|
U.S. Gauge recommends the use of a thermowell in conjunction with a bimetallic thermometer when the application involves a corrosive medium, high pressure, or high flow velocity.
Some specific uses include protection for unarmored liquid-in-glass test thermometers or other temperature sensing elements with a maximum diameter of .25”. These #20 gauge bimetallic thermowells meet or exceed SAMA specifications and are also available in heavy duty, flange, socket weld, and Van Stone models. Standard thermowells are stepped to 1/2” OD, except for 2-1/2” insertion. Straight shank models are also available. The standard process connection sizes are 1/2-14 NPT and 3/4-14 NPT, with other sizes available. Materials of construction include 316L stainless steel (standard), 304 stainless steel, and brass (ASTM B-16). A cap and chain for keeping the thermowell bore clean when not in use are available upon request.
STANDARD TOLERANCES
-
LENGTHS
±1/16” on lengths 12” or less
±1/8” on lengths 12” or over
-
WELLS 30” OVERALL LENGTH AND OVER
Solid bored type will be drilled thru end, plugged, and heli-arc welded; Built-up design must be specified beyond 42-1/4” overall length
-
OD TOLERANCES
Fractional
±.015; Decimal: ±.005 on .000 place
±.01 on .00 place BORE ID
+.005; -.003; We try to stay within ±.002
-
END THICKNESS
Gun drill bottom; 1/4” to bottom ±1/16”; 3/16” minimum end thickness
-
CONCENTRICITY OF BORE TO OD
±10% of minimum wall thickness
-
WETTED SURFACES FINISH
Standard finish 60-100 Ra; 16-32 Ra available; 4-10 Ra mirror polish available
-
RADIUS UNDER THREADS AND FLANGES
1/8” is standard, ±1/16 in.; 1/16” on Van Stone type
-
MALE THREADS (NPT)
±1 turn on thread gage
-
FEMALE THREADS
1/2” NPSM standard; 1/2-14 NPT available upon request; go gauge to 5/8” depth of thread; no go gauge 2 turns maximum
-
END OF WELLS
Break corners; no burrs
-
LAGGING EXT.
On screwed wells; left as hex stock (not turned); exception–when hex is not available in special materials
-
STAMPING
Stamped onto hex or round facing open end of well; material code identification; tag numbers}
-
FLANGED WELLS
Made in accordance with ANSI B16.5; raised face is serrated 125 Ra; smooth face must be specified on order if needed
-
FRONT J
Groove welds are 1/4” wide by 1/4” deep; welds are machined, leaving 1/8” radius; rear welds are 1/8” wide by 1/8” deep "V"; welds are machined, leaving 1/4” radius; full penetration welds are available upon request and must be specified
|
|
