Grabs
Dear Mr. uditha,
there's no drwg attachment to your post. However, due to grab technology there's quite always a dust issue with certain bulks. At the unloading of the grab into the bunker, there might be installed an industrial dust suppression system, based on air intake or moisture fog principles. During the grabs travel, it is up to the correctly closed and not overly charged grab to contain. But if the bulk contains a a lot of dust, it will quite always sort of blow away from the upside of the grab. Then there's the scooping within the ship, but there i have not seen a global technical solution, only a slowdown & a sure hand of the driver might help a bit.
Perhaps other could add something?!
So, you might be wanting to install continuous unloading technology, but there you only have to ask and someone will rush to it...
Regards
R. ■
Gripping Solution.
What you, and grab unloading in general, need to realise is that the dust generation is increasing with the distance travelled. Eliminate the distance the grab travels over the hatches so that all the dust generation is within the holds and you're there. Such a design was completed during 2007/8 but it isn't for free. ■
John Gateleyjohngateley@hotmail.comwww.the-credible-bulk.com
Re: Clinker Unloading
there's no drwg attachment to your post. However, due to grab technology there's quite always a dust issue with certain bulks. At the unloading of the grab into the bunker, there might be installed an industrial dust suppression system, based on air intake or moisture fog principles. During the grabs travel, it is up to the correctly closed and not overly charged grab to contain. But if the bulk contains a a lot of dust, it will quite always sort of blow away from the upside of the grab. Then there's the scooping within the ship, but there i have not seen a global technical solution, only a slowdown & a sure hand of the driver might help a bit.
Perhaps other could add something?!
So, you might be wanting to install continuous unloading technology, but there you only have to ask and someone will rush to it...
Regards
R.
Thanks Mr. Roland,
we are have planining to two option
option 1
improvement of existing system
1.we improve closing machanism of grabs (rubber flange for closing flange)
2. Dust extraction for hopper (hopper boundry we fixed to 4 slot hoods , dust collector and canaopyies can possible to separate
Option 2
screw type continous unloading mechanism
thanks
uditha ■
Re: Clinker Unloading
thanks Mr. John
can you send consulting fee and yours profile to my email
uditha@sigmaetchnologies.lk
thanks
Uditha ■
Costing
can you send consulting fee and yours profile to my email
uditha@sigmaetchnologies.lk
thanks
Uditha
Hi
any one have a experience of what is the cost of continous screw unloading system
port deck size is around 150 M. normally 5 vessels is locate to deck
daily rate is 6000~7000 tones per hour
Regards
uditha ■
Untitled
There were a couple of screw unloaders for sale on the forums recently so you could ask thereabouts.
What life are you expecting from the rubber faced grabs? ■
John Gateleyjohngateley@hotmail.comwww.the-credible-bulk.com
Rubber Flange
Hi Mr.John,
may be one year for hard rubber?
I interesting to see all threads in screw unloaders
thanks
uditha ■
The Answer Is Blowing In The Wind.(Bob Dylan)
Hello Uditha,
I was away in Java and Cambodia and missed your RFQ message. Now I am back in England and renewing my interest in grab unloading and container loading and unloading.
As Roland mentioned a drawing is essential if you wish to take the issue further.
Please send drawing pdf's suitably camouflaged for confidence to johngateley@hotmail.com so that I can gauge the suitability of my modification and perhaps give a budget price.
A berth of 150m will not accommodate, comfortably, Handymax or Panamax and I am confused about 5 small vessels reaching a daily output of 6000t.
It seems that your customer doesn't want to fork out on screw unloaders and so you still have the grabs throwing dust about in the shore winds. Did you get 12 months out of the rubber tipped grabs?
On the other threads referred to, it is clear that some people don't recognise that ships cannot be unloaded with a loading spout whether or not the material casts a shadow in bright sunlight. I'm just curious there. Most of the other replies offer to drown cement clinker with water regardless and the rest make very ambitious claims that they can remove dust from the ships hold: as if. Dust generated in the holds is quite sheltered and there is no need to remove it. Control and containment are adequate providing the wind doesn't get down to the hold floor, which it hardly ever does. ■
John Gateleyjohngateley@hotmail.comwww.the-credible-bulk.com
Re: Clinker Unloading
dear Mr. John ,
thanks for reply , actually client mentioned rate is 12,000 tons per day (24 hrs)
continuous unloading mechanism is difficult , due to government decision .
I see some eco hoppers , is possible to design automatic closing doors for unloading stage of grabs?
do you design this type of projects?
regards
uditha ■
Clinker Abrasiveness
Dear Uditha,
Have you considered that clinker is abrasive material and you may have high wear with screw unloader. ■
Done And Dustless.
Hi Uditha,
You are coming round to fitting an airlock when you mention closing doors.
It is possible to design an airlock which will practically eliminate fugitive dust from the wharf.
This would cost much less than any screw unloader and be more reliable. Please let me have a drawing or sketch of the existing equipment and I can probably give you a costing very quickly.
I am intrigued by the government decision to hinder continuous unloading but also appreciate that decision.
An eco hopper without an airlock is like an Englishman without an umbrella! ■
John Gateleyjohngateley@hotmail.comwww.the-credible-bulk.com
Clinker Unloading
Dear Mr. Uditha:
I don't see attached drawing. Where it can be found?
Re
Charlie
this is clinker unloading issue for dust suppression. we use Grabs for unloading clinker. high dust suppression occured in fallowing operations.
- Scooping Grabs (Loading)
- traveling to ship to hopper (lekages of grabs)
- Discharging grabs
please refer attached drawing. we need to proper unloading system or dedusting system this operation.
Thanks
■
Clinker Unloading
Dear All,
this is clinker unloading issue for dust suppression. we use Grabs for unloading clinker. high dust suppression occured in fallowing operations.
please refer attached drawing. we need to proper unloading system or dedusting system this operation.
Thanks ■