Table Rock Gas Plant

In 1977, the Colorado Interstate Gas Company (CIG) built and commissioned the Table Rock Gas Plant to process and remove sour from the natural gas being produced from nearby Higgins Unit and Table Rock fields.

The inlet capacity was modified in 1988, This sour gas plant uses conventional processing techniques, beginning with three phase separation at the plant inlet to remove condensate liquids and water from the gas stream.  The gas then goes to amine sweetening for CO2 and H2S removal, prior to passing through gas dew point control, and then down the sales pipeline.  Dew point control is a dehydration technique in which ethylene glycol is sprayed into the gas stream, which is then chilled by a propane refrigeration system.  The glycol/water droplets are then recovered in a knock out drum, and the glycol is reclaimed by driving the water off in a steam heated glycol regenerator reboiler.

A reduction in plant gas processing capacity was made in 1988, after several years of declining gas availability from the Texaco Table Rock gas field feeding the plant, gas availability dropped to a low of around 7 MMSCFD during the first half of 1990.

These 1988 process changes included taking the condensate stabilizer system and the Claus sulfur plant out of service.  In addition, formerly there were two gas sweetening systems operated in series at Table Rock; a potassium carbonate absorbing system and a DEA diethanolamine absorbing system. The potassium carbonate system contactor and regeneration towers were blinded off and abandoned, while the DEA absorber was converted to a methyl diethanolamine (MDEA) amine sweetening system to remove both H2S and CO2.

At these reduced plant gas inlet rates, the sulfur volume of the acid gas stream was low enough that the ATS tail gas plant could remove enough of this sulfur to allow the plant to remain in compliance with SO2 emission standards.  Thus for about two years from 1988 to 1998, Table Rock operated while totally bypassing the three stage Claus plant.

The maximum gas processing capacity of the Table Rock plant after the 1988 modification is about 17 MMSCFD inlet rate.   In the early 1990’s, summertime inlet capacity was reduced to about 14 MMSCFD to account for loss of cooling efficiency in the amine still, due to the hotter summertime ambient temperatures (at full 17 MMSCFD summertime inlet, amine return temperatures would rise above the 130° F criteria used at Table Rock to obtain minimum H2S recovery efficiency).  Warmer amine in turn results in more gas failing to meet pipeline sulfur specifications, thus there is more potential for flaring of this off-specification gas without proper amine cooling.  Wintertime operation allows the full 17 MMSCFD operational rate however, as the amine cooling capacity produces return amine temperatures down around the more desirable 100° F range.  With the 1995 addition of a new amine aerial heat exchanger, summertime throughput around 16 MMSCFD can now be attained.

At 11 MMSCFD, a little less than 2 MMSCFD of acid gas is produced from the amine regenerator.  Table Rock focused on production of ATS with this stream. Maximum ATS production at this gas split, is around 90-95 TPD.

Plant steam is used for heat in both the dew point control system glycol regenerator and the MDEA amine regenerator reboiler.  This steam is primarily provided two 48.4 MM Btu/hr natural gas fired Erie City power boilers on site, each rated at 40,000pph steam production.  There are two waste heat boilers one on the exhaust of the Claus plant reaction furnace, and the ATS inlet incinerator.  The waste heat boilers supplement the power boilers.

During the summer of 2003 and 2004 the plant was modified to again handle the original 60 MMCFD of inlet gas.  The modification included converting the potassium carbonate system into a 1200gpm Amine unit. The sulfur plant was recommissioned to handle the increase of Acid Gas produce with the additional Inlet gas. The control system was upgraded to Delta V computer and electronic control system.  Installing new support equipment, construction of a SWD salt water injection system and well.

In June of 2005 the inlet gas flow was again at 60mmcf.

In 2008 the Plant ownership changed again.  In 2009 the plant was again modified to increase reliability and optimization.  The Boilers were replaced with two high efficiency units, each rated at 60,000pph steam production.  The incinerator was replaced with a new unit.  The Sulfur plant system was rebuilt and renewed.  The fiberglass lines in the ABS/ATS unit were replaced. Inlet compression was added to allow for lower field pressure increasing inlet gas flow.

General, News

Where Half of the Village Went

Thanks to Troy Waldner, the current OS at what is now Table Rock Gas Plant, we now have a photographic record of some of the homes that left the Village and made the trip to Rock Springs.

For visitors that don’t know the scale of this operation, 20 split-level, 4-bedroom, 2-bath, double garage homes were separated, intact, from their foundations and trucked 45 miles west along Interstate 80 to a new subdivision. As these photos show, the move involved not only a long, slow haul on a major highway, but also a switch to the wrong lane and leaving the Interstate via an on ramp.

Thanks, Troy, for providing the pictures! It’s good to know that part of the Village will survive.

Click on an image to view a larger version and/or leave comments.

Memories

Party Time at The Rock

One thing we knew how to do at Table Rock was party! Young and old alike had more than the usual share of fun. When you’re this far out in the sticks, you learn how to entertain yourselves. Of course, it didn’t hurt that we had The Rec for our dances and get-togethers and a whole lot of open space for events like the annual pit BBQ!

Click on an image below to go to a larger version, where you can leave comments, etc. I’ll be adding to this gallery and would love to have some contributions from others.

Memories

We Even Have Our Own Horror Movie

A 2001 horror movie, entitled Joy Ride, features the Lone Star Motel in Table Rock, Wyoming. Of course, the motel never existed at Table Rock, and the movie wasn’t shot anywhere near the village, but hey, we’re famous!

More info

Memories

First Memories of Tablerock

My first memory of Tablerock was before any of the houses were built. Joe sent me pictures of the wild horses and dirt piled up everywhere. I could not believe that was where he was moving us to. We have so many fond memories of Tablerock life and many sad memories also. Tablerock Village was a great place for our children to grow up. So many were not so lucky to have the friendships and the love that came from Tablerock.  Judy Burrows

General

Table Rocker Lisa Vermillion Has a New Book!

Lisa Vermillion's New BookClick the image to visit Amazon.com and see Lisa Vermillion’s new book:

Hurricane Katrina Brought Angels Too!

News

Calling all Table Rockers

This category is for those Table Rockers who’d like to share a little bit about what’s happened since leaving the Village – where you are now and what you’re up to. Let us know!

What We're Doing Now

In Memoriam: Steve Hardesty

Steve and Carlolyn Hardesty

Photo: Kevin Conner Hardesty

Steve Hardesty – Husband, Father, Respected Friend

In Memoriam

In Memoriam: Don Callendar

Don Callendar

Photo: Amy Callendar-Taft

Don Callendar – Husband, Father, Scoutmaster & Friend

In Memoriam

What Was Table Rock, Wyoming? (original)

Table Rock Road coming up!On a lonely stretch of Interstate 80 in Southwestern Wyoming, the sign that marks Exit 150 reads, “Table Rock Road”. The surroundings there piqued the curiosity of travelers through the area for three decades. Centered in a seemingly desolate landscape on the south side of the highway was a barely noticeable community. Farther south, a piercing, white beacon flashed above a complex of towers and pipes, deceptively dwarfed by the immensity of the surrounding landscape. Nighttime travelers compared the view from the highway to a battleship somehow stranded in the desert. Continue reading

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