Cryogenic Cold box vs. Non-Coldbox Question
Cryogenic Cold box vs. Non-Coldbox Question
(OP)
Guys,
I am new to this cryogenic. I was reading the standard MSS SP-134-2006a "Valves for Cryogenic Service Including Requirements for Body/Bonnet Extensions" and i came across two terms
1) "Cold Box" Extension
2) "Non-Cold Box Extension"
According to the standard :
Cold Box Extension defines that the operating mechanism of the valve is outside the cold box which makes sense
but what do you mean by non-cold box ?
In standard non-coldbox is defined as "A body/bonnet extension that is used for valves that are normally individually insulated "
What does this mean ? When you do the cryo test according to BS 6364:1984 , the valve is placed inside an insulated box and the operating handwheel or gear is outside the box. Evrything inside the box is insulated but how can you have a cryogenic valve that is individually isolated? I am just getting confused in the difference.
Also in the standard Table 1A , lengths for non-cold box stem/bonnets is shorter than the cold box.
Please help..
I am new to this cryogenic. I was reading the standard MSS SP-134-2006a "Valves for Cryogenic Service Including Requirements for Body/Bonnet Extensions" and i came across two terms
1) "Cold Box" Extension
2) "Non-Cold Box Extension"
According to the standard :
Cold Box Extension defines that the operating mechanism of the valve is outside the cold box which makes sense
but what do you mean by non-cold box ?
In standard non-coldbox is defined as "A body/bonnet extension that is used for valves that are normally individually insulated "
What does this mean ? When you do the cryo test according to BS 6364:1984 , the valve is placed inside an insulated box and the operating handwheel or gear is outside the box. Evrything inside the box is insulated but how can you have a cryogenic valve that is individually isolated? I am just getting confused in the difference.
Also in the standard Table 1A , lengths for non-cold box stem/bonnets is shorter than the cold box.
Please help..





RE: Cryogenic Cold box vs. Non-Coldbox Question
In comparison, individually insulated simply means that the valves and pipe have insulation around them but they are not inside a box. Imagine a long length of pipe extending 100 feet in a straight line with a couple of valves on it. You wouldn't want to put a box around this. Instead, you put cylindrical insulation around the pipe and similar insulation around the valves.