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. ■

Originally Posted by udithausk

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

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? ■

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. ■

Dear Uditha,

Have you considered that clinker is abrasive material and you may have high wear with screw unloader. ■

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! ■

Dear Mr. Uditha:

I don't see attached drawing. Where it can be found?

Re

Charlie

Originally Posted by udithausk

Dear All,

this is clinker unloading issue for dust suppression. we use Grabs for unloading clinker. high dust suppression occured in fallowing operations.

1. Scooping Grabs (Loading)
2. traveling to ship to hopper (lekages of grabs)
3. Discharging grabs

please refer attached drawing. we need to proper unloading system or dedusting system this operation.

Thanks

■