Recent content by TOVmania

It used to payoff from spin off projects beside Shell. Nowadays, everyone wants to have the glory badge so to speak in order to differentiate them from low cost competitors. This is not a simple process and it just has become more competitive. Unless your company is a multi billion dollar...

mmbguide, If you are working as a mechanical engineer for a valve company which does not have the engineering capabilities in terms of hardware, software and HR, you may need to take a different approach to this.

We received confirmation from the ASME Inspector that PTAW(or PTA) is determined HFO not HFSF.

Dear Pradip, Thank you for your clarification. Then how is the fusing temperature and cooling rate measured/determined? Is is based on the melting temperature of the substrate and the fusing material?

Dear All, I am quite confused with the category for PTAW in ASME Section IX QW-257.1. I submitted the question to ASME to get an answer. In the mean time, an ASME welding inspector insists that it is Spray Fuse because of Plasma Arc form as written in QW-216.3. Does anyone have an answer for...

I was going to leave this thread as is, but I changed my mind. ballvalveguy is asking how to test MAST and testing environment related to determining MAST value. I am not saying your initial statement is completely incorrect. What you explained is valve torque not MAST(Maximum Allowable Shaft...

This question should be addressed to the maker of Stellite materials. Not in this forum. Even then, the probability of getting and answer from the makers is very low. Just from my experience.

Yes, under one condition. 2(180 degree rotaion only) or 4(90 degree rotations) keyways in the gearbox drive bush that is in contact with shaft.

This is an open forum and, therefore, I understand that it can be seen as normal for someone who is not with an engineering degree to ask a question about a concept usually taught in ME 101 or 102. Just one question Valvit, what does pressure has to do with MAST? They are connected in a way but...

Visually? Hell yeah. If you have GAD, there is a cross sectional and it shows how that abnormal part should have been finished. So "TOBV manufacturer defend its due to the machining "abnormalities" for creating one side tapered and the opposite side relatively straight." is not true. With that...

I do not agree with any of above comments. Please do read commonly available NACE standards more thoroughly. There is an answer inside.

This is usually associated with the permanent deformation of sealing elements. Time to go back to calculation.

What BryceBunting commented make me wonder what kind of torque seating mechanism quad offset design utilizes.

For large sizes, you may want to perform Sub Zero Heat treament for dimensional stability under such environment. Only retained austenite changes to martensite, not all of them.

Watch out for filler metal chemical matching property with the base metal. You can never think one fits all within the same group.