Vessel demisters are devices primarily used in high-pressure gas vessels and towers in power plants, chemical plants, refineries, and various other industrial processes. Vessel demister pads are an integral part of any process vessel, storage tank, and reactor system. Their unique design enables them to capture and contain the entrained droplets in the vapor stream and reduce contaminated vapors for clean air release.
Material
The material used in vessel demisters is typically constructed of wire mesh, polymers, metal, elements. Commonly used materials include polypropylene, polyethylene, stainless steel, zinc-plated steel, brass, and PVC. These materials can be selected based on their chemical, temperature, and corrosion resistance capabilities.
Sizes and Shapes
Vessel demister pads come in a wide range of sizes and configurations, including round pads, wedge wire pads, and various other shapes. The size and shape of a vessel demister usually depend on the size and shape of the equipment it will be installed in. Generally, the demisters are designed to fit within the vessel or tower that they are intended for. The length and width of a vessel demister depend on the size and configuration of the job.
Application
Vessel demisters are used to ensure the efficient removal of liquid droplets from gas streams. Also, they reduce the risk of explosions and fires due to flammable liquid buildup, control dust and fines in the air stream, and prevent corrosion of downstream equipment.
Data Sheet for Vessel Demisters
Vessel Informstion | |||||
Vessel Designation | Individual Knok-out Drum | ||||
Vessel Number | KOD-2001 & 2003 | ||||
Configuration | Vertical | ||||
Design Pressure | bara | 12 | |||
Design Temparature (min/max) | °C | - 20 / 70 | |||
Material | Internal Coating | ASTM A-516 Gr.60 | Epoxy Coating | ||||
Internal Diameter | mm | 610 | |||
Heigth (T/T) | mm | 2286 | |||
Corr. Allowance | mm | 3 | |||
Gas Outlet Nozzle | mm (in) | 101.6 (4) | |||
Desimeter Information | |||||
Quantity | 02 | ||||
Material of Construction | POLYPROPYLENE | ||||
Maximum Allowable Pressure Drop | bar (psi) | 0.069 (1) | |||
Application | Gas Outlet Desimeter | ||||
Desimeter Size | mm | 610 DIA. | |||
Desimeter Thickness | mm | VTA | |||
Free Volume | m3 | VTA | |||
Wire Thickness | mm | VTA | |||
Wire Surface Area | m3 / m3 | VTA | |||
Desimeter Orientation | Horizontal | ||||
Liquid droplet size to be removed from Gas stream | Micron | > 6 | |||
Max. Liquid quality carry over | (Gal / MMSCFD) | 0.1 | |||
Operating Conditions | |||||
Operating Pressure | bara | 4.344 | |||
Operating Temperature | °C | 30 | |||
Gas | Flowrate | (Standard ) | m3/hr | 976.7 | ( Note -1 ) |
(Actual) | m3/hr | 222.9 | |||
density | kg / m3 | 8.006 | |||
viscosity | cP | 0.0094 | |||
M.W. | 43.29 | ||||
Oil | Flowrate | m3/hr | 0.7801 ( Note -1 ) | ||
density | kg / m3 | 576.6 | |||
viscosity | cP | 0.1744 | |||
Water | Flowrate | m3/hr | Nil | ||
density | kg / m3 | - | |||
viscosity | cP | - | |||
Sand | flowrate | m3/hr | Nil ( Note - 2 ) | ||
size range | Micron | - | |||
Notes | |||||
VTA - Vendor to Advise | |||||
1. Vendor to consider 10% design margin in flowrate. | |||||
2. Vendor to consider some traces of sand/dust particles for sizing demister. |
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