BS ISO 18237:2017

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle of test
6 Apparatus
7 Accuracy of measuring instruments and test conditions
8 Summary of information required prior to testing
9 Dehydrator performance test
10 Reporting
11 Identification statement
Annex A (informative) - Test circuit
Annex B (normative) - Test fluid specification
Annex C (informative) - Test fluid quality checks
Annex D (informative) - Test results sheet giving
        example data
Annex E (normative) - Sampling and analysis procedures
Annex F (informative) - Example graph
Bibliography

Describes: - test equipment, test circuit and a procedure for the evaluation of the water separation capabilities of a dehydrator; - a procedure for preparing test fluid; - a procedure for obtaining and analysing the test fluid samples.

This document specifies:

• test equipment, test circuit and a procedure for the evaluation of the water separation capabilities of a dehydrator;

• a procedure for preparing test fluid;

• a procedure for obtaining and analysing the test fluid samples.

This document applies only to those dehydration units that can dry a hydraulic fluid to less than 20% of the hydraulic fluid’s water saturation level at the test temperature.

This document provides a test procedure that yields reproducible results for dehydrator water removal performance so that the performance of candidate units is compared on the same basis using the same test fluid.

This procedure can be used to test the dehydrator\'s capabilities on different types of hydraulic fluids at different conditions. Parts of the procedure might need to be changed to suit the hydraulic fluid’s characteristics. For example, the testing of hydraulic fluids with high water solubility (many synthetic and fire-resistant fluids) needs higher concentrations of water at the start of the test; the testing of hydraulic fluids with zinc-based additives needs modifications to the Karl Fischer analysis procedure. However, comparison of performance can be made under the conditions defined in this document.