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Appendix A
Revision – November 2004 Page A - 3
5.5 ANSI/ASME B46.1 - 1985 - Specification for surface texture-surface
roughness, waviness, and lay.
6.0 Procedure:
6.1 General Requirements
6.1.1 All tube and bar stock shall be produced from ASTM grade TP316L raw
material unless specified in the purchase order. Tubing sized smaller than 3"
shall be seamless and larger than 3" may be welded.
6.1.2
Stainless steel tubing shall be bright annealed at the producing mill in a dry
hydrogen atmosphere (dewpoint <-40°C) or vacuum annealed (10 micron
Hg) to a Rockwell Rb 90 maximum hardness.
6.1.3
The sulfur content of fittings and tubing shall be in the range of 0.005-0.017
percent; type 316L VAR and VIM\VAR a maximum of 0.005%. VAR or
VIM/VAR will be specified in the purchase order. This range is an actual
range and does not allow for rounding of numbers as set forth in
ASTM A269.
6.1.4
Tubing shall conform to the requirements of ASTM A269 for sizes one-half
inch diameter and larger and ASTM A632 for sizes smaller than one-half
inch, except where specified differently within this specification.
6.1.5
Bar stock shall conform to the requirements of ASTM A479, except where
specified differently within this specification.
6.2
Dimensional Tolerance Requirements:
6.2.1 End connections on tubing and fittings shall be faced and squared to plus or
minus one-half degree for sizes 1/4" through 3/4" inclusive. Squareness of
1" and larger shall be +.006". All ends shall be fully prepped and suitable for
installation with automatic orbital welding equipment.
6.2.2
Acceptable dimensional tolerances shall not exceed the limits listed below:
Dimension Component Tolerance
Linear Fittings +- .015"
Angular Fittings +- 1/2 degree
Wall Thickness Tube and Fittings +- 10%
(including saddle area of tees)