How to make Material selection of pipe

Material compatibility, pumping pressure, temperature resistivity, fluid properties (e.g. viscosity etc)

.............organisation Piping Standards..............

you can look for piping hand books number of publications are avilable in the market

crm

Agree on 1# also consider causticity and toxicity.

chin,

There are three basic parameters to consider.

Chemical properties of the material, the mechanical properties of the material and the fluid to be transported.

The chemical and mechanical properties of the pipe material must accomodate the fluid to be transported.

This is the simple answer. If you want more details let me know.

chama2633

yes i want more details regarding this. please specify me.

Yes i want more details.

Hi, Abdel Halim Galala!

There is also the proclivity of various piping materials to chemically combine with the gases/fluids that should therefor be avoided from being introduced through the piping to prolong the life of the pipe. Does the ASTM standard or any other reference text cover this anywhere that chintunimmagadda can look up? GA for the answer you have provided thus far. I believe it's exactly what was requested.

Mark

Hi MarkTheHandyman

Yes, the proclivity of various piping materials to chemically combine with the fluids inside piping system is considered within the corrosivity of the fluid itself with the piping material. And the rate of corrosion depends on both concentration and temperature. Corrosion means that there is a chemical reaction between the fluid and pipe material. And this corrosion rate, as derived at item C of my post #7, can be found from NACE code, Corrosion Data Survey-Metal Section.

Hi, Abdel Halim Glalala!

Would this reference include, for example, the proclivity of stainless steel at most content mixes to combine with sulfur in gases running through it? The sulfur in this instance is not corrosive to the stainless. Just the chemical bonds are friendly to each other.

The same result occurs with catalytic responses of some metals that adsorb other elements or chemicals to their surfaces without corroding, but where the adsorption can hinder the responsiveness and usefulness of the catalysts. In the case of piping, the result might be narrowing of the inside diameter resulting in important pressure/velocity and flow differences.

Even some long chain molecules such as plastics are subject to unwanted chemical combination without becoming galvanically involved.

I know I should be looking up your reference to check for myself whether these issues are addressed in there; but I figured I'd ask you anway, because if they aren't, you're the go-to guy to find out where they are.

Mark

Hi, MarkTheHandyman

The NACE code deals with corrosion rates of different metals due to chemical reactions of conveyed fluids, and I think that the NACE code haven't any relation with the catalytic response which have no corrosion.

Sir,

i want to know ASME BPVC Section II

ASME Pressure Piping Code

• ASME B31.1 Power Piping.

• ASME B31.2 Fuel Gas Piping (superseded since 1968 and now included into B31.3).

•ASME B31.3 Chemical Plant and Petroleum Refinery Piping (Process Piping).

•ASME B31.4 Liquid Transportation Systems for Hydrocarbons, Liquid Petroleum Gas, Anhydrous Ammonia, and Alcohols.

•ASME B31.5 Refrigeration Piping.

•ASME B31.8 Gas Transmission and Distribution Piping Systems.

•ASME B31.11 Slurry Transportation Piping Systems.

•ASME A13.1 Scheme for the Identification of Piping Systems.

•ASME B31G Manual for Determining the Remaining Strength of Corroded Pipelines, (A Supplement to B31, Code for Pressure Piping).

you can go to www.standardshop.org
there sale a lot of asme aws api standard and so one .can immediately download,and very cheap low price!

Hi all,

Dear chintunimmagadda, the problem addressed is a bit general and therefore difficult to answer completely, but response given by Abdel Halim Galala is a very good approach and I give here my vote to him.

Regarding ASME Section II, is a very thick document, distributed in various volumes as Abdel pointed very well. I don't think you can get that documentation in a free way, surely you have to pay for it. Anyway, the material specifications included in Parts A and B of ASME Section II, are derived from ASTM standards (many times are exactly the same text or with minor typographic corrections) The differences are that ASTM standards have an identification type like "A 182" and the ASME corresponding one is identified as "SA 182" (ferrous metals specifications begin with "A" and "SA" but non ferrous materials begin with "B" or "SB")

Part C of ASME Section II deals just with weld filler materials and in this case, the different specifications are derived from AWS ones instead of ASTM, and ASME designations add an "SF" to the AWS designation.

There are no ASME II own specific materials, all you can find are those ASTM or AWS materials adopted as allowable by ASME Boiler and Pressure Vessel Code Committee for use within the scope of the different Code Sections.

Regarding to the post about sulphur-SS behaviour, Ther is a NACE standard, MR0175 which deals with sulfide attack on different materials in the oil industry. We have to comply with it as a design requirement for a desulfuration unit.

Cheers

Dear Kwetz,

That is right, thank you.

Dear Galala,

i can get related documents material selection

As Kwetz said in post #18: "I don't think you can get that documentation in a free way".

Please call ASME.

As someone else explained before is not an easy task to select the correct materials.

First you've to find all the necessary informations on the service and operating conditions.

• Fluid Type and Compositions
• Operating Conditions
• Temperature (Min / Max)
• Pressure
• Desing Life
• Location
• Internal / Eternal
• Marine/Industrial Atmosphere
• …..

The selection of the materials is based on corrosion resistance, mechanical properties and most important cost/risk analysis. The selected materials can have the corrosion resistance for the service but maybe the lower temperature doesn't allow you to use that particular material.

One thing that is always useful is to search for other service like your and see what kind of materials has been selected. If it's not a very unusual service you'll find a lot of information and suggestion.

This is just to begin..maybe if u tell us more about your service we can give u more detailed informations.

Regards

S.

Corrosion Control & Corrosion Prevention

Hello,

In my work experience, if you are planning to transport drinking water through pipe, then you can simply go for GI Pipe. for other fluid, you can see Preesure piping B31.

Piping Material Selection Criteria

Everything I will say here no doubt has already been said. This version is just a different way of saying the same thing.

What are the important elements and their properties to be considered while selecting a material in oil and gas industry practices keeping in view each selection criteria for materials?

The selection criteria for materials:

· Pressure - Pressure is low, neutral (atmospheric) or high. On the low end of the pressure scale you could have from just slightly below atmospheric all the way down to full vacuum. Full Vacuum or even just a moderately low pressure can collapse pipe and other piping components. You must select a wall thickness (or reinforcement Rings) to prevent the negative force of the low pressure. On the high end of the pressure scale you must prevent the pipe and other components from failing and the system turns into a bomb. Fracture failures do to high pressure can and does kill people in process plants.

· Temperature - Above we discussed Pressure, now if you add Temperature to the mix you compound the risk. A very low temperature even just -50 F (-45 C) and either a very low pressure or very high pressure you have an even higher risk of component failure. On the other hand High to very high Temperature can degrade the structural capabilities of the various piping components. Look at the Flange Rating Chart. As the Temperature goes up the Pressure (Containment) rating goes down.

· Commodity - What is it? A Gas (Vapor), a Liquid or a Slurry? The State of the commodity can have an impact on the selection of Valve types, packing or Gasket materials.

· Corrosion - Is the commodity a highly corrosive fluid or gas? If so, How corrosive? What is the rate of corrosion you must use in the calculation for "Plant Life"

· Erosion - Erosion can be caused at elbows by things like sand in a Concrete Slurry mix or by Air or Gas bubbles in mixed (cavitation) flow. You would need to select an erosion resistant material or a manner/method (Flanged Crosses with built-in wear plates) for changing directions that minimize excessive erosion.

· Piping Code - ASME B31.1, B31.3, B31.8, etc all have different applications and have slightly different criteria for certain things. So the applicable Code for the Project needs to be consulted.

· Toxic Risk - There are some commodities that are so toxic that you would not do the standard, common everyday things. You would select all butt-welded construction where ever possible (Vessel nozzle to pipe, pipe to valve, etc) to eliminate the possibility of leaks. You would also select welded bonnet valves with "Bellow Seal" so you do not run the risk of Stem leaks from packing failure.

· Purpose - The purpose of the line is important to the selection of material. The commodity in the line may be a combination of Oil and Water but the line is an Underground Oily Water Sewer. That "Purpose (or Function) makes a difference in the selection of material.