Selection of ear seat loads for titanium equipment and ear seat moments at the cylinder

Thread Content

I have a few questions: 1. Appendix B of the ear mount standards provides the bearing moments corresponding to the allowable stresses for four different materials. Is this allowable stress based on the design temperature or room temperature? For example, for a device made of TA2 material, the allowable stress at a design temperature of 120° is 117 MPa, while it is 147 MPa at room temperature. When checking the bending moment at the flange area of the device’s cylinder, should the value of 120 MPa from the appendix be used, or should 147 MPa be used? 2. Are the moment values given in Appendix B for the lug with a shimming plate or without one? 3. Appendix B only provides the bending moment values for four calculation pressures of 0/0.6/1.0/1.6. If the calculation pressure corresponds to a negative-pressure device, which condition should be used for lookup? 4. For devices made of TA2 material, the ear mounts are generally connected using titanium and carbon steel bolts; in such cases, can the load on these ear mounts still be calculated according to the standards applicable to standard ear mounts? For example, the load capacity for a B6 standard earthing lug is 186 KN; so what value should be used for the load capacity of B6 earthing lugs on titanium equipment in such cases? Should there be a discount?