Table of Contents
What is the function of knock out drum?
A knockout drum is used to remove any oil or water from the relieved gases. Vapour travels upward at a designed velocity which minimizes the entrainment of any liquid droplets as it exits the top of the vessel.
What is a knock out vessel?
The Knock out drum is a vessel in the flare header designed to remove & accumulate condensed & entrained liquids from the relief gases. Both the horizontal & vertical design is a common consideration for the Knock out drum, which is determined based on the operating parameters as well as other plant conditions.
What is a knockout drum in refinery?
A Knock-out (KO) drum consists of a vertical vessel specially designed to separate vapor and liquid from a two-phase process flow. Inside you’ll find an inlet diffuser and de-entrainment mesh pad designed to maximize the collection of liquid contained in the vapor as it travels to the top of the vessel.
What is the purpose of a surge tank?
Surge tanks are used to measure liquid flow rate and the combined shrinkage and meter factor. They are also used as a second stage separator, and hold a constant back-pressure by using an automatic pressure control valve on the gas outlet. Surge tanks are also used for storage.
What is closed blowdown?
Blowdown is through a pipe connected to the vapour space of the vessel. A normally closed actuated blowdown valve (BDV) opens and allows vapour to pass from the vessel to relief system or blowdown stack. BDVs are configured to open in the event of a failure of the control or actuation system.
Why is a surge vessel needed?
Surge vessels are important assets in the water treatment process, though incorrect maintenance and management can lead to issues in the supply of drinking water. The main purpose of the surge vessel is to maintain the correct pressure whilst water is transmitted to the mains networks.
What is blowdown drum?
A separate collection vessel intended to receive a periodic or emergency discharge of liquids, liquid reaction mass, or slurries from a number of process vessels, reactors, or equipment items.
What is inside of surge tank?
Surge tanks that are visible or above ground are usually made of steel or concretes. The amount of water that can be stored inside the surge tank is known as surge capacity of the tank.
How do saddle tanks work?
Almost all modern saddle-style tanks use a returnless fuel system that regulates the pressure to the fuel rail inside the tank. Older systems with a return line may use a suction jet that uses a venturi effect created by the returning fuel to suck fuel into the primary fuel well.
What happens if you don’t have a knock out drum?
Without a Knock-Out drum, liquid hydrocarbons will carry over to and burn on the flare tip. Since liquids burn hotter than the gases and since they burn directly on the metal, the metal degrades extremely quickly. A flare with liquid carryover can burn up in a matter of months.
What is a knockout drum on a flare?
All flare, vent, and relief systems must include a liquid knockout drum. The knockout drum removes any liquid droplets that carry over with the gas relief sent to the flare. Most flares require the particle size be reduced to a minimum of less than 300 μm.
What is another name for a knock out drum?
This process equipment is also known as the flash drum, knockout pot, KO drum, knock-out vessel, or flare KO drum. A knock-out drum is one of the primary components in a pressure-relief arrangement system in process industries.
What is the function of knockout drum in chemical industry?
The main function of a knockout drum is to provide residence time for liquid discharges and to limit the size of droplets directed to the liquid seal drum or the flare burner. They are used to remove any liquid droplets of oil or water from the industry relieved/flare gases.