Plants install Water intake screens wherever they must withdraw reliable volumes of water while keeping debris, sediment, and aquatic organisms out of pumps and downstream equipment.A fish screen acts as a unique intake screen. Designers adjust its hydraulic and slot features. This cuts fish impingement and entrainment. An industrial water intake screen guards fish too. Yet, its core job is broader. It shields cooling-water systems, pretreatment units, process equipment, and pumping stations.
Fish Screens vs. Industrial Water Intake Screens
Continuous-Slot Wedge Wire Construction
Manufacturers weld V-shaped profile wires to support rods to form the continuous slots in a wedge wire fish screen. The slot widens below the screen face, which reduces the chance that particles will lodge in the opening.
Fish-Protection Design Factors
Fish-protection performance depends not only on the physical slot width, but also on approach velocity, sweeping flow, target species, life stage, water level, and operating conditions.
Industrial Intake Priorities by Application
Industrial water intake screens use the same wedge wire principle, but project priorities vary by application.
| Application | Typical intake duty and design priorities |
| Power generation, municipal, and desalination intakes | Protect pumps, condensers, and pretreatment equipment; check high flow, head loss, algae, sediment, and chloride exposure. |
| Industrial process water, irrigation, and pumping | Supply raw or recycled water and exclude leaves, weeds, and sand; match water chemistry, solids, variable levels, and cleaning method. |
Hydraulic Design and Screen Area
Preliminary Screen Area Calculation
The starting point is the required design flow.Designers commonly estimate gross submerged screen area from:
Screen area = Design flow / Allowable face velocity
Net Open Area and Blockage Allowance
Designers must then check this preliminary area against the net open area. Profile wire width, slot opening, support-rod spacing, frames, flanges, and connection details all reduce the effective flow area. Designers should review through-slot velocity at the minimum operating water level and with the specified partial blockage allowance, not only under clean-screen conditions.
Fish Screen Slot Criteria
For fish screens, designers must select an opening that reflects the smallest exclusion-critical body dimension of the species and life stage that the screen must protect. A very small slot is not automatically the best choice. Narrower openings increase resistance and may require more screen area or more frequent cleaning.
Industrial Slot Selection
For industrial water intake screens, designers usually determine slot size according to the particle size that downstream pumps, heat exchangers, nozzles, or pretreatment equipment can tolerate.
Sweeping Flow and Screen Orientation
Sweeping flow is also important. A current parallel to the screen face helps carry fish and released debris away from the intake. Where natural current is weak, screen orientation, location, airburst cleaning, or mechanical cleaning may need to compensate.
Configuration, Materials, and Service Conditions
Flat Panels for Channels and Retrofits
Flat wedge wire panels fit channels, walls, and bypass structures. They suit retrofit openings too.
Cylindrical and T-Screen Configurations
Designers favor cylindrical screens and T-screens for river, lake, or offshore intakes. These offer larger submerged areas. Meanwhile, they keep a compact footprint.
Flow Direction and Structural Constraints
Flow runs outside-to-inside or inside-to-outside. This relies heavily on structural loads, piping layouts, and chosen cleaning methods.
Stainless Steel Grade Selection
SS304 and SS304L are cost-effective for freshwater systems. SS316 and SS316L add stronger resistance. They handle brackish water and chloride-bearing service well. Engineers select SS321, 904L, duplex 2205, and super duplex 2507 for harsh spots. They evaluate water chemistry, heat, welding, and lifespan first.
Clogging Control and Maintenance
Common Clogging Sources
Leaves, algae, fibers, shells, and suspended solids block open areas. This quickly spikes differential pressure.
Airburst Cleaning and Maintenance Triggers
Crews rely on airburst backwashing for submerged cylindrical and T-type screens. The reverse pulse clears debris easily. This skips complex screen removal. Operators tie cleaning frequency to true debris loads, intake flow, and pump suction. They monitor differential pressure and past cycles. A solid spec sets the partial-blockage condition. It clearly states the exact cleaning trigger.
Custom Manufacturing Support from Jingzhou Metal
Factory-Direct Custom Engineering
Jingzhou Metal is a source manufacturer rather than a trading company, providing factory-direct supply and custom processing for wedge wire and stainless steel profile wire. The team can manufacture from customer drawings or help develop a screen around the actual flow, water chemistry, debris, pressure, installation space, connection, and cleaning requirements.
In-House Wire-Forming and Process Control
Its in-house wire-forming route uses two drawing stages and two annealing stages, together with shaped rolling and precision finishing. This supports stable profile dimensions, continuous slot control, and consistent welding performance.
Prototyping, Production, and Material Options
Jingzhou Metal accepts small-batch sampling and prototype orders, while also supporting production quantities and international shipment. With more than 18 years of manufacturing experience and global export experience, the company can offer stainless steel grades ranging from cost-effective general-purpose options to higher-alloy materials for demanding service.
FAQ
What information is needed to quote a custom water intake screen?
Provide design flow, minimum and maximum water levels, required slot size or retained particle size, water chemistry, temperature, debris conditions, installation dimensions, allowable head loss, flow direction, connection details, and preferred cleaning method. For a fish screen, also provide target species, life stage, and applicable velocity criteria.
Can Jingzhou Metal customize water intake screens from drawings?
Yes. Custom slot opening, profile wire, support rod, panel or cylinder dimensions, frame, flange, end connection, flow direction, and cleaning interface can be produced from drawings. Engineering adjustments can also be proposed for the actual operating conditions.
What is the lead time for custom wedge wire intake screens?
Lead time depends on material, dimensions, welding complexity, order quantity, and inspection requirements. Standard or repeat products may be completed faster. New custom products generally require drawing confirmation and may follow a 7-15-day development cycle before the final production schedule is confirmed.
Can procurement teams order samples or small batches?
Yes. Jingzhou Metal supports small-batch sampling and trial production so buyers can verify dimensions, fit, slot accuracy, material, and filtration performance before placing a larger order.
Which stainless steel grades can Jingzhou Metal provide?
Common options include SS302, SS304, SS304L, SS316, SS316L, SS321, and SS430. For more corrosive industrial water intake applications, 904L, duplex 2205, super duplex 2507, and other alloys can be discussed according to the project specification.
What quality documents can accompany an order?
Depending on the purchase specification, the order package can include approved drawings, material verification, dimensional and slot inspection records, and agreed quality documents. Buyers should list required certificates and inspection points before order confirmation.