Shahid,

• Measure the pipe (or approximate the dimensions) and model pipe in its thermally expanded state with its displacements that you see while operating, complete with shoe "limits."
• Under Environment>Special Execution Parameters set the ambient temperature to the operating temperature of the pipe.
• Set T1 to the actual ambient temperature you wish the system to cool down to, or other temperatures colder than operating (that the system is now using to approximate ambient conditions).