This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Other Topics > Shops, Barns, Varmints, and Trucks
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


Cell phone towers and high winds?
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
DougG View Drop Down
Orange Level
Orange Level


Joined: 20 Sep 2009
Location: Mo
Points: 7946 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DougG Quote  Post ReplyReply Direct Link To This Post Topic: Cell phone towers and high winds?
    Posted: 13 Mar 2019 at 5:26pm
With this BOMB CYCLONE going thru Mo tonight and wins expected at 60 mph , was thinking about how much wind can a cell phone tower take? Cable kind and free standing?
Back to Top
Sponsored Links


Back to Top
ac fleet View Drop Down
Orange Level
Orange Level


Joined: 12 Jan 2014
Location: Arrowsmith, ILL
Points: 2212 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ac fleet Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2019 at 5:52pm
If they are designed properly, they should stand 150 mph. Our wind turbines are rated at that.
http://machinebuildersnetwork.com/
Back to Top
DougG View Drop Down
Orange Level
Orange Level


Joined: 20 Sep 2009
Location: Mo
Points: 7946 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DougG Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2019 at 5:59pm
Then the blades start flying off!?
Back to Top
Hubert (Ga)engine7 View Drop Down
Orange Level
Orange Level
Avatar

Joined: 12 Sep 2009
Location: Jackson Cnty,GA
Points: 6128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Hubert (Ga)engine7 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2019 at 8:18pm
Those towers can take a lot of wind if designed properly and they don't put too junk on them. The metal framework doesn't catch a lot of wind.

Bet those wind turbines are going crazy in high winds. I wouldn't want to be around when they go to slinging off blades though.
Just an old country boy saved by the grace of God.
Back to Top
Michael V (NM) View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: NM
Points: 2335 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Michael V (NM) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2019 at 8:53pm
https://m.facebook.com/story.php?story_fbid=2570636472953263&id=100000208058544

Here ya go..this is in NM, close to House , south of Tucumcari
Back to Top
Michael V (NM) View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: NM
Points: 2335 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Michael V (NM) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2019 at 8:55pm
Originally posted by Michael V (NM) Michael V (NM) wrote:

https://m.facebook.com/story.php?story_fbid=2570636472953263&id=100000208058544

Here ya go..this is in NM, close to House , south of Tucumcari

Darnit..can't get the link to work..but shows a wind gen tower blown over by high winds

Edited by Michael V (NM) - 13 Mar 2019 at 8:57pm
Back to Top
LouSWPA View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 11 Sep 2009
Location: Clinton, Pa
Points: 24021 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LouSWPA Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2019 at 9:43pm
I think they can 'feather' those props in high wind
I am still confident of this;
I will see the goodness of the Lord in the land of the living.
Wait for the Lord;
be strong and take heart and wait for the Lord. Ps 27
Back to Top
steve(ill) View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 11 Sep 2009
Location: illinois
Points: 77877 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2019 at 9:59pm
turbine only turns at a given RPM... if it starts to go faster, then rotate the blade angle , apply brakes, or shut it down and lock it...
Like them all, but love the "B"s.
Back to Top
DaveKamp View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 5641 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2019 at 11:47pm
Correct- the big turbines are basically all 'synchronous' generators... the blades turn at one speed, they're geared up to a generator who's windings are directly driving AC mains.  In order for the blades to turn FASTER, the line frequency MUST increase, but in order for a generator to do that, it would have to be capable of putting out enough current to accept the entire grid's load... an infinite load.

The blades have pitch control, basically to optimize lift to provide the most output possible at any given wind speed... and when wind speed exceeds the structure's design capacity, it feathers the blades out, applies brakes, and brings it to a stop.

Cell towers come in three flavors-  a vertical lattice-type tower (straight, like a broadcast tower) with guy wires, a tubular self-supporting, and a tapered lattice-type.  All three types are installed with wind survival criteria that includes loading of antennas, cabling, beacons, etc., suitable for the locality.  Coastal areas are set up for hurricane survival, while inland flats are designed for high wind.  Northerns include idc loading ratings as well.

Straight vertical towers with guy wires, they equip the tower with torque arms to keep the tower from twisting under wind, they'll take immense windload.

Tubular towers do really well, generally they'll flex a bit like a fishing pole.  Since cellular antenna arrays need to be very stable in direction and azimuth, companies will typically use tower structures WAY more rigid than normal, and as a result, the windload ratings are incredibly conservative.

Three legged lattice tapered towers, similar story- geometry keeps them really rigid. 
A common type like this is the Rohn SSV, I have one, legs are placed on 18 foot centers, legs are 10" diameter 1/2" wall, tapers to 8 ft centers 6" OD tube... five sections totalling 100ft tall, formerly used at a microwave relay site... when I stand up at the top, I can throw my weight around as hard as I want, it doesn't budge at all.Wink
Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.078 seconds.


Help Support the
Unofficial Allis Forum