Do you dread the anticipation of having to clean out your TEG? Having to shut down your operation for a few weeks? Here at CROFT we offer a mobile Passive Dehydration System.
It is a quick, easy and a temporary way to bypass a TEG and continue to dehydrate the gas while your TEG is shut down getting serviced/cleaned out.
Our PDS is a very simple system. It has no moving parts, no powered components, no fires, no boilers, no permits required, and has a modular system structure that has limited emissions. Our PDS is a non-regenerative system, which means it uses a deliquescent adsorbent to dry the gas. The desiccant we use in our system is called enviroDRI, which is a hydroscopic compound that adsorbs water vapor.
Passive Dehydration System Steps
Step 1: The PDS accepts wet gas through the Gas In Valve
Step 2: Water vapor is removed as gas moves through the vessel
Step 3: Gas Enters the sales line per pipeline specifications
Step 4: Time to refill
The Recommended TEG Cleanout Steps:
The steps below do not comprise of all the actions in a TEG cleanout, and do not necessarily all have to be completed, but are suggested. As you can see the list of items will take a while to complete. We recommend installing a PDS unit while cleanout is being done. This process is typically smoother and less installation will be involved.
- Drain system of existing fluids.
- Flush unit until clean and drain.
- Remove, clean, and inspect burner flare arrestor assembly.
- Remove burner and clean orifice and burner assembly. Replace pilot assembly with BMS pilot.
- Remove and clean packing from still column. Replace if necessary.
- Make new still column and smoke stack gasket.
- Disassemble piping and inspect for corrosion and buildup. Clean if necessary.
- Replace and missing glycol piping.
- Inspect and hydrotest
- All ASME code pressure vessels
- Glycol/glycol heat exchanger
- Still Column Coil
- Open filters, inspect and clean. Replace elements.
- Replace Kimray pump with Kimray tested pumps.
- Replace all valves 1” or less if not easily moveable.
- Test operation and integrity of all larger valves. Replace seals of any union valves.
- Replace entire fuel gas and instrumentation system. New piping, valves, regulators, gauges, etc. Pneumatic instrumentation system will be piped for outside air supply.
- Install Platinum BMS system. Solar powered with battery backup, Pilot ignition system.
- Wire all electronic instrumentation into the BMS or on-skid junction box. Test functionality.
- Replace insulation on slash tank, redo caulk on reboiler.
- Replace all control valves and level controllers with new.
- Replace sight-glasses glass tubes and isolation valves.
- Tube all pneumatic controllers into instrumentation system. Test for functionality.
- Replace all PSV’s with new.
- Remove Stack Arrestor.
Again, these steps take time. Installing a PDS temporarily during a cleanout can save money and time without loss of production. The picture below shows a quick temporary installation of a PDS dehydrator while the client’s TEG is being cleaned out and preventative maintenance is to be completed.
If you are interested in a TEG, PDS or a TEG Cleanout option, CROFT can help with all gas processing solutions.
