scope:

This standard applies to Deep Tube Tunnel assets owned by or being constructed for LU.

This standard defines the requirements for Deep Tube Tunnel assets through the following lifecycle stages:

a) inception and design

b) construction, installation, testing and commissioning

c) inspection

d) analytical assessment

e) condition assessment and certification

f) maintenance

g) modification

h) strengthening and Renewal and

i) decommissioning.

Purpose

The purpose of this standard is to define the whole life cycle requirements for Deep Tube Tunnel and shaft assets. These assets are collectively defined as "Deep Tube Tunnels" in the Deep Tube Tunnels foundation document which is contained in LU standard S1042 'Asset Condition Reporting'. Throughout this document the term "Deep Tube Tunnels" shall be taken to refer to all of the Deep Tube Tunnel asset types listed in the Deep Tube Tunnels foundation document (including shaft assets).