Calculate minimum safe distances between piping system being pneumatically tested and personnel/plant facilities using ASME PCC-2 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.

### Output

The total pneumatic test pressure volume is ** **

The absolute test pressure in Pascals is ** **

The absolute atmospherice pressure in Pascals is ** 101000 Pa**

The value of Stored Energy in Joules is ** **

The equivalent Stored Energy in kilograms of TNT is ** **

Stored Energy in Joules is calculated using formula

**Stored Energy (E) = 2.5 * P _{t} * V \(\left[1-\left(\frac{P_a}{P_t}\right)^.286\right]\) **..... as per equation II-2 from ASME PCC-2 Appendix 501-II.

where

P_{a} = absolute atmospheric pressure = 101,000 Pa

P_{t} = absolute test pressure

V = total volume under test pressure

Stored Energy in terms of kilograms of TNT is calculated using

**TNT = \(\frac{Stored Energy}{4,266,920}\) (kg)** ..... as per equation II-3 from ASME PCC-2 Appendix 501-II

If E <= 135,500,000 J, the safe distance to be maintained is greater of 30m or R calculated as per equation III-1 below.

If E > 135,500,000 J and less than equal to 271,000,000 J, the safe distance to be maintained is greater of 60m or R calculated as per equation III-1 below.

If E > 271,000,000 J

**Safe Distance (R) = R _{s}(2TNT)^{1/3}**..... as per equation III-1 from ASME PCC-2 Appendix 501-III.

where R_{s} = scaled consequence factor whose minimum value shall be 20m/kg^{(1/3)}.