Federal Opposition spokesperson for trade , Ian Macfarlane , called for a national audit of all gas pipelines .
Federal Opposition spokesperson for trade , Ian Macfarlane , highlighted the vulnerability of the single pipeline that carries WA 's gas from the North West Shelf .
Federal Opposition spokesperson for trade , Ian Macfarlane , called for a national audit of all gas pipelines , and highlighted the vulnerability of the single pipeline that carries WA 's gas from the North West Shelf .