PPH Concentric Reducer

A PPH (Polypropylene Homopolymer) Concentric Reducer is a pipe fitting used to connect two pipes of different diameters, where the centerline of both pipes remains the same (aligned). It provides a smooth and gradual reduction in pipe size, ensuring efficient flow of fluids.The PPH Concentric Reducer is a specialized pipe fitting designed to connect two pipes of different diameters along the same central axis, ensuring smooth and efficient flow transition. Constructed from Polypropylene Homopolymer (PPH), this reducer offers superior chemical resistance and mechanical strength, making it ideal for corrosive and high-temperature industrial applications.

A PPH Concentric Reducer is a center-aligned pipe fitting used to join pipes of different sizes, allowing a smooth transition of fluid flow in piping systems. Used extensively in chemical processing, water treatment plants, and industrial piping systems, the PPH concentric reducer maintains uniform flow characteristics, minimizes turbulence, and prevents fluid stagnation during size reduction transitions.

PPH Concentric Reducer Details

ID-1: Internal Diameter of the bottom opening.
OD-1: Outer Diameter of the bottom body.
WT-1: Wall Thickness of the bottom section.
SL-1: Socket Length (insertion depth) for the bottom.
ID-2: Internal Diameter of the top opening.
OD-2: Outer Diameter of the top body.
WT-2: Wall Thickness of the top section.
SL-2: Socket Length (insertion depth) for the top.
H: Total Height of the entire component

Size (Inch)	ID-1 (mm)	OD-1 (mm)	WT-1 (mm)	SL-1 (mm)	ID-2 (mm)	OD-2 (mm)	WT-2 (mm)	SL-2 (mm)	H (mm)
¾ x ½	26.97	34.79	3.91	25.40	21.64	29.10	3.73	22.23	56
1 x ½	33.78	42.88	4.55	28.58	21.64	29.10	3.73	22.23	66
1 x ¾	33.78	42.88	4.55	28.58	26.97	34.79	3.91	25.40	65
1¼ x ½	42.55	52.25	4.85	31.75	21.64	29.10	3.73	22.23	69
1¼ x ¾	42.55	52.25	4.85	31.75	26.97	34.79	3.91	25.40	68
1¼ x 1	42.55	52.25	4.85	31.75	33.78	42.88	4.55	28.58	68
1½ x ½	48.72	58.88	5.08	34.93	21.64	29.10	3.73	22.23	74
1½ x ¾	48.72	58.88	5.08	34.93	26.97	34.79	3.91	25.40	76
1½ x 1	48.72	58.88	5.08	34.93	33.78	42.88	4.55	28.58	75
1½ x 1¼	48.72	58.88	5.08	34.93	42.55	52.25	4.85	31.75	74
2 x ½	60.78	71.86	5.54	38.10	21.64	29.10	3.73	22.23	85
2 x ¾	60.78	71.86	5.54	38.10	26.97	34.43	3.73	25.40	85
2 x 1	60.78	71.86	5.54	38.10	33.78	42.88	4.55	28.58	85
2 x 1¼	60.78	71.86	5.54	38.10	42.55	52.25	4.85	31.75	83
2 x 1½	60.78	71.86	5.54	38.10	48.72	58.88	5.08	34.93	83
2½ x 2	73.56	87.58	7.01	44.45	60.78	71.86	5.54	38.10	104
3 x 2	89.31	105.55	16.24	48.63	60.78	88.54	27.76	48.93	104

Parameter	Specification
Product Type	Concentric Reducer
Material	PPH (Polypropylene Homopolymer)
Design	Conical shape, center-aligned (same axis)
Connection Type	Socket Fusion / Butt Fusion
Pressure Rating	Up to 10 bar (PN10)
Temperature Range	0°C to +100°C
Size Range	20 mm × 16 mm to 315 mm × 250 mm
Standards	DIN 8077/8078, ISO 15494, EN ISO 161
Color	Natural / Grey / Black
Manufacturing Method	Injection molded / fabricated
Application	Chemical piping, water treatment, industrial systems
Large End Diameter (D1)	Diameter of larger pipe
Small End Diameter (D2)	Diameter of smaller pipe
Length (L)	Overall length of reducer
Wall Thickness	Depends on pressure rating (SDR series)
Shape	Symmetrical conical
Centerline Alignment	Same axis on both ends
Structure	Smooth tapered body
Weight	Lightweight compared to metal reducers
Surface Finish	Smooth inner and outer surface
Corrosion Resistance	Excellent (acids, alkalis, chemicals)
Flow Characteristics	Low turbulence and pressure loss
Thermal Stability	Suitable for elevated temperatures
Weldability	Easy to weld (socket/butt fusion)
Durability	Long service life, non-rusting

Strong Mechanical Support – Ensures proper flange alignment and even gasket compression.
Excellent Chemical Resistance – Ideal for corrosive environments including acid, alkali, and saltwater exposure.
Corrosion-Free Material – Will not rust or corrode, even under harsh conditions.
Lightweight and Durable – Easier to handle and install than metal alternatives.
UV & Weather Resistant – Suitable for outdoor applications.
Compatible with PPH Flanged Systems – Designed for perfect fit with PPH stub ends.
Reusable – Can be dismantled and reused for maintenance or system modification.

Parameter	Specification
Nominal Pressure Rating	PN10 (standard)
Maximum Working Pressure	Up to 10 bar (at 20°C)
Optional Rating	PN16 (limited sizes / thicker SDR)
Hydrostatic Test Pressure	~15 bar (1.5 × PN10)
Temperature Effect	Pressure decreases with increase in temperature
Applicable Standards	DIN 16962, ISO 15494

If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.

Benefits of Using PPH Concentric Reducer

1. Smooth Flow Transition

Provides a gradual and uniform reduction in pipe diameter
Minimizes turbulence, pressure drop, and flow disturbance

2. Excellent Corrosion Resistance

Resistant to acids, alkalis, and aggressive chemicals
Ideal for chemical processing and wastewater systems

3. Lightweight and Easy Handling

Much lighter than metal reducers
Simplifies transportation and installation

4. High Chemical Compatibility

Suitable for a wide range of industrial fluids and corrosive media
Non-reactive with most chemicals

5. Low Pressure Loss

Concentric design ensures efficient fluid flow
Improves overall system performance

6. Easy Installation

Compatible with socket fusion and butt fusion welding
Provides strong, leak-proof joints

7. Low Maintenance

Non-corrosive material reduces maintenance and replacement costs
Long service life

8. Thermal Resistance

Can withstand temperatures up to ~100°C
Maintains structural stability under thermal stress

9. Cost-Effective

More economical than metallic reducers in corrosive environments
Reduces lifecycle costs

Types of PPH Concentric Reducer

1. Based on Connection Type

a) Socket Fusion Concentric Reducer

Joined using socket welding technique
Common for small diameter piping systems
Provides strong and leak-proof joints

b) Butt Fusion Concentric Reducer

Joined by butt welding (heat fusion)
Suitable for medium to large diameter pipes
Ensures uniform strength across the joint

c) Threaded Concentric Reducer

Provided with internal threads
Used in low-pressure and easy-installation systems
No welding required

2. Based on Construction Method

a) Injection Molded Reducer

Manufactured by molding process
Used for standard sizes and high production
Smooth finish and consistent quality

b) Fabricated Reducer

Made by cutting and welding PPH sheets or pipes
Used for custom sizes and large diameters

3. Based on Size Reduction Pattern

a) Single Step Concentric Reducer

One-step reduction (e.g., 100 mm → 50 mm)
Most commonly used type

b) Multi-Step Concentric Reducer

Gradual reduction through multiple stages
Used to minimize pressure drop in large reductions

4. Based on Application

a) Industrial Grade Reducer

Used in chemical plants, water treatment, process industries

b) High-Purity / Chemical Grade Reducer

Designed for corrosive and sensitive fluid handling

Applications of PPH Concentric Reducer

Process Industry

High Purity Applications

Electronic Industry

Electrical Industry

Semi-conductors Industry

Pharmaceutical Industry

Solar power panels

Sugar Industry

Paper & Pulp Industry

Nuclear Power Industry

Automotive Industry

DI water plants

Why Choose Petron Thermoplast?

Petron Thermoplast is your go-to solution when you need precise flow control in industrial applications. They create higher pressure drops than some alternatives, but that tortuous flow path is exactly what gives them their incredible throttling capability.

Use Petron Thermoplast PPH Concentric Reducer when You need frequent flow adjustments, Precise control is more important than minimal pressure drop, Reliable shut-off is critical, Dealing with steam, hot water, or other fluids that benefit from gradual flow changes