ASME B31.3 Process Piping - PSIG Home Page

ASME B31.3 Process Piping Course

2. Metallic Pipe & Fitting Selection

ASME B31.3 Process Piping

Charles Becht IV, PhD, PE

Don Frikken, PE

Instructors

BECHT ENGINEERING COMPANY, INC.

Metallic Pipe & Fitting Selection -

1

Piping Development Process

1. Establish applicable system standard(s)

2. Establish design conditions

3. Make overall piping material decisions

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?

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Pressure Class

Reliability

Materials of construction

4. Fine tune piping material decisions

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Materials

Determine wall thicknesses

Valves

5. Establish preliminary piping system layout & support

configuration

6. Perform flexibility analysis

7. Finalize layout and bill of materials

8. Fabricate and install

9. Examine and test

BECHT ENGINEERING COMPANY, INC.

Metallic Pipe & Fitting Selection -

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ASME B31.3 Process Piping Course

2. Metallic Pipe & Fitting Selection

2. Metallic Pipe & Fitting Selection

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Piping System Failure

Bases for Selection

Listed versus Unlisted Piping Components

Fluid Service Requirements

Pipe

Fittings

Branch Connections

Flanges

Gaskets

Bolting

Flanged Joints

BECHT ENGINEERING COMPANY, INC.

Metallic Pipe & Fitting Selection -

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The Material in This Section is

Addressed by B31.3 in:

Chapter II - Design

Chapter IV - Standards for Piping

Components

Appendix G - Safeguarding

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Metallic Pipe & Fitting Selection -

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ASME B31.3 Process Piping Course

2. Metallic Pipe & Fitting Selection

Piping System Failure

How can you recognize a failure in a

piping system?

BECHT ENGINEERING COMPANY, INC.

Metallic Pipe & Fitting Selection -

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Bases for Selection

? Pressure Class

? Reliability

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?

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Robustness

Fire Resistance

Blow-out Resistance

Tendencies to leak

? Material of Construction

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Corrosion Resistance

Material Toughness

? Cost

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Metallic Pipe & Fitting Selection -

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ASME B31.3 Process Piping Course

2. Metallic Pipe & Fitting Selection

Pressure Class

Ratings for above ground metallic systems

are generally governed by their joints.

Frequently these are flanged joints

manufactured in accordance with ASME

B16.1 (iron flanges) and ASME B16.5 (other

metallic flanges).

Ratings for flanges (and some other piping

components) are designated by pressure

class.

BECHT ENGINEERING COMPANY, INC.

Metallic Pipe & Fitting Selection -

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Flange P-T Ratings¨C Gray Iron (psi)

(Class Rated in accordance with ASME B16.1)

BECHT ENGINEERING COMPANY, INC.

Metallic Pipe & Fitting Selection -

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ASME B31.3 Process Piping Course

2. Metallic Pipe & Fitting Selection

Flange P-T Ratings¨C Gray Iron (bar)

(Class Rated in accordance with ASME B16.1)

40

Pressure (barg)

Class 125,

NPS 1-12

30

Class 125,

NPS 14-24

Class 125,

NPS 30-48

20

Class 250,

NPS 1-12

10

Class 250,

NPS 14-24

Class 250,

NPS 30-48

0

0

50

100

150

200

Temperature (C)

BECHT ENGINEERING COMPANY, INC.

Metallic Pipe & Fitting Selection -

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Flange P-T Ratings ¨C Carbon Steel (psi)

(Class Rated in accordance with ASME B16.5)

7000

Pressure (psig)

6000

5000

Class 150

Class 300

4000

Class 600

Class 900

3000

Class 1500

Class 2500

2000

1000

0

0

100

200

300

400

500

600

700

800

900

1000

Temperature (F)

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Metallic Pipe & Fitting Selection -

10

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