Specification

TIANYU Carbon Steel Fabricated Butt-Welded Tee-Type Strainer

I. Product Overview

TIANYU carbon steel welded tee-type strainer is a precision filtration device designed for medium and high-pressure industrial pipelines. Adopting a tee-type structure and fabricated manufacturing process, its core function is to intercept solid impurities (such as rust, welding slag, and particles) in fluids like water, oil, and steam, protecting downstream valves, pumps, heat exchangers, and other key equipment from wear or blockage. Its main body is made of high-quality carbon steel (e.g., WCB), with a 304 stainless steel filter screen. It fits pipelines with diameters from DN15 to DN1000, covering pressure ratings of 150lb-900lb (1.6-4.0MPa), and can operate stably at a maximum temperature of 300°C. Through flange or butt-weld connections, it is compatible with international standard pipeline systems, widely used in petrochemical, power, water treatment, industrial hydraulic, and other fields, serving as the “protective core” in complex pipeline systems.

II. Key Attribute Parameters

Specifications and Dimensions:
- Diameter range: DN15-DN1000 (meeting needs from small equipment interfaces to large industrial main pipelines);
- Structural dimensions: Different types (ST-A, ST-B, ST-C, ST-D) have varying sizes. Taking DN100 as an example, ST-A type has a length of 380mm and height of 104mm, while ST-B type has a length of 380mm and height of 104mm (specific dimensions increase with diameter, complying with ANSI B 16.34 standard).
Pressure and Temperature:
- Working pressure: 150lb-900lb (1.6-4.0MPa), suitable for medium and high-pressure pipeline systems;
- Test pressure: Hydrostatic test at 2.4-6.0MPa (1.5 times working pressure) with no leakage under pressure;
- Medium temperature: Maximum 300°C, capable of withstanding medium and high-temperature fluids (such as superheated steam, hot oil).
Connection and Material:
- Connection methods:
  - ST-A/ST-D: RF flange connection (complying with ANSI B 16.34) for easy disassembly and maintenance;
  - ST-B/ST-C: Butt-weld connection to enhance system tightness and structural strength;
- Main body material: Carbon steel (WCB, WC1, WC6, etc.) with tensile strength ≥485MPa, suitable for high-pressure conditions;
- Filter screen material: 304 stainless steel, rust-resistant, with mesh precision selectable as needed (10-100 mesh as standard);
- Sealing element: Asbestos gasket with good temperature resistance, ensuring reliable sealing under high pressure.
Standards and Certifications:
- Design standard: ANSI B 16.34 (valve size and pressure rating specification);
- Test standard: API 598 (valve pressure testing and tightness inspection);
- Certifications: CE, SGS, ISO 9001, etc., meeting international industrial safety and quality requirements.

Product Overview

III. Structural Features and Design Advantages

The combination of tee-type structure and welding process endows the product with multiple core advantages:

Hydrodynamic Optimization: The tee-type flow channel design enables symmetric splitting of medium flow, allowing impurities to be efficiently intercepted in the filter screen area under the action of gravity and turbulence. Filtration efficiency is 15% higher than that of Y-type strainers; the inner wall of the flow channel is precision-polished with a local resistance coefficient ≤3.0, reducing system pressure loss.
Flexible Connection Adaptability: Supporting both flange (ST-A/ST-D) and butt-weld (ST-B/ST-C) connections, it can be directly integrated into different pipeline systems: flange connection facilitates later maintenance, while butt-weld connection is suitable for scenarios with high pressure and low leakage requirements (such as steam pipelines), saving pipe materials and reducing installation costs.
Full Welding Structural Strength: The main body adopts a fabricated welding process, with key welds undergoing non-destructive testing (PT/UT). Tensile strength is ≥400MPa, with no deformation risk under 900lb (4.0MPa) pressure, far exceeding the pressure-bearing capacity of ordinary cast iron strainers.
Durability Design: The 304 stainless steel filter screen is fixed by laser welding, with burr-free edges and strong impact resistance, and can be repeatedly cleaned for reuse; the carbon steel main body undergoes rust removal treatment and is coated with high-temperature anti-rust paint, passing a 500-hour salt spray test, adapting to humid industrial environments.
International Standard Compatibility: Dimensions and pressure ratings fully comply with ANSI B 16.34, enabling direct connection to European and American standard pipeline systems without additional adaptation, especially suitable for multinational projects or imported equipment matching.

IV. Manufacturing Processes and Quality Control

TIANYU relies on a mature fabricated manufacturing system to ensure stable performance of each strainer:

Material Selection and Pretreatment:
High-quality carbon steel billets (such as WCB) complying with A234 standards are selected, with chemical composition verified by spectral analysis (C≤0.30%, Mn≤1.00%) to ensure mechanical properties meet standards; raw materials undergo sandblasting for rust removal (Sa 2.5 level) to improve welding and coating adhesion.
Precision Machining and Welding:
- Main body assembly: CNC cutting is used for blanking, and the tee joint is spliced by automatic submerged arc welding. After welding, annealing treatment is performed to eliminate stress, with weld reinforcement ≤1mm;
- Flange machining: The RF flange sealing surface is precision-machined by vertical lathe, with flatness error ≤0.05mm and roughness Ra≤12.5μm, ensuring tight fit with pipeline flanges;
- Filter screen forming: 304 stainless steel wires are woven and stamped into a basket structure, with edges argon arc welded to the flange plate, welding strength ≥300MPa, and no leakage risk.
Testing and Inspection:
- Hydrostatic testing: Each strainer is pressure-tested at 2.4-6.0MPa for 30 minutes without leakage or structural deformation;
- Flow testing: Simulating the design flow rate (1.5-3m/s), the measured resistance loss deviates from the theoretical value by ≤5%;
- Material re-inspection: Random sampling for tensile tests to ensure carbon steel tensile strength ≥485MPa and filter screen corrosion resistance meet standards.
Surface Treatment and Packaging:
The carbon steel surface is sprayed with high-temperature anti-rust paint (dry film thickness ≥80μm), and the flange sealing surface is covered with a protective pad; finished products are packaged in plywood boxes to prevent damage during transportation.

Valve Details

V. Core Product Advantages

High Strength and High Pressure Resistance: The carbon steel main body and full welding structure can withstand 150lb-900lb (1.6-4.0MPa) pressure, maintaining structural stability at 300°C, suitable for harsh conditions such as steam and hot oil.
Multi-Scenario Adaptability: DN15-DN1000 diameter covers needs from small equipment to large pipe networks; flange and butt-weld connections adapt to different installation environments (such as butt-weld for pipeline interlayers with limited space, and flange for systems requiring frequent maintenance).
International Standard Compatibility: Complying with ANSI B 16.34 design standards and API 598 test specifications, with complete CE and SGS certifications, it can be directly used in European and American market projects, reducing import and export compliance costs.
Efficient Production and Delivery: Annual production capacity reaches 50,000 pieces, with minimum order quantity of 1 piece for conventional models, and bulk orders can be quickly responded to, ensuring project progress is not affected by equipment supply.
Low Cost and Long Service Life: Carbon steel material costs 30% less than stainless steel, and the 304 stainless steel filter screen can be repeatedly cleaned, with lifecycle costs 25% lower than similar products; the failure rate within the 1-year warranty period is less than 1%.

Application

VI. Application Fields and Scenarios

Petrochemical Industry:
- Crude oil transportation pipelines: Filter sand and rust in pipelines to protect metering pumps and control valves;
- Reactor feeding systems: Intercept catalyst particles to avoid blocking heat exchanger tubes.
Power and Energy:
- Steam pipelines in power plants: Filter scale in steam to prevent wear of turbine blades;
- Boiler feed water systems: Remove impurities in feed water to reduce the risk of boiler scaling.
Industrial Hydraulics and Lubrication:
- Hydraulic station oil return pipelines: Filter metal debris to protect servo valves and oil cylinders;
- Rolling mill lubrication systems: Intercept oxidized impurities in lubricating oil to extend equipment life.
Water Treatment and Municipal:
- Industrial cooling water systems: Filter algae and suspended solids in circulating water to prevent blockage of cooling tower fillers;
- Sewage treatment plants: Intercept large particles in sludge to protect sludge pump impellers.
Food and Pharmaceutical Auxiliary Systems:
- Steam sterilization pipelines: Filter impurities in steam, with 304 filter screens meeting hygiene requirements;
- Hot oil jacketed pots: Remove carbides in thermal oil to ensure uniform heating.