Astm D 4174 – 89 (Reapproved 1999) pdf free download

Standard Practice for
Cleaning, Flushing, and Purification of Petroleum Fluid
Hydraulic Systems1

This standard is issued under the fixed designation D 4174; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This practice is intended to aid the equipment manufacturer, the installer, the oil supplier, and the operator in coordinating their efforts toward obtaining and maintaining clean
petroleum fluid hydraulic systems. Of necessity, this practice is
generalized due to variations in the type of equipment, builder’s practices, and operating conditions. Constant vigilance is
required throughout all phases of design, fabrication, installation, flushing, testing, and operation of hydraulic systems to
minimize and reduce the presence of contaminants and to
obtain optimum system reliability.

1.2 This practice is presented in the following sequence:
Scope 1
Referenced Documents 2
Significance and Use 3
Definitions 4
Types of Contamination 5
General 5.1
Water 5.2
Soluble Contaminants 5.3
Insoluble Contaminants 5.4
Lodged Contamination
Suspended Contamination
Contamination Control 6
General 6.1
Initial Filling 6.1.1
In-Service Units 6.1.2
Connection of Contamination Control System 6.1.3
Piping to Contamination Control System 6.1.4
Contamination Control Procedures 6.2
Full Flow Contamination Control 6.2.1
Bypass Contamination Control 6.2.2
Batch Contamination Control 6.2.3
Contamination Control Processes 6.3
Gravity 6.3.1
Mechanical 6.3.2
Supplementary Methods 6.3.3
Limitations of Contamination Control Devices 6.3.4
Storage 7

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