Generators move with a pipeline spread on trailers, towed behind a truck and set at each crew’s work position, then relocated as that crew advances along the right-of-way. Some crews leapfrog two units, running one while the other is moved ahead, and other crews keep a single unit that follows the work face. The right pattern depends on the crew’s load, how often it moves and how the rental terms are written. Matching those three factors keeps power available at the work face without paying for units that sit idle.
Stag Power Rentals supplies diesel generators from a yard in Dickinson, TX, with a fleet that runs from 20 kW to 2000 kW and billing by single, double or triple shift. This article covers how units travel with the crews, which crews need them and how to plan relocations. Fueling a moving site is a separate topic, covered in the fuel plan for linear projects, so it is only touched on here.
Electrical safety rules apply on a moving site just as they do on a fixed one. OSHA’s 1926.404(b)(1) requires approved ground-fault circuit interrupters on 120-volt, single-phase, 15- and 20-ampere temporary receptacle outlets in use by employees, or an assured equipment grounding conductor program as the alternative. The rule also lists an exception for small portable generators, so confirm the details with your safety lead before relying on it. Each relocation resets cords and connections, which makes that check a routine part of every move.
What a spread looks like
A pipeline spread is the line of crews that advances along the right-of-way, commonly including clearing and grading, trenching, stringing, welding, coating, lowering-in and backfill. Composition varies by project, contract and terrain, so that list is a starting point rather than a template. Each crew works at its own position and moves on its own schedule. Generator support has to be planned crew by crew instead of as one fleet that moves in a block.
Which crews need generator power
Power need depends on what each crew runs, and many crews on a spread use self-powered equipment that needs no generator at all. The table below shows typical patterns, and the final loads should come from each crew’s own equipment list. Motors draw more at startup than while running, so the construction site generator sizing guide is the place to total them. Treat the entries as starting points, since methods and contract requirements differ by project. Crossings drilled by directional drilling have their own power questions, covered in the article on what powers a directional drilling crossing.
| Crew | Typical power need | How the generator moves |
|---|---|---|
| Clearing and grading | Often none, or temporary lighting and small tools | Usually no dedicated unit; a shared unit may ride with a support truck |
| Trenching | Limited, depending on the equipment in use | Rarely has its own unit; one follows if lighting or tools are electric |
| Stringing | Light, such as lighting and handheld tools | Small trailer unit towed along the string |
| Welding | Supplemental lighting and tools; welding rigs are covered on a separate page | Trailer unit stays near the weld stations and advances with them |
| Coating and field joints | Moderate; may include heaters, lighting and tools depending on the method | Trailer unit moves with the crew, often leapfrogged |
| Lowering-in | Lighting and tools, sometimes for low-visibility work | Trailer unit or lighting set follows the crew |
| Backfill and cleanup | Light | Small or shared unit moves when the crew does |
| Staging yard, office or camp | Steady and larger, running for long periods | Stationary unit that relocates only when the yard does |
The pattern is that crews at the work face carry lighter, more mobile loads, while stationary locations carry the heaviest steady demand. Welding gets only a brief note here because welding rigs and inspection gear are planned for their own page. The loads for those machines are covered in the article on powering welding rigs and inspection gear. Where one unit feeds several loads, the power distribution page explains how the output can be split. Sizing each unit to its crew also keeps trailers manageable enough to move often.
Leapfrog or follow the work face
Leapfrogging means two units serve one crew, with the crew working from one while the other is moved ahead to the next position. Following the work face means a single unit is shut down, towed and reset each time the crew advances. Leapfrogging suits crews that move often and cannot lose power during working hours. Following suits crews with a natural pause at each move or loads that can wait a short time. The choice changes how many units you need, so settle it before the rental terms are written.
Trailers and tow vehicles
Trailer-mounted diesel units are the usual choice for a moving spread because they hitch to a truck and can be repositioned without a crane. Options are described on the towable diesel generator rental page. The tow vehicle must be rated for the trailer, and weights and hitch types vary by unit, so confirm them with the rental provider before mobilizing. Soft or rutted ground on the right-of-way can limit where a trailer can travel, so check the route with the grading crew. Assigning a tow vehicle and driver to each unit keeps relocation from depending on borrowing a truck from another crew.
A relocation routine
A written routine keeps each move short and consistent when several crews are advancing in the same week. The steps below fit a leapfrog arrangement, and a single-unit crew can use the same order with a planned pause in step three. Adjust the sequence to your site rules, the manufacturer’s instructions and your safety plan. Assign one person per crew to own the checklist so that no step is skipped when the crew is busy.
- Confirm the crew’s next position with the superintendent and walk the tow path for obstacles.
- Bring the leapfrog or backup unit to the new position first, if one is assigned.
- Move the crew’s loads to the new unit and confirm that tools and lighting run normally.
- Shut down the old unit, allow it to cool as the manufacturer directs, then disconnect and coil the cables.
- Inspect the trailer hitch, lights, tires and chains before towing.
- Tow the unit at a pace suited to the right-of-way, then level it and chock it at the next position.
- Check the cords, distribution and ground-fault protection, then note the hours and fuel level for whoever manages fuel.
Mobilization, demobilization and rental terms
Mobilization and demobilization cover the cost and timing of getting each unit to the first position and back to the yard at the end. Both depend on the location, the unit size and the contract, so ask for them as separate lines in the quote. The generator rental pricing guide explains how rental pricing is built. Because Stag bills by single, double or triple shift, a crew that works one shift a day can be matched to a single-shift term, while a crew running nights too may need a different one. Ask how terms apply when a crew pauses for weather or a hold on the line, since treatment varies by contract.
Keeping a backup unit
A backup unit protects the crews whose loads cannot wait, such as lowering-in under a tight window. It can also serve as the leapfrog unit for a crew that moves often. Decide which crews justify one and which can share, because a backup sitting at the yard does nothing for a crew stalled at the work face.
Coordination across crews
A spread works only when crews advance in order, so generator moves need to be scheduled alongside the crew moves. Hold a short planning call each day or week, depending on the pace of the spread, so each crew knows when its unit relocates. Name one point of contact for generator questions and one for fuel. When a crew changes equipment mid-job, send the updated load list to the rental provider so the unit can be resized rather than overloaded.
Planning generator support for your spread
If you are laying out generator support for a pipeline spread, start with the crew list, the loads each crew runs and how often each one moves. Stag Power Rentals can discuss unit sizes from 20 kW to 2000 kW, trailer options and shift-based billing against that plan from its Dickinson, TX yard. For the wider picture, see the construction industry overview. When the crew list and load estimates are ready, send them through the quote request form.
Frequently Asked Questions
Does every crew on a pipeline spread need a generator?
Not necessarily, because many crews run self-powered equipment. Crews with lighting, handheld electric tools or other electric loads are the ones that need a unit. Spread composition varies by project, so review each crew’s equipment list before deciding. Staging yards and camps usually need a stationary unit even when work-face crews do not.
Can a generator be towed between positions on the right-of-way?
Yes, trailer-mounted units are built for that purpose. The tow vehicle, hitch and trailer weight need to match, and ground conditions on the right-of-way can limit the route. Confirm these details with the rental provider before mobilizing. A walk of the tow path before each move helps avoid surprises.
How many generators does a pipeline spread need?
The number depends on how many crews have electric loads, how often they move and whether you use leapfrog units. There is no standard count that fits every spread. Start with a crew-by-crew load list and decide where leapfrogging or a shared backup makes sense. A rental provider can help turn that list into a unit plan.
How should rental terms match the pace of the spread?
Billing by single, double or triple shift lets you match the term to the hours each crew works. A crew on one shift can be set up differently from a crew that works nights. Ask how pauses for weather or line holds are treated, since this varies by contract. Review the pricing guide and request a quote with your expected shift pattern.
What happens to the generator when a crew falls behind or moves ahead of schedule?
The relocation schedule should follow the crew, not the original plan. Daily or weekly coordination lets the unit be moved earlier or held in place without surprises. A backup or leapfrog unit makes schedule changes easier to absorb. Tell the rental provider about major changes so terms and unit sizes can be reviewed.