Evaporator factory purchases wire mesh demister pad
The wire mesh demister in evaporator prevents carryover of valuable
products, can be appropriately used for boiler feed water or
processes, and produces high quality condensate.
Wire Mesh Demister Materials :
3.1Metallic Mesh Pads
Materials for metallic Mist Eliminators are as per customer need.
Type 304 or Type 316 mesh pads can be in accordance with ASTM
A-478. Monel mesh pads can be in accordance with ASTM B-164.
3.2Non-metallic Mist Eliminators
Non-metallic Mist Eliminators shall be PTFE or polypropylene as
specified in by customer.
3.3Supports
A.Supports welded to the vessel shall be the same material as the
shell. Where the shell is lined, supports welded to the lining
shall be the same material as the lining.
B.Supports not welded to the shell (e.g. beams) shall be the same
material as the Mist Eliminator.
3.4Grids
A.Metallic grids can be the same material as the mesh pad
B.For non-metallic mesh pads, the grids shall be carbon steel,
coated with the same material as the mesh pad.
3.5Fastening Devices
A.For metallic mesh pads the wire ties or other fastening devices
shall be of the same material as the Mist Eliminator.For
non-metallic mesh pads, the grids shall be carbon steel, coated
with the same material as the mesh pad.
B.For non-metallic mesh pads the wire ties can be the same material
as the mesh pad.
Metal Wire Mesh Pad Demister Type and Applications
Wire Dia. mm | Mesh Density Kg/m3 | Surface Area M2/m3 | Normal Micron Rating | Application |
| 0.15 | 195 | 650 | 3 | Very high efficiency in clean service |
| 0.15 | 145 | 480 | 4 | Fine droplet removal in clean service |
| 0.15 | 112 | 375 | 5 | General purpose in clean service |
| 0.28 | 195 | 355 | 5 | Optimum efficiency & pressure drop |
| 0.28 | 170 | 310 | 6 | General purpose not totally clean |
| 0.28 | 145 | 265 | 8 | Heavy Duty e.g. Oil & Gas Separators |
| 0.28 | 110 | 200 | 10 | Light fouling |
| 0.28 | 80 | 145 | 12 | Moderate fouling |
Working Theory of Wire Mesh Demister
Demister pads or Mist eliminators are porous blankets of metal or
plastic knitted wire mesh, designed and constructed for the
efficient, economical removal of entrained liquid droplets from
vapor streams. Demister Pads can be fabricated in any required size
and shape and may be installed in new or existing process vessels.
HOW IT WORKS
When vapor and entrained liquid droplets pass through a mist
eliminator, the vapor moves freely through the mesh pad but the
liquid droplets, due to their greater inertia, cannot make the
necessary sharp turns and as a result are thrown into contact with
the wire surfaces and briefly held there. As more droplets enter
the pad and collect on the wires, they grow in size, run down the
wire to the bottom surface of the mesh separator and fall from the
unit. Overhead vapor is now free of entrained liquid.
Wire Mesh Demister Delivery:
