Richards Thermocouple and Temperature Sensor Catalog 16

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Metal Tube Flange (FS & RF) Assemblies
Stainless Steel ANSI Blind Flanges are available with a Raised Faced ( RF) or Flat Faced ( FS) gasket surface. A gasket gives a gas
tight seal. The more commonly used Raised Faced flanges are the low pressure 150# Class or the high pressure 300# Class. All
Raised Faced flanges are forged and meet ASTM A182 and ANSI/ASME B16.5 specifications. Raised faced thicknesses above the
flange face are 1/16” (1.59 mm) for the 150 and 300 pressure classes and 1/4” (6.35 mm) in the 400, 600, 900, 1500, and 2500 clas-
ses.
Low pressure stainless steel Flat Faced (FS) 150# Class flanges, also known as the Manufacturers Standardization Society (MSS)
flanges, are machined from castings. These Flat Flanges meet ASTM A351 and conform to MSS SP-42 for diameter and bolt holes
and also MSS SP-51 for thickness. ANSI flanges (Flat & Raised Faced) are usually machined from 316 Stainless Steel stock. The
316 Stainless Steel contains more Nickel and has the addition of Molybdenum which gives it better corrosion resistance than 304
Stainless Steel.
Part Numbers are composed of : Tube-Tube Length “P”- Flange Number (see table)-Material Code (see table)- ”U” Length– Head
Example: 722-18-FS2415-CS-12-SH Assembly (FS = Flat Faced - Carbon Steel)
316SS flanges are standard (and the Material Code may be omitted from the part Number).
Example: 722-18-RF2415-12-SH Assembly (pictured above is Raised Face)
Note: Blind Flanges are drilled for the required Protection Tube pipe size.
Raised Face (RF)
P
U
Flange
Raised Face
FS & RF
Part
Number
Pipe
Size
Lbs /
Inch
Flange
Diameter
RF
Diameter
Flange
Thickness,
minimum
Bolt Circle
Diameter
Number
of Bolts
Bolt
Hole
Diameter
1615
2415
2430
2460
4815
6415
32150
1”
1 1/2”
1 1/2”
1 1/2”
3”
4”
2”
150
150
300
600
150
150
1500
4.25
5.00
6.12
6.12
7.50
9.00
8.50
2”
2.88”
2.88”
2.88”
5.00”
6.19”
3.62”
0.56
0.69
0.81
0.88
0.94
0.94
1.50
3.12
3.88
4.50
4.50
6.00
7.50
6.50
4
4
4
4
4
8
8
0.62
0.62
0.88
0.88
0.75
0.75
1.00
Flange Material
Codes Selection
Material Cod
304 Stainless
316 Stainless
446 Stainless
Carbon Steel
Inconel 600
Inconel 601
08
16
07
CS
09
06
MC = Material Code from this table. Other Materials available upon
request. Also see Material Code table on page 97 (Thermowells).
Partial Flange Table. For the complete
table, see page 199.
Straight Assemblies - Mounting Attachments
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TS
Mountings
4
A welded bushing is welded directly on the protection tube. The tube can then be screwed into the furnace to give a gas tight
seal. Protection tubes with a welded bushing are more expensive than threaded fittings since the alloy extends outside the furnace.
Also the bushing must be replaced with the tube. The standard outside thread size on a welded bushing is 1 1/4” NPT. 1/2” NPT weld-
ed bushings are used as standard outside threads on 1/4” and 1/8” pipe sizes. Other sizes can be ordered by specifying the size in
1/16ths of and inch. See under accessories for lengths of bushings.
Example: A 1 1/2” x 1/2” 1/2” NPT welded bushing would be a W2408. See “Bushings” under “Accessories” for more details.
To add a welded bushing to a metal assembly, add (W) to the part number followed by the immersion “U” length
Example: Metal: 8K4-734XH-36-W-24-SH (36”, #7 alloy metal tube assembly, 1 1/4” NPT welded bushing, 24” immersion (U)
length measured from the tip of the tube to the bottom of the bushing.) The immersion length (U) is shown on the figure above. In
most cases the tube should extend into fluids at least six times the outside diameter of the tube. If the tube is going into a gas, it
should extend a minimum of eight times the outside diameter of the tube.
Metal Tube
Welded Bushings (W)
P
U