|Proposed Revision to Corrosive Sulfur Standard Will Provide More Sensitive Test
Certain insulating oils have been found to contain corrosive sulfur that can produce copper sulfide deposits as a function of time and temperature in operating equipment. These deposits on the copper and in the insulating paper will lead to loss of dielectric strength and eventual failure of equipment. However, a proposed revision to ASTM standard D 1275, Test Method for Corrosive Sulfur in Electrical Insulating Oils, will provide a means to certify that new or in- service oils either contain or do not contain corrosive sulfur at a dangerous level.
“The revision will provide a more sensitive test method for detecting corrosive sulfur in insulating oil,” says Thomas Lundquist, chair of ASTM International Committee D27 on Electrical Insulating Liquids and Gases. “The new method will provide a consistent means for laboratories to conduct or specify corrosive sulfur tests for insulating oils.” Lundquist also notes that modifications to required equipment may be necessary once the revision has been approved.
Lundquist says that an advantage of the proposed revision is that refiners and users of oil will be able to specify a sensitive corrosive sulfur test and laboratories conducting the test will have consistent repeatability with this method.
Test Method D 1275 is under the jurisdiction of Subcommittee D27.06 on Chemical Test. //
Technical Information: Thomas Lundquist, Salt River Project, Phoenix, Ariz.
ASTM staff: Christi Sierk
Upcoming Meeting: May 14-16, May Committee Week, Toronto, Ontario, Canada