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Typical
Protection
Pipe
O.D.
I.D.
Lbs/
Kg./
Application
Tube Alloy
Size
Inches mm Inches mm Foot Meter
Type K
601
Maximum service tem-
perature 2300°F (1260°C) in
oxidizing atmospheres. good
resistance to sulfidizing
atmospheres.
#6 Seamless Nickel Alloy
Nickel 60.5%, Chromium 23%
Iron 14%, Aluminum 1.4%
Copper .5%, Manganese .5%
Silicon .2%, Carbon .05%
1” Std
3/4” Std
1/2” Std
3/8” Std
1.32
1.05
.84
.68
33.5
26.7
21.3
17.2
1.05
.82
.62
.49
26.7
20.8
15.7
12.4
1.80
1.20
.91
.61
2.66
1.79
1.35
.91
601-*
634-*
622-*
638-*
446SS
Maximum service
temperature 2100°F (1150°C)
in oxidizing atmospheres.
Excellent resistance to
sulfidizing atmospheres ,
corrosion, scaling, and
abrasion.
#7 Seamless Stainless Steel
Chromium 23-27%
Manganese 1.5%
Silicon 1%, Nitrogen .25%
Carbon .20%, Sulphur .030%
Phosphorous .040%
Iron (Balance)
1” Std
3/4” XH
3/4” NPT
1/2” Std
1/2”XH
3/8” Std
1/4” XH
1.32
1.05
1.25
.84
.84
.68
.54
33.5
26.7
31.8
21.3
21.3
17.3
13.7
1.05
.74
.56
.62
.55
.49
.25
26.7
18.8
14.2
15.7
14.0
12.4
6.4
1.68
1.47
3.20
.85
1.09
.57
.42
2.50
2.19
4.76
1.27
1.62
.85
.63
701-*
734XH-*
734SP-*
722-*
712XH
738-*
714XH-*
304SS
Maximum service
temperature 1600°F (871°C) in
oxidizing atmospheres.
#8 Seamless Stainless Steel
Chromium 19%
Nickel 10%,
Manganese 2%
Silicon 1%, Carbon .08%
Phosphorous .045%
Sulphur .030%
Iron (Balance)
1” Std
3/4” Std
3/4” XH
3/4” NPT
1/2” Std
1/2” XH
3/8” Std
1/4” Std
1/8” Std
1.32
1.05
1.05
1.25
.84
.84
.68
.54
.41
33.5
26.7
26.7
31.8
21.3
21.3
17.3
13.7
10.4
1.05
.82
.74
.56
.62
.55
.49
.36
.27
26.7
20.8
18.8
14.2
15.7
14.0
12.4
9.1
6.9
1.68
1.13
1.47
3.20
.85
1.09
.57
.42
.24
2.50
1.68
2.19
4.76
1.27
1.62
.85
.63
.36
801-*
834-*
834XH-*
834SP-*
822-*
812XH-*
838-*
814-*
818-*
600
Maximum
service
temperature 2100°F (1150°C)
in oxidizing atmospheres. Avoid
sulfidizing atmospheres.
#9 Seamless Nickel Alloy
Nickel 76%
Chromium 15.5%
Iron 8%
Manganese .5%
Silicon .2%,
Copper .2%
Carbon .08%
1” Std
3/4” Std
3/4” XH
3/4” NPT
1/2” Std
1/2” XH
3/8” Std
1/4” Std
1/8” Std
1.32
1.05
1.05
1.25
.84
.84
.68
.54
.41
33.5
26.7
26.7
31.8
21.3
21.3
17.2
13.7
10.3
1.05
.82
.74
.56
.62
.55
.49
.36
.27
26.7
20.8
18.8
14.2
15.7
14.0
12.4
9.1
6.9
1.80
1.22
1.51
3.20
.91
1.17
.61
.46
.26
2.66
1.81
2.25
4.76
1.35
1.74
.91
.68
.39
901-*
934-*
934XH-*
934SP-*
922-*
912XH-*
938-*
914-*
918-*
800
Maximum service
temperature 2100°F (1150°C)
in oxidizing or reducing
atmospheres. Good resistance
to sulfidizing
#10 Seamless Nickel Alloy
Nickel 35%, Chromium 23%
Iron 39.5%, Manganese 1.5%
Silicon 1%, Copper .75%
Aluminum & Titanium .6%
Carbon .1%
1” Std
3/4” Std
1/2” XH
1.32
1.05
.84
33.5
26.7
21.3
1.05
.82
.55
26.7
20.8
14.0
1.72
1.15
1.12
2.56
1.71
1.66
1001-*
1034-*
1012XH-*
Replace the * in the above part numbers with the required length as the suffix.
Protection tubes are stocked in multiples of 6 inches starting at 12 inches, although any length can be specified.
Richards metal thermocouple protection tubes are manufactured using our special processes to maximize the tube service life. This is
evident by our uniquely shaped, heavy mass tips which have been proven in the field for years. Prior to shipment, each tube goes through our
Hydro-Pneumatic testing to check for porosity. Protection tubes are typically made with a closed tip and one threaded on the cold end, but
they are also available with open ends and various threading options.
Open Tube Examples:
The part number
601-YOBE-12
signifies a 1” O.D., Alloy 601, Open Both Ends, and no threads.
The part number
601-OBE-12
signifies a 1” O.D., Alloy 601, Open Both Ends, and one end threaded.
The part number
601-OBE2T-12
signifies a 1” O.D., Alloy 601, Open Both Ends, and both ends threaded.
Closed Tube Examples:
The part number
601-12
signifies a 1” O.D., Alloy 601, closed one end, and one end threaded.
The part number
601-12-NT
signifies a 1” O.D., Alloy 601, closed one end, and no threads.
Metal Tubes - Nominal Pipe Thread (NPT)
Page 90
Phone: 617.527.4385 Fax: 617.964.3746 Email:
sales@asrichards.com