COLDCALCS

Preliminary sizing for engineering evaluation only. Not for construction. All results must be independently verified by a qualified engineer against the applicable code edition.

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Thermosyphon / HPR Sizer Pro

Engineering Selection Tool v0.6.0

Loading CoolProp…
Configuration
Vessel type
Orientation
Sizing data
Fluid

Loading refrigerant-property engine (CoolProp WASM)…

High side / condenser (MAWP basis)

Blank = 95°F default (1% design dry-bulb).

Blank = 300 psig default floor.

IIAR 2: design temp = site ambient + 30°F; MAWP = greater of saturation pressure at design temp or the floor above.

Added to shell & head thickness before plate rounding.

Ready to size

Select your vessel type and enter load/charge conditions, then select Calculate to generate an engineering selection.

Methodology references

  • ASME BPVC Section VIII, Division 1 — UG-27 (cylindrical shell, internal pressure) and Appendix 1-4 (2:1 ellipsoidal head, internal pressure)
  • ASME VIII UG-37 (nozzle reinforcement) — this tool prints a reinforcing-pad callout only, not a full UG-37 area-replacement calculation
  • ASME VIII UG-125 (pressure relief) — this tool does not size the relief device; a code relief device is always required
  • IIAR 2 — high-side design-pressure/MAWP basis (condenser type, site design ambient, per-fluid MAWP floors) and the requirement for a code relief device
  • Refrigerant saturation properties are sourced from a live CoolProp engine (WebAssembly build), not a static hand-typed table