Sentrimax independently repairs oilfield solids control centrifuges, including Hutchison Hayes, SWACO 414, SWACO 518, Lynx 40 and Lynx 500 units, at its Mansfield, Edmonton and Kitchener facilities. Drilling mud duty and abrasive solids wear scrolls and bearings faster than most other applications, and much of this fleet is legacy equipment served through reverse-engineered parts. Sentrimax is not affiliated with them.
Independent repair for oilfield solids control equipment
Sentrimax Centrifuges is an independent maintenance, repair and overhaul provider founded in 2002, with no dealer agreement, distribution arrangement or sponsorship relationship with Hutchison Hayes, National Oilwell Varco (which markets the SWACO line) or the manufacturers of the Lynx product line. Brand and model names on this page identify the equipment Sentrimax services; they are not a claim about who supplies parts or trains technicians. Solids control equipment gets a page of its own because drilling mud duty is a different problem from municipal or industrial dewatering, and the fleet running it today is old enough that OEM parts support is a real, ongoing concern rather than a hypothetical.
Sentrimax’s process, in brief
Every solids control unit goes through the same documented sequence: inspection and quote, repair, and delivery. Given how much faster abrasive drilling mud wears these machines relative to their age, the inspection stage carries extra weight — the 75-point check, precision fit measurement and third-party oil analysis are what separates a routine scroll and seal job from a project that also needs bowl bore repair or a full casting replacement.
Solids control models Sentrimax services
| Model | Typical duty | What Sentrimax handles |
|---|---|---|
| Hutchison Hayes decanter models | Drilling mud solids control, skid or trailer mounted | Full teardown, reverse-engineered or machined parts, gearbox service, balancing, test run |
| SWACO 414 | Drilling mud solids control | Fit evaluation, parts manufacture, balancing, test run |
| SWACO 518 | Drilling mud solids control | Fit evaluation, parts manufacture, balancing, test run |
| Lynx 40 | Drilling mud solids control | Fit evaluation, parts manufacture, balancing, test run |
| Lynx 500 | Drilling mud solids control, higher-capacity duty | Fit evaluation, parts manufacture, balancing, test run |
These five model lines make up the core of the solids control fleet Sentrimax sees. A unit outside this list is evaluated against the same 8″ to 43″ bowl diameter range and drilling mud duty profile Sentrimax services generally, using the same inspection standard regardless of which of the five named models it is.
Why drilling mud duty destroys scrolls faster than anything else Sentrimax sees
A decanter dewatering municipal sludge and a decanter processing drilling mud are doing the same mechanical job — separating solids from liquid by centrifugal force — but the material going through them is not comparable. Drilling mud carries abrasive formation solids, weighting agents and cuttings that grind against the bowl, scroll flighting and bearing seals with every pass. Where a municipal decanter might wear gradually over years, a solids control unit running abrasive mud can wear a scroll’s hardfacing through in a fraction of that service life. That is the single biggest reason solids control equipment shows up for overhaul more often, relative to its age, than equipment in gentler applications.
The practical result is that scroll condition, hardfacing renewal and bearing seal integrity get more attention on a solids control inspection than they might on a municipal unit of the same age. Sentrimax’s inspection accounts for this duty cycle specifically rather than applying a generic wear expectation across every application.
Redeployment changes the inspection, too
Solids control units are routinely skid or trailer mounted and redeployed between well sites, which means mounting hardware, vibration isolation and structural fatigue on the skid or trailer frame itself are part of what Sentrimax checks — not just the centrifuge bolted to it.
Legacy parts support on Hutchison Hayes and older SWACO and Lynx units
Hutchison Hayes units in particular are largely legacy equipment, and OEM parts support for older configurations has thinned the way it has for other decades-old brands. Sentrimax’s answer is the same engineering and machine shop capability applied to any legacy platform: milling, lathe-turning, precision grinding, and designing new or reverse-engineered parts when an original part number no longer resolves through any supplier. On a solids control unit, this usually means scroll flighting, wear liners and bearing housings — the components abrasive duty wears out fastest and the ones most likely to have aged out of a parts catalog.
What happens to a solids control unit once it arrives
- Inspection and quote. The unit is documented and ID-tagged, an oil sample is drawn for third-party analysis, the rotating assembly is disassembled and steam-cleaned, and a licensed technician runs a 75-point inspection with precision fit measurements, with particular attention to scroll and hardfacing wear given the duty cycle. A full inspection report, scope of work, required parts, photos, pricing and estimated delivery time make up the quotation package.
- Repair. Parts are manufactured or sourced to meet or exceed OEM specifications, welding and machining bring components to tolerance, hardfacing is renewed where abrasive wear requires it, the unit is balanced to ISO G 0.5, reassembled, inspected again, and run on the test stand.
- Delivery. The rebuilt unit ships through a dedicated broker network, with the skid or trailer mounting reinstated where applicable, plus a full invoice and tracking.
Every solids control job includes
- Fit evaluation against original or OEM tolerances
- Detailed, annotated inspection report covering scroll and hardfacing wear
- Dynamic balancing, up to ISO G 0.5
- Full test run with performance report
Failure patterns specific to solids control duty
| Symptom | Likely cause on solids control equipment | What the inspection checks |
|---|---|---|
| Rapidly falling cake dryness | Scroll hardfacing worn through by abrasive mud solids | Scroll flighting and hardfacing condition |
| Vibration developing over weeks rather than years | Accelerated bearing or seal wear from abrasive duty | Bearing fits, seal cavity condition, dynamic balance |
| Mounting or frame cracking | Fatigue from repeated skid or trailer redeployment | Skid or trailer frame and mounting hardware inspection |
| Gearbox contamination or premature wear | Seal failure allowing mud solids into the gearbox | Gearbox teardown, seal inspection, contamination check |
When to pull a solids control unit from service
A fast drop in cake dryness on drilling mud duty usually means the scroll has already lost meaningful hardfacing, and running it further risks damaging the bowl bore underneath, which turns a scroll repair into a bowl repair. Vibration that develops over days rather than months is a bearing or seal failure in progress and should be pulled immediately, not scheduled around.
Keeping a rig running during the rebuild
Downtime on a solids control unit is downtime on an active drilling operation, and Sentrimax’s rental fleet exists to cover exactly that gap — a rental centrifuge to keep mud processing running while the primary unit is inspected, repaired and tested at one of Sentrimax’s three facilities.
Where the work happens, and what else Sentrimax covers
Sentrimax operates three facilities — Mansfield, Texas; Edmonton, Alberta; and Kitchener, Ontario — and supports oil and gas operations across North America from those three shops, with field service technicians and remote services for on-site work. Sentrimax’s mobilization capability, including trailer mounting, skid mounting and custom Sea-Can or CONEX container layouts, is directly relevant to this equipment class since so much of it is designed to move between sites. The centrifuge parts program covers OEM-spec and reverse-engineered components for solids control brands, and the decanter centrifuge repair page details the process behind every rebuild. See the full brand list at centrifuge brands and models serviced.
Gearboxes and controls on solids control units
Solids control centrifuges commonly run planetary reduction gearboxes, and abrasive mud that finds its way past a failed seal contaminates the gearbox as readily as it wears the bowl. Sentrimax’s gearbox capability — two- and three-stage planetary gearboxes, CYCLO gearboxes and hydraulic backdrives — covers that contamination damage directly rather than treating it as a separate problem from the bowl repair. Control panels on skid or trailer-mounted units also take a harder environment than a fixed installation, and Sentrimax’s PLC, HMI and VFD work, including ETL-certified control panel and automation support, extends to control systems built for that mobile, exposed duty.
A note on rebuild versus replace
Sentrimax’s full overhaul, equipment and part sales capability means a replacement or refurbished solids control unit is a real option to weigh against a rebuild when abrasive wear has reached the bowl bore or base casting, rather than committing to a repair regardless of what the inspection finds.
Field service for equipment already on location
A solids control unit already mobilized at a well site is not always practical to demobilize for a shop visit, especially mid-operation. Sentrimax’s field service technicians and remote services cover on-site diagnostic work and select repair scopes without requiring the unit to leave location, with the extent of what can be done on site depending on what the initial diagnostic finds.
Get a solids control unit evaluated
Send the model, current mounting (skid, trailer or fixed), symptoms and duty history, and Sentrimax will scope an inspection at whichever facility fits the shipment.
Frequently asked questions
Why does drilling mud duty wear out a centrifuge faster than municipal use?
Drilling mud carries abrasive formation solids and weighting agents that grind against the scroll, bowl and seals with every pass, wearing hardfacing and bearing seals far faster than gentler applications like municipal sludge dewatering. This is the main reason solids control units come in for overhaul more often relative to their age.
Can Sentrimax service a Hutchison Hayes unit even if OEM parts are no longer available?
Yes. Hutchison Hayes fleets are largely legacy equipment, and Sentrimax's machine shop measures worn components and manufactures replacements designed to meet or exceed the original specification when an OEM part number no longer resolves.
Does Sentrimax handle the skid or trailer, or just the centrifuge itself?
Both are inspected. Redeployment between well sites causes fatigue in mounting hardware and the skid or trailer frame itself, so Sentrimax checks that structure alongside the centrifuge and can reinstate mounting as part of the rebuild.
What is the difference between the SWACO 414 and SWACO 518?
Both are solids control decanters built for drilling mud duty; the specific fit, wear and gearbox details vary by unit condition and configuration, which Sentrimax's inspection documents case by case rather than assuming from the model number alone.
Is a rental solids control centrifuge available while mine is being repaired?
Sentrimax maintains a rental fleet specifically to cover process gaps like this, since downtime on a solids control unit is downtime on an active drilling operation.
Does Sentrimax repair Lynx 500 units differently from Lynx 40 units?
The inspection and repair approach is the same process across the Lynx line; the difference is scale and duty capacity, which is reflected in the parts and time required rather than the repair method itself.
Talk to a centrifuge specialist
Send us the machine details and we will come back with an inspection scope and a quote.