Engineering Codes

Engineering in what sense?
Electronic, electrical, mechanical, civil engineering etc.
In what country? European standards differ from US standards. Local standards may differ widely in some engineering fields (civil engineering springs to mind, housing standards, domestic plumbing and electrics vary widely across the globe)
Del

To clarify, I was refering to the relationship between ASME, API, ANSI etc.....codes

Let's take a specific industry; Process Plant Piping (Refinery's and Chemical Plants, etc)

When you read them you will find that some of them are "Standards" and apply to one specific item only (eg: API 5 L = Pipe) and others are "Codes" and apply to how all the pieces and parts are assembled (ASME B31.3 = Process Plant Piping)

This is a very simplistic answer but I hope it gets the point across.

One of the ways the codes all tie up with each other is via the ISO series. Country standards such as DIN, BS, etc., have largely been absorbed into ISO standards, which are pan-European in application.

A standard is not mandatory, though deviations from a standard have been used successfully in civil law to apportion liability.

I think we are getting there on this...

For example, Asme section viii is a guide for boilers & pressure vessels and covers the use of SA106 gr B CS materials. Can we apply this code in determining the MDMT for A106 gr b CS which is a pipe material?

Although i know vessels are made out of CS sheets and we can assume the once conformed to pipe codes..is this a right assumption?

Make sure you read the first section of these codes. This is the section that tells you what they apply to.

Section VIII is for boilers and pressure vessels like you said. So it applies to that. ASME B31.3 has a section for determining MDMT for pipe so use that for pipe. B31.1 may have it also but I don't use the code much so I don't know.

Also, if you are rerating or altering existing pipe, make sure to use API 570 and the code that the pipe was built to.

yes,I agree with all those comments up there. from my previous experience, every codes and standards are specific and have no overlapping.pipe is for pipe, vessel is for vessel and what not. each and every country has got it's own codes and standards. it's true. even different companies in a country got different codes and standards either. but the thing is, when there's a contradiction between company's codes and ASME, API, GPSA, then, ASME, API & GPSA should be followed. it is how they complement and supplement each other. talking about vessel and piping, they are 2 different things and apply different standards. there are many reasons why they are not equal, to name but a few. for example, piping is located underwater, underground or on ground. next, piping transports service line while vessel isn't. it involves velocity, pressure drop, corrosion, erosion and what not. even though the raw material of them are of the same, you can never equalize them in designing step. line sizing and vessel design should be carried out to determine their requirements.

company's code for different companies for example: Petronas Technical Standard, Design Instruction Manual

1) Your customers tell you which codes your product must comply to. (the ones they want to purchase)

2) you purchase those codes and apply them to your product/facility

3) you acheive certification by being registered and audited with a governing body (ie API)