Chemical Tankers / Day 4 / Day 4 Topic 5 Cargo Contamination (sources & precautions)

Chemical Training

Cargo contamination – Sources & Precautions

Sub Topics

5.1 Common sources of cargo contaminations.

5.2 Precautions against cargo contamination

Sources of Cargo Contamination:

What are the Common sources of cargo contamination?

Discuss

Sources of Cargo Contamination:

Common sources of cargo contamination include:

Water

Sampling

Foreign Matter

Previous Cargo

Hydraulic Oil

Tank Cracks

Atmospheric sources

Heat

Sources of Cargo Contamination:

Sources of Water:

Residue from Tank Cleaning (Poor Inspection Procedures)

Condensation

(Poor quality air/N2 or failure to maintain tank below dew point)

Heating Coil Leakage

(Failure to test or poor test procedures)

Sources of Cargo Contamination:

Sea water Ingress:

–Battening Down Procedure

–Packing Inspection

–Cracks from deck

Rain Water Ingress:

–Checking / Draining of Vent Risers

–Avoid open sampling during rain

Sources of Cargo Contamination:

Heat damage:

Excessive Heat Adjacent

–Temperature Monitoring

–Discharge Rotation

Direct Overheating (Scorching)

–Discoloration

–Temperature Monitoring

Sources of Cargo Contamination:

Foreign Matter:

From shore tanks / shore lines / barges (Sediments, residual last cargoes)

Pig material

(Sampling / P&I / Log Entries for claims)

Cleaning Rag Fibres

(Incorrect mopping method and poor tank inspection procedures)

Sources of Cargo Contamination:

Previous Cargo:

Poor and inadequate cleaning prior loading

(Lines / Drain Cocks / Tank / Vent Lines) (Poor tank Inspection Procedures)

Poor Coating

(poor inspection,tank condition rating incorrect)

(Lack of hand cleaning)

(Residues from behind blisters/ Delamination)