What is the distance you should have between your fireworks and your audience?
I thought there used to be a diagram on the PyroUniverse page put I could not find it.
leeca
July 1st, 2006, 08:45 AM
What is the distance you should have between your fireworks and your audience?
I thought there used to be a diagram on the PyroUniverse page put I could not find it.It depends, you want all the ass holes as close as they can get, now the cool folks you want them way back..LOL
firework12
July 1st, 2006, 08:50 AM
Does anyone know where I can get the diagram?
shrapnel
July 1st, 2006, 08:52 AM
Leeca, one of your most informative posts ever!!! Great advice, 3 more posts to 1k! your headed for the pyro HOF dude.
PyrogearSteve
July 1st, 2006, 12:57 PM
NFPA 1123 calls for 70' for each inch in shell diameter. So that would be about 125' for 1 3/4" shells. Note the following important exception:
5.1.3.3.1 For chain-fused aerial shells, comets, and mines to be fired from mortars, racks, or other holders that are not sufficiently strong to prevent their being repositioned in the event of an explosive malfunction of the aerial shells, comets, or mines, the minimum required radius shall be double that required ...
So if your shells are strong enough to damage your racks and you are chain fusing, at least 250'. I think 250' can be a little light in this case, depending on the shells being used.
JoeRatman
July 1st, 2006, 07:46 PM
Just to make it clear, that 250' is the diameter of the circle. If you are talking distance of separation (between fireworks and audience), then it is the radius or 125'.
Also if you are using NFPA 1123, 2000 edition, all shells <=2" would have a minimum distance of separation (radius) of 140'. For shells bigger than 2" you mulitple by 70' to get the distance of separation. Ground items have a distance of separation of 75', unless it has a high hazard potential, in which case it is 125'.
The NFPA 1123, 2006 edition, has a minimum distance of separation of 75' for shells of <= 1". From that point you multiply the shell size by 70'.
PyrogearSteve
July 2nd, 2006, 10:12 AM
The 250' I was talking about was indeed a radius, not a diameter. It's 125' or 140' depending on how you interpret it, under normal circumstances, but double in the case of chain-fusing when you aren't sure your rack can hold up to a 'catastrophic malfunction'.
An example in class B would be a chainfused finale barrage of 3" salutes in racks. They should be twice the distance from audience and structures ... 420' rather than 210'. A few of the stronger C shells can have a similar risk when shot from racks, and really should be shot from a sandbox if they are going to be chainfused and closer than 250'.
pyrocasto
July 2nd, 2006, 12:31 PM
When shooting lose tubes morters I think you should go further than than 140ft minimum. I was shooting at about 150-160 with excal tubes sitting on a pallet the other night, boy it didnt feel good. If one fell toward the crowd with the height those things go it would have been bad. I'll be shooting around 200-250 away next.