How to Ship Skid-Mounted Oilfield Equipment: Trailers, Permits & Logistics
Skid-mounted oilfield equipment — hydraulic power units (HPUs), production separators, pump skids, compressor skids, and wellhead control panels — is designed for mobility but still requires careful logistics planning for over-road transport. Skid units vary enormously in size and weight, from small HPUs under 10,000 lbs to large production separators exceeding 100,000 lbs. IronHaul Logistics moves oilfield skid equipment nationwide, coordinating permits, trailer selection, and crane or forklift loading as needed.
Types of Skid-Mounted Oilfield Equipment
The term "skid-mounted" covers a wide range of oilfield and industrial equipment built on a structural steel base frame (the skid) for easy transport and installation. Common types include:
- Hydraulic Power Units (HPUs): Diesel or electric-powered hydraulic systems used to operate wellhead equipment, BOPs, and other hydraulic machinery. Typically 8,000–30,000 lbs, 10–20 ft long.
- Production Separators: Pressure vessels that separate oil, gas, and water from wellbore production. Can range from 15,000 lbs for a small two-phase separator to 80,000+ lbs for a large three-phase unit.
- Pump Skids: Centrifugal or positive displacement pumps on a skid frame. Typically 5,000–40,000 lbs depending on pump size and driver (electric motor vs. diesel engine).
- Compressor Skids: Natural gas or air compressors on a skid frame. Small units run 10,000–30,000 lbs; large reciprocating compressor skids can exceed 100,000 lbs.
- Wellhead Control Panels: Pneumatic or hydraulic control systems for wellhead valves. Typically small — 2,000–8,000 lbs — and ship on a flatbed or step deck.
Typical Dimensions and Weight Ranges
| Equipment Type | Typical Weight | Typical Length | Typical Width |
|---|---|---|---|
| Small HPU | 8,000–15,000 lbs | 10–14 ft | 6–8 ft |
| Large HPU | 15,000–30,000 lbs | 14–20 ft | 7–9 ft |
| Production Separator (small) | 15,000–40,000 lbs | 15–25 ft | 6–10 ft |
| Production Separator (large) | 40,000–100,000+ lbs | 25–50 ft | 8–14 ft |
| Compressor Skid (small) | 10,000–30,000 lbs | 12–20 ft | 6–8 ft |
| Compressor Skid (large) | 30,000–100,000+ lbs | 20–50 ft | 8–14 ft |
Trailer Selection
Trailer selection depends on the skid's weight, dimensions, and whether it has forklift pockets or lifting eyes for loading.
- Flatbed (48–53 ft): Suitable for skid units under 8.5 ft wide, under 8.5 ft tall (including the skid height), and under 48,000 lbs. Most small HPUs and wellhead control panels ship on flatbeds. Loading is typically done with a forklift using the skid's forklift pockets.
- Step Deck: Adds height clearance for taller skid units. Suitable for equipment 9–10.5 ft tall and under 48,000 lbs. Common for mid-size HPUs and pump skids with tall motor/engine configurations.
- Lowboy: For heavy skid units 10–12 ft tall and up to 80,000 lbs. Common for large compressor skids and production separators. Loading typically requires a crane or heavy forklift.
- RGN: For the heaviest skid units over 80,000 lbs or those requiring ground-level loading. Multi-axle RGN configurations can handle 150,000+ lbs.
Loading Skid-Mounted Equipment
Most skid units are loaded using one of three methods:
- Forklift loading: The most common method for skids with forklift pockets. The forklift must be rated for the full weight of the skid. Use only the designated forklift tubes — never lift from the equipment frame, piping, or electrical conduit. Center of gravity may shift if the unit contains hydraulic fluid or fuel.
- Crane loading: Required for skids without forklift pockets or those too heavy for available forklifts. Lifting points (lift eyes or spreader bar attachment points) must be rated for the full skid weight. A rigging plan should be prepared before lifting.
- Skidding/pulling: Some skid units can be pulled onto a lowboy or RGN using a winch. This method requires a level loading surface and careful alignment.
Permit Requirements
Small skid units that fit within legal dimensions (under 8.5 ft wide, 13.5 ft tall, 80,000 lbs GVW) ship without oversize permits. Larger units require state-specific oversize/overweight permits for every state traversed. Wide production separators and large compressor skids often require pilot cars and may require engineering review for super loads over 150,000 lbs. Permit processing time ranges from same-day to 10+ business days for super loads.
Fluid and Safety Preparation
Before transport, all fluid levels should be assessed. HPUs and compressor skids may be transported with hydraulic oil and fuel in their reservoirs — check manufacturer specifications. All external connections (hose ends, pipe flanges, electrical conduit) should be capped or plugged to prevent contamination and damage. Pressure vessels (separators) must be depressurized and purged before transport. Secure all loose components, instrumentation, and valves against vibration damage during transit.
IronHaul Logistics moves oilfield skid equipment from wellsites, fabrication yards, and service facilities nationwide. Our team handles permitting, crane coordination, and trailer matching for every load. Request a free quote at ironhaullogistics.com, call (208) 495-2260, or email [email protected].
Common questions
What trailer is used to ship a hydraulic power unit (HPU)?
Small HPUs (under 8.5 ft wide, under 8.5 ft tall, under 48,000 lbs) typically ship on a flatbed trailer using forklift loading. Larger HPUs may require a step deck or lowboy depending on height and weight. The carrier will confirm trailer type based on your unit's exact dimensions.
Can skid-mounted equipment be shipped with fluids in the reservoirs?
Many HPUs and compressor skids are designed to be transported with hydraulic oil and fuel in their reservoirs. However, you should verify with the manufacturer's documentation. Pressure vessels (separators) must be depressurized and purged before transport.
How do you load a skid unit onto a flatbed trailer?
Most skid units are loaded with a forklift using the skid's designated forklift pockets. The forklift must be rated for the full weight of the skid. For skids without forklift pockets, crane loading using lift eyes or a spreader bar is required.
Do skid-mounted oilfield units require oversize permits?
It depends on the dimensions. Small skid units within legal limits (under 8.5 ft wide, 13.5 ft tall, 80,000 lbs GVW) ship without oversize permits. Larger production separators, compressor skids, and HPUs often exceed these limits and require state-specific permits.
How much does it cost to ship a skid-mounted oilfield unit?
Cost depends on the skid's dimensions, weight, and distance. Small HPUs on a flatbed might cost $800–$2,500 for regional moves. Large compressor skids or production separators requiring lowboy or RGN trailers and oversize permits can cost $3,000–$15,000+ for cross-country moves. Contact IronHaul for a precise quote.
Ready to move a machine?
Tell us what you're shipping and where. We quote direct — no bidding wars, no load-board runaround.