- Author
-
Steihler, R. D.
- Title
- Solar Energy Systems- Standards for Rubber Hose Used with Liquids Above Their Boiling Points.
- Coporate
- National Bureau of Standards, Wahington, DC
- Sponsor
- Department of Energy, Washington, DC
- Report
-
NBSIR 81-2352
September 1981
28 p.
- Distribution
- Available from National Technical Information Service
- Keywords
-
hose
|
hose specification
|
hose immersion test
|
heat transfer liquid
|
glycol antifreeze stability
|
rubber hose
|
solar energy systems
|
solar energy
- Abstract
- Class AT hose in ASTM Standard D 3952-80, Specification for rubber hose used in solar energy systems, is specified for use with aqueous liquids above 100 deg. C. The lining of this hose is subjected to immersion tests at 100 deg. C. The purpose of this study is to determine whether immersion tests in aqueous liquids above maximum service temperature are necessary in the hose standard. The results of an interlaboratory test indicate that Class AT hose should be subjected to immersion tests above maximum service temperature. By inference, Class N hose used with a volatile heat transfer liquid at a temperature above its boiling point should be similarly tested above maximum service temperature. The study also indicates that ASTM Reference Coolant (ethylene glycol base) is not stable at 150 deg. C. In addition to the hose lining, the stability of the heat transfer liquid above maximum service temperature must be determined to assure satisfactory performance of the system. A proposed revision of ASTM D 3952 is included in the report. It provides for immersion tests above maximum service temperature of Class AT and Class N hose linings used with heat transfer liquids above their boiling points.