Hydrovac Truck Specifications: Compare Models and Configurations
Technical specifications, typical ranges, and selection guidance.
Hydrovac truck specifications determine what the truck can do, how long it can work between service stops, and how much it costs to operate. Understanding the key specifications — and how they interact with each other — is essential for selecting a truck that matches your operating requirements without paying for capability you do not need.
The most important specifications to evaluate are debris tank capacity, water tank capacity, vacuum system performance (CFM and inches of mercury), water pump output (PSI and GPM), boom reach and rotation, boiler BTU rating, and chassis gross vehicle weight rating (GVWR). These specifications are interdependent: a larger debris tank adds weight, which may require a heavier chassis, which costs more fuel to operate. Finding the right balance is what equipment selection is about.
Debris Tank
| Specification | Typical Range | Description |
|---|---|---|
| Capacity | 6–16 cubic yards | Volume of excavated material the tank can hold. Larger tanks reduce dump trips but add weight. Common sizes: 8 CY (compact), 10-12 CY (mid-size), 15-16 CY (industrial). |
| Material | Carbon steel, stainless steel, or aluminum | Carbon steel is most common and affordable. Stainless steel resists corrosion for remediation work. Aluminum reduces weight but costs more and is less durable against abrasion. |
| Discharge Type | Full-opening rear door, tip-out, or pressure-off | Full-opening rear doors allow easy cleanout. Tip-out (tilting tank) enables complete material discharge. Pressure-off uses compressed air to push material out. |
| Tare Weight (empty) | 3,000–8,000 lbs (tank only) | Empty tank weight varies by size and material. Factor tank weight into total truck GVWR calculations to determine available payload for debris. |
Water Tank
| Specification | Typical Range | Description |
|---|---|---|
| Capacity | 400–1,500 gallons | Water storage volume. Compact units carry 400-600 gallons. Standard trucks carry 800-1,200 gallons. Large industrial units carry 1,200-1,500 gallons. Capacity determines work time before refill. |
| Material | Polyethylene, aluminum, or carbon steel | Polyethylene tanks are lightweight and corrosion-resistant. Aluminum offers strength with weight savings. Steel is durable but adds significant weight. |
| Fill Connection | 2-inch or 2.5-inch NH/NST | Standard fire hydrant compatible fill connections allow rapid refill from municipal water sources. Some trucks include onboard fill pumps for non-pressurized water sources. |
Vacuum System
| Specification | Typical Range | Description |
|---|---|---|
| Blower Type | Positive Displacement (PD) or Centrifugal Fan | PD blowers maintain consistent vacuum regardless of airflow restriction — preferred for hydrovac. Fan systems offer higher airflow but vacuum drops under load. PD is standard for professional hydrovac trucks. |
| CFM (Cubic Feet per Minute) | 2,500–6,500 CFM | Airflow volume determines how quickly material moves from the excavation to the debris tank. Higher CFM means faster material removal. 3,000-5,000 CFM is typical for mid-size trucks. |
| Vacuum Rating (inches Hg) | 15–28 inches Hg | Maximum vacuum level indicates suction power for lifting heavy, wet material. PD blowers typically achieve 25-28 Hg. Higher Hg is important for deep excavation and heavy clay or saturated soil. |
| Filtration | Cyclone separator, baghouse, or combination | Filtration prevents debris from reaching the blower. Cyclone separators are standard. Baghouse filters provide additional fine particle protection. Multi-stage systems combine both. |
Water Pump
| Specification | Typical Range | Description |
|---|---|---|
| Maximum PSI | 1,000–4,000 PSI | Maximum water pressure capability. Most hydrovac work uses 1,500-3,000 PSI. Variable pressure control is essential for adjusting to soil conditions and utility proximity. |
| Flow Rate (GPM) | 5–18 GPM | Water volume delivered per minute. Higher GPM excavates faster but consumes water more quickly. Typical hydrovac operation uses 8-12 GPM. GPM and PSI are inversely related at maximum pump output. |
| Pump Type | Triplex plunger pump | Triplex (3-plunger) positive displacement pumps are the industry standard. Ceramic plungers last longer than steel in continuous-duty applications. Pump drive is typically hydraulic motor. |
Boom
| Specification | Typical Range | Description |
|---|---|---|
| Reach | 8–27 feet | Maximum horizontal distance from the boom pivot to the boom tip. Longer reach allows excavation further from the truck. Common: 18 ft (compact), 24 ft (standard), 26-27 ft (extended). |
| Rotation | 270°–340°+ | Arc of boom rotation around the truck. Full 340°+ rotation provides maximum job site flexibility. Limited rotation (270°) restricts working positions. |
| Vacuum Hose Diameter | 6-inch or 8-inch | 6-inch hose is standard on compact and mid-size trucks. 8-inch hose provides faster material flow on large industrial units. Hose diameter must match blower capability. |
Boiler/Heater
| Specification | Typical Range | Description |
|---|---|---|
| BTU Output | 200,000–800,000 BTU | Heat energy output for warming excavation water. 200-400K BTU for mild winters. 600-800K BTU for sustained sub-zero operations. Higher BTU enables faster water temperature recovery. |
| Temperature Rise | 70°F–130°F above inlet | How much the boiler raises water temperature above the inlet temperature. At 40°F inlet water, a good boiler produces 140-170°F outlet temperature for frozen ground excavation. |
| Recovery Rate | 5–15 GPM at rated temperature rise | How quickly the boiler can heat water to operating temperature. Higher recovery rates sustain continuous excavation without waiting for water to reheat. |
Chassis
| Specification | Typical Range | Description |
|---|---|---|
| GVWR | 33,000–66,000 lbs | Maximum legal loaded weight of the complete vehicle. Determines how much payload (debris + water) the truck can carry legally. Must comply with bridge law for your operating region. |
| Axle Configuration | Single rear, tandem rear, or tridem | Single rear axle: compact, maneuverable, lower payload. Tandem: standard for most hydrovac trucks, good payload capacity. Tridem: maximum payload for large industrial units. |
| Wheelbase | 180–280+ inches | Distance between front and rear axles. Shorter wheelbase improves maneuverability. Longer wheelbase provides more mounting space for larger tanks. Match to your typical work environment. |
| Common Chassis Brands | Peterbilt, Kenworth, Western Star, Freightliner, International | Chassis brand affects cab comfort, dealer support, resale value, and serviceability. Most hydrovac manufacturers offer builds on multiple chassis brands. |
Key Considerations
- 1.Total payload capacity (GVWR minus empty truck weight) determines how much debris and water you can carry — this is your effective working capacity.
- 2.Debris tank capacity in cubic yards does not directly equal payload weight. Saturated material can weigh 50% more per cubic yard than dry soil.
- 3.Bridge law compliance varies by state and province. A truck that is legal in one jurisdiction may exceed weight limits in another. Check axle spacing requirements.
- 4.Larger is not always better. A 16-CY truck that exceeds weight limits before filling the tank wastes capacity. Match tank size to your legal payload.
- 5.Boom reach versus truck wheelbase is a trade-off. Longer booms provide more reach but add weight and reduce maneuverability on the chassis.
- 6.Water consumption determines how often you need to refill. A 1,200-gallon tank at 10 GPM provides about 2 hours of continuous excavation before refill.
- 7.Resale value varies significantly by manufacturer, chassis brand, and configuration. Consider residual value as part of your total cost of ownership calculation.
Related Buyers Guide Categories
Frequently Asked Questions
What is the most popular hydrovac truck configuration?
The most common configuration is a 10-12 cubic yard debris tank with a 1,000-1,200 gallon water tank on a tandem rear axle chassis (56,000-66,000 GVWR). This mid-size configuration balances payload capacity with maneuverability and fits the widest range of applications from utility potholing to pipeline work.
How much does a fully loaded hydrovac truck weigh?
A fully loaded mid-size hydrovac truck (10-12 CY debris tank, 1,000 gallon water tank) weighs 55,000-66,000 lbs depending on chassis, equipment, and material density. The empty truck typically weighs 30,000-38,000 lbs, leaving 18,000-28,000 lbs of available payload for debris and water.
PD blower or fan system — which is better for hydrovac?
Positive Displacement (PD) blowers are strongly preferred for professional hydrovac operations. PD blowers maintain consistent vacuum regardless of airflow restriction, which is essential when moving heavy, wet soil through long hose runs. Fan systems lose vacuum as restriction increases. PD blowers are more expensive and louder, but their performance advantage is significant for hydrovac work.
