Calculate minimum safe distances between piping system being pneumatically tested and personnel/plant facilities using ASME PCC-2 (2022 Edition) Mandatory Appendix 501-II and III equations. For details on the basis of this calculation and example manual calculation refer to the article on Pneumatic Testing - Safe Distances.
The calculation is based on air or nitrogen being used as test medium with specific heat ratio of k = 1.4.
Safe Distance & Stored Energy Calculator — Pneumatic Pressure Test
ASME PCC-2 2022 | Mandatory Appendix 501-II & 501-III | Air or Nitrogen Test Medium (k = 1.4)
Project Information
Unit System
All stored energy calculations use SI equations (Eq. II-2 & II-3) internally. US Customary values are converted equivalents shown for reference.
Pipe Size & Wall Thickness
Select Nominal Pipe Size and Schedule / Wall Thickness
Select pipe size and wall thickness above.
Piping System & Vessel Data
Piping Length
Piping volume will be capped at length = 8 × pipe OD per ASME PCC-2 2022 Appendix 501-II.
Vessel Volume (Optional)
For a vessel, total volume shall be considered (ASME PCC-2 2022 para. 501-II). Enter 0 or leave blank if no vessel.
Test Pressure
Gauge pressure. Absolute pressure = Gauge + atmospheric (101 kPa SI / 14.7 psia US).
Blast Wave Distance — Rscaled Selection
Select Rscaled — Table 501‑III‑1‑1 (ASME PCC-2 2022)
Default minimum value of Rscaled = 20 m/kg1/3 (50 ft/lb1/3) shall be used per Appendix 501-III-1. An alternative lower value may be selected only when the minimum calculated distance cannot be obtained. See also para. 501-6.2(g).
Table 501‑III‑1‑1 — Alternative Values for Rscaled
| Rscaled m/kg1/3 |
Rscaled ft/lb1/3 |
Biological Effect | Structural Failure | Notes |
|---|---|---|---|---|
| 20 | 50 | — | Glass windows | Default minimum value per Appendix 501-III-1 |
| 12 | 30 | Eardrum rupture | Concrete block panels | Alternative if minimum distance unachievable |
| 6 | 15 | Lung damage | Brick walls | Minimum to prevent lung damage |
| 2 | 5 | Fatal | — | — |
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Safe Distance & Stored Energy Calculator — Pneumatic Pressure Test
ASME PCC-2 2022 — Mandatory Appendix 501-II & 501-III | Air or Nitrogen (k = 1.4) — Printed:
📋 Project Information
⚙ Input Data Summary
✅ Calculation Results — ASME PCC-2 2022 Appendix 501-II & 501-III
| Parameter | Units | Calculated Value | Reference / Remarks |
|---|
💣 Fragment Throw Distance — Table 501‑III‑2‑1
Minimum Fragment Throw Distance (per Table 501-III-2-1)
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Note (ASME PCC-2 2022, Appendix 501-III-2):
When fragments of vessel or piping are at risk of being created and impacting personnel, the minimum distance between all persons and the equipment being tested shall be as shown in Table 501-III-2-1 of ASME PCC-2. If the distances in Table 501-III-2-1 are not achievable, the distance may be evaluated using methods available in the public domain.
When fragments of vessel or piping are at risk of being created and impacting personnel, the minimum distance between all persons and the equipment being tested shall be as shown in Table 501-III-2-1 of ASME PCC-2. If the distances in Table 501-III-2-1 are not achievable, the distance may be evaluated using methods available in the public domain.
📝 Notes, Assumptions & References