Document ID: chunk:federal_register_of_legislation:F2016L00409:body:0:p35
Version: federal_register_of_legislation:F2016L00409
Segment Type: other
Provision Reference: 
Character Range: 89600–92493

design and other external factors such as wind.
Supervision by a competent person (for example structural engineer) during various stages
of the demolition work may be necessary in order to monitor any façade movement or cracking. The structure should be inspected after any unusual incidents such as heavy rain or wind, an earth tremor or accidental impact on the façade or its supports.

6.10 Storage tanks and pipelines
Before an above ground or underground storage tank and/or associated pipelines are removed
or demolished, any previous use should be determined and appropriate action taken to identify
and remove any hazardous chemicals. Delivery lines and vent pipes should be purged. The tank should be emptied and certified by a competent person as being free of gas, flammable vapours or other hazardous chemicals.
If work is to be undertaken on storage tanks then it is necessary to determine whether they
are a confined space for the purpose of the work. There are specific requirements in the
WHS Regulations for working in confined spaces and further guidance can be found in the
Code of Practice: Confined spaces.

General precautions
During the demolition of tanks and pipelines, the following precautions should be taken:
    * make sure that no flammable or toxic substances or combustible liquid is allowed to enter any drainage system or watercourse
    * if excavating underground tanks and/or pipelines, check the soil surrounding the tank/pipe to establish that it is not contaminated, either by leakage from the tank/pipe or by spillage, and
    * hot work (for example welding; oxy-acetylene cutting) should not be undertaken where there is a chance that flammable material may be present as a result of leakage/spillage
      or after cleaning out the tank/pipe.

Hazardous facilities
Special precautions should be taken during the demolition of major hazard facilities (MHF), chemical works, gas works and similar establishments. These types of facilities should be examined in conjunction with a competent person (for example a chemical engineer), in order
to determine the nature of any of the plant, chemical deposits and their influence on the method
of demolition or dismantling.
The removal of flammable materials and their new locations should be ascertained before any demolition work starts.

Containers that have held flammable or combustible material
Welding and cutting work on containers that have held flammable or combustible liquids, solids, gases or dusts can result in fire or explosion if the containers are not entirely free of these materials.

It is therefore important to conduct a rigorous cleaning process and that any instructions for cleaning are followed. Containers which have held any of the following materials are considered unsafe and hot work should not be started before they are properly cleaned:
    * petrol, kerosene, solvents,