Material Selection Diagram(MSD) 2

[106coral]

Hello,

I was asked to prepare material selection diagram for slurry piping system from owner.

Before doing this job I would like to know what information are required from our process engineer.

I wonder if a PFD is enough to prepare MSD.

As well, is there any particular format to prepared this?

I would really appreciate it if some one would help me.

Regards,

 

[metengr]

106coral;
Is the MSD for in-service inspection monitoring and future repairs or replacement of pipe spools related to an existing slurry piping system for the owner?

If so, this is something you can do yourself with minimal effort. All you would need to do is to start with a blank Excel spreadsheet and list the existing piping system by OD, wall thickness, elevation/hanger and material. You could add operating information as you see fit.

 

[106coral]

Metengr,

This is a new slurry piping system not related to existing piping system.

I wonder if all piping materials, such as pipe and valve are included in MSD.

Thank you.

 

[metengr]

Yes, for a new piping system, I would include this information. I would include all pertinent information on the type of valve, valve material and location in the line. You want the MSD to be able to be a handy reference guide for future inspection and/or repair activities.

 

[SJones]

In oil & gas, it is usual to simply "colour in" the PFD as an overview to guide the piping engineers in the selection of the correct piping classes. It is the latter, when expressed with a line list, that can give the specifics of actual specifications and grades of materials for the pipe, valves, etc if so desired. In summary, the MSD will always need to be supported by text.

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/

 

[NickelMet]

We have asked our piping design companies (contractors) to provide MSD's on recent projects. I would think companies like Fluor-Daniel or Jacobs may be able to provide some insight to what is laid out in a table - as long as you're not a competitor.

What you are trying to do with the development of an MSD is make sure you are addressing the potential damage mechanisms by providing the proper materials. This means you will need to know stream content, temperatures, pressures, etc. The MSD should also address valve type, including trim and such. A PFD is a decent starting point, your process engineer will be invaluable, and a knowledge of damage mechanisms is mandatory.

Also, NACE is developing a recommended practice called "Basic Guidelines for Developing a Materials Selection Diagram". It is not available yet, but should be sometime this year. If you contact the committee chair, and if you're a NACE member or have one available at your company, you may be able to get the draft version of the document for use as an aid only.

~NiM

 

[TomEun]

NACE TG-302 committee has been developing “Basic Guidelines for Developing Materials Selection Diagrams” for the first edition (probably 2006).
MSD is normally developing from a simplified PFD to show material selection information and some material requirements as below (General Guideline);

1. Specified facilities in MSD
Equipment, Piping, some specific Valves, etc.

2. Described design data
(1) Pressure (Design & Operating)
(2) Temperature (Design & Operating)
(3) Materials (CS, 1 1/4Cr, 12Cr, 304L SS, etc. for new construction)
Materials (SA-516-70, SA-335-P5, SA-240-304L, etc. for as-built or operating/maintenance)
(4) Thickness (Only for as-built or maintenance)

3. Specified Components of Equipment
(1) Columns : shell (per different materials), internals (i.e. different materials of trays), etc.
(2) H/EX : shell, channel, tubes, tubesheet, etc.
(3) Air Cooled H/EX : headers, tubes, plugs, etc.
(4) Tanks : shell, roof, bottom (per different materials), Internals, etc.
(5) Piping : pipe, valves & their trims, etc.
(6) Heaters (furnaces) : heater tubes (radiant-all or each bundle and convection), refractory, etc.
(7) Pumps : Casing, Impeller, shaft, etc.

4. Specified material/fabrication requirements
(1) Corrosion allowance (and specific schedule for piping)
(2) PWHT or Stress Relieving
(2) Wet sour service requirements (SSC or HIS resistance by company standard levels)
(3) Hardness limitation
(4) Specific impact test requirements (i.e. MDMT, etc.)

5. Corrosion Control and Monitoring Information(Option)
(1) Corrosion Monitoring Probes/Methods - location & type
(2) Chemical Injection - location & type
(3) Sampling Points
(4) Cathodic Protection - location & type

6. Marking Type of Piping (* recommended)
(1) Different Color per materials (*for as-built or operating/maintenance)
(2) Different line types per materials (*for new construction)

7. Process Data (Option)
(1) Materials Balances
(2) % or ppm of Severe Corrosive Components (i.e. H2, S, H2S, CO2, HF, CN, chloride, TAN No., etc.)
(3) Partial Pressure of Severe Corrosive Components (i.e. H2, H2S, NH3, HCl, CO2, etc.)

8. Others (Attention)
(1) Detail information for spec break in piping (i.e. at valves, tee, cross, dead leg, etc.)
(2) Specific Notes (i.e. Upset condition, short notes for corrosion control, etc.)
(3) References
(4) Any other requirements


Hope this helps.

Thomas Eun
Corrosion and Materials Selection/Design Specialist

 

[macmet]

This has been an informative thread. How common are these MSD diagrams? What is a PFD diagram? Does anyone know a few good online examples of good MSD diagrams? I had never heard or used one of these, unless they were given a different title.

I think something like this might be helpful where I work and wouldn't mind looking up how to make some effective ones.

TomEun's response was already very helpful.

 

[NickelMet]

Tom could probably answer a bit better on the commonality across industry, but I'll give my 2-cents.

I work in the Petroleum Refining industry and my comapny has been using MSD (Material Selection Diagrams) on newer projects for about 4-5 years now. Rudimentary material review processes and such existed before then but the MSD process gives us a clean and standardized way for review AND documentation. And, it gives you a document trail to see WHY the decision for a certain material was made. (Something that did not exist in the past for us.)

PFD stands for Process Flow Diagram. It is an overview of a process which includes all pertinent equipment (such as heaters, pressure vessels, heat exchangers, pumps, etc.) and connects them together using the flow of the process streams. It can address process operating and design conditions (such as temperature and pressure) as well as some level of automated control overview. Additionally, some PFD's will contain process stream composition and identification. The key is to keep the diagram simple enough to understand the process.

Lately, some companies have undertaken projects to combine the two data sets into one large set that identifies not only the process flow, but the materials selected to be used in the process, from a high overview level. In addition, identification of corrosion (damage) mechanisms and levels of corrosives/toxics can be placed on the diagram for easy analysis.

Also, if you think of the base document being a PFD, you can use layers (from AutoCAD or any other CAD program) to describe items in the process. Think about adding a layer for corrosion mechanisms...a layer for control points...a layer for design/operating information...etc. The ideas are only limited to the amount of information you need.

IMHO, by using technology and these tools, one could develop a very powerful information engine that would benefit a plant-site or company...especially the engineers and operators. At my company, I'm currently working to develop the next level of the engine which will link even more information sources together using a web-based point-n-click approach.

Just my 2-cents...

~NiM