Any riggers here?

[Minerva]

What is better three 300 ton cranes or a single 1000 ton crane pulling load across tracks with no perceivable incline?

 

[imported_yetti]

oops. i'm a dumbass.

 

[RGN]

who you callin' a rigger?

 

[AlienCraft]

Originally posted by: Minerva
What is better three 300 ton cranes or a single 1000 ton crane pulling load across tracks with no perceivable incline?

What is the load, and it's weight? What do you mean "across tracks" and how far does the item have to be moved? What are the surroundings ? ie. homes, schools, populated area or rural, cows and grass.

< Stageing Rigger trained under Rocky Paulson of Stage Rigging Inc.

 

[HamburgerBoy]

Originally posted by: yetti
oops. i'm a dumbass.

Did you misread "rigger" as well?

 

[Minerva]

Positioning trolley rigs for loading heavy machine parts through repair access openings cutout on the hull of ships. They want to use multiple lines and the rig at the end has a large reach. The service cranes at the drydock are not capable of handling two parts they want.

 

[spaceman]

rigger please..

 

[sundev]

Originally posted by: ncircle
rigger please..

Hahaha! Genius.

 

[Specop 007]

Whats the going rate for riggers these days? We're obviously going to need a few more riggers to get this job done. Someone find me some riggers, STAT!!

 

[Schadenfreude]

Originally posted by: sundevb

Originally posted by: ncircle
rigger please..

Hahaha! Genius.

:thumbsup:

 

[sonoma1993]

they are going for 100 million each. lol

 

[jadinolf]

Originally posted by: RGN
who you callin' a rigger?

YEAH!

 

[shilala]

It's damn near impossible to see in my head what you're trying to do.
The simplest route is always the best.
Go with one rig.

 

[sonoma1993]

minerva is one hot women.

 

[AlienCraft]

Originally posted by: Minerva
Positioning trolley rigs for loading heavy machine parts through repair access openings cutout on the hull of ships. They want to use multiple lines and the rig at the end has a large reach. The service cranes at the drydock are not capable of handling two parts they want.

One crane might do it, however, another similar capacity should probably be used to control any movement. The "event moment" is the most dangerous aspect. This is when the load starts to swing due to pendulum effects. The weight where the crane is concerned will vary and this may cause crane failure.
Also in order to SAFELY carry the load AND move the crane should be rated at at least 3x load weight.
All the loads I've ever installed above people have been engineered at 6x load weight.

Overkill at the install is better than killing anyone at the install. < Allen's Rigging Rule #1.

 

[arsbanned]

Weight of load is key here.

 

[arsbanned]

Originally posted by: AlienCraft

Originally posted by: Minerva
Positioning trolley rigs for loading heavy machine parts through repair access openings cutout on the hull of ships. They want to use multiple lines and the rig at the end has a large reach. The service cranes at the drydock are not capable of handling two parts they want.

One crane might do it, however, another similar capacity should probably be used to control any movement. The "event moment" is the most dangerous aspect. This is when the load starts to swing due to pendulum effects. The weight where the crane is concerned will vary and this may cause crane failure.
Also in order to SAFELY carry the load AND move the crane should be rated at at least 3x load weight.
All the loads I've ever installed above people have been engineered at 6x load weight.

Overkill at the install is better than killing anyone at the install. < Allen's Rigging Rule #1.

Re: "event moment" . Aren't you making assumptions about the load, the details of which we have no knowledge of?

 

[skyking]

Cranes don't pull horizontal loads well. They either lift or break. Are you tugging something on a trolly or truck set, or actually lifting and swinging a load?
Before you expect any constructive answer, you'll need to diagram the job with dimensions, weights, clearances, obstacles. Need to establish what the load will tolerate.
Some loads are fairly insensitve, and others can only be picked with engineered spreader sets, or they will fail.
Two and three crane picks are best done only as lift and lower, such as picking up a heavy component off a lowboy and setting it down. It takes a special rigger boss with many years of experience to coordinate a multi-crane big pick with swing and boom action. Disaster is only a moment away with multiple cranes. One miscue and too much of the load gets onto one machine. Either the load itself comes apart at that point, or you get a nice little cascade failure of the cranes. The side loads are the hardest to manage, it seems.

 

[AlienCraft]

Originally posted by: skyking
Cranes don't pull horizontal loads well. They either lift or break. Are you tugging something on a trolly or truck set, or actually lifting and swinging a load?
Before you expect any constructive answer, you'll need to diagram the job with dimensions, weights, clearances, obstacles. Need to establish what the load will tolerate.
Some loads are fairly insensitve, and others can only be picked with engineered spreader sets, or they will fail.
Two and three crane picks are best done only as lift and lower, such as picking up a heavy component off a lowboy and setting it down. It takes a special rigger boss with many years of experience to coordinate a multi-crane big pick with swing and boom action. Disaster is only a moment away with multiple cranes. One miscue and too much of the load gets onto one machine. Either the load itself comes apart at that point, or you get a nice little cascade failure of the cranes. The side loads are the hardest to manage, it seems.

This is what I was addressing in general terms. Rating a crane at 6x load will reduce the possibility of cascade failure. NOTE: I said REDUCE not PREVENT

 

[AlienCraft]

Originally posted by: arsbanned

Originally posted by: AlienCraft

Originally posted by: Minerva
Positioning trolley rigs for loading heavy machine parts through repair access openings cutout on the hull of ships. They want to use multiple lines and the rig at the end has a large reach. The service cranes at the drydock are not capable of handling two parts they want.

One crane might do it, however, another similar capacity should probably be used to control any movement. The "event moment" is the most dangerous aspect. This is when the load starts to swing due to pendulum effects. The weight where the crane is concerned will vary and this may cause crane failure.
Also in order to SAFELY carry the load AND move the crane should be rated at at least 3x load weight.
All the loads I've ever installed above people have been engineered at 6x load weight.

Overkill at the install is better than killing anyone at the install. < Allen's Rigging Rule #1.

Re: "event moment" . Aren't you making assumptions about the load, the details of which we have no knowledge of?

Yes, but given that the event moment is always present in a load being carried, it needed to be addressed.
The weight question wasn't answered, although I specifically asked it.

 

[skyking]

Cranes don't pull horizontal loads well. They either lift or break. Are you tugging something on a trolly or truck set, or actually lifting and swinging a load?

until lhe answers that, it is a moot point

What is better three 300 ton cranes or a single 1000 ton crane pulling load across tracks with no perceivable incline?

with that wording, I imagine something more like a monster truck pull

 

[AlienCraft]

Originally posted by: skyking

Cranes don't pull horizontal loads well. They either lift or break. Are you tugging something on a trolly or truck set, or actually lifting and swinging a load?

until he answers that, it is a moot point

What is better three 300 ton cranes or a single 1000 ton crane pulling load across tracks with no perceivable incline?

with that wording, I imagine something more like a monster truck pull

I was thinking of a Tractor Pull when I first read this also.
He did sort of answer it in the description of WHAT the problem is to wit... Loading heavy machine parts into the hold of a ship.
Here in SF at the Hunters Point Navel Shipyard, we have one of the worlds largest cranes designed specifically for loading heavy parts into ships for exactly this purpose. It straddles the ship and can handle huge loads and can truck along the length of the ship as well as trolly from side to side.

 

[skyking]

Ahh, my bad. I missed his added description.


Edit: it looks like he wants a tugger, now that I re-read it all. Don't try to pull the load with a crane at all, get a tugger or winch set.

 

[meltdown75]

rigga what?

 

[Minerva]

Hey guys!

My fiance is a consultant and I'm looking at a proposal. It is very technical at least to me. One of the key parts is a volute (looks like a snail lol) and it has a weight of 24,545 (kg). There are other parts too. The yard is in Germany where this is to be done.

This stuff reminds me of word problems we had in engineering school!