Positive Tee Pipe

Overview of Positive Tee Pipe​

Sikerui Positive Tee Pipe​ is a precision-engineered pipe fitting designed with a T-shaped configuration​ to create 90-degree branch connections in piping systems, facilitating efficient flow distribution in multiple directions . Manufactured from high-performance materials including steel-plastic composites, PVC, and polyethylene, this fitting features a unique design where all three outlets are aligned in the same plane, ensuring optimal fluid dynamics and minimal pressure drop . Unlike reducing tees, the positive tee maintains consistent dimensions across all openings, providing symmetrical flow characteristics ideal for balanced distribution systems .

Engineered to meet international standards such as ISO 4422 and DIN 80707, Positive Tee Pipes operate effectively in temperatures ranging from -20°C to 110°C and withstand pressures up to 1.6 MPa (PN16) . Their robust construction and corrosion-resistant properties make them suitable for demanding applications in water supply, chemical processing, irrigation, and industrial plumbing . With a service life exceeding 50 years, these fittings offer a reliable, maintenance-free solution for complex piping networks where directional changes and flow divisions are critical .

Key Features of Positive Tee Pipe​

1. Superior Flow Distribution​

The symmetrical design of Positive Tee Pipes ensures balanced flow distribution​ between branch lines, minimizing turbulence and pressure loss . The smooth interior surface reduces friction resistance, preventing sediment accumulation and maintaining efficiency in water and chemical transport systems . This optimized hydraulic performance is particularly valuable in irrigation and municipal water distribution networks where consistent pressure is essential .

2. Robust Composite Construction​

Positive Tee Pipes utilize steel-plastic composite technology, combining a galvanized steel core with inner and outer layers of polyethylene or polypropylene . This structure provides the strength of metal with the corrosion resistance of plastics, resulting in a fitting that withstands harsh chemicals, soil stresses, and environmental factors while maintaining structural integrity . The composite design also reduces weight by up to 30% compared to traditional metal fittings, simplifying handling and installation .

3. Electrofusion Compatibility​

Many Positive Tee Pipes are designed for electrofusion connection systems, enabling seamless, leak-proof joints with parent pipes through controlled heating elements integrated into the fitting . This creates monolithic connections that exceed pipe strength, ensuring long-term reliability in pressurized applications . The electrofusion process reduces installation time by up to 50% compared to mechanical joining methods, while allowing for visual inspection of proper joint formation .

4. Chemical and UV Resistance​

The polyethylene or polypropylene layers provide exceptional resistance​ to acids, alkalis, and ultraviolet radiation, making Positive Tee Pipes suitable for both underground and exposed installations . This chemical inertness prevents scaling and degradation, maintaining water quality in potable systems and ensuring longevity in agricultural and industrial applications where fertilizers or chemicals are present .

5. Versatile Sizing and Configuration​

Available in sizes from DN20 to DN630, Positive Tee Pipes accommodate various system requirements, with customization options for specific project needs . The consistent diameter across all three connections simplifies system design and inventory management, while standardized dimensions ensure compatibility with existing piping infrastructures .

Typical Applications of Positive Tee Pipe​

Water Distribution Systems​

Positive Tee Pipes are extensively used in municipal water networks​ to create branch connections for residential and commercial supply lines . Their corrosion resistance and smooth interior prevent scaling and maintain water quality, while the robust construction withstands soil pressures and loading conditions in buried applications . The symmetrical design ensures balanced pressure distribution across branch lines, optimizing system performance .

Industrial Chemical Processing​

In chemical plants and manufacturing facilities, Positive Tee Pipes handle corrosive fluids and aggressive media​ without degradation . The chemical-resistant materials maintain integrity when transporting acids, alkalis, and solvents, providing reliable performance in demanding industrial environments where metal fittings would corrode . Their electrofusion capability creates leak-proof joints essential for hazardous material containment .

Agricultural Irrigation Systems​

The UV-resistant properties​ of Positive Tee Pipes make them ideal for outdoor irrigation systems, where they facilitate flow distribution to multiple zones from main supply lines . Their durability withstands exposure to fertilizers and pesticides, while the smooth interior prevents clogging from sediment or mineral deposits common in agricultural water sources .

Mining and Dewatering Operations​

In mining applications, Positive Tee Pipes provide reliable connections for dewatering and slurry transport systems, resisting abrasion from suspended solids and chemical corrosion from mine water . Their robust construction handles the dynamic pressures and demanding conditions of mining operations, outperforming traditional materials in longevity and reliability .

Gas Distribution Networks​

Specialized Positive Tee Pipes with gas-grade certifications​ are used in natural gas distribution systems, providing secure branch connections that maintain integrity under fluctuating pressures . The electrofusion joints create permanent, leak-proof seals essential for gas applications, while the material compatibility ensures long-term safety and performance .

Technical Specifications​

Table: Standard Positive Tee Pipe Specifications

Parameter​	Specification Range​	Standards​
Size Range​	DN20 to DN630 (½” to 24″)	ISO 4422, DIN 80707
Pressure Rating​	PN10 to PN16 (1.0-1.6 MPa)	Application-dependent
Temperature Range​	-20°C to 110°C	Material-specific
Materials​	Steel-Plastic Composite, HDPE, PP-R, PVC	Various certifications
Connection Types​	Electrofusion, Socket Fusion, Threaded	Industry standards
Standards Compliance​	ISO 9001, ISO 4422, DIN 80707	International certifications

 

SIZE	NO.	D1	D2	L1	L2	L3
DN15	ST15	20.3	26.3	16.5	41.12	56
DN20	ST20	25.3	31.9	19	48.93	66
DN25	ST25	32.35	39.95	22.5	59.96	80
DN32	ST32	40.4	49.8	26.5	72.73	96
DN40	ST40	50.45	60.25	31.5	88.27	116
DN50	ST50	63.5	75.9	38	109.09	142
DN65	ST65	75.5	88.91	44	127.47	166
DN80	ST80	90.55	105.15	51.5	150.12	196
DN100	ST100	110.6	127.39	61.5	181.92	236
DN125	ST125	140.6	161.4	76	228.82	295.5
DN150	ST150	160.7	184.5	86.5	260.8	335
DN200	ST200	200	228.1	106.2	322.05	416
DN250	ST250	226.2	253.8	118.5	361	466.5
DN250	ST250	250	283.4	131.5	400.2	517
DN250	ST250	281.5	315.5	147	446	580
DN300	ST300	316.7	355	165	504	654
DN350	ST350	356.8	395	185	566	738
DN400	ST400	402	442	208	634	828
DN250(PN10)	ST250	280.6	306	147	448	552
DN300(PN10)	ST300	315.7	344	165	502	453
DN350(PN10)	ST350	355.8	385	183.5	564	736.5
DN400(PN10)	ST400	401	432	208	634	826

Frequently Asked Questions (FAQs)​

Q1: What distinguishes a Positive Tee Pipe from a standard tee fitting?​

A Positive Tee Pipe features symmetrical dimensions across all three openings, ensuring consistent flow characteristics, whereas standard tees may have reducing branches . This design provides balanced distribution without the flow restrictions common in reducing configurations, making it ideal for applications requiring equal flow division .

Q2: Can Positive Tee Pipes be used for potable water applications?​

Yes, Positive Tee Pipes manufactured from certified materials​ comply with drinking water standards such as NSF/ANSI 61, ensuring safe transport of potable water . The non-toxic, inert materials prevent taste or color transfer, maintaining water quality throughout the system’s service life .

Q3: What installation methods are recommended for Positive Tee Pipes?​

Electrofusion is the preferred method​ for permanent, leak-proof joints, though socket fusion and threaded connections are also available . Electrofusion ensures homogeneous integration with the pipe, creating a connection stronger than the pipe itself . Proper installation requires clean, prepared surfaces and controlled heating cycles according to manufacturer specifications .

Q4: How does the steel-plastic composite construction enhance performance?​

The composite design combines the strength of steel​ with the corrosion resistance of plastics, creating a fitting that withstands both internal pressure and external stresses while resisting chemical degradation . The steel core provides dimensional stability and pressure resistance, while the plastic layers protect against corrosion and abrasion, resulting in a fitting that outperforms single-material alternatives .

Q5: What is the typical lifespan of Positive Tee Pipes in underground applications?​

When properly installed, Positive Tee Pipes typically exceed 50 years of service​ in buried conditions, thanks to their corrosion-resistant materials and robust construction . The composite materials resist soil chemicals, moisture, and environmental stressors that degrade traditional fittings, ensuring long-term reliability with minimal maintenance .