Gas Engineer in Houston, TX | Gas Facilities EPCM

Gas engineering at the end of every pipeline in America

On the morning of 10 January 1901 a well on a salt dome south of Beaumont, ninety miles east of Houston, threw its drill pipe out of the hole and produced a gusher that ran uncontrolled for nine days. Spindletop produced more oil in a day than the rest of the American wells combined, and the effect on Houston was immediate and permanent. Within a decade the city had a dredged ship channel, refineries along its banks and a business community that thought in barrels. Natural gas, at that point, was mostly a nuisance to be flared. It took another half century for the pipeline network to make gas a commodity, and today Houston sits at the convergence of more gas transmission capacity than any other city on earth.

Everything about gas engineering here is shaped by that convergence. The Permian, the Eagle Ford, the Haynesville and the Gulf of Mexico all deliver into a market whose prices are set a few miles from our office, and the Gulf Coast liquefaction terminals at Freeport, Sabine Pass, Corpus Christi and Port Arthur have turned what was a continental market into a global one. A processing decision made at a plant in West Texas is now connected, through a chain of contracts, to a cargo destination in Asia or Europe. That has raised the stakes on specification, reliability and measurement in ways that older engineers find genuinely novel.

Houston is a company town for this business in the way Detroit once was for cars, and it has the same effect on the labour market. The people who design gas plants, the people who build them, the people who licence the technology and the people who finance them all live inside the same beltway, eat at the same taquerias and send their children to the same schools. Technical problems get solved quickly here because the person who has already solved them is usually a short drive away.

Gas processing and treating plant engineering

Tundra’s gas engineering group designs and assesses the full processing chain: inlet separation and slug catching, dehydration by glycol or molecular sieve, amine treating for carbon dioxide and hydrogen sulphide, mercury and oxygen removal where the stream demands it, nitrogen rejection, refrigeration and cryogenic liquids recovery, fractionation, compression, and the relief and flare systems that hold it all together. We do the process modelling, the heat and material balances, the equipment sizing and specification, the hydraulics and the operating envelope work, and we do the parts nobody enjoys — the relief scenarios, the utility loads and the turndown cases that determine whether the plant is operable at forty percent of design.

Gulf Coast projects carry specification pressures that inland projects do not. Gas destined for liquefaction has to meet extremely tight limits on carbon dioxide, water and heavy hydrocarbons, because anything that freezes at cryogenic temperature will eventually stop the train. Petrochemical feedstock buyers along the Ship Channel have their own contaminant limits. A plant designed to meet a pipeline sales spec is not automatically capable of meeting either, and a great deal of our work is the gap analysis between what a facility produces and what a new buyer requires.

Third-party processing is the other recurring theme. Midstream operators here compete for volume, and the ability to state a firm capacity with confidence — backed by a model that closes against real operating data — is a commercial asset. We produce that number and we write down the assumptions behind it, because the number will be quoted in a contract long after the study is forgotten.

Gas refrigeration on the Gulf Coast

Refrigeration is where liquids revenue is made, and Houston’s climate makes it harder than it looks. Ambient design temperatures are high, humidity is relentless, and air-cooled exchangers that perform adequately in a dry climate lose capacity on an August afternoon when the dew point is near the dry bulb. Cooling water systems fight fouling and biological growth in warm brackish supply. A refrigeration package that was specified against generic ambient assumptions will underdeliver in exactly the months when gas demand and liquids pricing are least forgiving.

Our work covers propane and mixed refrigerant loops, mechanical refrigeration packages, turbo-expander plants and the trade-off analysis between them: how much ethane recovery is worth pursuing, whether ethane rejection capability is required, what the compression consequences are, and how the plant behaves in shoulder conditions. We also look hard at what happens during a hurricane shutdown and restart, because a refrigeration system that takes three days to get back to spec after every storm has a hidden annual cost that no vendor curve shows.

Fugitive emissions studies

Emissions work has moved from a compliance chore to a commercial requirement in a remarkably short time. Under the federal methane rules and the Texas Commission on Environmental Quality’s permitting regime, operators must survey, quantify, repair and report; under the terms buyers and lenders now impose, they must also demonstrate a downward trend. For gas destined for export, the carbon intensity of the molecule has become part of the negotiation.

Tundra performs and reviews fugitive emissions programs: optical gas imaging surveys, component counts and emission factor inventories, quantification, leak repair tracking and re-survey, and the engineering studies that identify where the volume actually comes from. It is almost never the flanges. Pneumatic controllers, compressor rod packing and seals, tank vents, glycol still columns and unlit or poorly performing flares dominate most inventories, and each has a retrofit option with an assessable payback.

Satellite and aerial monitoring have changed the pressure considerably. Emissions that were once known only internally are now observed from orbit and published, and the Permian Basin in particular has been the subject of a great deal of unflattering imagery. Operators who get ahead of that with a credible internal program are in a much better position than those who respond to a press release.

Weather, water and the design conditions nobody escapes

Houston is flat, warm and prone to extraordinary rainfall. Hurricane season runs from June to the end of November, and Harvey in 2017 delivered more than fifty inches of rain in a few days, flooding plants that had never flooded and taking a substantial share of national refining capacity offline. Storm surge governs equipment elevation near the coast; wind loading governs structural design; and the practical business of shutting a plant down safely, riding out a storm and restarting it is an engineering activity that Gulf Coast facilities budget for.

Then there is the opposite failure. Winter Storm Uri in February 2021 froze instrument lines, knocked out gas supply and took down the Texas grid, and it exposed how little winterisation existed in a region that assumed it would never need any. We now include freeze protection review in facility assessments as standard, and clients who would once have considered it a waste of money no longer argue.

The city outside the plant gate

Houston repays anyone who bothers to look past the freeways. The Museum District has nineteen institutions inside a couple of square miles, including the Menil Collection, which is free, and the Rothko Chapel next door, which is one of the quietest rooms in North America. Hermann Park, the Japanese Garden and the miniature train are where half the city spends a Sunday. Buffalo Bayou Park runs from downtown west past the cistern, an abandoned underground drinking water reservoir now open as an installation space, and at dusk a quarter of a million bats pour out from under the Waugh Drive bridge.

The food is the real argument. Viet-Cajun crawfish in Alief, Tex-Mex in the Heights, barbecue that draws queues before opening, and a Chinatown out on Bellaire Boulevard that runs for miles. The Houston Livestock Show and Rodeo fills the stadium for three weeks each spring and is, improbably, one of the largest scholarship funders in the state. This is a working city that eats well and does not stand on ceremony, which suits engineers.

Why the Houston office

Because the plants, the packagers, the licensors and the specialists are here, and because a gas engineer who can be on site in an hour finds things that a phone call does not. Because the Gulf Coast market rewards speed, and because a firm that has run the same calculations for producers, midstreamers and terminal operators sees the whole chain rather than one link of it.

If your plant is missing spec, your liquids recovery has quietly drifted, your refrigeration package is not making its numbers in summer, or your emissions inventory will not survive scrutiny, those are the problems this group works on every week.