Accession Number:

AD0609662

Title:

INFLUENCE OF PRESSURE ON SLUDGING OF P-C-437 STEAM CLEANERS,

Descriptive Note:

Corporate Author:

ARMY COATING AND CHEMICAL LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1964-11-19

Pagination or Media Count:

16.0

Abstract:

The purpose of this study was to determine whether or not the Federal Specification P-C-437, 21-24 lb. per sq. in. water softening test correlates with the practical steam pressures used in steam cleaning machines and, if not, to develop a high pressure temperature water softening test for Federal Specification P-C-437. Water softening tests at elevated pressures of 82 - 87 lb. per sq. in. were carried out in the gasoline oxidation bomb of A.S.T.M. Method D525-55. It was found that the sludging occurring at high temperatures cannot be determined by optical density or turbidity measurements, apparently because of the nonuniformity of the size of the sludge particles or aggregates. Evaluation of high temperature tests was accomplished by adjusting the test solution hardness to produce opalescence which could be measured by optical density. The water softening tests at 82 - 87 lb per sq in. were found to correlate with those at 21 - 24 lb. per sq. in. in the Federal Specification P-C-437 test. In view of this correlation and the laborious nature of the 82 - 87 lb. per sq. in. test, it seems advisable to retain the present 21 - 24 lb. per sq. in. test in Federal Specification P-C-437. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE