Gas filter technology

[MortenA]

Im to begin with a small study involving gas filter technology for pipelinnes.

Im familiar with cyclone filters and cartridge filters - are there any other technologies that i might look into?

I know of PALL as a suitable vendor - any other obvious compnies?

Best regards

Morten

 

[25362]

For gas-solid separations, and depending on particle diameter and concentration: High Voltage Precipitation, Wet scrubbers, Venturi scrubbers, Low Voltage Precipitaiton, Bag filtration (machanically shaken, reverse jet of air, blow ring), Wet Cyclones, Packed Tower Crossflow. May be I forgot some, .

 

[quark]

What type of gas, what particle sizes and what is the application? When you say Pall, I presume they are common industrial gases viz., N2, O2 and Compressed Air etc.

Other manufacturers for cartridge filters are Millipore, Sartorius, Parker, Domnick Hunter etc.

The comparision between a cyclone and cartridge is not proper, for cyclone efficiency is very low with reducing particle size.

Regards,

 

[MortenA]

maybe i should have been more specific:

Its dry natural gas from a offshore pipeline (very low HC and water dew point below -10ºC (HC below -30)).

At the receiving terminal there should be filters to remove unexpected liquids or solids.

Best regards

Morten

 

[25362]

You are looking for a trap to catch unknown and unexpected quantities of liquids and solids from a normally clean/dry gas. I think that a site as the following, and those linked to it, may serve, at least, as a tutorial:

http://www.nciweb.net/coalesci.htm

Good luck.

 

[quark]

We have been using Domnick Hunter filters to take care of particulate matter, unexpected oil mist and water for compressed air and Nitrogen. The 0.01 micron filters are capable of removing liquids upto 0.01mg/cu.m and they have better filters too (upto 0.001 mg/cu.m). The filters come along with auto trap which opens up when the liquid level in the filter housing rises.

You can visit the webpage at

http://www.domnickhunter.com

I think you should go for a cyclone-cartridge filter combination.

Regards,

 

[Samiran]

You may want to consider coalescers as the gas will be having some solids too. PECO filters has been a good experience with me.

Samiran

 

[rmw]

Also check out Hilco filters from the Hilliard coropration of Elmira, NY USA.

rmw

 

[aspearin1]

I've had good experience with CUNO filters, at least in my systems. As suppliers, they should be comparable to Pall, Millipore and Sartorius. Possibly cheaper, too.

aspearin1

 

[1969grad]

For a gas transmission pipeline the filter will be much bigger than some of the manufactures listed above can make.

Here is a partial bidders list of typical manufacturers:

Perry Equipment Corp. (PECO)
Burgess Manning
Peerless
King Tool
Winston (sometimes)

Each of the above manufacturers makes different types of separators so you can get a start on understanding your options. Your choice depends on whether you will receive mostly liquids or gas or a combination.

For the HC and water dewpoints listed above your problem is primarily removing solids such as mill slag, weld beads, dirt remaining from construction, etc. Most likely the only time the filter would see liquids is if there was an upset on the platform. So as long as there is not a slug then the filter-sep can handle it.

FYI, cyclone separators are sometimes used depending on the type of equipment downstream and the contaminent. Although the trend presently is toward filter-separators the cyclone has be used extensively at the inlet to compressor stations and meter stations with success. The cyclone will not remove as fine a particle as the filter but it is less maintenance and generally operates with a smaller differential pressure (higher pressure loss = additional HP = more fuel = more $$$$$).

Cyclone separators will generally remove particle sizes 8-10 microns and above. Read a recent study where a gas transmission company measured the condensate droplet size at the end of the line and found it to be larger than 10 microns.

Final thought. No vessel type separator will handle a liquid slug which is a whole new topic of discussion.

 

[MortenA]

Thank you to all of you. I have have a couple of good leads to go ahead with.

Best regards

Morten