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FLUID SEALING SOLUTIONS

SEALING FOR A GREENER AND SAFER TOMORROW

Presented by: Joel Baulch

LE SPIRAL WOUNDS

Question:What sealability do you get with a standard ASME B16.20 SWG?

Answer:There’s no way to know?

ASME B16.20- Appendix B• Testing has shown that not all gaskets are able to

achieve the desired level of sealability• Several gasket variables impact gasket sealability• ASME PVP Paper was written about this topic

ASME B16.20- Appendix BWhen SW’s are removed, you can see where the RF flanges have rolled and left an imprint on the guide ring.

A groove was put in the centering ring to determine if SW’s are sealing on the windings or centering ring.

ASME B16.20- Appendix B

Install

20004000

5877

11694

16416

20464

31453

39774

60175

Recove

ry0.00

1.00

2.00

3.00

4.00

5.00

6.00

0102030405060708090100

LOW DENSITY - NORMAL GUIDE RING

Travel Leakage (ppm)

Gasket Seating Stress (psi)

Thick

ness

(mm

)

Leak

age

(ppm

)

Install

20004000

53119190

13498

17879

26592

35395

53204

Recove

ry0.00

1.00

2.00

3.00

4.00

5.00

6.00

0

50

100

150

200

250 LOW DENSITY - SCRATCHED GUIDE RING

Travel 2 Leakage (ppm)

Gasket Seating Stress (psi)

Thick

ness

(mm

)

Leak

age

(ppm

)

This shows leakage for a SW built to B16.20, likely sealing on the centering ring.

Leakage for the same gasket, but with a grooved centering ring, started above 10,000 PPM.

ASME B16.20- Appendix B

Install

20004000

5877

11694

16416

20464

31453

39774

60175

Recove

ry0.00

1.00

2.00

3.00

4.00

5.00

6.00

0102030405060708090100

LOW DENSITY - NORMAL GUIDE RING

Travel Leakage (ppm)

Gasket Seating Stress (psi)

Thick

ness

(mm

)

Leak

age

(ppm

)

Install

20004000

53119190

13498

17879

26592

35395

53204

Recove

ry0.00

1.00

2.00

3.00

4.00

5.00

6.00

0

50

100

150

200

250 LOW DENSITY - SCRATCHED GUIDE RING

Travel 2 Leakage (ppm)

Gasket Seating Stress (psi)

Thick

ness

(mm

)

Leak

age

(ppm

)

Many Refineries have a target gasket stress of 25,000 psi. Stresses above 40,000 psi are hard to achieve in common pipe flanges.

ASME B16.20- Appendix B

Install

20004000

55639640

1323816641

2403234091

54453

Recove

ry0.00

1.00

2.00

3.00

4.00

5.00

6.00

0102030405060708090100

HIGHT DENSITY - NORMAL GUIDE RING

Series1 Leakage (ppm)

Gasket Seating Stress (psi)Th

ickne

ss (m

m)

Leak

age

(ppm

)

Install

20004000

555810021

1316719414

2806538767

57424

Recove

ry0

1

2

3

4

5

6

0102030405060708090100HIGHT DENSITY - SCRATCHED GUIDE RING

Travel Leakage (ppm)

Gasket Seating Stress (psi)

Thick

ness

(mm

)

Leak

age

(ppm

)

This shows leakage for an “LE” SW built with a high density winding.

Leakage for the same gasket, but with a grooved centering ring.

ASME B16.20- Appendix B

GASKET SEALABILITY TEST FOR APPENDIX B

1) Methane Test at 20 Bar (290 psi)2) Use Volatile Organic Compound Analyzer (TVA1000) to detect

leakage3) Maximum Leakage is 10 PPM

ASME B16.20 GASKET STRESS

Remember this number (12,500 psi) and note the number of SW stresses that are below the line!!

Many sizes and classes of gaskets built to the ASME crush requirement will fail to meet minimum gasket sealing stress values.

ASME B16.20 Summary• APPENDIX B was created to provide a minimum

sealing criteria for gasket manufactures to achieve.• US Government agencies are currently requiring

certified low-leakage packing technology (100 PPM maximum) in consent decrees and will likely do the same for gaskets

• ASME B16.20 is slowly evolving as the demands of the industry change

Chevron Color Code for CD LE

TEADIT PLANTS

Teadit North America (Houston / USA)

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RESEARCH & DEVELOPMENTPacking Test Benches

Pump and Valve Simulation allows “real world” performance to be

evaluated

RESEARCH & DEVELOPMENT

Instrumented flange assemblies and testing equipment allows for

testing of gasket performance.

Gasket Testing

RESEARCH & DEVELOPMENT

Materials Testing

Chemical laboratory with dedicated staff for product development and determining Chemical Compatibilities.

RESEARCH & DEVELOPMENT

Image Analyzer Automated R&D Process Control

Lab Mixer and Calender

Thermal Analyzer (TGA)

Gasket Testing

Packing Testing StationGasket Test Benches

QUESTIONS?