Recent content by Greg B

Hello, I find it interesting to see what kind of response I get. The thing is the pressure vessel has already been built and tested several months ago. The things I didn't bother to mention was we used hastelloy bolts. We used the ceramic gasket with a considerable amount of clamping...

Hello, The 20 ksi figure i quoted was the bottom number to have any safety factor for thermal variation/pressure variation/etc the number have would have to be higher. With 110ksi tensile strength bolts that shouldn't be a problem. I have worked with tubing in the 50-75ksi range and when...

Hello, So your advocating a surface to surface seal vs crushing the graphite seal? I went with ASTM A193 B5 bolts to give me a good clamping force and plenty of margin in yield strength of the bolts. I found a formula for face to face gaskets and it shows that the clamping force on the gasket...

Unfortunately your wrong at the fact, If you know the material yield point at room temperature then you can calculate what it will be at high temp. That how they test high temp pressure vessels for the chemical industry ,kinda hard to hydrotest above the boiling point of water. There is an...

Hello, The pressure vessel has a designed working presure of 7000psi and a burst of over 15ksi at 1600deg F and about half that at 1800def F The only real limitation has been the seal for the endplate because standard crush seals are near there melting points at this temperature. Probably...

Hello, I have talked to several companies that make high pressure vessel and heat exchangers and have essentially copied there design but i was looking for some more definitive calculations because of the temperatures . All the crush seal systems I have seen will not survive the temperature. O...

Hello, Having worked on the delta iv rocket structure. It is monolithic rings with which the sheeting is attached to. It was extremely strong and light and required a lot of machining. For the size of your rocket a 2024 tubular frame bolted together or a 6061 tubular frame welded...

Hello, This discussion has been held in many different forums and the answers are generally obvious because of the dictations of the physics involved. There was even an engineering study on the subject. Although there are gains do to reduction in drag ,The biggest predominant factor is...

Hello, I am looking for a seal design that would seal between the end plate and cylindrical section of a pressure vessel . The vessel is made of hastelloy X and has a working pressure of 4000 psi and a working temperature of 1600 deg F. ------------- ------ ...