scope:

This standard applies to Gravity Drainage System assets owned by LU.

This Standard defines the responsibilities involved during the life cycle of the assets and sets out the requirements for:

a) Inception and design

b) Construction, installation, testing and commissioning

c) Inspection

d) Analytical assessment

e) Condition assessment

f) Maintenance

g) Upgrading and Renewal

h) Decommissioning

j) Evidence of compliance

This standard replaces 2-01304-003 A1. The Standard has been re formatted and renumbered. There were no technical changes.

Purpose

The purpose of this Standard is to define the life cycle requirements for Gravity Drainage System assets. These assets comprise:

a) Track and off track drainage systems

I) Gravity pipes - Non Brick

II) Gravity pipes - Brick

III) Venting pipes

IV) Catchpits

V) Manholes

VI) Soakaways (Non Section 12 areas only)

VII) Flow control device

VIII) Storage tanks

IX) Channels

X) Syphons

XI) Gratings

XII) Pipe crossings up to 600 mm nominal bore

XIII) Open ditches (Non Section 12 areas only)

XIV) Screens (Non Section 12 areas only)

XV) Oil interceptors

XVI) Sumps

XVII) Interstices between the pipe bedding

XVIII) Trench backfill

b) Station drainage systems

I) Gravity pipes (including those carrying grey and/or foul waste from sanitary ware)

II) Venting pipes

III) Manholes

IV) Inspection chambers

V) Channels

VI) Gullies

VII) Gratings

VIII) Grease traps

IX) Oil interceptors

X) Drip trays

XI) Sumps

XII) Flow control devices

This standard does not cover building drainage, sanitary ware, roof drainage, guttering or down pipes. These are dealt with in LU Standards 1-068 (Station and Mechanical Services, Utility Provision and Energy Management), and EME-ST-01-018 (Mechanical Services Design).

Requirements for Pumping Systems are given in LU Standard 1-056 (Civil Engineering - Pumping Systems).

In defining requirements specifically applicable to Gravity Drainage System assets, this Standard complements LU Standard 1-050 (Civil Engineering - Common Requirements) that defines mandatory requirements generally applicable to all Civil Engineering assets including the Gravity Drainage System assets.

A supporting Manual of Good Practice G-052 gives guidance and historical information specific to LU Gravity Drainage System assets.