No replies to this topic

[Zauberberg]

Dear All,
My question is regarding depressurizing in HYSYS.

I want to depressurize 24” (ID 547.72 mm, thk 30.94 mm) 52 m length pipe. Pipe volume is 12.3 m3.

Geometry:
2” line present on 24” line. On 2” line there is one RO (Restriction Orifice), upstream of RO there is globe valve and after 600 mm (minimum) there is ball valve after ball valve a spool piece and 24” line. Downstream of RO is routed to vent line open to atmosphere, having approximately 0.2 bar drop in line.

From ball valve to vent line material is LTCS having design temperature -50°C.
After running this model in HYSYS, I am getting final vapour temp as 0.18°C and minimum temp as -2.8°C. Upstream of ball valve line design temperature is 5°C. I want to restrict vapour minimum temp to 5.5°C

Input:
Operating Condition: 86 bara & 22°C.
Ambient Temp = 5°C
Natural Gas: 84.46mol % Methane.