Flanged reducing tees are also called flanged reducing tees; all three ports are equipped with flanges, and they connect to pipelines through bolts and sealing gaskets, so no welding is required on site. It combines the two functions of branching and reducing into one pipe fitting, making it suitable for pipeline systems with a large main pipe diameter and a small branch pipe diameter. The internal flow channel transitions smoothly, which helps reduce medium turbulence and pressure loss. The product can be manufactured by hot pressing, forging, or integral casting, and complies with standards such as GB/T12459, GB/T9113, HG/T21635, ASME B16.9, and ANSI B16.5. Materials cover carbon steel, stainless steel, alloy steel, and ductile iron, and pressure coverage includes PN6~PN100 and Class150~Class1500. For specific specifications, materials, and flange sealing face forms, please contact us for confirmation.
Overview
Flanged reducing tees belong to T-shaped pipeline branch fittings, where the main pipe diameter is larger than the branch pipe diameter, and all three ports come with flanges. During installation, bolts are used together with sealing gaskets to connect with the pipeline, without the need for on-site welding, making disassembly, assembly, and maintenance relatively convenient. While achieving pipeline diversion or confluence, it directly completes diameter reduction. One fitting replaces the traditional combination of an equal-diameter tee plus a reducer, reducing the number of pipeline accessories and pipeline leakage points. The internal flow channel transitions smoothly, which helps reduce medium turbulence and pressure loss. The product can be produced by hot pressing, forging, or integral casting processes, and complies with domestic and international standards such as GB/T12459, GB/T9113, HG/T21635, ASME B16.9, ANSI B16.5, etc.
Key Features
First, integrated diameter reduction and diversion. A single piece replaces the two accessories of an equal-diameter tee plus a reducer, reducing the number of joints, lowering leakage risk, and also simplifying the construction process. Second, three-end flange connection requires no on-site welding, making disassembly, assembly, and maintenance convenient, and is suitable for pipelines that require regular maintenance or renovation. Third, the flow channel transitions smoothly and gradually, allowing smooth medium transition, which helps reduce turbulence and pressure loss. Fourth, material and pressure coverage is wide: carbon steel, stainless steel, alloy steel, and ductile iron can all be produced, with pressure coverage from PN6 to PN100 and Class150 to Class1500, and specific configurations can be confirmed according to project requirements. Fifth, non-standard customization is supported, including diameter reduction ratio, flange sealing face, surface treatment, and marking, etc.
Applications
Flanged reducing tees are suitable for diameter-reduction diversion occasions where the main pipe has a large diameter and the branch pipe has a small diameter. In civil and municipal applications, they can be used for diameter-reduction branching in building water supply and drainage, large and small pipe diversion in central air-conditioning HVAC, branch diameter reduction of community fire main pipes, zoned diameter reduction of urban water supply networks, staged diversion of municipal heating supply, and confluence and diameter reduction of rainwater-sewage pipeline networks, etc. In industrial applications, they can be used for staged transportation in chemical process pipelines, diameter-reduction branching of petroleum and oil-gas, circulating water pipelines in power plants, sewage treatment, and infrastructure construction of new energy factories, etc. In terms of media, they can adapt to water, steam, gas, oil products, sewage, and chemical media. As for whether they are suitable for specific working conditions, please contact us for confirmation.
Specifications
Product name: Flanged reducing tee. Product category: Tees and crosses. Connection method: three-end flange bolted connection, with sealing gaskets. Executive standards: GB/T12459, GB/T9113, HG/T21635, ASME B16.9, ANSI B16.5, etc. Material: carbon steel, stainless steel, alloy steel, ductile iron, etc.; for specific grades, please contact us for confirmation. Pressure rating: PN6 to PN100, Class150 to Class1500; specific ratings are confirmed according to project requirements. Applicable media: water, steam, gas, oil products, sewage, chemical media, etc. Customization options: diameter reduction ratio, flange sealing face, surface treatment, marking, etc., can be customized according to drawings or samples. If you need to confirm specific main and branch pipe diameters, flange standards, and sealing face forms, please contact us.
Procurement & Delivery
The MOQ for mainstream conventional in-stock diameter reduction specifications starts at 1 piece, including common diameter reduction models in PN16/PN25 conventional pressure, carbon steel, and 304 stainless steel, and supports urgent replenishment for construction sites. The warehouse regularly stocks conventional mainstream diameter reduction items, and shipments are dispatched within 24 hours after order confirmation. Non-standard customized orders are arranged for production according to drawings and process requirements; for specific delivery times, please contact us for confirmation. Packaging uses graded protection: small items from DN15 to DN100 are individually wrapped in bubble film plus hard cardboard boxes; medium-diameter items from DN125 to DN400 use multi-layer bubble film plus stretch film for reinforcement; large-diameter items above DN450 are fixed on solid wood pallets, secured with steel straps, and fully wrapped with waterproof film. The outer packaging is marked with product specifications, main and branch pipe diameters, pressure, material, standard, and batch information. Export fumigation wooden pallets, waterproof packaging, and foreign trade shipping marks are supported.
Service & Support
We provide full-process support for flanged reducing tees before, during, and after sales. Before sales, we can assist with diameter reduction working condition selection, diameter reduction ratio matching, parameter verification, drawing optimization, and budget quotation. During sales, we synchronize production, quality inspection, and shipping logistics progress. After sales, we provide installation and connection guidance, pipeline maintenance suggestions, and troubleshooting answers. Conventional genuine products are uniformly provided with a 12-month warranty. During the warranty period, for quality problems such as cracking, leakage, deformation, material mismatch, and sealing failure caused by non-human damage, we support free replacement, free reissue, and bear round-trip logistics costs. We support seven-day no-reason return and exchange for standard products that are unused and in intact packaging. For large engineering projects, remote technical disclosure and full-process technical follow-up can be provided. After-sales issues are connected within 2 hours, and a solution is issued on the same day.
FAQ
What is the difference between a flanged reducing tee and an equal-diameter tee?
The reducing tee has a larger main pipe and smaller branch pipes, and can simultaneously achieve flow splitting and size reduction, used for branch working conditions where pipeline diameters are inconsistent; the equal tee has three ports of the same diameter, only performs flow splitting and merging, and has no size reduction function. The reducing tee can replace the combination of an equal tee plus a reducer, simplifying the pipeline and reducing leakage points.
Does the flanged reducing tee require on-site welding?
No. All three ports come with flanges, and it can be connected to the pipeline using bolts together with sealing gaskets, making disassembly and maintenance relatively convenient.
Can non-standard reducing ratios or special materials be customized?
Yes. We support customization of any main and branch pipe reducing ratio, materials can be customized including 2205 duplex steel, Monel alloy, Hastelloy alloy, special wear-resistant alloy steel, etc., flange sealing faces can be customized with RF, MFM, TG, RJ and other structures, and surface processes support sandblasting, blackening, hot-dip galvanizing, pickling and passivation, mirror polishing, etc. Please provide drawings, samples, or working condition parameters, and we will assist in confirmation.
What are the delivery time and minimum order quantity for conventional specifications?
For conventional in-stock mainstream reducing specifications, the MOQ starts from 1 piece, including PN16/PN25 conventional pressure, carbon steel, and 304 stainless steel commonly used reducing models. The warehouse keeps stock available, and shipment is made within 24 hours after order confirmation. Non-standard customized orders are scheduled for production according to drawings and process requirements; please contact us to confirm the specific delivery time.
How are warranty and after-sales service handled?
Regular genuine products uniformly come with a 12-month warranty. During the warranty period, for quality issues such as cracking, leakage, deformation, material non-conformity, sealing failure, etc. caused by non-human damage, free replacement, free reshipment, and coverage of round-trip logistics costs are supported. After-sales connects with the issue within 2 hours and issues a solution plan on the same day.
