116 in Vegas, 122 Bullhead AZ, 116 Phoenix,114 Yuma, 110 Tucson. 93 deg F is hot where I come from. Does any one pump in these conditions. I would think one would die or at least get hazard pay. 

Hello

Last week here in Toronto it hit 45 degrees c with the humidity it was terrible and I had to wait for loads and sometimes it was 60 min in between I managed to do all the jobs [house walls] and not plug up but I had to jack the hopper sides which was not bad only took a few min but when I washed I sucked 3 sponges to make sure the pipe was clean. I am use to it well sorta....lol I do know some other operators who waited to long had some boom parties going on. I do know this the mud was hotttt...lol oh well what do you do....

its always under a 100 here in hawaii..........

Here in the ATL we have a basic summer rule. Whatever the temperature is the humidity is the same.

Temp: 94 deg

Humid: 94 %

it is easier to keep track that way.

And I have spent a lot of time in AZ in the summer so don't give me the "dry heat" story line. The humidity in the oven is 0% but the food is cooked, ;~)

My hot weather theory

I think the simple answer is "when in doubt of waiting time, swing the boom around and recirculate". If you have to sit for a while in hot temparatures during a line pour without the ability to circulate. Keep the hopper full in between trucks and pump a little every few minutes. I know we have all had those longer then 1 hour waits, but the average wait on a tag load or a last truck is about 30-45 minutes unless you are in the middle of no-where. Preplan your pours!!!

I run a machine in Phoenix right now, And usually we work at night and are usually back in the yard at 10am.  I came from the northeast and the humidity is alot worse than the dry heat.

its 107 where iam at right now but most of the time iam off in the morning but theres days when i get off at 3 or 5 pm thats when it sucks thats when i use my boom as shade when i pump and if i sit for more then 15mins thats when i recirculate no boom parties for me. git your waterhose and have at it oh and a chipping gun its a life saver

Ive got one for you. Where i'm at it only hit 100 today but...... I did a line job, 350' we pumped 38 yards with a dose on wintercrete! Talk abopuit some unhappy workers. Mixer drivers were crying, finishers were getting behind and begging me to stop the pump. I pumped in these situations before so I wasn't worried, I was just not looking forward to my wash-up which took two hours. Now i'm enjoying my first cold one of the day! Be safe out there men drink lots of WATER.

my 2 cents... shy away from pumping in heat exceeding 100F. Contractor is asking for trouble, and its just one more thing to "blame" on the pump guy. Throw in chemical agents to slow the hydration, yak, yak, etc, etc. Better to be safe than sorry. Is there really any job that can't wait for more favorable climactic conditions? As some said, night work helps. Why chance it, let someone else lose the job, boom, system, etc. The smart pumper chills (pun intended) and will live to pump a cooler day. All this banter for what... just saying it is probably best not to pump or place mud in extreme weather unless absouletely necessary.

P.S. around 110 today where I work, so I do know a little about heat.

I live in N. Texas, This Yr it has been pretty nice, i dont think we've hit 100 yet. Although it has been raining most the summer. Alot of people have had to evacuate their houses because its flooded.  luckily i live on the 7th floor!!!!!!!!