Controlled discharge of ( noxious) tank washing at sea - chemical tanker guideline
First and foremost the cargo tanks and piping shall be discharged as completely as possible, taking into account:
a) Ship to have beneficial trim and list to assist final stripping
b) Cargo to have correct temperature for easy flow to pump suctious.
c) Adjoining tank walls (=cargoes) as far as possible to have a temperature which reduces noxious cargo under discharge to cling to the walls.
d) Possibilities to drain the piping system by blowing ashore with air or inert gas or use stripping line of small diameter ashore.
Studies and calculations have been made for many individual ships and products to demonstrate that the amount of cargo remains from the various tanks, using above procedures and other particular methods, will not exceed the “permissible amounts for B and C" (1 m *3 or 1/3000 arid 3 m *3 or 1/1000 of tank volume).
Similarly, pumping procedures for overboard discharge (pumping speed and discharge pipe arrangement) have been established for many vessels in order to fullfill requirements of dilution in the ship's wake. In some ships special "mixing tanks'' are provided. By means of mixing pumps cargo remains are diluted with seawater to permissible concentrations.
a) Ship to have beneficial trim and list to assist final stripping
b) Cargo to have correct temperature for easy flow to pump suctious.
c) Adjoining tank walls (=cargoes) as far as possible to have a temperature which reduces noxious cargo under discharge to cling to the walls.
d) Possibilities to drain the piping system by blowing ashore with air or inert gas or use stripping line of small diameter ashore.
Studies and calculations have been made for many individual ships and products to demonstrate that the amount of cargo remains from the various tanks, using above procedures and other particular methods, will not exceed the “permissible amounts for B and C" (1 m *3 or 1/3000 arid 3 m *3 or 1/1000 of tank volume).
Similarly, pumping procedures for overboard discharge (pumping speed and discharge pipe arrangement) have been established for many vessels in order to fullfill requirements of dilution in the ship's wake. In some ships special "mixing tanks'' are provided. By means of mixing pumps cargo remains are diluted with seawater to permissible concentrations.
It should be borne in mind that individual ship has got own characteristics and limitations may involved handling various chemical cargoes .
The master and all personnel in all cases must be aware of cargo/ship information that has been given and comply with relevant safety procedures.
Related Info
Defining three main categories of noxious liquid chemicals at sea
Cargo handling equipments for handling noxious liquid substances in bulk
Cargo handling safe practices onboard modern chemical tankers
Product information required for various chemical cargo prior loading
IMO codes guideline for modern chemical tankers
Controlling the atmosphere in cargo tanks with nitrogen supplied from shore
How to determine the level of a liquid in a chemical tank
Poisoning and required first aid treatment onboard
After tank cleaning gas freeing safety guideline for chemical tankers
Draegar safety tube prior entering enclosed spaces
Preparations prior allowing personnel into cargo tanks / enclosed spaces
How to rescue injured or unconscious person from enclosed spaces
Preparations for hot work and safety precautions
Total flooding method for seagoing chemical tankers
Water extinguishing method for fire protection
Foam extinguishing method for chemical tankers
Dry powder fire extinguishing method
Tank cleaning fatality- case study & lessons learned
Tank cleaning and poisoning hazards
Testing of tanks and cargoes
Practical tank cleaning methods for various noxious liquid cargo
Special tank cleaning method
Determining proper tank cleaning by acid wash method
Supervision of all tank cleaning and gas freeing operations
Disposal of tank washings, slops and dirty ballast - safe method
Following reference publications provide useful guidance and international regulations for carrying hazardous chemicals at sea.
More info:
Home page ||| Chemical hazards ||| Cargo planning & Stowage ||| Cargo loading ||| Cargo documents ||| Safe stability ||| Cargo care ||| Preparation for unloading ||| Inert gas systems |||Gas freeing ||| Nitrogen handling ||| Chemical handling Safe practice |||Handling equipments ||| Cargo & Ballast pumps ||| Cargo tanks |||Tank cleaning |||Special cargoes |||Spills emergencies |||Fire protection
Chemicaltankerguide.com is merely an informational site about various aspects of chemical tankers and safety tips that may be particular value to those working in: Chemical Handling, Chemical Storage, Liquefied Chemical Suppliers, Chemical Shipping, Chemical Transportation, Chemical Terminals, Bulk Chemical Services and Chemical Processing. If you are interested in finding out more about chemical tanker guideline please visit IMO official website. For any comment please Contact us
Copyright © 2011 Chemical Tanker Guide.com All rights reserved.
Related Info
Defining three main categories of noxious liquid chemicals at sea
Cargo handling equipments for handling noxious liquid substances in bulk
Cargo handling safe practices onboard modern chemical tankers
Product information required for various chemical cargo prior loading
IMO codes guideline for modern chemical tankers
Controlling the atmosphere in cargo tanks with nitrogen supplied from shore
How to determine the level of a liquid in a chemical tank
Poisoning and required first aid treatment onboard
After tank cleaning gas freeing safety guideline for chemical tankers
Draegar safety tube prior entering enclosed spaces
Preparations prior allowing personnel into cargo tanks / enclosed spaces
How to rescue injured or unconscious person from enclosed spaces
Preparations for hot work and safety precautions
Total flooding method for seagoing chemical tankers
Water extinguishing method for fire protection
Foam extinguishing method for chemical tankers
Dry powder fire extinguishing method
Tank cleaning fatality- case study & lessons learned
Tank cleaning and poisoning hazards
Testing of tanks and cargoes
Practical tank cleaning methods for various noxious liquid cargo
Special tank cleaning method
Determining proper tank cleaning by acid wash method
Supervision of all tank cleaning and gas freeing operations
Disposal of tank washings, slops and dirty ballast - safe method
Following reference publications provide useful guidance and international regulations for carrying hazardous chemicals at sea.
- SOLAS (latest consolidated edition)
- MARPOL – 73/78 (latest consolidated edition)
- BCH / IBC Code
- International Safety Guide for Oil Tankers and Terminals (ISGOTT)
- Tanker Safety Guide (Chemicals)
- Ship to Ship Transfer Guide (Petroleum)
- Safety in Oil Tankers
- Safety in Chemical Tankers
- IMDG Code
- Supplement to IMDG Code (Including MFAG and Ems)
- SOPEP
- Clean Seas Guide for Oil Tankers
- FOSFA (for Oils, Seeds and Fats)
- Prevention of Oil Spillage through Cargo Pumproom Sea Valves
- CHRIS Guide (USCG)
- Chemical Data Guide for Bulk Shipment by Water (Condensed Chris)
- MSDS for particular cargo carried
- Chemical Tank Cleaning Guide
More info:
- Loading / stress computer for chemical tankers
- Chemical handling suitable equipments for operational personnel onboard
- Safety equipments - Ventilation in cargo handling spaces
- PV valves -function and maintenance requirements
Home page ||| Chemical hazards ||| Cargo planning & Stowage ||| Cargo loading ||| Cargo documents ||| Safe stability ||| Cargo care ||| Preparation for unloading ||| Inert gas systems |||Gas freeing ||| Nitrogen handling ||| Chemical handling Safe practice |||Handling equipments ||| Cargo & Ballast pumps ||| Cargo tanks |||Tank cleaning |||Special cargoes |||Spills emergencies |||Fire protection
Chemicaltankerguide.com is merely an informational site about various aspects of chemical tankers and safety tips that may be particular value to those working in: Chemical Handling, Chemical Storage, Liquefied Chemical Suppliers, Chemical Shipping, Chemical Transportation, Chemical Terminals, Bulk Chemical Services and Chemical Processing. If you are interested in finding out more about chemical tanker guideline please visit IMO official website. For any comment please Contact us
Copyright © 2011 Chemical Tanker Guide.com All rights reserved.