1 reply to this topic

[rabindra]

Hello

 

During an discussion with my boss, I came across an easy way to calculate the hold up volume of a pipeline (with an error of 2%). Just thought sharing it.

 

Holdup volume of a pipe (m³) / per Kilometer = 0.5 x (Pipe Size in inch)²

 

Example:

 

Calculate holdup volume of a 12" pipe of length 3 Kilometers:

 

Holdup volume per Kilometer = 0.5 x (12)² = 72 m³ / per kilometer

 

Holdup Volume for 3 KM length = 72 x 3 = 216 m³

 

Exact calaculation will be = 3.142 x (10 x 0.025)² x (1/4) x 3000 = 212 m³

 

% Error = (4 / 212) x 100 = 1.88 %

 

Requesting other members to share similar shortcut calculations.

 

regards

rabindra

[katmar]

Instant steam tables:

 

Take the fourth root of the pressure in bar absolute and multiply by 100.  This gives the saturation temperature in degrees C

 

Example: 

    4 bar g steam is 5 bar abs.  5 ^0.25 = 1.495

    1.49 x 100 = 149.5

    From steam tables saturation temperature is 151.8 deg C

 

An easy way to take the fourth root is to press the square root button twice.