{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/114661"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/114661","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"The use of silicone resins as non-wetting files on heating surfaces","abstract":"The effect of a single spray coating of 60.9% D.C. 801 silicone resin, with a 0.3% cobalt on the dry resin basis, on (1) the initial overall heat transfer coefficient, (2) the overall heat transfer coefficient under accelerated scale forming conditions, and (3) the corrosion resistance of 1.5” o.d. mild steel evaporator tubes, 12 B.W.G. was investigated. Preliminary tests were made with silicone resins D.C. 801, 993 and G.E. 9975, 9982, 9989 to select the resin to use in the above tests and to develop a precoating treatment for the evaporator tubes. The evaporator used for the investigation was an experimental, horizontal tube evaporator using the two 1.5” o.d., 21” mild steel tubes, 12 B.W.G., having an effective heating area of 1.113 ft.<sup>2</sup>. The operating conditions for the test were steam, 85% quality, at 45.75-46.25” Hg. abs. and body pressure of 7.8-8.5” Hg. abs. giving an effective temperature drop of 80-85°F. Evaporator feed for the “Normal Tests” was tap water; for the “Accelerated Tests” was gypsum solution, saturated at 55-65°F.; for the “Corrosive Medium Tests” was 3% NaCl solution. The coated tubes had an initial overall coefficient of heat transfer, “U”, 11% lower than that of commercially clean tubes. In the accelerated scale forming tests the “U” of the coated tubes decreased 24.6% in 32 hours; while that of the commercially clean tubes decreased 47.4% in 24 hours. The silicone resin coating protected the tubes from corrosion in 3% NaCl, boiling in natural convection, for the duration of a 24 hour test.","abstract_html":"The effect of a single spray coating of 60.9% D.C. 801 silicone resin, with a 0.3% cobalt on the dry resin basis, on (1) the initial overall heat transfer coefficient, (2) the overall heat transfer coefficient under accelerated scale forming conditions, and (3) the corrosion resistance of 1.5” o.d. mild steel evaporator tubes, 12 B.W.G. was investigated. Preliminary tests were made with silicone resins D.C. 801, 993 and G.E. 9975, 9982, 9989 to select the resin to use in the above tests and to develop a precoating treatment for the evaporator tubes. The evaporator used for the investigation was an experimental, horizontal tube evaporator using the two 1.5” o.d., 21” mild steel tubes, 12 B.W.G., having an effective heating area of 1.113 ft.&lt;sup&gt;2&lt;/sup&gt;. The operating conditions for the test were steam, 85% quality, at 45.75-46.25” Hg. abs. and body pressure of 7.8-8.5” Hg. abs. giving an effective temperature drop of 80-85°F. Evaporator feed for the “Normal Tests” was tap water; for the “Accelerated Tests” was gypsum solution, saturated at 55-65°F.; for the “Corrosive Medium Tests” was 3% NaCl solution. The coated tubes had an initial overall coefficient of heat transfer, “U”, 11% lower than that of commercially clean tubes. In the accelerated scale forming tests the “U” of the coated tubes decreased 24.6% in 32 hours; while that of the commercially clean tubes decreased 47.4% in 24 hours. The silicone resin coating protected the tubes from corrosion in 3% NaCl, boiling in natural convection, for the duration of a 24 hour test.","abstract_has_math":false,"creators":["Castles, John Thom"],"institution":"Virginia Polytechnic Institute","degree_name":"M.S.","degree_level":"masters","degree_discipline":"Chemical Engineering","degree_department":"Chemical Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1946,"date_issued":"1946","date_published":"1946","updated_at":"2026-07-22T22:19:19Z","subjects":[],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10919/114661","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Chemical Engineering"]},{"key":"dc:creator","label":"Author","values":["Castles, John Thom"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2023-04-20T14:53:31Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2023-04-20T14:53:31Z"]},{"key":"dc:date.issued","label":"Date","values":["1946"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Polytechnic Institute"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/114661"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The effect of a single spray coating of 60.9% D.C. 801 silicone resin, with a 0.3% cobalt on the dry resin basis, on (1) the initial overall heat transfer coefficient, (2) the overall heat transfer coefficient under accelerated scale forming conditions, and (3) the corrosion resistance of 1.5” o.d. mild steel evaporator tubes, 12 B.W.G. was investigated. Preliminary tests were made with silicone resins D.C. 801, 993 and G.E. 9975, 9982, 9989 to select the resin to use in the above tests and to develop a precoating treatment for the evaporator tubes. The evaporator used for the investigation was an experimental, horizontal tube evaporator using the two 1.5” o.d., 21” mild steel tubes, 12 B.W.G., having an effective heating area of 1.113 ft.<sup>2</sup>. The operating conditions for the test were steam, 85% quality, at 45.75-46.25” Hg. abs. and body pressure of 7.8-8.5” Hg. abs. giving an effective temperature drop of 80-85°F. Evaporator feed for the “Normal Tests” was tap water; for the “Accelerated Tests” was gypsum solution, saturated at 55-65°F.; for the “Corrosive Medium Tests” was 3% NaCl solution. The coated tubes had an initial overall coefficient of heat transfer, “U”, 11% lower than that of commercially clean tubes. In the accelerated scale forming tests the “U” of the coated tubes decreased 24.6% in 32 hours; while that of the commercially clean tubes decreased 47.4% in 24 hours. The silicone resin coating protected the tubes from corrosion in 3% NaCl, boiling in natural convection, for the duration of a 24 hour test."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["M.S."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The use of silicone resins as non-wetting files on heating surfaces"]}]}],"canonical_facts":{"dc:contributor.department":["Chemical Engineering"],"dc:creator":["Castles, John Thom"],"dc:date.accessioned":["2023-04-20T14:53:31Z"],"dc:date.available":["2023-04-20T14:53:31Z"],"dc:date.issued":["1946"],"dc:description.abstract":["The effect of a single spray coating of 60.9% D.C. 801 silicone resin, with a 0.3% cobalt on the dry resin basis, on (1) the initial overall heat transfer coefficient, (2) the overall heat transfer coefficient under accelerated scale forming conditions, and (3) the corrosion resistance of 1.5” o.d. mild steel evaporator tubes, 12 B.W.G. was investigated. Preliminary tests were made with silicone resins D.C. 801, 993 and G.E. 9975, 9982, 9989 to select the resin to use in the above tests and to develop a precoating treatment for the evaporator tubes. The evaporator used for the investigation was an experimental, horizontal tube evaporator using the two 1.5” o.d., 21” mild steel tubes, 12 B.W.G., having an effective heating area of 1.113 ft.<sup>2</sup>. The operating conditions for the test were steam, 85% quality, at 45.75-46.25” Hg. abs. and body pressure of 7.8-8.5” Hg. abs. giving an effective temperature drop of 80-85°F. Evaporator feed for the “Normal Tests” was tap water; for the “Accelerated Tests” was gypsum solution, saturated at 55-65°F.; for the “Corrosive Medium Tests” was 3% NaCl solution. The coated tubes had an initial overall coefficient of heat transfer, “U”, 11% lower than that of commercially clean tubes. In the accelerated scale forming tests the “U” of the coated tubes decreased 24.6% in 32 hours; while that of the commercially clean tubes decreased 47.4% in 24 hours. The silicone resin coating protected the tubes from corrosion in 3% NaCl, boiling in natural convection, for the duration of a 24 hour test."],"dc:description.degree":["M.S."],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["http://hdl.handle.net/10919/114661"],"dc:language.iso":["en"],"dc:publisher":["Virginia Polytechnic Institute"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["The use of silicone resins as non-wetting files on heating surfaces"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Chemical Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["M.S."],"thesis:institution_name":["Virginia Polytechnic Institute"]},"updated_at":"2026-07-22T22:19:19Z"}