Valve Stems are often made out of ASTM A182 Gr F6a Cl 3
materials. When these stems are required for NACE MR0175 service, these have to be double tempered. However, the ASTM standard A182 does not list the properties after double tempering. Can any body help me with an authentic source for the...
Valve Stems, Gland Eye Bolts and Pins are often required
in SS316 and SS316L meeting NACE MR0175 requirements. Due to solution annealing the mechanical properties drop down to very low limits. Can some one suggest suitable alternate materials for these applications. Minimum yield strength...
ASME Section II Part D deals with allowable stresses
for various materials. While ASTM A487 Gr 4 Cl A material is covered, some of the other classes of this material
like Cl D are not covered. Could any one throw some light on this and the reason behind it ?
ASME B16.20 covers SS Type 316 Ring Gaskets and indicates the hardness requirement as 160 HB max. Could the same requirement be specified for SS Type 316L Ring Gaskets
also ?
ASME Section VIII Division 1 Appendix 2 gives the design
procedure for flanges using allowable stresses as per
Table 3 for bolting materials in Section II part D. Similarly Section VIII Division 2 Appendix 4 cross refers
to Appendix 3 for Flange Design but with design stress
intensity for...
ASME Section VIII Division 1 Appendix 2 deals with the circular type flange design. but often there is a requirement for designing non-circular flanges particularly oval/elliptical type flanges which are integral part of valves.though the above appendix deals with non-circular flanges, its...
in ASME Section VIII Division 1 Appendix 2 - Design of bolted joints, ASME stipulates that minimum diameter of the threads shall be taken into consideration for deciding the required bolt area. do we have to take the minor diameter of the thread or the tensile area ? generally the tensile area...
in the design of pressure vessels, ASME Section VIII indicates that casting quality factors are to be taken into consideration. can somebody explain what these factors are and in what instances these factors are to be used.should these be considered in designing bolted joints particularly on...
there is a requirement for a range of swing check valves of different sizes with working pressure of approximately 8 kg/sq.cm for sea water application. body and internal materials are of 18-8 SMO stainless steel. is it acceptable to use this material for sea water service ? if not, any other...
How to fix the allowable stresse for the following stress conditions, for mechanical equipment and pressure vessel ? The basis has to be realistic based on research findings since we cannot assume high factors of safety.<br>
<br>
Tensile Loading<br>
Compressiver Loading<br>
Shear Loading -...
Can any body provide the correct procedure for selecting Thrust Ball Bearing for Industrial Valve applications ? The information provided by Bearing Manufacturers does not cover this end use. The valve is only manually operated where the speed is low. If we select a bearing as recommended in...
Are Line Pipe Threads and NPT Threads interchangeable? If not, please explain what are the differences between these threads. If NPT threads would suffice the need, why Line Pipe Threads are required ? What are the torque requirements for Line Pipe Threads and NPT Threads ? How to calculate the...
Is there a free flange design software/spreadsheet/program available ?<br>
Can we use a Ring Gasket of Class 150 Flange for Class 900 Valve Cover flange provided the flange design requirements as per ASME Sec VIII are met with ?
