Equipment Specifications
Condensate & Sludge Management Systems
Sediment traps, drip traps, P-trap moisture separators, stormwater removal systems, sludge draw-off piping, access hatches, and HDPE pipe pressure ratings for covered lagoon digesters.
Material Properties & Ratings
Key material properties, pressure ratings, and dimensional specifications for condensate management components and HDPE biogas piping.
| Property | Unit | Value | Standard |
|---|---|---|---|
| Sediment Trap Construction | - | Welded steel, hot-dipped galvanized | - |
| Rated Gas Capacity | cu ft/hr | 82,700 | - |
| Sediment Capacity | gallons | 6 | - |
| Condensate Capacity | gallons | 6 | - |
| PE Pipe Material | - | HDPE (Performance Pipe M&I Series) | PPI TR-7 |
| PE Pipe DR 7.3 Pressure | PSI @ 73F | 255 | PPI TR-7 |
| PE Pipe DR 9.0 Pressure | PSI @ 73F | 200 | PPI TR-7 |
| PE Pipe DR 11.0 Pressure | PSI @ 73F | 160 | PPI TR-7 |
| PE Pipe DR 13.5 Pressure | PSI @ 73F | 130 | PPI TR-7 |
| PE Pipe DR 17.0 Pressure | PSI @ 73F | 100 | PPI TR-7 |
| PE Pipe DR 21.0 Pressure | PSI @ 73F | 80 | PPI TR-7 |
| PE Pipe DR 26.0 Pressure | PSI @ 73F | 65 | PPI TR-7 |
| PE Pipe DR 32.5 Pressure | PSI @ 73F | 50 | PPI TR-7 |
| Access Hatch Min. Size | ft | 1.5 dia or 1.5 x 1.5 | - |
| Sample Port Size | inches | 6 | - |
| Sump Spacing (Impermeable) | ft | 50 max. | - |
Key Features
Integrated condensate, stormwater, and sludge management for covered lagoon digester systems.
Varec Model 233 sediment/condensate trap — 82,700 cu ft/hr rated
Rotating disc drip traps at all piping low points — gas-sealed during drainage
P-trap moisture separators to prevent biogas venting
Automatic timer-controlled drip trap option (Varec 246 AT)
Submersible stormwater pump systems with 50 ft max sump spacing
Self-draining permeable cover option eliminates pump infrastructure
Sludge draw-off pipes across entire digester floor
Minimum 10 access hatches with gas seals (1.5 ft min.)
Minimum 6 sample ports (6 inch) for wastewater/sludge sampling
Minimum 3 manway hatches along lagoon center
HDPE gas piping in 4-12 inch sizes per PPI TR-7
Thickened sludge fluidization technique for difficult removals
Applications
Condensate and sludge management systems for lagoon-based anaerobic digestion and biogas handling.
Covered lagoon anaerobic digester condensate management
Biogas piping moisture control for flare and RNG systems
Impermeable cover stormwater removal
Reservoir cover rainwater management
Lagoon sludge removal and solids handling
Agricultural and industrial wastewater treatment lagoons
Equipment Specifications
Detailed equipment and component specifications for condensate, stormwater, and sludge management systems.
| Component | Specification |
|---|---|
| Sediment/Condensate Trap | Varec Model 233, welded steel, hot-dipped galvanized |
| Trap Rated Capacity | 82,700 cu ft/hr biogas |
| Trap Storage | 6 gal sediment + 6 gal condensate |
| Drip Traps | Varec Figure No. 246, rotating disc, all low points |
| Auto Drip Trap | Varec Model 246 AT with timer control |
| Moisture Separators | P-trap type, must remain full of water |
| Stormwater Pumps (Impermeable) | Submersible, automatic, 50 ft max sump spacing |
| Stormwater (Permeable) | Self-draining through cover fabric |
| Sludge Draw-Off | Pipes across entire floor, terminated at berm for pump connection |
| Access Hatches | Min. 10, 1.5 ft dia or 1.5 x 1.5 ft, gas-sealed |
| Sample Ports | Min. 6, 6 inch, gas-sealed |
| Manway Hatches | Min. 3, along/near lagoon center, gas-sealed |
| PE Pipe Material | HDPE, Performance Pipe M&I Series, PPI TR-7 |
| PE Pipe Sizes | 4, 6, 8, 10, 12 inch |
| PE Pipe Pressure Range | 50 PSI (DR 32.5) to 255 PSI (DR 7.3) at 73F |
Frequently Asked Questions
Why is condensate management critical for covered lagoon systems?
Biogas produced in covered lagoons is saturated with moisture that condenses in collection piping as it cools. Without continuous condensate removal, piping blockages can disrupt gas flow to flares or energy equipment, cause dangerous pressure buildup under the cover, and lead to equipment corrosion. Proper condensate management ensures reliable, uninterrupted biogas handling.
How do the drip traps prevent gas escape during condensate removal?
EFI uses Varec rotating disc drip traps (Figure No. 246) placed at all low points in the biogas piping system. The design ensures that when the gas connection is open, the drain is automatically closed, and vice versa. This prevents biogas from escaping to atmosphere during condensate removal. Timer-controlled automatic models (Model 246 AT) are also available.
How does sludge removal work under a floating cover?
Draw-off pipes installed across the entire digester floor connect to the berm for high-solids pump attachment. For standard sludge, connect the pump suction and withdraw. If sludge is too thick to pump, reverse the system: pump low-solids water from the upper zone into the draw-off pipe to fluidize the thickened sludge, then reverse and withdraw. Sludge is typically applied to cropland at agronomic rates.
What maintenance do P-traps require?
P-traps (moisture separators) must remain full of water at all times. A low water level allows biogas to vent through the drain line to atmosphere. Daily checks should verify that P-trap valves are open and the moisture separator is filled with water and overflowing. This is one of the most critical daily maintenance items for covered lagoon systems.
What PE pipe sizes are used for biogas piping?
Common gas piping sizes are 4, 6, 8, 10, and 12 inch HDPE (Performance Pipe Municipal & Industrial Series per PPI TR-7). Pressure ratings at 73F range from 50 PSI (DR 32.5) to 255 PSI (DR 7.3). Note that ratings are for water at 73.4F — for biogas and other fluids at different temperatures, ratings may differ.
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