Looking for equipment alternatives to separate waxy solids from Pipeline Gas

[PKEngineer]

My company is looking for alternatives to free pipeline (12 inch) gas from entrained solids upstream of valve station. Few years back this line was being used for transferring crude oil before switching it to gas. Line has been pigged more than one time after switching but instruments (including control valve, regulators, meters and analyzers) are collecting waxy solids and need to be often cleaned and calibrated. As said, we are looking to install some equipment to prevent this waxy solid reaching to these instruments. If somebody had experience before and had looked for different technical alternatives (to install separation equipment upstream of the valve station), it would be highly appreciated to share this information.
Gas flow rate (design): 45 MMSCFD @ 800 PSIG
Pipeline length upstream of valve station: 12 miles
Gas quality: fairly dry with high in nitrogen content (up to 15%)

 

[BigInch]

Depending on how much you have, you might find some help with filters at

http://www.filters.it/index.php?method=section&id=236

you must get smarter than the software you're using.

 

[LittleInch]

I like the "fairly dry" bit. This implies sometimes you have liquids which are normally very good at stripping grease etc off anything.

I can only suggest you run a batch of something like condensate between pigs or some really good solvent to get the remaining wax out. This wax could be almost aerosol like in its consistency (have you ever seen a burger van against the sun?) so filtration may not work.

You are probably stuck with it I'm afraid - that's what happens sometimes when you change duties

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way