Simple Things to Remember for Process Design

Test Pressure :

Gas : 1.1 x Design Pressure
Liquid : 1.3 x Design Pressure

Mix Density :

Specific Gravity:

Note: MW air = 28.95

Standard Condition

Pressure (P) = 1 atm = 1.013 bara
Temperature (T) = 16 oC = 60.8 F

Normal Condition

Pressure (P) = 1 atm = 1.013 bara
Temperature (T) = 0 oC = 32

Conversion from Standard condition to Actual condition

P.V = Z.R.T
P.V = constant
( Pstd . Vstd ) / ( Zstd. R. Tstd ) = ( Pact . Vact ) / ( Zact. R. Tact )

Unit:
Depend on R unit. Common R = 0.082 L Atm K−1 mol−1

Pipeline Schedule

For Pressure (P) <> 675 psig à Sch. 80

Pressure Drop

deltaP Control Valve = 0.7 bar
deltaP Heat Exhcanger = for Liquid fluid : 0.7 – 1 bar ; for Gas fluid : 0.2 – 0.5 bar