fittings

1. Fittings

2. ANSI - American National Standards Institute
API - American Petroleum Institute
ASME - American Society of Mechanical Engineers
ASTM - American Society for Testing And Materials
CODES AND STANDARDS
ANSI -
Sizing

4. FITTINGS MATERIAL STANDARDS
A105 - Forged carbon steel fittings for high temperature services
A234 - Fittings of wrought carbon steel & alloy steel for moderate & Elevated temperature
A350 - Forged fittings of carbon steel & Low-alloy steel
A420 - Fittings of wrought carbon steel & alloy steel for low temperature services
A182 - Forged fittings of stainless steel & rolled alloy steel for high temperature services
A403 - Wrought austenitic SS piping fittings for high temperature Services
A181 - Carbon Steel Forgings, for General-Purpose

5. LARGE FITTINGS 2" AND ABOVE

6. SOCKET WELD SMALL FITTINGS 0.5" TO 1.5"

7. A105 - Forged Carbon Steel flanges for high temperature service
A 350 LF1 / LF2 – Forged fittings of carbon steel & Low-alloy steel
A 352 LCB – Specification for Steel Castings, Ferritic and Martensitic, for Pressure-
Containing
Parts, Suitable for Low-Temperature
A 182 - Forged or Rolled Alloy and Stainless Steel Flanges for High Temperature
A 707 - Forged, Carbon and Alloy Steel for Low Temperature Service
A181 - Carbon Steel Forgings, for General-Purpose
FLANGE MATERIAL STANDARDS

9. Flange Rating Selection
• ANSI B16.5 - Flange sizes 0.5-24”
• ANSI B16.47 - Flange sizes 26-60” - Series A & B
• -Contains Rating selection tables and Dimensional Values

10. Any leakage particularly in process equipment of a continuous plant may result in loss of life
and extensive damage to property besides affecting the economy. Hence joints where the
leakage of fluids can occur easily are required to be absolutely leak tight. But in case of
flanged joints, controlling the leakage of fluid without a sealing element between the mating
components is very difficult as it is not possible to machine the faces of the mating
components required to be perfectly flat and parallel. Moreover, they can not provide the
degree of interface contact essential for leak prevention of fluid even with very accurate
mechanical surfaces. Also, minute irregularities on these machined surfaces permit the
escape of the fluid under pressure. Hence to achieve a leak proof
flanged joints; a sealing element in the form of a Gasket should be introduced in between the
two mating components. The Gasket should be introduced in between the two mating
components.
Gaskets
 CAF Gaskets (compressed asbestos fiber)
 Spiral Wound Gaskets
 Ring Joint Gaskets
 Metal Jacketed Gaskets
 Rubber Gaskets
 Teflon Gaskets

11. Some important tips