Bi-directional oil filter for natural gas

Lots of different styles of liquid knock out on the market.. What do you mean by bi directional? Gas needs to be able to flow either direction and knockout still works?

Gas usually only flows one direction in a natural gas pipeline, most knock out systems rely on unidirectional flow...

Maybe they could engineer unidirectional filters to handle both directions by using one way valves and two filters.

The gas pipeline is used bi-directional. A bi-directional filter would eliminate the need for installing two filters (one for each direction) and two bypass lines.

How is this one? http://www.sidcofilter.com/store.asp?pid=4224

I don't think that the filter described in your link can be bi-directional without modification!

Look for a two chamber filter separator. It'll have two levels and controllers. In the backward position, you may not be as efficient and have a more pressure drop. It seen then work in our gas storage field. You can see if PECO or POROUS MEDIA will gaurentee bidirectional use. This takes 1 filter and three valves

If you want tru bidirectional with by-pass, then you'll need 1 filter and 5 valves. Or you can use 2 filters and 4 valves.

I got to thinking, 10-15 micron is pretty small, maybe what you really need is dewpoint control?

These guys can probably help:

http://www.gastecheng.com/dewpoint_photo.html

Or these guys

http://www.hanover-co.com/html/ptDCS.html

I think what you may be looking for is a rectifier circuit like this one. The flow through the filter is always the same regardless of flow in the main pipeline. Only four check valves required.

Rectifier Bridge Configuration by BJ #7 with an internal one -way Oil catcher will do.

I shall however suggest an Electrocoagulating mist eliminator instead. Nobody world wide might have tried that yet--but it should-nay , will work . Basically Plus+ minus_ volt s on metal screens arranged as Chevrons thrugh which Gas will pass through.Oil will stick and form drops on Chevron Plates.Oil will drip down to a pool below. There will be level sensor/control which will let oil out to a catch chamber #1 and later to Catch Chamber#2 -maybe through Catch Chamber#3 and finallyto outside of pressurized pipe. Gas flow can be either way=BIDIRECTIONAL. Volt reversal may be needed--and this is externally.

Maintenance of the whole of this Oil Catcher System-OCS- can be a rare event.

In any case This OCS can be as short as 2 metres. 2 flanged ends to bolt to 2 gate valve flanges allowing pipe to shut off with Gas inside. Voltage will be fed through Ceramic feedthrough insulators . Volts between electrodes are likely to be 6KVDC. Not to worry too much about fire--no Oxygen inside!

OCS needs multiple trials and high level vetting. Maybe you can get IPR to recover costs.