Polyethylene Reducing Tee (PE Reducing Tee)

Polyethylene Reducing Tee (Reducing Tee) is one of the key fittings in pressurized piping networks that, with its three outlets, enables branching and size reduction. In this fitting, two outlets are equal-sized and colinear, while the third outlet is designed with a smaller diameter to manage flow rate and pressure in the branch. The body is produced from PE100 polyethylene and, thanks to high mechanical and chemical durability, is widely used in water supply, wastewater, oil, gas, and petrochemical services.

What is a polyethylene reducing tee?

The high-pressure welded reducing tee is an unequal PE100 fitting that is joined to the main line by two primary welding technologies—electrofusion and butt fusion. The molecular structure and suitable density of PE100 provide resistance to impact, abrasion, chemical corrosion, pressure surges, and temperature variations, ensuring reliable sealing over the service life.

Advantages and key features

• High resistance to mechanical loads, thermal stresses, and corrosive chemicals
• No rusting or rotting; suitable for humid and corrosive environments
• Lightweight with faster installation compared to metal fittings
• Low roughness coefficient and reduced pressure drop for flowing media
• Long service life and easy maintenance during operation
• Uniform sealing in welded joints, reducing leakage risk
• Compatible with sprinkler and drip irrigation systems for optimized flow control

Applications

• Urban and rural water-supply networks; transmission and distribution lines
• Firefighting systems and pressurized industrial lines
• Oil, gas, and petrochemical industries for conveying diverse fluids
• Wastewater and effluent facilities with high chemical resistance
• Agricultural irrigation networks (sprinkler and drip) for branching and pressure management

Joining methods and execution notes

Butt Fusion: Align the two faces, heat to melting temperature, then apply controlled pressure until a uniform weld bead forms.
Electrofusion: Use a coupler with an embedded heating wire; apply specified voltage and time to create a structural weld.
Key notes: Precise alignment and fixing, thoroughly clean surfaces, control weld temperature/time/pressure, allow cooling to reach final strength, and record welding parameters for quality traceability.

Dimensional guide and selection

Dimensional parameters of the reducing tee are critical for design and drafting:

• Z1: overall length of the fitting
• Z2: height from the centerline of the main run to the axis of the branch
• L1 & L2: engagement lengths for electrofusion couplers / weld ends

When selecting a size, in addition to matching the mainline and branch diameters, consider the required SDR/PN, the nature and temperature of the fluid, and the allowable pressure drop in the branch.

General technical specifications

Item	Value/Description
Body material	High-density polyethylene PE100
Joining type	Butt fusion and electrofusion welding
Manufacturing standard	DIN 16963
Applications	Water supply, wastewater, irrigation, oil, gas, and process services
Features	Resistant to corrosion, impact, abrasion, and chemicals
Operational advantage	Reliable sealing, low weight, quick installation, long service life

Size range and dimensions of high-pressure welded reducing tee (PE100)

Nominal size (mm)	Z2 (mm)	Z1 (mm)	L2 (mm)	L1 (mm)
32×63	105	216	49	65
40×63	105	216	49	65
50×63	105	216	63	67
40×75	119	249	50	73
50×75	133	250	63	71
63×75	120	245	65	72
50×90	131	275	66	71
63×90	128	271	67	72
75×90	168	267	70	69
50×110	157	318	65	86
63×110	168	318	67	87
75×110	159	320	72	81
90×110	156	319	80	86
50×125	167	337	72	90
63×125	165	340	65	90
75×125	167	337	66	89
90×125	163	332	81	89
110×125	169	341	82	91
75×140	185	380	90	83
90×140	185	380	90	83
110×140	187	380	90	85
125×140	187	380	90	85
63×160	198	406	67	102
75×160	196	402	76	98
90×160	202	399	85	102
110×160	205	406	90	104
125×160	201	407	92	103
63×180	207	445	51	108
90×180	260	428	53	108
110×180	217	440	82	110
160×180	214	440	105	105
63×200	225	440	75	116
75×200	290	443	72	116
90×200	227	450	83	118
110×200	225	448	87	116
125×200	228	450	91	117
160×200	225	405	102	116
63×225	260	530	110	120
75×225	260	530	110	120
90×225	260	530	110	120
110×225	260	530	110	120
125×225	260	530	110	120
160×225	260	530	110	120
63×250	355	518	90	101
90×250	263	519	79	102
110×250	262	520	82	104
125×250	270	515	90	100
160×250	265	523	99	102
200×250	268	515	116	105
90×315	296	596	93	92
110×315	302	590	137	118
125×315	296	595	92	92
160×315	287	590	90	93
200×315	300	600	93	91
225×315	290	600	90	91
250×315	300	595	94	117
90×355	278	646	87	119
110×355	280	647	88	120
125×355	286	648	102	119
160×355	308	650	114	118
200×355	332	645	117	119
225×355	333	645	116	119
250×355	332	645	115	120
160×400	324	645	103	101
200×400	327	670	102	115
250×400	330	670	100	113
315×400	350	670	112	120
200×500	401	788	123	122
225×500	389	770	114	123
250×500	390	780	115	120
315×500	315	770	118	118

Design and operation notes

• Hydraulic coordination: Select the branch diameter according to flow rate and allowable pressure drop so that velocity remains within standard limits.
• Anchoring and restraint: Use proper thrust restraint at direction changes and branches to control water hammer.
• Environmental conditions: For above-ground installation, protect against UV with a cover/coating or proper burial practices.
• Pressure testing: After welding and the cooling period, perform hydrostatic testing per the manufacturer’s instructions.

Brands and manufacturing quality

High-pressure polyethylene reducing tees are supplied by reputable domestic manufacturers, including Polyran and Polirod, who, using PE100 raw materials and process quality control, deliver durable products compliant with reference standards.

At the end, Tamam Baha, as a supplier of PE100 butt-welded polyethylene reducing tees, is ready to support your water-supply, irrigation, and industrial projects. While we are not the only seller, you can contact our sales team to check stock, obtain technical details, and select the appropriate size based on your project drawings.