Pressure Vessel Design & Fabrication
Our first case study was designed according to our customer requirements. That need, being an ASME Section VIII Division 1 Code pressure vessel operating at 225 psi and 250°F. As shown below, the pressure vessel is not routine ASME code. However, the vessel did follow the ASME Code as a rule. An FEA was included along with the ASME calculations to further insure code compliance.
For the next case study our customer required a pressure vessel that operated at 800psi and 1400ºF. The proposed ASME Code pressure vessel would serve as a test platform for advanced high-technology seals. The specifics are proprietary. Earlier in the year our customer required an ASME code pressure vessel rated for 800 psi at 1000°F. This vessel is currently in service and working to expectations. Customer pressure vessel requirements were intensified to 800 psi at 1400°F with similar dimensional constraints. The 1400°F unit would have to be designed to fit into the 1000°F test bed. The materials for a 1400°F design temperature are limited to expensive nickel alloys, but even with these very expensive alloys the mass of the unit would have to be increased by a factor of 3. The material cost and availability were not an issue, the size was.

TTD conceptualized and presented a viable solution to GE. The alternative would utilize heat transfer. The idea is allowing the inside to reach temperature, insulating an inner boundary layer, and cooling the pressure vessel from the outside so the temperature can be held below 1000ºF. TTD realized the thermal gradient conducted through the pressure vessel wall would have to be controlled to minimize any thermal stress. Calculations and subsequent Finite Element Analysis supported this approach. An FEA cross-section visualization of the temperature distribution and combined stress results are illustrated below.

Temperature Distribution

Combined Stress (Thermal & Pressure)