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Can anyone help me with a good source/link for Fishing and Milling technology ?

i would suggest, i) Use the ASME Section VIII Division 1 UG27 + Appendix 1 methods ii) Use ASME B16.34 - One of the appendices provides the method for wall thickness calculation. iii) Use Din 3840 i have been predominantly using ii) and supplemented with iii) and i). Hope this helps Bye

The parallel slide gate valve has a parallel disc sealing against seats by means of spring force, whereas a wedge gate valve has a wedge shaped disc which gets locked on to the seats by means of the mechanical seating load applied. Where a very tight shut off is required generally wedge gate...

You could also check with Novamag Italy - a cost effective source.

It is often a common practice to do Electroless Nickel Plating of Balls for superios performance.

In general a test bung with an 'O' Ring is used and the bungs on both ends of the valves are clamped together before applying pressure. This is very effective and proven methodology. Also, for buttweld end valve, since radiography is mandatory the standard allows you to offer them as special...

i understand LBS is an older terminology and the correct method to designate would be to use CLASS according to ASME B16.34 Regards Manian

The different flow conditions viz., liquid, gas, mixed are to be dealt with differently. While the liquid sizing is easier and straightforward, the gas sizing equations tend to get more complex due to the compressibility etc. The calculations are simpler as long as there is no choking. If a...

What are HEI standards and where are they available from? Regards

Shape being square might have a tendency for uneven distibution of residual stresses. May be you can try with a round bar?

i would suggest we make use of the Valve Engineering forum itself to discuss on Pressure Vessel issues also. i tend to raise issues related to pressure vessels there itself, since valves and pressure vessel issues are more closely related. i invite all those with similar interests to kindly...

Flange design approaches are available in ASME Section VIII Division 1 Appendix 2, DIN 2505 and DIN 3840. You can refer to any of these codes and design your own flange meeting your needs. Ofcourse these codes have their own limitations and one has to understand the code thoroughly before...

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...

With some experience in using both ASME and AD Merkblatter codes, i observed that for a dome type cover the shell thickness required in AD Merkblatter is considerably more than that as per ASME. One reason for this could be due to the difference in safety factors recommended in the two codes...

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...

The effect of the actual velocity being less than the minimum required velocity for full disc lift is 'chattering' i.e partial opening and closing of the disc continuously thereby leading to the wear and damage of sealing surfaces. Hence, it absolutely essential to size the check valve properly...

i have come across the book called Valve Handbook by Philip Skousen, which is worth the buy. it gives contemporary information on valves. you could check it out with a leading book seller.