Stacker Et.al.
Originally Posted by Jeeva
Could you kindly tell me what would be the approximate rope dia. used in a twin boom stacker of boom length 29m, Belt width 1400mm, 1500 TPH.The approx. weight of the boom shall be taken as 35T(dead +live load).
The problem is that no one can honestly tell or or should unless they know what the cross section o the sheaves is and would be foolish if they told you what size rope to purchase- it would be simpler for you if you looked at the specifications of the stacker if availabale or contact the builder with the machine serial number.
lzaharis ■
Tissue Tissue ..... All Fall Down
You display outrageoous effrontery to ask for a rope diameter based on the information shown. 
If the information is required for design then the work is sure to be dangerous. "..approximate rope diameter..." simply will jnot do when you are talking about cranes. 
If the information is for replacement purposes then you simply compare the existing rope to a manufacturer's catalogue and use your judgement to select the from UTS's available. 
Get a rope maufacturers catalogue, read it, relate it to you reeving diagram, revise your reeving diagram and then make sure you are working within the crane rules of your locality. 
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Rope Dia
The rope dia will be 5/8"steel core - if sheave pulley with total no of stand 4 are used;Dia. of sheave not less than 550mm at boom pivot end, aswell as at tower top pivot.
Regards,
ANM ■
Rope Guess
Dear Mr. Mukherjee,
just doing the roughest of estimations makes me wonder, how you arrive at such a conclusion as to state: 4 strands of 5/8" steel core wire rope (of unknown wire tensile strength and rope construction) will do it holding a 29 m boom of 35 t d&l load (of unknown geometry).
Doing such rough estimation myself and putting aside lots of things I'd be really tough to get to know in the first hand I feel nevertheless, that you maybe didn't consider any security factor in your statement. Please confer to attached sketch. Some simple and not really expensive (but there's still lots of yet weaker 5/8"' ropes around!) 5/8" steel core 6x36WS IWRC 1770 N/mm comes to a MBL of 161 kN. Whereas a good solid and $$$ spec rope PD SKZ 8 2160 N/mm arrives at 270 kN. It would MAYBE "hold", but never ever pass any survey of any authority whatsoever, I think. But, Mr. Mukherjee, what, if Mr. Jeeva buys a nice cheap wire rope of anything, just having the look of having a steel core? Would you please care to comment?
@ Mr. Jeeva
As there will be people passing under your stackers boom, please understand that engineering of a vital part like the rope system is a task of a (hopefully well) paid graduated engineer and NOT, repeat NOT a case for google search.
Regards
Roland ■
Re: Rope Selection In A Twin Boom Stacker
Roland,
I also wondered based on the information provided how Mr. Mukherjee could be so positive on what rope to use ■
Hard Hats Anyone?
Tell me it was a wind-up. 
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No Hard Hats At All, There.. I Fear
The point was not in the request but in the answer, with the word "sheaves" used I considered the rope system to be "winding", that was all.
Nevertheless one could surely repeat the commonplaces about qualified engineerung support, as such, independent of a static system or a winding one.
In the end, I do not know anything about Mr. Jeeva & how things are WTH HIM.
Roland ■
Re: Rope Selection In A Twin Boom Stacker
I totally agree with Roland. I just wouldn't fancy walling under a machine so designed....even with a hard hat.
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Working From First Principles
Nevertheless I'm GLAD^2 if anyone posts some request about an issue he/she isn't sure about. And about any substantial post and posts about posts.. even if I get a hint that I overdid it or that there's something basic to be seen & cared about before getting into detail. That's when first principles get polished up that will help some day in a tight corner of some office with some $$$ people around.
So the desire comes to FEEDBACK that would help to understand the developments of an issue, or to participate in the MOST valuable knowledge & approach of people who have really got around in this business..
Best regards & a good day
Roland ■
Re: Rope Selection In A Twin Boom Stacker
Hello Jeeva,
First one has to make layout drawing for boom portion, for functional need. The boom will have hinge support whether boom has luffing or no luffing. Non-luffing boom can have tie member with machine mast (upper end).
In case of luffing boom, support the boom by providing wire-rope loop between winch unit at machine centre upper portion, and sheaves attached to middle zone of boom. The winch winding unwinding will raise / lower (luff) the boom. Calculate the tension in rope, inclusive of mechanical advantage, to withstand boom moment around its hinge. The rope mechanical advantage, winch diameter, drive output rpm are complementary to each other to get required luffing speed along with the economy. The arrangement will enable to find tension in rope, and thereby the rope diameter.
Safety factor could be around 6 as ratio of rope breaking strength and rope working tension.
Regards,
Ishwar G. Mulani
Author of Book : Engineering Science And Application Design For Belt Conveyors (new print November, 2012)
Author of Book : Belt Feeder Design And Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Pune, India.
Tel.: 0091 (0)20 25871916
Email: conveyor.ishwar.mulani@gmail.com
Website: www.conveyor.ishwarmulani.com ■
Rope Selection in a Twin Boom Stacker
Dear Sir
Could you kindly tell me what would be the approximate rope dia. used in a twin boom stacker of boom length 29m, Belt width 1400mm, 1500 TPH.The approx. weight of the boom shall be taken as 35T(dead +live load). ■