Hydro Test / Pneumatic Test — Calculation Verification Aid
Important Limitation:
This tool provides a calculation-based recommended minimum safety distance and supports verification against the entered distance verification criteria. The final field application shall consider project/client requirements, projectile assessment, PTW, JHA, SIMOPS assessment and approval by the Responsible Supervisor or other competent person.
Hydro Test Input Values
bar(g)
mm
m
kg/m³
Distance Verification Criteria
Optional criteria used for verification status. The highest entered value among these criteria is compared with the calculation-based recommended minimum safety distance.
Hydrostatic calculation is retained as a legacy Lloyd’s Register 96-02 / T-0240 based verification aid. It shall not replace engineering review. Trapped air, end-cap/blind failure, line-of-fire, hose whip, supports, anchors, SIMOPS and public interface must be assessed separately.
Optional criteria used for verification status. The highest entered value among these criteria is compared with the calculation-based recommended minimum safety distance.
m
m
m
ASME PCC-2 Basis
V = π × (Di / 1000)² / 4 × Li, unless known total volume is entered.
Pat = Pt(gauge) + Pa, in absolute pressure.
E = [1 / (k − 1)] × Pat × V × [1 − (Pa / Pat)((k−1)/k)]
For air or nitrogen where k = 1.4: E = 2.5 × Pat × V × [1 − (Pa / Pat)0.286]
TNT = E / 4,266,920 kg
R = Rscaled × TNT1/3
ASME PCC-2 Article 5.1 Mandatory Appendix III requires the personnel distance to be the greater of the energy-band minimum distance and the scaled distance equation. Default Rscaled is 20 m/kg1/3. For E > 271 MJ, the distance is calculated by the equation and additional risk evaluation / engineering review is required.
Final Field Application Rule: The exclusion zone applied on site shall consider the calculation-based recommended minimum safety distance, project/client minimum requirement, JHA result, SIMOPS restriction, fragment/projectile assessment, and Responsible Supervisor / competent person approval.
Important Limitation: This report verifies the calculation-based recommended minimum safety distance against the entered project/client requirements, projectile assessment and proposed exclusion zone. Final field application shall be confirmed by the Responsible Supervisor or other competent person before the pressure test.
