API Resources

API 6A Weld Neck Flange

API Pressure Classes

API 6A required equipment to be designed to one of the following maximum rated working pressures.
  • 2,000 psi

  • 3,000 psi

  • 5,000 psi

  • 10,000 psi

  • 15,000 psi

  • 20,000 psi

  • 2M psi

  • 3M psi

  • 5M psi

  • 10M psi

  • 15M psi

  • 20M psi

  • 13.8 MPa

  • 20.7 MPa

  • 34.5 MPa

  • 69.0 MPa

  • 103.5 MPa

  • 138.0 MPa

API 6A Material Class

Material Class
  • AA

  • BB

  • CC

  • DD

  • EE

  • FF

  • HH

General Service

General Service

General Service

Sour Service

Sour Service

Sour Service

Sour Service

Body - Bonnet - Outlets
  • Carbon or Low Alloy

  • Carbon or Low Alloy

  • Stainless

  • Carbon or Low Alloy

  • Carbon or Low Alloy

  • Stainless

  • CRA

Pressure Controlling Parts, Stems, Hangers
  • Carbon or Low Alloy

  • Stainless

  • Stainless

  • Carbon or Low Alloy

  • Stainless

  • Stainless

  • CRA

API 6A Temperature Class

Charpy Impact Requirements

Classification
  • K

  • L

  • N

  • P

  • S

  • T

  • U

  • V

-75°F (-60°C)

-50°F (-46°C)

-50°F (-46°C)

-20°F (-29°C)

0°F (-18°C)

0°F (-18°C)

0°F (-18°C)

0°F (-18°C)

PSL 1
PSL 2
PSL 3
  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • -

  • -

  • -

  • -

  • -

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • -

  • -

  • -

  • -

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J

  • 15 ft-lbf (20) J