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T-type Strainer
1 Product Overview
T-type Strainer (straight / reverse flow) is a pipeline basket coarse filter. Medium horizontally enters housing from inlet, flows radially through filter basket, solid contaminants are trapped inside basket; purified medium flows horizontally to outlet. Continuous contaminant accumulation gradually raises differential pressure across screen.After shutdown, top cover bolts are loosened to lift out basket for cleaning, then reset for operation. Compared with Y-type strainers, T-type adopts horizontal straight layout, better suited for DN200+ large main pipelines. Medium spillage is minimized during cover opening maintenance, widely used for processes prohibiting arbitrary medium discharge.Normally installed upstream of pumps, heat exchangers and pressure reducing valves as primary barrier to intercept construction welding slag and operational rust deposits, protecting downstream precision equipment from erosion and clogging.
2 Main Structural Composition
T-shaped Pressure Vessel Housing AssemblyWCB / stainless steel welded & forged housing with horizontal inlet & outlet flanges, top maintenance flange cover. Polished inner surface reduces contaminant adhesion & scaling.
Removable SS Filter Basket AssemblyIntegrated cylindrical basket with multi-layer composite mesh, reinforced supporting frame for optional mesh replacement.
Top Quick-open Flange Sealing AssemblyMetal spiral wound / flexible graphite gasket withstand high temperature & pressure for stable sealing. Even bolt clamping prevents uneven leakage.
Bottom Blowdown Connection (Optional)Threaded / flanged port with manual ball valve for offline purging of heavy sediment without frequent basket removal.
DP Transmitter Tap Port (Optional)Reserved pressure tapping for differential pressure switch / transmitter to remotely transmit clogging signal.
Lifting Lugs (Standard for large sizes)Facilitate hoisting installation for heavy-duty units.
3 Working Principle
Solid-contaminated medium flows into T-shaped chamber via horizontal inlet, penetrates cylindrical basket radially. Particles, welding slag and oxide scale larger than mesh aperture are trapped on inner surface of basket; purified fluid flows horizontally towards pipeline outlet.Continuous contaminant accumulation reduces effective flow area and raises differential pressure. Operators arrange shutdown maintenance based on DP data. Open top flange cover, lift basket upward, clean internal dirt via high-pressure water or compressed air; reinstall basket, tighten cover and restore pipeline service.Models equipped with blowdown valve support in-chamber purging during shutdown, lowering frequency of basket extraction.
4 Basic Technical Parameters
Applicable medium: industrial circulating water, steam, thermal oil, lubricant, compressed air, light process oilHousing material: WCB carbon steel / 304 / 316L / 2205 duplex stainless steelNominal pressure: PN16 / PN25 / PN40 (Class150~600 high-pressure customized)Operating temperature: -20～350℃ (steam jacket version up to 420℃)Optional filtration rating: 20μm ~ 10 mm (custom mesh 2～600 mesh)Nominal diameter: DN50 ~ DN1000Installation: horizontal pipeline flange inline mountingPattern: straight flow, reverse flowFlange standard: GB flange, ANSI B16.5 raised face flangePower supply: mechanical passive equipment, no external power required
5 Core Product Advantages
Horizontal straight T-layout balances fluid resistance for large bore pipelines with higher throughput versus equivalent Y-type strainer.
Top upward pull-out basket limits medium spillage during horizontal pipeline maintenance, ideal for toxic, valuable & volatile fluid pipelines.
Large dirt holding capacity prevents premature mesh penetration and extends maintenance intervals.
Flexible material selection: carbon steel for clean water & oil; stainless / duplex steel for seawater and weak acid & alkaline medium.
Supports horizontal installation at any angle, free from vertical space restriction, excellent for compact pipe racks & multi-layer pipe support retrofits.
Fully welded pressure-bearing structure resists water hammer, suitable for pipelines with frequent startup-stop & load fluctuation.
Modular spare parts, interchangeable baskets, gaskets and fasteners simplify spare inventory management.
Visual inspection available after cover opening, directly judge sediment level without relying solely on instrument data.
Easy maintenance; single operator can complete basket disassembly & cleaning without heavy lifting gear for DN400 and below standard models.
Compatible with new pipeline construction & old pipeline retrofitting without major pipe rerouting, cutting construction expenditure.
6 Installation, Commissioning & Maintenance Specification
Install strictly following flow arrow marking on housing; reverse inlet/outlet connection prohibited. Fit sealing gasket between flanges and tighten bolts evenly in diagonal sequence to avoid offset leakage.Preferred installation position: pump suction side and upstream of heat exchangers. Reserve vertical overhead space for basket lifting.Remove top cover before initial startup to clear welding slag and metal debris inside vessel; confirm flow direction matches pipeline.Check flange & cover leakage during daily patrol; record differential pressure trend to schedule predictive maintenance.Fully inspect basket for perforation & deformation during annual overhaul and replace aged sealing gaskets simultaneously.Install upstream sediment tank or primary pre-filter if medium contains massive oily sludge.Close isolation valves and drain residual medium inside housing for long-term shutdown maintenance to avoid internal rust & scaling.
7 Common Faults & Solutions
Rapid DP rise with frequent maintenanceCauses: aggravated upstream pipeline corrosion; damaged mesh; excessive suspended solidsSolutions: inspect pipe wear; replace complete basket; add upstream pretreatment system
Persistent leakage at top flange coverCauses: aged deformed gasket; uneven bolt tension; distorted cover plateSolutions: install brand-new high-temperature resistant gasket; retighten all bolts evenly; re-machine cover sealing surface if needed
Regular basket deformation & collapseCauses: excessive instantaneous flow impact; insufficient basket reinforcement; over-fine mesh selectionSolutions: install pipeline buffer device; adopt reinforced frame basket; select proper mesh aperture
DP cannot recover fully after basket cleaningCauses: fine particles embedded inside mesh pores; heavy sediment settled on bottomSolutions: offline high-pressure cleaning for basket; equip bottom blowdown valve for periodic purging
8 Standard Supply List & Optional Accessories
Standard Supply List
T-shaped pressure vessel housing, stainless steel basket assembly, top flange cover, metal wound sealing gaskets, inlet & outlet flanges, complete fasteners, flow direction nameplate.
Optional Accessories
Spare baskets with different precision, bottom manual blowdown ball valve, differential pressure transmitter set, steam insulation jacket assembly, ANSI standard flange, remote pressure tapping port, explosion-proof sealing kit.
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