We were on site last week with our confined space trained staff to upgrade an undersized package plant (installed under a kid's playground!) in a new housing development.
As with much of the work we do, everyone cheaper than us had been given a go at fixing it first, resulting in much wasted money.
In this case, a local tanker company had established a division specialising in taking money from people for their inexpert meddling. The company employ no qualified engineers, and consequently have no professional indemnity insurance. Before hiring someone unqualified and uninsured, you might want to ask yourself why insurance companies will not cover them for the work you are thinking of asking them to do.
As you can see from the condition of our staff's overalls, they left a mess behind them.
We undid the damage they had caused, and got the plant ready for commissioning in our programmed three days.