Shop Drawings 1

[Pmatherne]

Well have not posted in here for a while, but I have my FE and almost 2 years experience now
My job now is checking shop drawings and on thing that gets me stuck a lot are vavles.
Is there a good place I can look up some information like
Which metal is better ASTM B61 or B62 or B584 or B283 or A126
Also what each type of valve is good for and what each items mean

 

[MechEngNCPE]

Each metal, as you say, has its own appropriate applications, and can not be identified as "better." For instance, you would not need a 316L SS housing/gate/ball/seat/stem/actuator, etc.... for a system where you have victaulic piping, haha, I would tell you to take a look at the systems' requirements and approach accordingly. Look at pressures, temps, fluid medium, corrosion resistance, etc.

 

[gerhardl]

Engineering: The art of knowing when you lack knowledge, how to formulate questions, and where to ask...


...There is a reason that there is such a thing as a 'valve engineering forum'. In general there is a lot of 'unwritten rules' that are difficult to handle as 'best practice' for a certain application will vary with local rules, conditions, practise and commercial availabillity.

The best advice I can give you is the same I give to all young engineers: (And this is not meant to be anything but a resume of my own hard earned experience)

Gather all relevant data for valve and application (yes, it is necessary to have all details, even if you have to take an extra phone or send a mail)

Try to form (in writing) a 'high specified question': (Eg. for application so and so (all process and operating engineering data), requirement is for a valve of (all valve data, including diameter, pressure class, all relevant test and working pressures, flow details etc) body material is required to be xxxx, trim material yyyy. A bidder is giving a deviating quote with xxx1 material and trim zzzz with sealings vvvv. Test and inspection requirements are

http://wwww.

Is this (deviation etc) suitable/allowed/normal etc?

Try to search net for information, or ask more experienced collegues, or try find solution yourself otherwise.

Please also remember that engineering is very much communication and information exchange of engineering details between different specialists: very often a dirct question back to the party presenting information that make you wonder, will help.

A formulated 'sharpened' question as above, with the comment please explain or give your technical arguments (for the proposed deviation, material use etc.) is the best way to highlight your question.

Another trick is to search the valve forum for keywords....

 

[vpl]

In regard to your question about "which type of valve is better" -- if you have some time, read through some of the posts on this forum. The question "which type of valve is better for this application" gets asked quite frequently. Reading the various questions and replies, you'll soon pick up a general understanding of which type valve suits which type application. Then, when you have a specific question, do as gerhardl suggests and gather as much information as possible and then pose the question.

Patricia Lougheed

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