Reduces ignition risk
Supports safer handling by allowing static charge to drain off to grounded vessel or piping surfaces before transfer into vapor-space areas.
Static DissipationProvides product residence time after filtration so charge can relax before transfer.
Space SavingReduces the need for long lengths of dedicated relaxation piping.
ASME VesselsDesigned as documented vertical pressure vessels for demanding hydrocarbon service.
Application BasedSized around product, flow, pressure and operating conditions.
Why relaxation time matters.
Liquid hydrocarbons develop static electrical charge as they move through pipelines, valves, meters and especially filtration equipment. Because filters contain millions of tiny pores, they are one of the strongest static generators in a fuel handling system. After filtration, product should remain in grounded piping or a relaxation tank long enough for the initial charge to decay before it enters a tank or vessel with vapor space.
Built for safe transfer.
Lemico relaxation tanks are engineered to provide approximately 30 seconds of system relaxation time for safe downstream handling. Vertical vessel designs help save layout space while supporting pressure, flow and operational requirements for the application.
Key Benefits
Purpose-built relaxation tanks improve safety and simplify piping layouts in filtration and transfer systems.
Compact vertical design
Saves valuable site area compared with hundreds or thousands of feet of dedicated relaxation pipe.
Flow-specific sizing
Volume and geometry can be matched to required residence time, product conductivity and operating conditions.
Pressure vessel construction
Configured as vertical pressure vessels with documented fabrication suitable for hydrocarbon service.
Optional accessories
Connections for air eliminators, safety valves, drains and optional manways can be incorporated as required.
Application flexibility
Suitable anywhere filtered hydrocarbon product needs controlled relaxation time before storage or dispensing.
Standard Model Reference
Reference sizes are shown below. Final dimensions and details are issued with engineering drawings and should not be used for pre-piping work.
| Model | Volume (USG) | A | B | C | D | E | F | G | H | J | K | L | M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RT-200 | 100 | 24 | 69 | 32 | 18 | 16 | 3 | 4 | 7/8 | 1 | 28 | 6 | 75 |
| RT-350 | 175 | 28 | 84 | 38 | 20 | 18 | 4 | 4 | 7/8 | 1 | 32 | 8 | 94 |
| RT-400 | 200 | 30 | 86 | 40 | 21 | 20 | 4 | 4 | 7/8 | 1 | 34 | 8 | 96 |
| RT-500 | 250 | 32 | 94 | 42 | 22 | 22 | 6 | 4 | 7/8 | 1 | 36 | 8 | 105 |
| RT-600 | 300 | 36 | 91 | 46 | 24 | 24 | 6 | 5 | 7/8 | 1.5 | 40 | 8 | 104 |
| RT-800 | 400 | 40 | 90 | 52 | 24 | 26 | 6 | 5 | 7/8 | 1.5 | 42 | 8 | 104 |
| RT-1000 | 500 | 42 | 98 | 54 | 24 | 28 | 8 | 5 | 7/8 | 1.5 | 44 | 10 | 110 |
| RT-1200 | 600 | 48 | 98 | 60 | 25 | 32 | 8 | 6 | 7/8 | 2 | 48 | 10 | 112 |
| RT-1800 | 900 | 54 | 122 | 66 | 30 | 36 | 10 | 6 | 1 | 2 | 54 | 10 | 140 |
| RT-2400 | 1200 | 60 | 128 | 72 | 31 | 41 | 10 | 6 | 1 | 2 | 60 | 10 | 146 |
| RT-3000 | 1500 | 66 | 136 | 78 | 34 | 45 | 12 | 6 | 1 | 2 | 66 | 12 | 156 |
Notes: Specifications and sizes can change without prior notice. Reference only. Not to scale. Accurate dimensions and details will be issued with engineering drawings.
Typical Design Considerations
Relaxation tank sizing and layout depend on the fuel, filtration stage and downstream handling method.
Product conductivity
Relaxation time depends on the conductivity or resistivity of the liquid hydrocarbon being handled.
System flow rate
Required tank volume is matched to flow so the target residence time is maintained under operating conditions.
Downstream destination
Use is especially important before open tanks or any vessel with vapor space where ignition risk must be tightly controlled.
Accessory layout
Air eliminator connections, safety valve connections, drains and optional manway arrangements are reviewed during design.
Footprint and access
Vertical layouts help reduce plot-space demand while still allowing practical inspection and service access.
Project documentation
Fabrication can be supplied with the documentation package required for quality review and installation planning.
Need help sizing a relaxation tank?
Send us your product, flow rate, pressure and downstream application details and we can review the right vessel configuration.