LNG plant cable · Harris County / Greater Houston
We buy LNG plant cable.
LNG work runs on instrumentation: thermocouple extension, shielded pairs, heat trace and the power cable behind them, all of it documented before it leaves the gate.
A liquefaction train is an instrumented process before it is a power system. The cable count is dominated by thermocouple extension, RTD leads, shielded analog pairs and heat trace, with power cable concentrated at the large motor drives and the utility interface. That mix is what surplus from a Gulf Coast LNG site usually looks like.
Houston sits at the centre of this work. Engineering, procurement and module fabrication for the coastal terminals run through the city, and material that is descoped at the drawing stage often ends up in a Houston warehouse rather than on the coast. It is well documented material, and it is rarely dirty when it comes back out of stores.
Instrumentation and thermocouple cable
Thermocouple extension cable is not power cable and should not be described as though it were. It carries a microvolt signal from a junction to a transmitter, so the conductor is a specific alloy matched to the thermocouple type, the pair is shielded, and the jacket colour often codes the calibration. A reel of type K extension is a different asset from a reel of 16 AWG control cable.
The same applies to RTD leads and analog instrument pairs. Shielded, twisted, often with an overall jacket and a drain wire, they are bought on construction and length rather than on copper weight, because the copper in a 20 AWG pair is not the point. A partial reel of 300 feet of a shielded triad can matter to the right buyer.
Instrumentation lots are usually small in weight and large in specificity. Three reels of a shielded triad that a project no longer needs may be worth less than a single partial of 500 MCM, and yet they take longer to describe. That is the nature of the material, and it is why a list matters more here than a photograph.
- Thermocouple extension, type K, J and T
- RTD leads, three and four wire
- Shielded analog pairs and triads, 18 to 24 AWG
- Digital and fieldbus cable on the same racks
- Home-run cable and marshalling panel tails
Heat trace and the rest of the electrical scope
Heat trace is the other signature of a cryogenic plant. Self-regulating and power-limiting trace runs the length of every line that must stay above a set temperature, and it is bought in long reels, cut to the circuit length and terminated on site. Leftover reels are common, and they are almost always new.
Alongside it sits ordinary plant cable: 480 V motor feeders, 5 kV and 15 kV cable to the large drives, tray cable through the racks, and grounding conductor under the equipment. The power side of an LNG site is conventional. What is not conventional is how tightly it is recorded.
Heat trace has its own failure mode. A reel that has been bent tight or walked on develops a fault in the bus wire, and a trace circuit that will not hold its resistance is scrap. Trace that was never installed avoids that entirely, which is why new trace is reviewed differently from trace pulled off a line.
What documentation comes with licensed facility surplus
A security-controlled facility moves material through material management, and the paperwork is the material. A surplus line item carries a description, a quantity, a location and a release reference, and it leaves the gate with a document that matches what is on the truck. A lot presented without that trail is not the same lot.
For a seller this is good news. If the material has already been through the surplus process, the description is likely accurate and the ownership is clear. If it has not, the process has to run first, and starting a review before it does wastes everyone's time and creates a false expectation about when a collection could happen.
Ask who released the material and what document travelled with it. That answers more than the description does.
Sending an LNG or instrumentation list
List by construction rather than by reel. Thermocouple extension, RTD leads, shielded pairs, heat trace, power cable and grounding conductor are six different reviews, and grouping them saves a round of questions. Give the AWG or pair count, the shield type where it is known, the length, and the jacket colour on the thermocouple items.
Photograph the reel tag and the cut end, and include the jacket print where it is legible. Instrumentation cable is usually marked with the calibration, the pair count and the temperature rating, and that print does more than a description ever will. If the reels are still in a warehouse, say whether they have been there since delivery.
Say what the material is not. If a reel of heat trace has been cut, if a thermocouple reel is short of its tag length, or if a power cable has been outside for two years, put it in the note. A conservative description that turns out better than expected is a good outcome for both sides.
- Construction: thermocouple, RTD, pair, triad, heat trace, power
- Size, pair count and shield type where known
- Footage on each reel, or the count of partials
- Jacket colour and print on thermocouple items
- Warehouse location and whether the reels are still banded
Questions sellers ask
Do you buy thermocouple extension cable reels?
Yes, and it is the item most often left over at an LNG or cryogenic site. The calibration type, pair count, shield and remaining length are what matter. A reel with a readable tag and a sound jacket is reviewed on its construction rather than on copper weight.
Can you collect from a security-controlled facility?
Collection follows the facility's own rules: gate lists, escorts, safety orientation and a release document that matches the load. That process is normal and it is not a barrier. It does mean the collection is scheduled rather than arranged on the day.
What matters on a heat trace reel?
Construction first. Self-regulating and power-limiting trace are different products, and both are bought new or unused. Trace that has been installed and removed is graded on the bus wire and the jacket, since a tight bend or a walk-over can fault the circuit.
Do instrumentation lots have to be large?
No. Small, specific lots are common from this work. Three reels of shielded triad with a clear tag is a reasonable review, even though the weight is modest. Power cable and grounding lots are reviewed the same way, at a different scale.
Buying desk · Greater Houston
Have this cable on the yard?
Tell us what is on the reel, where it sits and what condition it is in. A buyer reviews the lot, asks for photographs of the tag and the cut end, and comes back with a real answer — not a request to call a call centre.
- Cable type, size and voltage class
- Footage, reel count or weight, and condition
- City, and whether the site has loading equipment