Line Pipe Diameter And Wall Thickness

Your question (What is the difference between permissible outside diameter and wall thickness) makes no sense at all.

I will simplify the question after considering your difficulty to understand my layman level english. The simplified version (below layman level) as follows,

1.I would like to know, when we refer or review table-9 values of API 5L and ASME B36.10M (which is provided in the same Table-9 as Note)?

2.Both API 5L(44 edition) table-9 and ASME B36.10 are applicable for line pipe or not?

3.What is the logic behind table-9 values of API-5L?

4.What is the logic behind ASME B36.10M in the Note of table-9 of API 5L?

Hope now my query is bit more clear...I am looking for the answer from your experience.

Cheers!

You may be able to find many, many answers in this book:

I gather that you have not read it. Amazon.com, $11.47

Hey my friend,yes you are right.i reread the sentence and found the problematic area.i forgot to give you thanks for point out my grammatical mistake in the above sentence. sorry for the belated thanks.

SPECIFICATIONS FOR STEEL PIPE

Might give you some insight.

Thanks a lot lyn for the spec.I had downloaded it well before,unfortunately it doesnot answer my above mentioned questions.Some easily answerable question to you,

1.Have you ever worked in pipelines(oil,gas,water,slurry etc)?

2.Have you heard about onshore and offshore terrain in pipeline industry?

3.What is the full form of API?

4.When API 45 edition will come into effect?

5.What is PSL-1 and PSL-2?

6.What is TMCP steel and why heating above 580 Degree Celcius will affect it's mechanical property?

Cheers!

Is that all questions you can answer or are those questions you have?

Question 3 seems a bit odd. API is the American Pertroleum Institute, what form are you refering to?

A6) because the mechanical properties of the steel change at that temperature, making it weaker.

some interesting discussion here

cheers!

The wall thickness is something that first of all is defined by your process needs. Once you refer to API or ASME it just becomes a standardised item. Your customer might have a word on this what standard he wants his pipe to follow. Also the authorities might have a word on that.

In my layman's English the answer to the last question is:

If you specify the outside diameter the pipe will have to follow OD and the ID is depended on the WT. If you specify Wall Thickness the OD is secondary and can vary.

Its just the way these two different table look at things. You have to make sure you understand what pressure, temperature and other process parameters apply to you pipe and that it will be fit for purpose while maintaining the standard its being asked for.

Hope that is not to layman for you but I dont understand more of this as I do not have the table to look at like you do.

You are beating around the bush.Why are you wasting your precious energy and your highly precious time in CR4 for answering questions which you have no idea??
The following is the table-9 of API 5L. Could you explain bit more in plain english on my following query?
1.What is the logic behind the rows of table-9 values of API-5L? ie, in API 5L Table-9, each row consists DIFFERENT range of diameter and different range of wall thickness for regular sizes(regular plain end terminology has been superseded by addendum-3 issued July,2011 and effective from January1,2012).
Let us take first row values of table-9 of API 5L,
Is it mean that,
1.I can use 10.3 mm to 13.7 mm outside diameter pipes with a wall thickness ranging from 1.7 mm to 2.4 mm.
2.I cannot use 10.3 mm to 13.7 mm outside diameter pipes with a wall thickness less than 1.7 mm and above 2.4 mm?

Cheers!

They would apprear to be guidelines on tolerances to which the pipe manufacturer can work. Pipe to these tolerances will fit into fittings that are intended for these tolerances.

Seems you try to be funny there!

But by looking at the table and at what you say (but dont hold me for it as I did not waste much time on it really) I would say:

Do not look for logic where there maybe is none!

q1 - yes

q 2 - yes

A standard tends to define things whether you like them or not. In order to make them work for you you would have to change it.

Good luck!

Line sizes are a function of maximum flowrate.

Wall thicknesses are a function of line size, minimum and maximum pressure, and minimum and maximum temperature.

All these things come from the Process Description document or the Process Flow Diagram.

If in doubt, consult a qualified Piping Designer.

Thanks PWSlack for the guidance.I was in a mood to know for what purpose table-9 values are used.From your earlier reply in #14,I understood that,table-9 values are used for general manufacturing tolerance for line pipe diameter and thickness.However, customer specification and purchase order may overrule this general tolerance in table-9. In that case,For Pipe diameter and schedule(thickness) we have to refer ASME B36.10 (if it is mentioned in customer purchase order). Is it correct?

Cheers!

Do whatever the Client's specification calls for. To do otherwise is commercially hazardous.

This thread is another fine example of why ALL ANONYMOUS POSTERS SHOULD BE BANNED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!