determines
Use it to inspect the stated correlation and selected temperature differences only. It cannot define or validate a vulcanization cycle.
Selected relationships
P_abs=P_g+1.01325 bar; T_K=643.748/(3.55959-log10(P_abs))+198.043; T_cold=T_sat-dT; selected delta=T_cold-T_target.
Selected-input example
At 6 bar gauge, 165 degrees C target and zero entered cold-spot difference, the ledger reports the NIST-correlated saturation temperature, the same selected cold-spot temperature and its arithmetic difference from target.
Not a cure or vessel model
Steam quality, heat transfer, part geometry, thermal lag, compound kinetics, rheometer data, cure time, instrumentation uncertainty, pressure-vessel design and safety are excluded.
Questions
Does reaching the entered target mean cure timing can start?
No. That requires a validated process specification and actual calibrated measurements.
Is the cold-spot temperature predicted?
No. It is the correlated saturation temperature minus an entered difference.
Why was the 170-degree margin removed?
The source treated 170 degrees C as a general threshold without a compound-specific basis.
Authoritative references
- NIST Chemistry WebBook: Water Antoine Parameters — gives log10(P)=A-B/(T+C), including A=3.55959, B=643.748 and C=-198.043 for 379–573 K with pressure in bar.
- NIST Guide to the SI, Appendix B — defines one standard atmosphere as exactly 101325 Pa.
References & Further Reading
- Wikipedia contributors. Vulcanization. Wikipedia
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