A jacketed vessel is to be used as a reactor. The vessel has an internal diameter of 2 m and is fitted with a jacket over a straight section 1.5 m long. Both the vessel and jacket walls are 25 mm thick. The spacing between the vessel and jacket is 75 mm. 

The vessel and jacket are made of carbon steel. The vessel will operate at atmospheric pressure, and the jacket will be supplied with steam at 20 bar. Check if the thickness of the vessel and jacket is adequate for this duty. Take the allowable design stress as 100 N/mm² and the value of Young’s modulus at the operating temperature as 180,000 N/mm² .