Radiation Shields

Tube furnaces are designed to heat a working tube that fits inside their tubular heated zone and contains the treated load. The radiation inside the hot zone of the furnace at high temperatures increases the end gas sealing flange temperature, as it freely reaches the flanges through the internal volume of the tube. To reduce or even eliminate this effect, Thermansys designs and offers radiation shields for use inside the tube.

Ordering Info

Features and Specifications

Radiation shield is positioned inside the working tube usually a couple of centimeters outside the hot zone in order to trap the radiation within the hot zone where is generated.

Thermansys is producing radiation shields with a thick disc geometry. The disc has periphery grooves in order process gases to flow through it and a thru hole at the center for a possible thermocouple probe passage, commonly used to sense the temperature at the middle of the working tube.

Material and Chemical Composition

The material of construction is dense high purity crystallized Alumina
(99.7% Al2O3). Crystallized Alumina presents high hardness, high abrasion (wear) resistance, fairly high chemical stability and can withstand chemical corrosion and erosion for most applications. Alumina considered to be a generally inert material at relatively moderated temperatures prevailing outside the hot zone, where the shield is positioned.

Technical Data

GSF-A Flanges with Hydraulic main port

Part Number	Tube Outside Diameter (mm)	Main Port Thread ISO Parallel	Periphery Threads ISO Tapered
GSF-A20	19-21	1/4 in	2 x 1/8 in
GSF-A25	24-26	1/4 in	2 x 1/8 in
GSF-A30	29-31	1/4 in	2 x 1/8 in
GSF-A35	34-36	3/8 in	2 x 1/8 in
GSF-A40	38-42	3/8 in	3 x 1/4 in
GSF-A50	48-52	1/2 in	4 x 1/4 in
GSF-A60	58-62	1/2 in	4 x 1/4 in
GSF-A70	68-72	1/2 in	4 x 1/4 in
GSF-A80	78-82	1/2 in	4 x 1/4 in
GSF-A90	88-92	3/4 in	4 x 3/8 in
GSF-A100	97-103	3/4 in	4 x 3/8 in
GSF-A110	107-113	3/4 in	4 x 3/8 in
GSF-A120	117-123	3/4 in	4 x 3/8 in
GSF-A130	127-133	1 in	4 x 3/8 in
GSF-A140	137-143	1 in	4 x 3/8 in

GSF-A Flanges with Clamp Flange main port

Part Number	Tube Outside Diameter (mm)	Main Port Clamp Flange	Periphery Threads ISO Tapered
GSF-A20TC	19-21	NW16KF	2 x 1/8 in
GSF-A25TC	24-26	NW25KF	2 x 1/8 in
GSF-A30TC	29-31	NW25KF	2 x 1/8 in
GSF-A35TC	34-36	NW40KF	2 x 1/8 in
GSF-A40TC	38-42	NW40KF	3 x 1/4 in
GSF-A50TC	48-52	NW50KF	4 x 1/4 in
GSF-A60TC	58-62	DN50TriC	4 x 1/4 in
GSF-A70TC	68-72	DN65TriC	4 x 1/4 in
GSF-A80TC	78-82	DN65TriC	4 x 1/4 in
GSF-A90TC	88-92	DN80TriC	4 x 3/8 in
GSF-A100TC	97-103	DN80TriC	4 x 3/8 in
GSF-A110TC	107-113	DN100TriC	4 x 3/8 in
GSF-A120TC	117-123	DN100TriC	4 x 3/8 in
GSF-A130TC	127-133	DN125TriC	4 x 1/2 in
GSF-A140TC	137-143	DN125TriC	4 x 1/2 in