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Pipe

Varun Patel, B.E- Mechanical, PMP®

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Pipe• A straight pressure tight cylindrical hallow,

used in piping system• Different types of pipes used in different

design conditions, considering technical and commercial parameters

• Pipes are mainly classified as follow ;

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Pipe• Pipes are mainly classified as below;

PipeSeamlessWelded

SAWStraight SAWSingle SeamDouble Seam

Helical/Spiral SAWERW/EFW

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Pipe Size• Pipe size are mentioned as nominal pipe

size (NPS),also mentioned as Diameter nominal (DN)

• It is in-between of outer and inner diameter of pipe

• For NPS 14” and above NPS is same as outer diameter

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ID will changed with changed in Pipe Schedule number

Pipe Size

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Pipe length• Pipe are available in following lengths−Single random

•4.8 m to 6.7 m with 5% of lengths 3.7 to 4.8 m

−Double random•minimum average of 10.7 m and a minimum length of 4.8 m with 5 % 4.8 m to 10.7 m

−Fixed length as per purchase order

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Pipe Thickness• Thickness are expressed in Schedule

number (5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160)

• Also in STD, extra strong-XS, double extra strong-XXS

• Higher the schedule higher the thickness

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Pipe Thickness• What is Schedule No?• A schedule number is the approximate

value of the equation = 1000 P/S−P is the service pressure in (psi) −S is the allowable stress in (psi)

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Pipe Thickness• The outside diameter of each pipe size is

standardized. Therefore, inside diameter depends upon the schedule number of pipe

• ASME B36.10 provides standard dimension requirements for Welded & Seamless wrought iron pipes.

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Pipe Thickness for Stainless Steel• Thickness are expressed in Schedule

number (5S, 10S, 40S, 80S)• Schedule no with S suffix are per ASME

B36.19M, and it is use with stainless steel pipe only.

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Pipe ends• Pipe can be

−Plain end−Beveled end−Threaded end−Special end such as socket & spigot with o-ring type gaskets

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What you have learned?• Basic of Pipe• NPS & Schedule No.• Types of Pipe End

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