Re: Side booms rigging

On Tue, 29 Jan 2008 15:20:57 -0000, Rob <run2@[EMAIL PROTECTED]
> wrote:

> I'm working with a friend at a new facility. The architects want to
> install: "18' lighting pipes referred to as "pipe booms"...They are to
> be attached to the floor using a threaded flange and tied of using a
> heavy duty rope to a location above the stage"
>
> My concern and the concern of the lighting install company is:
> "...that the pipe is too long and has too much load for the specified
> flange attachment (5" floor flange). We recommend a larger floor base
> which will offer better stability for a pipe of that length and
> eliminate the chance of causing damage to the floor and also the
> possibility of a more rigid attachment point for the top of the pipe
> in addition to the rope tie off."
>
> The architects claim this is a 50 year old practice used in other
> sites. I think it sounds suspect-- it would not be my choice. Any
> comments?


That's pretty standard practice for a bomm with conventionals on it in the
 
UK. If something stiffer is required the top of the pipe is scaff braced, 

If that's not stiff enough you need truss anyway. Using a larger base is a
 
trip hazard. The tops normally attached with something fire rated though, 

not heavy rope. If your floor can't take the point load then it's the  
wrong floor.