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dayantony
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Join Date: Apr 2007
Posts: 17

Piping Standards and Fittings

06/30/2009 5:36 AM

Is there any relation to Pressure and temperture when we select socket welded and threaded fittings of 1500#,3000# & 6000#.I have never seen any pound rating of 150#,300# for this fittings.Please expalin

Also when we select the pipe how we can check the max allowable pressure and temperature for each standards like ASTM A53,ASTM A106,ASTM A182 etc.Please answer the questions
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sb
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#1

Re: Piping Engineering

06/30/2009 7:50 AM

The pressure and temperature together decide the class of the pips. ie class1500 does not mean it is for 1500 PSI pressure per se.

Check the ASME B31 they will answer your question in detail.

http://www.engineeringtoolbox.com/a106-carbon-steel-pipes-d_370.html

http://www.engineeringtoolbox.com/ansi-flanges-pressure-temperature-d_342.html

for sample.

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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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#2

Re: Piping Standards and Fittings

06/30/2009 11:16 PM

Threaded fittings are specified by class designation 2000, 3000 & 6000, where socket-welding fittings by 3000, 6000 & 9000 (no 1500).

And that class of designation is related to the pipe wall schedule number or wall designation as clear from Table 2 of ASME B16.11.

The pipe wall schedule No. or wall designation depends mainly on pressure, temp. and material, but the codes and standard have some limitations for using those fittings for higher design conditions and some critical type of loadings.

Table 2 Correlation of Fittings Class With Schedule Number or Wall Designation of Pipe for Calculation of Ratings

Class designation of fitting Type of fitting Pipe used for rating basis
Schedule No. Wall Designation
2000 Threaded 80 XS
3000 160 -
6000 - XXS
3000 Socket-welding 80 XS
6000 160 -
9000 - XXS
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Anonymous Poster
#3

Re: Piping Standards and Fittings

07/01/2009 2:42 AM

yes, there is a relation between pressure and temperature.

see book of thermodynamic and also material.

when you buy pipe, you will inform the spect of that pipe, type

this standards is depend on pressure and temperature.
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Anonymous Poster
#4

Re: Piping Standards and Fittings

08/21/2009 2:00 PM

Also in ASME 16.11 below the table we find this note as shown below .

"Pipe actually used may be thinner or thicker in nominal wall than that shown in Table 2. When thinner pipe is used, its strength may govern the rating. When thicker pipe is used (e.g., for mechanical strength), the strength of the fitting governs the rating."

Could ne one explain.

Thanks in Advance.

(experienced people please bare with me)
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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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Location: Cairo, Egypt
Posts: 1733
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#5
In reply to #4

Re: Piping Standards and Fittings

08/21/2009 3:45 PM

That is to say that when you connect two piping components together (such as pipe to a fitting) with different thicknesses, the component with thinner thickness shall govern our selection for the rating.

That is can be obvious when you connect two pipes with different thicknesses, the design calculations shall be based on the thinner pipe not on the thicker one.

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