Description
Vessel Nozzle Reinforcement UG-37 Calculation
Engineering Spreadsheet — Instant Download
What This Spreadsheet Does
Calculates pressure vessel nozzle reinforcement per ASME Section VIII Division 1 paragraph UG-37 using the area-replacement method. Determines whether shell, nozzle, and weld provide adequate reinforcement, or whether a reinforcing pad is needed — and sizes the pad if so.
What’s Inside the Excel File
- Inputs — vessel OD and thickness, nozzle OD and thickness, design pressure, temperature, material allowable stress (shell, nozzle, pad), joint efficiency, corrosion allowance
- Required area (A) per UG-37(a)
- Available area in shell (A1) from excess thickness
- Available area in nozzle wall (A2) from excess thickness
- Available area in nozzle protrusion (A3) inside vessel if applicable
- Available area in weld (A4)
- Required reinforcing pad area (A5) if A1+A2+A3+A4 < A
- Pass/fail flag and pad dimensions
Who This Is For
- Pressure vessel design engineers
- Mechanical engineers on ASME-stamped vessels
- EPC mechanical teams
- Vessel fabricators verifying nozzle reinforcement
Codes & Standards Referenced
- ASME Section VIII Division 1
- UG-37 — Reinforcement Required for Openings in Shells and Formed Heads
- UG-45 — Nozzle Neck Thickness
How It Works
| 1 | Purchase — secure payment |
| 2 | Download — instant Excel access |
| 3 | Enter Values — vessel and nozzle data |
| 4 | Get Results — reinforcement check with pad sizing if needed |
File Format & Compatibility
Microsoft Excel (.xlsx). Opens in Excel 2016+, Excel 365, Google Sheets. No macros, no locked cells.
What You Get After Payment
- ✅ Instant download (also emailed)
- ✅ Lifetime access
- ✅ Engineer email support
- ✅ 7-day refund if file fails to open
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Frequently Asked Questions
Set-in or set-on nozzles?
Both — toggle nozzle attachment type. The available area calculation differs slightly.
Multiple nozzles close together?
This sheet does single nozzle. Adjacent nozzles within 2(d+t) require interaction check.
Custom version needed?
Request a custom quote.
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