Drain Procedure

[MacProcess]

Hi.



I wonder how can drain the refineries when shutdown.



1. After shutdown, pump out hydrocarbon liquid as much as you can.

2. Then, How can we drain the remained hydrocarbon liquid in line?

For most equipment, closed drain is connected at low point.



But for lines, closed drain connections at every low points are required?

or draining liquid using nitrogen or something?



If we can use nitrogen, how can we decide closed drain points for lines?



Thank you.

[Eneas]

Please a I need it too!