Re: Shore To Ship Hose Connections
Dear James,
To see a sophisticated pneumatic loading tower, go to Google Earth and zoom in on the port of Antwerp
Coordinates:
N 51 15’13.13”
E 4 24’25.62”
One of the pictures shows a pneumatic loading tower (1 of 5) from a cement import/export terminal for cement.
The towers were used for ships up to 45000 dwt.
Pipe size is 10” and the pneumatic 110 tons/hr conveying system was a FK pump screw feeder and an Aerzen screw compressor of approx 75 m3/min at 1.2 bar. (3 pipe systems could work in parallel).
The biggest problem was the slamming of the hoses.
I was also involved in a cement loading project of 40000 dwt ships in the port of Rotterdam, where we used steel pipe on the hatch cover of the ship connected with flexible hoses and bends.
Each line was built up from 3m pipes, bends and flexible hoses for each different loading hole.
The pipes were secured and lashed to the ship or hatch cover against slamming.
Special external de-aerating filter equipment assemblies were connected to the holds, from where the collected dust was re entered into the main flow from time to time.
A flexible hose was hanging from the ship side towards the shore based pipe connection.
One pneumatic loader had a loading boom with steel pipe and flexible hoses and the end was connected to the ship based pipes.
This flexible hose, consisting of 4 lengths, was shortened when the ship’s draft increased.
The whole arrangement was moved to the next loading hole when required by the master.
Here we used double kettle pneumatic conveying installations, where we set the opening pressures of the kettle lower, to prevent excessive surges in the conveying line in order to minimize the slamming of the hoses.
In the port of Rotterdam, we moved the loading arrangement along the ship. (As if the sip itself was moved)
In the port of Antwerp, the ship stayed stationary along the quay and the loading towers were changed to that one, which had the loading hole within reach.
The experience is, to build a piping system with as little as possible flexible hoses and bends for each loading hole. And keep the flexible hoses as straight as possible.
Hanging steel pipes and flexible hoses in a crane will lead to scary situations of slamming equipment and damaged cranes.
It can be done, but requires some man power to do the labor.
Also the amount of fly ash per year is important for how sophisticated the installation should or can be.
The size of the piping is important for the generated forces to handle, but also for the loading rate.
Have a nice day
Teus ■
Teus
Re: Shore To Ship Hose Connections
Dear James,
I forgot to mention a very important aspect of pneumatically loading bulk carriers.
Be very careful with the possibility of building up pressure inside the hold.
That can lead to nasty accidents.
At least take care for a reliable and certain over pressure safety valve and leave the hatches unlocked and unlashed.
Then the cover itself functions as a safety valve, relieving the over pressure with a deep sigh, just by lifting the hatch cover a little bit.
Take care
Teus ■
Teus
Re: Shore To Ship Hose Connections
Hi Teus
Thanks for your experience - the machine at the Port looks quite elaborate = my mind is still ticking over...wish to utilise the existing grain loader if I can to save room and costs.
We are going to use lean phase due to limited head room under converted grain silos for DP tanks. But silos are not close to the wharf - hence, have some limits here with pressures/rates etc.
I was after 300tph thru each line - 450mmNB but now may re visit that given that some ships only have 300mm on deck lines.
Thanks
James ■
Re: Shore To Ship Hose Connections
Hi James,
>
Yes, the loading towers at the port of Antwerp are sophisticated, although the flexible hoses did cause some problems.>
I calculated the possible conveying distances, using your values of 300 tons/hr fly ash through a 18” pipe line.>
The quick and preliminary results are:
The pipe diameter sets the air displacement of the compressor.
I used an Aerzen compressor VM140 at 5500 rpm
Air displacement 2.46 m3/sec # 147.6 m3/min>
340 tons/hr at 250 m at a pressure of 1.4 bar
340 tons/hr at 350 m at a pressure of 1.8 bar
340 tons/hr at 450 m at a pressure of 1.3 bar>
>
The high volume of air requires de-aeration holes in the hatch cover of approx. 16” – 18” with a suction fan of approx. 250 m3/min at sufficient vacuum to cover the pressure drop over the fan and the connection hose between filter unit and hold.>
The loading of the holds requires a trimming device in the hatch cover at centerline ship.
We used a trimming device with a controllable flap, which could be set to port or starboard from the deck. If you like, I can send you a drawing.
The trimming device also incorporated the de-aeration conduit.
The ships we loaded had no holes at all in the hatch cover and therefore we torched them, welded a connection flange and welded the plates back into place later.
For a 10” conveying pipe, we used a 16” connection flange in the hatch cover.>
If you want to use the existing grain unloader (I started my pneumatic conveying career in grain uloaders in the port of Rotterdam), then you could use the filter separators as receiving vessels for the fly ash and the boom(s) as a support for an airslide with a loading bellow at the end.
It solves immediately the air problem in the hold.
Also, the grain unloader can travel along the ship, connect to the main pipeline where necessary and reach all holds of the ship.>
I understand that your project is in the starting phase where all alternatives and ideas are inventoried.
If you wish to communicate for your project outside the forum, send me a private message.>
Have a nice day
Teus ■
Teus
Re: Shore To Ship Hose Connections
Hi James,
Yes, the loading towers at the port of Antwerp are sophisticated, although the flexible hoses did cause some problems.
I calculated the possible conveying distances, using your values of 300 tons/hr fly ash through a 18” pipe line.
The quick and preliminary results are:
The pipe diameter sets the air displacement of the compressor.
I used an Aerzen compressor VM140 at 5500 rpm
Air displacement 2.46 m3/sec # 147.6 m3/min
340 tons/hr at 250 m at a pressure of 1.4 bar
340 tons/hr at 350 m at a pressure of 1.8 bar
340 tons/hr at 450 m at a pressure of 1.3 bar
The high volume of air requires de-aeration holes in the hatch cover of approx. 16” – 18” with a suction fan of approx. 250 m3/min at sufficient vacuum to cover the pressure drop over the fan and the connection hose between filter unit and hold.
The loading of the holds requires a trimming device in the hatch cover at centerline ship.
We used a trimming device with a controllable flap, which could be set to port or starboard from the deck. If you like, I can send you a drawing.
The trimming device also incorporated the de-aeration conduit.
The ships we loaded had no holes at all in the hatch cover and therefore we torched them, welded a connection flange and welded the plates back into place later.
For a 10” conveying pipe, we used a 16” connection flange in the hatch cover.
If you want to use the existing grain unloader (I started my pneumatic conveying career in grain uloaders in the port of Rotterdam), then you could use the filter separators as receiving vessels for the fly ash and the boom(s) as a support for an airslide with a loading bellow at the end.
It solves immediately the air problem in the hold.
Also, the grain unloader can travel along the ship, connect to the main pipeline where necessary and reach all holds of the ship.
I understand that your project is in the starting phase where all alternatives and ideas are inventoried.
If you wish to communicate for your project outside the forum, send me a private message.
Have a nice day
Teus ■
Teus
Shore to Ship Hose Connections
Hi All,
I am running a project to load ships with fly ash via lean phase technology. The wharf is a multi user and has a conveyor gallery etc on it. I am trying to work out the best way to connect between the shore and ship. I am dealing with a vertical height range os 10m. I have seen the inverted U hose arrangment - it is a bit elaborate and requires hardware and room - not going to be too viable . I have also seen a broken W arrangement - combination of hoses and bent rigid steel pipe - do not think that this wil give me 10m range.
I am considering a simpl;e radial arm arrangement - hose and rigid and hose that rotates around the shore side hose....it is simple......has less hose to deal with. The only issue is how to handle the laterla movement required as the loading arm moves angularly to load the ship over 10m. I am thinking of duplicating the same in the offset direction to give me this movement (also deal with pipe expansion)...the alternative to this is a long in line - pipe to pipe expansion joint or compensator.
Whilst not lockeed into the above concept, I am seeking any comments, thoughts or suggestions on what has been used with success to gain the required functionality.
Cheers...James
Rough sketch of idea is attached
Attachments
ap wharf looking east 23042010(012) (JPG)
sketch jm idea for shiploading hose connection 201 (PDF)
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