Blowdown PSV

I can't sleep again, till this midnight , almost 00.00 PM (or AM ? ), I just confuse what to do. I think it will better for me to do something useful. But what ? I don't get any idea. Until finally, I remember this blog.
My blog save my brain :D.

Usually, when I don't know what to do, the most often I decide is check my facebook, just want to know my friend's status.

Oh My God,,why I share my feeling to you.,I should share my knowledge instead of my feeling, right ? I am so sorry.

My friend,there are many terminology related to PSV. I give you a summary as following picture.

Please comment to this posting for only item which you don't understand :D,
I will answer your question later.

ho,, ho,, sorry for this disappointed posting,,hopefully you understand me, I am afraid will make many mistakes explanation in this midnight.

Okay,,I give one item only. I will explain you about BLOWDOWN.

Blowdown is differential pressure (can be in percentage) between set pressure and re-seat pressure. PSV start to open at set pressure and will 100% back closed at re-seat pressure. What do you think, why the re seat pressure lower than set pressure ? and What impact blowdown value to PSV's operation ?

See the picture below

And this picture below will show why the re seat pressure is lower than set pressure.

uhhh..sorry my friend,. This article is considered complete although there is still many question about blowdown which may be raised up. How blowdown can be adjusted to ovoid chattering. What the relation between blowdown and 3% pressure drop limitation at inlet pipe. How about blowdown for Pilot type PSV..etc and may be you have several other question also.

But Sorry my friend, I will sleep,,,let continue in other opportunity...

don't forget to pray each other my friend, pray before we sleep

Thank you -Domo arigatogozaimasu-