Dehydrate Natural Gas with Zero Operational Emissions and No Moving Parts

What is a  Passive Dehydration System® (PDS)?

Croft Production Systems, Inc. has developed a solid desiccant dehydrator that is a safe, easy, and effective method for natural gas dehydration; CROFT will properly size and lease a system to meet your needs. When signing a lease with CROFT, you will have a dedicated account representative and service manager over your location because your success is our success.

Croft has dehydrated 20 Mcfd - 180,000 Mcfd.

Passive Dehydration System®: the alternative method to the Triethylene Glycol Unit.

Why Choose a Passive Dehydration System over a Glycol Dehydrator?

So why choose a PDS over TEG  or glycol dehydrator? In today’s competitive environment, evaluating performance, and identifying alternative methods for natural gas dehydration is becoming increasingly important.

This process wastes gas, costs money, and contributes to local air quality problems as well as global climate change.

There are three main benefits that you will receive with choosing CROFT's Passive Dehydration System®(PDS) over the traditional Trietylene Glycol (TEG) unit.

  • Economical: Save the extra time and money that would be spent on obtaining an air permit. Preserve your gas stream, eliminate emissions, and save money by choosing our dehy units.
  • Environmental: Glycol dehydrators vent methane, volatile organic compounds (VOCs), and hazardous air pollutants (HAPs) to the atmosphere from the glycol regenerator and also bleed natural gas from pneumatic control devices. Our Passive Dehydration Systems have zero operational emissions.
  • Safety: Unlike glycol units, dry desiccant dehydration units have no moving parts or open flames

Learn more about the advantages of our Passive Dehydration System over a TEG Unit. 

Natural Gas Adsorption Method

CROFT's Passive Dehydration System uses an adsorption process to dehydrate natural gas.  This works by wet gas passing through the vessel and collecting on the surface of the solid-desiccant material, which we call enviroDRI. The enviroDRI adsorbs the water and dissolves into a non-hazardous brine solution that can be drained to the water storage on location.

Solid desiccant dehydration units have a high adsorption capacity, and a low resistance to gas flow to minimize pressure drop, are both non-flammable and non-corrosive, and are inexpensive to fill.

How a Passive Dehydration System Works

This dehy unit works by wet gas flowing upward through a series of dry desiccant vessels each containing our specifically formulated enviroDRI® desiccant. This product absorbs the moisture and dissolves into a brine solution that is drained to the water storage on location. This product is a non-hazardous material that has no special disposal requirements. This gas dehydration unit is designed on a 30-60-day service cycle. During this time frame, the CROFT service team will visit the location to conduct all preventative checks, and maintenance, and handle the refilling of the product.

CROFT recommends the design to have two or more bottles in order to continuously dehydrate the gas while one of the vessels is being serviced, avoiding shutdowns. This state-of-the-art modular design can be utilized to add or remove dehydration capacity to accommodate any long-term fluctuations in gas volume.

Supply Gas Dehydrator

This is a smaller version of our Passive Dehydration System®. We developed this equipment due to the increased customer demand for smaller sized dehydration units. This unit differs from our PDS® in that it is able to be purchased. We will continue to utilize our specifically designed enviroDRI® desiccant; it is now more conveniently packaged and is able to be shipped to your destination. This unit utilizes the same technology as our larger systems so that consumers will experience the same benefits. Its main goal is to accommodate the dehydration of smaller volumes of gas streams by using our industry-leading design.

PDS Frequently Asked Questions

The enviroDRI® desiccant that Croft Production Systems utilizes as its drying agent is a proprietary blend of non-toxic desiccant pellets that are used in our Passive Dehydration Systems. This desiccant is utilized in order to reduce the amount of water content in the natural gas stream to meet or exceed the pipeline specifications. After many years of research and development on the material makeup and form of desiccant, CROFT has determined that our enviroDRI is the most effective and eco-friendly drying agent that can be used in order to dehydrate natural gas. 

Learn more: https://www.croftsystems.net/oil-gas-blog/oil-gas-desiccant-dehydration/