CFM requirements to push a pull string

[Cow]

Also found one should install the pull line ASAP after installing underground raceways even if not intending to pull conductors right away. Condensation or any other reason to have water in the line makes blowing a line in more difficult if you wait too long and this water has accumulated.

I agree. We do wait a day for string installation on long runs though.

A few years ago, we had a 1000' run of 4" that had a measuring string installed right after conduit installation. A couple days later we went to pull the rope in and we found the measuring string was stuck, from excess glue oozing through some of the joints into the conduit.

 

[tkb]

Ya I saw that one but I don't think it has the right adapter for diameters under 2.5"

All you need is the greenlee adapter to use this on smaller sizes.

Greenlee 25646 :: Adapter Cone :: PLATT ELECTRIC SUPPLY

Adapter Cone, Conduit Diameter: 1/2" - 1", Cat #: 25646, Mfr: Greenlee

www.platt.com

 

[roger]

I had a thomas jet line which is a bottle of compressed gas for blowing lines.
The greenlee line vac was overall the best, but of course needs power, it was much better than a shop vac, it could blow or vacuum.
A generator and vac would work.

A CO2 tank is what we always used too. They can be dangerous though, at one company I worked for we had a guy pull the trigger without having hold of end of the hose and lost an eye.

Gardner Bender JO25 Powr-Pak Co2 System

The Gardner Bender JO25 is a complete, self-contained conduit fishing system that does not require an electrical power source. The system includes a metered operating valve to control CO2 volume and minimize waste, as well as a locking pull ring to prevent accidental discharge.

www.toolup.com

Roger

 

[ptonsparky]

A CO2 tank is what we always used too. They can be dangerous though, at one company I worked for we had a guy pull the trigger without having hold of end of the hose and lost an eye.

Gardner Bender JO25 Powr-Pak Co2 System

The Gardner Bender JO25 is a complete, self-contained conduit fishing system that does not require an electrical power source. The system includes a metered operating valve to control CO2 volume and minimize waste, as well as a locking pull ring to prevent accidental discharge.

www.toolup.com

Roger

CO2 makes one heck of a mess if the pipe has mud or water in it and can put the mouse through one side of a hollow core door.

 

[roger]

CO2 makes one heck of a mess if the pipe has mud or water in it and can put the mouse through one side of a hollow core door.

Yes it can but normally it only takes once to learn it. It can also put an old style scotch red wire nut into orbit.

Roger

 

[kwired]

HVAC guys were purging/pressure testing their system in a school - larger bank of compressors that supplied several room modules all on one refrigeration circuit. they had over 100PSI in the system already when a pro-press fitting that never got crimped finally let go. I was across the gym and in another area, was really loud and still scared the hell out of me at the distance I was from it. School maintenance man was pretty close to it though...