Marine and offshore electrical supply

MODUs, jack-ups, and vessels running electrical equipment two decades past its catalog life, a long way from the nearest supply house.

Offshore, the supply problem is geography before it is anything else. A part that is a two-hour drive from a refinery is a boat or a helicopter from a vessel, and the equipment itself is frequently older than what you would find onshore, because replacing it means taking the asset out of service.

Put the need-by date on the requestThe need-by date is part of the request. We state the supportable date on the quote. If it is not achievable, we tell you before you commit.

Much of the older fleet runs gear we already know

A significant part of the older mobile offshore drilling fleet runs the same Ross Hill and NOV SCR control as land rigs: the same AutoSync modules, the same AC and DC control modules, the same bridges and phase cells. That is the deepest branch of this site. If you are working an SCR house on a jack-up or a semi, start at drilling rig electrical or the Ross Hill / NOV cross-reference.

What went down	What we supply
MODU or drillship SCR house fault. Same Ross Hill or NOV gear as a land rig.	SCR house parts, AC modules, DC modules, and power modules
Thruster, winch, or crane DC drive down. Regulator or power stack suspected.	SCR and DC drive systems
Main or emergency switchboard breaker failed and the frame is long discontinued.	Obsolete breaker cross-reference and circuit breakers
Engine room motor control failure: pumps, fans, purifiers, compressors.	Contactors and motor control, starters, and MCC parts
Pump or fan drive failed and the model is out of production.	Drives and VFDs
Transformer or control power failure on a distribution panel.	Transformers and control transformers
Replacement does not fit the original bulkhead cutout or mounting.	Fabricated enclosures, panels, brackets, and adapter plates in steel, aluminum, or stainless

What does downtime look like here?

A vessel or rig off contract offshore is not comparable to a plant outage, because you cannot drive a part out to it and you cannot bring the crew home while you wait. A missed sailing date or a slipped drydock exit moves everything downstream of it, and the logistics of getting the part to the asset are frequently a larger problem than finding the part.

Which is why we would rather tell you on day one that something takes three weeks than tell you on day fifteen.

Read this before you order

We are an equipment supplier, not a class-approved vendor. Unless original manufacturer documentation accompanies a specific unit, equipment we supply should be treated as having no type approval, and acceptability is a matter between you, your class society, and your flag state. Tell us your requirement up front. We would rather lose the order than have a unit rejected at survey.

The honest limits

We do not perform shipboard service, commissioning, or testing, and we do not provide class certification. Domestic and export ship dates are confirmed on the quote. Export documentation and international freight add time, and that timing is stated before you commit.

We are an independent supply and sourcing company, not an authorized distributor. Condition is disclosed before sale on every item we supply: new, new-surplus, used-tested, or reconditioned.

Rig or platform down with an SCR drive symptom: a gate firing pulse failure, a misfire, one leg dead? The Ross Hill SCR Drive Fault Finder maps the symptom to the suspect module and part number.

FAQ

Do you supply class-approved or type-approved equipment?

Not as a rule, and we will not imply otherwise. Where original manufacturer documentation exists for a unit we supply, it goes with the unit. Where it does not, you are buying equipment without type approval and you need to confirm acceptability with your class society and flag state before you install it. Tell us your class requirement with the request and we will tell you honestly whether what we have can meet it.

Our MODU runs the same SCR gear as a land rig. Is that in your wheelhouse?

Directly. Ross Hill and NOV SCR control is the deepest section of this site, with individual pages for AutoSync modules, AC and DC control modules, driller's console PCBs, exciter and field supply boards, bridges, phase cells, and resistor banks. The equipment does not know whether it is floating.

Can you ship to a vessel, a shipyard, or a shorebase?

Yes. Give us the ship-to, the vessel or yard contact, and the date it has to be there. Freight and any expediting charge is on the quote before you approve it. International and export shipments take longer to arrange than domestic: tell us early rather than at the end.

We are in drydock with a fixed sailing date. How fast can you actually move?

For items confirmed in stock, we state the supportable ship date before you commit. Sourced items get a real lead time. If your date is not achievable we will say so while you still have time to find another route, rather than letting you plan around a promise we cannot keep.

What condition is the equipment?

New, new-surplus, used-tested, or reconditioned, stated on the quote before you commit, with photos of the actual unit available on request. On marine work in particular, ask for the photos: corrosion history matters and you should see what you are buying.

Send it now

Request a Quote: or if it is already down, call (832) 975-8827. Email sales@edmundsonindustrial.com · Houston, TX.

Something is down right now?

Call. Do not email. (832) 975-8827.

Request a Quote