BS 7388:1991

Committees responsible
Foreword
Guide
0 Introduction
1 Scope
2 Specifications
2.1 General
2.2 Definition of leakage
2.3 Operating specification
2.4 Conditions applying to maintenance
2.5 Design specification
3 Design considerations
3.1 General
3.2 Number of pipe joints
3.3 Valve mounting methods
3.4 Pipe systems
4 Component choice
4.1 General
4.2 Tubing
4.3 Tube fittings
4.4 Welded fittings
4.5 Hoses and hose fittings
4.6 Adaptors
4.7 Coupling port threads and their sealing methods
4.8 Self-sealing couplings
4.9 Reservoirs
4.10 Cylinders
4.11 Pumps and motors
4.12 Valves
5 Design for maintenance
5.1 General
5.2 Accessibility
5.3 Removal of components for service
5.4 Isolating sections
5.5 Filters
5.6 Drip trays and drain tanks
5.7 System filling
5.8 System draining
5.9 System cleaning (flushing)
5.10 External cleaning after spillage or as routine
5.11 Remaking pipe joints
5.12 Self-sealing couplings
6 Pipework design
6.1 General
6.2 Installation and cleaning
6.3 Vibration
6.4 Pipe stresses
6.5 Location of pipe couplings
6.6 Hoses
7 Seals
7.1 Static seals
7.2 Dynamic seals
8 Installation
8.1 General
8.2 Off-site work (preliminary build and test)
8.3 On-site installation
8.4 Production line installation (where the system is
      part of product)
9 Commissioning and testing
9.1 General
9.2 Commissioning
10 Maintenance
10.1 General
10.2 System evaluation
10.3 Preventive maintenance
10.4 Maintenance routines
11 Fluid spillage
11.1 General
11.2 Prevention of spillage
11.3 Precautions should spillage occur
12 Responsibilities
12.1 Designers' responsibilities
12.2 Customers' responsibilities
12.3 Suppliers' responsibilities
Appendices
A Leakage categories
B Cleaning methods and materials
Table
1 Guide to leakage categories
Figures
1 Example of a 24 degree bite type compression
      coupling
2 Example of a 37 degree flare type compression
      coupling
3 Example of an 'O'-ring type compression coupling
4 Example of welding steel pipe to welding nipple
5 Four-bolt split flange
6 Four-bolt square flange
7 Four-bolt square welded flange
8 Example of a re-usable hose fitting
9 Example of a swaged hose fitting
10 G thread (BSP) 60 degree cone fitting (with and
      without 'O'-ring sealing)
11 JIC 74 degree cone fitting
12 Flat face 'O'-ring seal fitting
13 Staple fitting
14 Examples of coupling port thread sealing methods
15 Examples of good and bad pipe runs

Design of hydraulic systems and their installation with a view to minimizing external leakage of fluids.

This British Standard provides guidance on the design of hydraulic systems and their installations with a view to minimizing external leakage of fluids and is intended to provide guidance on the way the design specification should define how the customer’s requirements in respect of leakage are to be met.

This standard encompasses system specification, circuit design considerations, component specification, pipework design, installation procedures and commissioning.

This standard is not concerned with aspects of systems other than those which relate to leakage and excludes aerospace application and design of hydraulic components.

NOTE The publications referred to in this standard are listed on page 28.