Titanium gasket seating data

[OSIRIS7]

Hello,

For a customer I have to recalculate flanges for a heat exchanger. I need the minimum and maximum allowable gasket seating stresses of a Titanium Gr.1 (ASTM B265 Gr.1) Ø1199xØ1145x6 mm (47.2"x45"x0,25") solid flat gasket.

Is there any literature where I could possibly find these data, or is there anybody how knows this?

Kind regards,
Kelly

 

[gr2vessels]

Kelly, the manufacturer MUST have this data for the gasket he's selling with certification. Otherwise you don't buy!

 

[OSIRIS7]

The thing is that the design code of the vessel is ASME VIII. No problem here. It has been built in 2001. But the customer requested in 2004 a flange calculation according to the Dutch Rules for Pressure Vessels. People at my company received this calculation from the manufacturer and then added this to a flange bolt-up procedure in which we calculated the torque with the manufacturers results. However, it seems that the manufacturers calculation was not checked. The customer now found something that is not 100% correct and requested some clarification. All questions they have I can explain, except their question how the gasket seating stresses where established.

That is our problem right now. It is not a problem if we have to change the calculation, but we must clarify where gasket parameters come from.

Kind regards,
Kelly

 

[SnTMan]

Per gr2vessels, you should contact one of the bigger manufacturers applications engineers. I generally find them to be very helpful.

Now, are you talking about the "y" value used in Appendix 2 design, or are you talking about applied assembly stress?

Regards,

Mike

 

[OSIRIS7]

I have found out that the factor Y, the minimum allowable seating stress, one of the parameters is which I need. The Dutch Rules for Pressure Vessels require two more allowable stresses: maximum allowable seating stress at RT, and at design temperature (260 ºC). As far as I know, there is no other design code that works similar to our Rules.

I have had contact with a gasket manufacturer and a heat-exchanger manufacturer which uses solid titanium gaskets. I have not had the time to figure out wether the formula's they provided can be of use for me. I have yet to study them.


Kelly