In modern pipeline engineering, PVC pipe fittings are widely used due to their light weight, corrosion resistance, strong chemical resistance and reasonable price. From small household pipelines to large industrial systems, PVC pipe fittings play a significant role. Although 3.5-inch pvc pipe fittings are not the most common size on the market, they play an irreplaceable role in some medium-sized flow pipe systems, industrial equipment connections, drainage projects and agricultural conveying systems. This article will provide an in-depth introduction to 3.5-inch pvc pipe fittings from the aspects of specification significance, features, common types, application fields to key purchasing points.
What is 3.5-inch pvc pipe fittings?
3.5-inch pvc pipe fittings refer to PVC plastic pipe connection fittings with a nominal pipe diameter (NPS) of 3.5 inches.
This specification is less common in the American system. The common sizes are often 3 “and 4”. Therefore, 3.5″ is usually used for special projects, such as:
Special equipment interface
Transitional dimensions in the renovation project
Customize water delivery and drainage systems
Industrial pipelines
The function of PVC pipe fittings is to connect pipes, change direction, divert, merge or connect to other equipment.
The main features of 3.5-inch pvc pipe fittings
Despite its special specifications, 3.5-inch PVC pipe fittings still share the common advantages of PVC pipes:
1. Strong corrosion resistance
PVC (polyvinyl chloride) is not corroded by acids, alkalis, salts or most chemical substances, making it highly suitable for long-term stable operation of water transmission systems and chemical environments.
2. Lightweight and easy to install
Compared with metal pipe fittings, PVC is lighter, does not require professional equipment for construction, has high installation efficiency and low maintenance costs.
3. High toughness and durability
PVC pipe fittings have a stable structure, are not prone to breakage, and can resist moderate mechanical shock and daily wear and tear.
4. Smooth inner wall reduces flow resistance
The smooth inner wall reduces water flow resistance, making the conveying efficiency higher and suitable for medium-sized flow systems.
5. Moderate price and high cost performance
PVC is less expensive than metal fittings and is especially suitable for large-scale projects or those with limited budgets.
6. Compatible with multiple connection methods
Including:
Solvent Cement
Threaded connection
Flange connection (Flanged
Meet the requirements of different working conditions.
Common types
Although the dimensions are rather special, the types of conventional pipe fittings are still complete and can meet the requirements of complex engineering designs.
1. 90° Elbow
It is used to change direction and often appears at drainage pipes or equipment connections.
2. 45° Elbow
It is used to make water flow more smoothly and reduce pressure loss, and is suitable for water supply pipelines.
3. Tee
It is divided into
Equal diameter tee (3.5″ × 3.5″ × 3.5″)
Reducer tee (e.g. 3.5″ × 3.5″ × 3″)
Used for branch pipe diversion.
4. Direct Coupling
It is used to connect two 3.5-inch PVC pipes, with the simplest structure and the widest application.
5. Reducer Joint
Used for the transition of pipes of different sizes, such as
3.5″ to 3″
3.5″ to 4″
This type of joint is highly suitable for renovation projects or situations where the interfaces of equipment are inconsistent.
6. Flange
It is used for detachable construction, such as pumping stations, filters, valves, etc.
7. Thread Adapter (Male/Female Adapter)
It is suitable for equipment interfaces or systems that require frequent disassembly.
8. End Cap
Block the end of the pipeline to maintain the system’s airtightness.
These pipe fittings form a complete 3.5-inch PVC system, making it suitable for complex engineering structures.
Application field
Due to its special dimensional characteristics, 3.5-inch PVC pipe fittings are widely used in the following industries:
1. Industrial liquid transportation
Suitable for conveying
Cooling water
Industrial wastewater
Chemical solution
Circulating water system
Strong corrosion resistance, suitable for long-term use in factory areas.
2. Municipal and building drainage systems
In some transition pipelines or non-standard equipment interfaces, 3.5 inches is a particularly effective connection size.
3. Agricultural irrigation system
It is used for medium-sized water transmission pipelines, such as the connection of main or branch pipes in the field.
4. Water treatment equipment
Including:
Sedimentation tank
Filtration system
Disinfection equipment
The pump room is connected to pipes
It is mostly used for output terminals or intermediate connections.
5. Swimming pool and SPA system
It is used for medium flow connection between circulating water and filtration systems.
6. Special electromechanical equipment interfaces
Some imported or industrial equipment uses 3.5-inch interfaces, and PVC pipe fittings can be perfectly adapted.
How to choose the right 3.5-inch PVC pipe fittings?
1. Confirm the pressure level
Usually there are:
Schedule 40 (Atmospheric Pressure)
Schedule 80 (High Voltage)
SCH 80 is recommended for industrial systems.
2. Select an appropriate connection method
Solvent glue is used to fix pipelines
Threads are suitable for detachable systems
Flanges are suitable for connecting large equipment
3. Corresponding pipe material standards
Ensure compliance with ASTM, ISO or local standards.
4. Check the chemical resistance
Especially when used in chemical plants, it is necessary to confirm whether the PVC is compatible with the medium.
5. Select reliable brands or manufacturers
Ensure that the pipe fittings have high dimensional accuracy, good sealing performance and long service life.
Although 3.5-inch pvc pipe fittings are not as common as 2″, 3″ or 4″ ones, they are of great value in industrial systems, special engineering renovations, equipment interface connections and medium-flow water treatment systems. It features lightness, corrosion resistance, easy installation, reasonable price and wide application range, and can meet various water transmission and drainage needs. When making a purchase, it is necessary to pay close attention to the pressure rating, standard, connection method and material applicability to ensure the stability and reliability of the system.
