scope:

This standard applies to the air distribution system from the sub station pressure reducing valve up to and including flexible hoses feeding individual items of trackside equipment and all feeds to interlocking machines.

This standard does not apply to the compressor, nor to its associated pressure reducing valve, nor to pipework provided for non signalling equipment. These, and the maintenance boundary demarcation, are detailed in S1105, Power Services Contract - Performance Specification, which also specifies Compressed Air Quality and Pressure.

The primary user of this standard is the Asset Steward.

This standard supersedes E7155 A4, which is withdrawn.

Purpose

This standard defines the minimum maintenance requirements for the air distribution system used on London Underground.

It is not normally intended to define methods of maintenance, but where the standard does so it is for particular reasons and the Asset Steward shall adhere to those methods. Workshop overhaul is not covered by this standard.