Paul Industries fabricates and installs process piping for Wyoming soda ash and industrial mineral operations. The Green River Basin holds the largest and among the highest-purity known trona deposits in the world, an estimated 127 billion tons, and roughly half of global natural soda ash capacity sits on top of it. The piping that serves it handles hot alkaline brine carrying dissolved and suspended solids, which is a service that attacks metal chemically and abrades it mechanically at the same time.
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Why this service is harder than either problem alone
Trona is sodium sesquicarbonate. Whether it is reached by underground mining or by solution mining, the processing route dissolves it, purifies the solution, and crystallizes sodium carbonate out of it. That means the plant is full of hot alkaline liquor at various concentrations, and at several points that liquor is deliberately supersaturated because crystallization is the product step.
A deliberately supersaturated solution moving through pipework will crystallize anywhere conditions favor it, and pipework offers plenty of such places: a cold spot, a rough patch, a weld root protruding into the bore, a low-velocity region, a pressure drop across a valve. That is scale, and it is not a maintenance nuisance in this service. It is the process trying to happen in the wrong location.
Simultaneously the liquor carries solids, from ore fines upstream through to product crystals downstream, and those solids abrade. So the same line is losing metal to erosion in the high-velocity regions and gaining scale in the low-velocity ones, and the two problems have opposite remedies. Raising velocity to keep solids in suspension and discourage deposition accelerates wear. Lowering it to reduce wear encourages scaling.
The design work is therefore about finding the window rather than optimizing a single variable, and that window is narrower than most services allow.
Where each problem lives, and what to do about it
| Location | Dominant mechanism | Response |
|---|---|---|
| Outside radius of bends | Erosion from suspended solids | Long radius, wear allowance, replaceable sections |
| Downstream of valves and orifices | Scaling from local pressure drop | Minimize throttling; flush access |
| Low-velocity and dead regions | Deposition and blockage | Design out; slope and drain |
| Cold spots and uninsulated sections | Crystallization on the wall | Insulation and tracing continuity |
| Weld roots protruding into the bore | Nucleation site for scale | Full penetration, smooth internal profile |
| Heat exchanger surfaces | Scaling, then loss of duty | Cleanable design; access designed in |
The weld root row is worth emphasizing because it is entirely within a fabricator’s control and it is frequently ignored. In a scaling service, a weld with excess penetration protruding into the flow is not a cosmetic defect. It is a permanent nucleation site that will accumulate scale from the day the plant starts, and it will do so at every weld made the same way. Internal weld profile in this service is a process requirement, and it is one of the few places where good fabrication practice pays back continuously rather than once.
| Continuous load | Per year | Over ten years |
|---|---|---|
| 25 kW | $17,432 | $174,320 |
| 50 kW | $34,865 | $348,650 |
| 100 kW | $69,730 | $697,300 |
Wyoming industrial power at 7.96 cents per kilowatt-hour sits just under the 8.13 cent national average (EIA, 2024), which makes tracing and insulation cheap relative to what they prevent. In a crystallizing service that matters more than the number suggests: a line that loses temperature does not gradually underperform, it plugs, and a plugged liquor line in a continuous plant is an outage rather than a work order.
Materials, and the fact that stainless is not automatically the answer
Hot caustic and carbonate service is one of the few places where reaching for 300-series stainless can make a problem worse rather than better, and the reason is caustic stress corrosion cracking. API RP 571 addresses it at section 3.15, and carbon, low-alloy and 300-series stainless steels are all susceptible, while nickel-base alloys are generally more resistant. Increasing caustic concentration and increasing temperature both raise the likelihood and the rate.
So the material decision has to be made against the actual concentration and temperature at each point in the plant rather than against a general description of the service, and the answer legitimately varies from one line to the next in the same building. Where cracking is credible, the mitigations are post-weld heat treatment, alloy selection, or keeping the service conditions out of the susceptible range, and the first of those is the one most often omitted on a fabrication that was priced without it.
Our piping work follows ASME B31.3 with the fluid service category determined and documented, and where post-weld heat treatment is required by the material specification or by the service assessment, it is carried out and recorded rather than assumed unnecessary. Welder and procedure qualification follows ASME Section IX. Material certification is supplied to the type the client’s quality organization requires, and where higher alloys are specified, the welding procedure is matched to the material rather than borrowed from carbon steel practice.
Standards referenced: EIA electricity price data · ASME BPE · ASME B31.3 · ASME Boiler and Pressure Vessel Code
Frequently asked questions
Do you install process piping for Wyoming mineral plants?
Yes, across Green River, Rock Springs, Casper, Cheyenne and statewide: liquor and brine piping, slurry lines, steam and condensate, heat exchanger interfaces, tracing and insulation systems, pressure testing and the documentation package.
Why is soda ash liquor a difficult service?
Because two mechanisms act together with opposite remedies. The liquor is deliberately supersaturated at points because crystallization is the product step, so it scales wherever conditions favor it; and it carries solids that abrade. Raising velocity to prevent scaling accelerates wear, and lowering it to reduce wear encourages scaling.
Where does scale form first?
Wherever the pipework gives it a reason: a cold spot, a rough patch, a weld root protruding into the bore, a low-velocity region, or the pressure drop across a throttled valve. In this service scale is not a nuisance, it is the process happening in the wrong location.
Does weld quality really affect scaling?
Directly and permanently. A weld with excess penetration protruding into the flow is a nucleation site from the day the plant starts, and if the welds were all made the same way, every one of them is. Internal weld profile in a scaling service is a process requirement rather than a cosmetic one.
Is stainless steel the right material here?
Not automatically, and this is one of the few services where reaching for 300-series stainless can make things worse. Carbon, low-alloy and 300-series stainless are all susceptible to caustic stress corrosion cracking per API RP 571 section 3.15, while nickel-base alloys are generally more resistant.
How should material be selected then?
Against the actual concentration and temperature at each point in the plant, not against a general description of the service. Both raise the likelihood and rate of caustic cracking, so the correct answer legitimately differs from one line to the next within the same building.
What is post-weld heat treatment for?
Relieving the residual tensile stress that caustic cracking requires. Cracking most often appears adjacent to welds that were not post-weld heat treated, so where the service assessment says cracking is credible, PWHT is a real requirement rather than an optional refinement. It is also the item most often priced out of a fabrication.
How do we manage a line that both wears and scales?
By designing for a velocity window rather than optimizing one variable, and by accepting that some locations will need periodic attention. Long radius bends with wear allowance at the erosion points, and flush and clean-out access at the scaling points, so neither problem requires cutting the line open.
Does tracing matter that much?
More than the energy cost suggests. At 7.96 cents per kilowatt-hour, just under the national average of 8.13 (EIA, 2024), tracing is cheap. A liquor line that loses temperature does not gradually underperform, it plugs, and in a continuous plant that is an outage rather than a work order.
How do I get a quote for a Wyoming piping project?
Use the form on this page or call 201-450-8280. Useful inputs are line sizes and routes, liquor concentration and temperature at each point, solids loading, where the plant currently experiences wear or plugging, and whether post-weld heat treatment is in the specification.
When is lined pipe used for liquor and slurry?
Rubber-lined or HDPE-lined steel where abrasion dominates and the temperature allows the lining, giving wear resistance at lower cost than solid alloy, with the lining inspected at the bends where it wears through. Linings are excluded from the hottest liquor lines where they would fail.
What flange and gasket practice suits hot caustic liquor?
Gaskets that tolerate hot caustic without hardening or extruding, flanges with faces that seal without crevices where liquor would concentrate, and bolting in a grade that resists caustic attack, torqued and retorqued after the first thermal cycle. Flange leaks on liquor lines scale over and are found late.
What pump types and materials serve liquor and slurry?
Slurry pumps with hardened or elastomer-lined wet ends for crystal slurry, and centrifugal pumps in alloys resistant to hot caustic for clear liquor, with seals or packing chosen for the crystallising fluid. The pump wet end is a wear part in either service.
Which valve types suit scaling service?
Knife gate and plug valves, which do not trap liquor in cavities where it scales, with full-bore designs that can be rodded, and with valve actuation sized to break scale. Globe and conventional ball valves scale shut.
How is instrumentation kept working in scaling service?
With non-intrusive flow measurement such as magnetic or clamp-on ultrasonic meters, level measurement by radar or differential pressure with purged legs, and temperature wells designed to shed scale. Intrusive instruments scale over and read wrong before they fail.
How is liquor piping routed to avoid scale-prone pockets?
Without dead legs, low points or stagnant branches, with continuous fall to drain points, and with tees and reducers arranged so that flow sweeps every surface. Scale forms where liquor stops, and the routing keeps it moving.
How is the evaporator train's steam and condensate system designed?
With steam distribution sized for the train's duty, condensate return from each effect and flash recovery between effects, and with the condensate quality monitored for liquor carryover before it returns to the boiler. The steam system is where the plant's energy is spent, and the train's design decides how efficiently.
How are liquor lines cleaned?
By flushing with hot water or dilute solution to dissolve scale, or by mechanical means at access points, on a schedule set by pressure drop. Lines are designed with flushing connections and clean-outs.
How do solution mining and underground mining differ for piping?
Solution mining produces liquor from the start and the plant handles it from the wellhead; underground mining produces ore that is dissolved at the plant. Solution mining piping handles more liquor at more locations and its brine chemistry is set by the well.
What about slurry lines carrying crystals?
Crystal slurry to filtration and drying is abrasive and settles, and its lines follow slurry practice: velocity, gentle bends, wear materials and flushing. The crystals the plant made are the abrasive.
How is corrosion under insulation handled in Wyoming?
Insulated hot lines wet from snow and condensation corrode under the insulation, and inspection at breaks and low points with sealed jacketing apply. The climate makes it a prominent mechanism.
How is the calciner side piped?
Hot gas, steam and carbon dioxide from calcination are handled in refractory-lined or high-temperature ducting and piping, with corrosion from the moist, carbonate-laden gas at cool points. It is a high-temperature discipline.
What welding and documentation apply?
Process piping to ASME B31.3 with qualified welders and procedures, post-weld heat treatment records where required, and examination to the fluid service. The heat treatment records are what a later cracking investigation needs.
How are piping projects scheduled at a trona plant?
Around planned outages, with prefabrication and heat treatment done in the shop and field work limited to tie-ins. Field heat treatment is possible but slower.
How are outdoor liquor lines protected in a Wyoming winter?
With tracing and insulation sized for the plant's design low temperature and wind, because liquor that cools crystallises solid in the line, and with drainage for lines that are taken out of service. Wyoming winters find every gap in the tracing.
Two ways to get the ore out, and they hand the plant different problems
Trona reaches the surface by one of two routes, and which one a site uses changes the piping discipline before the process even begins.
Conventional underground mining brings up solid ore, which is then crushed, calcined to drive off carbon dioxide and water, and dissolved. The plant receives a solid and makes its own liquor, which means the front end is a dry bulk handling problem: chutes, conveyors, mills and the dust that all of that generates. Ore also arrives with insolubles, and those insolubles have to be separated and disposed of, which puts a slurry stream into the plant that carries genuinely abrasive material rather than product crystals.
Solution mining injects water or recycled liquor into the deposit, dissolves the trona in place, and pumps the resulting solution to surface. There is no ore handling, no crushing, and very little dust, which removes an entire category of problem. What it adds is a long well-field piping system operating in an exposed high-desert environment, carrying a solution that is already close to saturation when it starts and that changes temperature substantially between the deposit and the plant.
That last detail is the one worth designing around. A solution pumped from depth arrives warm and cools as it travels, and a nearly saturated solution that cools deposits solids. So the surface gathering lines in a solution-mined operation are a scaling service by construction, running through a climate where winter ambient does the cooling for free and where the lines are long, remote and expensive to reach.
The engineering that follows is specific: insulation continuity across the whole run rather than on the accessible sections, tracing sized against genuine winter ambient rather than an annual average, pigging or flushing provision designed in rather than retrofitted, and isolation arranged so a section can be taken out and cleared without shutting the field. On a long remote run, the ability to clear a plug without a crew standing in the open in January is worth considerably more than the capital it costs.
We work on both routes: dry handling, conveying and dust systems on the conventional side, and well-field gathering, insulation, tracing and clearing provision on the solution-mined side, plus the liquor, crystallizer and dryer piping that both routes share downstream.
Wear or plugging on a Wyoming liquor line?
Tell us the concentration and temperature at the failure point and whether it wears or scales. Those two facts point in opposite directions and decide the fix. Call 201-450-8280 or use the form below.