The ALMCO ST-4-100 is a larger-capacity four-stage sediment tank engineered for higher fluid volumes and production environments requiring enhanced process fluid management. Its cascading design promotes efficient settling of suspended solids prior to filtration, discharge, or recirculation.
Sediment Tanks
ST-4-100 Four-Stage Sediment Tank
OVERVIEW
ST-4-50 System Overview
The ALMCO ST-4-100 is designed for manufacturers processing larger volumes of water-based finishing fluids. Utilizing the same proven four-stage sedimentation design as the ST-4-50, the larger tank capacity increases settling volume and retention time, helping improve solids removal before fluid leaves the system.
Process fluid enters the tank and passes through four cascading compartments formed by internal stainless-steel baffles. As liquid moves through each chamber, suspended solids gradually settle to the bottom of the tank while cleaner liquid advances toward the outlet.
The ST-4-100 is constructed from heavy-duty 304 stainless steel using all-welded construction for durability and corrosion resistance. Its larger capacity makes it particularly well suited for high-production finishing operations where fluid volumes exceed the practical limits of smaller settling systems.
For applications requiring enhanced fluid management, the ST-4-100 can be configured with optional transfer pumps, bag filtration systems, Hydrominder solution controls, oil removal equipment, and fluid recirculation packages.
KEY ADVANTAGES
- Four-stage cascading sedimentation design
- 100-gallon capacity
- Heavy-duty 304 stainless steel construction
- Increased settling volume for higher production rates
- Supports filtration and fluid-recovery systems
- Configurable for discharge or fluid reuse applications
COMMON APPLICATIONS
- Vibratory bowl finishing systems
- Vibratory tub finishing systems
- Spindle finishing equipment
- Deburring and burnishing operations
- Process fluid clarification
- Wastewater pre-treatment
TECHNICAL SPECIFICATIONS
| Specification | ST-4-100 |
|---|---|
| Tank Capacity (Gal) | 100 |
| Tank Measurements (In) | 60 L x 40 W x 13 H |
| Overall Measurements (In) | 78-1/4 x 40-1/4 x 46 |
| Optional Transfer Pump | 2 HP, three-phase pump |
| Voltage | 230v or 460v, 3 Phase |
| Sedimentation Stages | 4 |
| Construction | 304 Stainless Steel |
| Internal Baffles | 3 |
| Fluid Flow | Gravity Cascade |
| Filtration Option | 8″ diameter by 30″, 50 micron bag filter |
| Hydrominder | Optional |
SYSTEM DETAILS
Baffles
Tank Construction
The tank is fabricated from 304 stainless steel using all-welded construction. The inside of the tank includes three parallel baffles that create four cascading tank compartments. Fluid entering the tank cascades from compartment to compartment, allowing solids to settle out of the liquid.
FREQUENTLY ASKED QUESTIONS
What does a settling tank do?
A settling tank removes suspended solids from water-based process fluids through gravity separation. As fluid flows through multiple compartments, heavier particles settle to the bottom of the tank while cleaner liquid exits the system for discharge, filtration, or reuse.
What types of equipment can be connected to an ST-Series settling tank?
ST-Series settling tanks are commonly used with:
- Vibratory bowl finishers
- Vibratory tubs
- Centrifugal barrel systems
- Spindle finishing machines
- Burnishing systems
- Parts washing equipment
- Other metal finishing processes using water-based compounds
What contaminants can an ST-Series tank remove?
The settling process is effective for removing:
- Metal fines
- Abrasive media particles
- Grinding residue
- Deburring sludge
- Scale and particulate
- Other settleable solids
The tank is designed for solids removal and is often paired with filtration or oil removal systems when additional fluid treatment is required.
What is the advantage of a four-stage settling tank?
The four-stage design increases fluid retention time and allows solids to settle progressively as fluid moves through each compartment. This helps improve clarification efficiency compared to a single-compartment tank.
Can the fluid be reused after passing through the settling tank?
Yes. Many customers use ST-Series tanks as part of a fluid recirculation system. Optional pumps, filtration systems, and fluid-management equipment can be added to support reuse of process water and compounds.
How are the tanks cleaned out?
ALMCO provides threaded fittings on the rinse and collection tanks. These are ready for drain valves or piping from tank drain fittings to your wastewater collection system. There is also access doors on the tanks to allow for cleanout.
Is filtration included with the ST-4-50 or ST-4-100?
Filtration is available as an option. ALMCO can supply bag filtration systems, pumps, and other fluid-management equipment based on your specific application requirements.
Can oil be removed from the fluid?
Yes. Optional oil skimmers and coalescers can be added to help remove tramp oils and extend the life of the process solution.
What is the difference between the ST-4-50 and ST-4-100?
The primary difference is tank capacity.
- ST-4-50: 50-gallon capacity for smaller systems and individual machines.
- ST-4-100: 100-gallon capacity for higher flow rates, larger machines, and centralized fluid-management applications.
Both models utilize the same four-stage sedimentation design and stainless-steel construction.
What are the tanks constructed from?
Both ST-Series models are fabricated from durable 304 stainless steel using all-welded construction for long-term corrosion resistance and industrial durability.
How often does a settling tank need to be cleaned?
Cleaning frequency depends on the volume of solids entering the tank and the type of process being used. High-production finishing operations may require periodic sludge removal, while lighter-duty applications may require less frequent maintenance.
Can the ST-Series be customized?
Yes. ALMCO can configure ST-Series tanks with:
- Transfer pumps
- Bag filtration systems
- Hydrominder systems
- Oil skimmers
- Oil coalescers
- Custom plumbing
- Fluid recirculation systems
- Automated controls
Why use a settling tank instead of filtration alone?
Settling tanks remove a significant portion of larger solids before the fluid reaches a filter. This can reduce filter loading, extend filter life, lower maintenance costs, and improve overall fluid-management performance.
OPTIONS & UPGRADES
Bag Filter
The bag filter housing is an 8” diameter by 30” tall unit that holds one filter bag rated at 50 microns.
Pump Controls
Push button controls allow you to run the system when your application is running.
Transfer Pump
Add a 2HP transfer pump to the tank to send the settled water back to your application or through filtering.
Oil Skimming
For applications involving oil-based residue in the wastewater system, ALMCO offers an oil skimming solution.
Sediment Tank Model Comparison
| Specification | ST-4-50 | ST-4-100 |
|---|---|---|
| Capacity | 50 Gallons | 100 Gallons |
| Sedimentation Stages | 4 | 4 |
| Construction | 304 Stainless Steel | 304 Stainless Steel |
| Internal Baffles | 3 | 3 |
| Fluid Flow | Gravity Cascade | Gravity Cascade |
| Filtration | Optional | Optional |
| Transfer Pump | Optional | Optional |
| Hydrominder | Optional | Optional |
| Best For | Individual machines and smaller systems | Higher-volume systems and centralized fluid management |
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