Re: Settling Time Required For Cement !
Mark
I have never heard of this but can understand it.
We load up to 20,000T of cement and also up to 9,000T of fly ash per ship.
The cargo is loaded via belt conveyors into several holds at rates up to 1000tph.
Time is lost during loading trimming and changing holds acc.
But at the end, after the final trimming - which takes some time - pkus the final draft survey, the ships leave as long as the tide is OK otherwise they have to wait.
The Captain/Master has the first and final say over the loading process and aslo the decision to leave.
I suggest that U need to talk to them and their owners.
Cheers
James ■
Settling Time Required For Shiploading Cement
IF THE CEMENT IS BEING LOADED IN THE BARGES/HOLDS PNUEMATICALLY THEN THE CEMENT NEEDS MORE TIME TO SETTLE DOWN AS COMPARE TO OTHER METHOD SAY BY BULK HEAD ETC.
THE TIME OF SETTLING OF CEMENT CAN BE REDUCED DOWN BY PROVIDING VIBRATING RODS IN A PROPER WAY AND THEY, GET ACTIVATED WHEN THE CEMENT IS BEING LOADES IN THAT HATCH.BY DOING THIS WE CAN EVEN INCREASE THE CARRYING CAPACITY OF BARGE.
ANIL ■
Re: Settling Time Required For Cement !
Quoting from Thomas' Stowage, Third Edition : "When pumped into vessel through hoses, cement flows like a liquid whilst in motion, and it is important that the ship remains upright at all times. On completion cargo should be reasonabely level. A period of time should be allowed for the cement to settle and any air to escape. Once settled cement is not liable to shift and shifting boards, or bagging, is not considered necessary." This doesn't tell you how long a period of time.
From pracatical experience on our own 7,000 dwt bulk barge which recently loaded bulk cement ex Bandar Khomeini, Iran. After completion of loading into the 3 holds via cement holes, the barge waited at berth for 3 hours, then proceeded by tow via the protected port channel for 9 hours to the sea pilot station. This was deemed sufficient time for the cargo to be settled for the sea voyage to Kuwait.
Best Regards
Kassim ■
Settling Time Required For Shiploading Cement
dear kassim, thanks for your very important and practical information.
regards, anil seth ■
Settling time required for cement !
We are loading cement on a regular basis in a very small port (Nice, France) which especially during summer time is congested with passenger/cruise vessels and the port authorities are pressing for the cargo ships to leave as quickly as possible after loading which seems normal.
A continous fight is going on when vessels loading cement want's to wait for the cargo to settle before sailing (4, 8, 12 hour after completion).
Can anyone help with official texts (IMO, SOLAS or other) stating or showing how to calculate the time needed for setteling the cement and/or the time a vessel may ask to stay in the port after completion ?
We do have an anchorage point a couple of miles from the port but often not enough sheltered.
Thanks in advance.
Mark
Additional info : We have dustfree loading by hose and connected an airexhaust filter. We have more or less no equipement in our small port. No vibration rods available. ■