Just great place for everyone

What is refinery slop tank?

What is refinery slop tank?

Slop tank means a tank specifically designated for the collection of tank drainings, tank washings and other oily mixtures.

What is the purpose of slop tank?

Slop tanks are the focal point of the Load-On-Top system used on crude oil tankers to prevent pollution of the sea. Design of these tanks and their operating procedures strongly affect the degree of oil-water separation achieved.

What is refinery slop oil?

“Slop Oil”, by definition, is considered crude oil which is emulsified with water and solids rendering it a waste stream that cannot be sold down the pipeline. Slop Oil, or secondary oil, is found in evaporation ponds, sludge pits, storage tanks, and permitted commercial disposal facilities.

What are the requirements of slop tanks?

The slop tanks capacity are to be 3% of the total oil carrying capacity of the vessel. It may be reduced to 2% of the tank washing arrangements are such that once the tanks are charged the water is sufficient for washing and to provided drive for educators, 2% where CBT and SBT are provided.

What is slop in oil and gas?

Slop oil (also called rag layer) is termed as a mixture of oil, water and fine solids [1], which can be frequently found throughout the processes of oil production in oil and gas industry, e.g., exploration, production, and refining processes. Various types of slop oils are produced from different oil fields.

What is slop system?

A slop oil recovery system is a method and the equipment used for cleaning and disposing of mixtures of oil, chemicals, and water from various sources in a refinery or oilfield.

What is sludge tank?

Sludge tank – A tank provided to receive oily residues coming from the oily water filtering or separating equipment and from the purification of fuel and lubricating oils.

Why is it called Cascade tank?

The term cascade is often used because the dirty condensate is filtered through cascading method in different chambers.

What is slop pump?

Slop Oil and Sludge Oil is reclaimed petroleum waste mixtures of oil, chemicals and water derived from a wide variety of processes in refineries or oil fields.

What are slops in Marpol?

Slops and sludges are a hydrocarbon-rich industrial waste, produced in various parts of a ship’s operations, including tank cleaning, purifying fuels and use of ballast water.

How many tanks need to be crude oil washed?

Crude oil washing was made mandatory under MARPOL Annex 1 regulation 13 which states that every crude oil tanker which is 20000 dwt and above must be fitted with COW system for every cargo hold tank.

What is sludge in a tank?


Sludge itself is defined as a mixture of liquid and solid materials that have been removed from the treatment system. Essentially, it is the waste of the wastewater treatment process. Sludge is comprised of both inorganic and organic matter.

What is a settling tank?

sedimentation tank, also called settling tank or clarifier, component of a modern system of water supply or wastewater treatment. A sedimentation tank allows suspended particles to settle out of water or wastewater as it flows slowly through the tank, thereby providing some degree of purification.

How many types of sludge are there?

In the present paper an alternative approach has been followed. A mathematical model was proposed and identified on a set of six different types of sludge (primary, secondary and mixed sludge from both urban and industrial WWTP).

What is a condensate tank?

Condensate tanks are part of a condensate return system, and are used to store all the condensate water returned from a steam system. They are typically located near the boiler and their size is determined by the steam load on a system.

What is a scavenge drain tank?

The scavenge air box drain tank is used to collect cylinder oil relict, product of combustion, leaky system oil for scavenge air box, After oil gas separation and rubbish precipitated, the dirty oil is lightered to the residual oil tank by residue oil pump.

What are the Sopep materials?

List of SOPEP Equipments.

  • OS dispersant.
  • Sawdust.
  • Rags.
  • Absorbent pads.
  • Oil kit bags.
  • Scoops.
  • Shovel.
  • Brooms & brushes.

Which vessels does annex 5 apply to?

Unless expressly provided otherwise, Annex V applies to all ships, which means all ships of any type whatsoever operating in the marine environment, from merchant ships to fixed or floating platforms to non-commercial ships like pleasure crafts and yachts.

Is Crude Oil Washing mandatory?

Crude oil washing was made mandatory for new tankers by the 1978 Protocol to the MARPOL Convention. Regulation 33 of MARPOL Annex I requires every new crude oil tanker of 20,000 tons deadweight and above to be fitted with a cargo tank cleaning system using crude oil washing.

What stage of tank washing should you start with?

The tank is first discharged completely or almost completely and washing is started. No build up of liquid level in the tank is allowed and the tank should be continuously stripped during the washing. If the stripping is not efficient – the sludge and sediments may remain at the bottom.

How do you treat sludge?

Thickening is usually the first step in sludge treatment because it is impractical to handle thin sludge, a slurry of solids suspended in water. Thickening is usually accomplished in a tank called a gravity thickener. A thickener can reduce the total volume of sludge to less than half the original volume.

What is a loading tank?

In a loading tank, coagulants like lime and alum are added to the water, which causes suspended particulates to clump together that allows the sedimentation of the suspended particles. Suggest Corrections.

How sludge is removed?

Many sludges are treated using a variety of digestion techniques, the purpose of which is to reduce the amount of organic matter and the number of disease-causing microorganisms present in the solids. The most common treatment options include anaerobic digestion, aerobic digestion, and composting.

Is sludge solid or liquid?

In the wastewater industry, sludge is a solid and liquid hybrid. It can be a semi-solid slurry, a solid from a wastewater treatment plant, or a settled slurry from drinking water treatment. Semi-solids such as sludge are generally treated as solid waste at treatment facilities.

What is a DA tank?

What are Deaerator Tanks : The Deaerator tank in boiler acts as a Feed Water Tank to store cold and hot fluid in order to remove dissolved air or non-condensable gases from the fluid. Deaerating feed tank helps in removing non-condensable gases from a feed.