Half Coupling vs Full Coupling
Table of Content
- What is Half Coupling?
- What is Full Coupling?
- Half Coupling and Full Coupling Difference
- Half Coupling vs Full Coupling Drawing
- Half vs Full Coupling Manufacturing Method
- How to Choose Half Couplings and Full Couplings for Your Application?
- Thread Types of Full vs Half Threaded Coupling
- End Connection of ASME B16.11 Coupling
- Uses and Applications of Half vs Full Coupling
- Welding Method of Half Coupling vs Full Coupling
- Advantages of Full and Half Coupling
- Materials Used in Half and Full Couplings
- Half Coupling vs Full Coupling Dimensions
- Differences Between Full Coupling and Half Coupling Weight
ASME B16.11 half coupling is designed to only connects one end of the pipe. Threaded half coupling require additional jointing materials like gaskets. Socket weld half coupling are generally used when connecting pipes in tight spaces. Half coupling can be flexible or rigid, and are constantly used in power transmission applications. Class 3000 full coupling is only socket weld or threaded at one end. other end of half coupling can be welded. Pipe half coupling come in size range 1/8″ to 4″ with 3000#, 6000#, 9000# pressure class.
ASME B16.11 full coupling is designed to connect two pieces of pipe together using a threaded connection or socket welding connection. Full coupling is normally used in small bore pipes such a oil & gas and power plants applications. Socket weld full coupling are normally used in applications where high levels of torque need. Threaded full coupling ends commonly in female of National Pipe (NPT Threads) or male and female British Standard Pipe (BSP Threads).
Half Coupling and Full Coupling Difference
| Feature | Half Coupling | Full Coupling |
| Structure | Connects single pipe | Connects two same diameter pipes |
| Material | Carbon and stainless steel, nickel alloy, copper nickel | Stainless and Carbon steel, alloy steel |
| Applications | High Pressure Applications | HVAC systems |
| Class | 2000#, 3000#, 6000#, 9000# | 2000 LB, 3000 LB, 6000 LB, 9000 LB |
| Wall Thickness | SCH 40, SCH 80 | SCH 40, SCH 80, and SCH 180 |
| Use | Creating branches from larger pipe | Connecting two pipes |
| Connection | Socket weld, threaded | Threaded, socket weld |
| Torque Capacity | Limited torque capacity | Superior torque capacity |
| Installation | More labor intensive | Flexible |
| Torque Capacity | Limited torque capacity | Superior torque capacity |
| Space Requirements | Best for confined spaces | More space required |
Half Coupling vs Full Coupling Drawing
Half Coupling
Full Coupling
Understanding Full Coupling and Half Coupling Manufacturing Process
Half vs Full Coupling Manufacturing Method
| Forging: | Casting: | Machining: |
| Made by round bar with heating and forging process | Melting the steel pouring and ingot | Machining allows for excellent surface finishes and high precision in both couplings |
Find Types Of Half vs Full Coupling Thread And Their Applications
How to Choose Half Couplings and Full Couplings for Your Application?
Thread Types of Full vs Half Threaded Coupling
| NPT | BSP | BSPP | NPSM | CHT |
|---|---|---|---|---|
| National Pipe Thread | British Standard Pipe | British Standard Pipe Parallel Thread | American Standard Straight Mechanical Joints | American Standard Fire Hose Thread |
| NPTF | BSPT | UNF | GHT | JIC |
| National Pipe Thread Fuel | British Standard Pipe Taper Thread | Unified National Fine Thread | Garden Hose Thread | Joint Industrial Committee |
End Connection of ASME B16.11 Coupling
Threaded Half Coupling
Threaded Full Coupling
Socket Weld Half Coupling
Socket Weld Full Coupling
Uses and Applications of Half vs Full Coupling
| Half Coupling Applications | Full Coupling Applications |
| High Pressure Applications | HVAC systems |
| Compact Systems | Gas Lines |
| Vessel or Tank Connections | High Pressure Systems |
| Pumps and Compressors | Industrial Use |
| Marine Applications | Worn out Pipes Repairing |
| Water Systems | Straight Line Connections |
Welding Method of Half Coupling vs Full Coupling
PAW Welding
GTAW Welding
SMAW Welding
Advantages of Full and Half Coupling
| Advantages of Half Coupling | Advantages of Full Coupling |
| Easy to remove and install | High levels of torque |
| Only have one hub | Have two hubs |
| Less expensive | More durable |
| Have fewer parts | Have less moving parts |
Learn More About Half Coupling and Full Coupling Welding and Materials
Materials Used in Half and Full Couplings
| Materials | Uses |
| Carbon Steel Couplings | Oil refineries |
| Stainless Steel Couplings | Food and pharmaceutica |
| Alloy Steel Couplings | Mechanical pipelines |
| Brass Couplings | Gas line applications |
| Copper Couplings | Hot and cold water piping systems |
Half Coupling vs Full Coupling Dimensions
| Normal Pipe Sizes | Outside Dia | Length | Thread Length (Min) | |
| D | A | J | B | |
| 4 | 140 | 121 | 33 | 27.7 |
| 3 | 108 | 108 | 30.5 | 25.9 |
| 2.1/2 | 92 | 92 | 28.9 | 23.6 |
| 2 | 76 | 86 | 19.2 | 19 |
| 1.1/2 | 64 | 79 | 18.4 | 17.8 |
| 1.1/4 | 57 | 67 | 18 | 17 |
| 1 | 44 | 60 | 17.3 | 14.7 |
| 3/4 | 35 | 51 | 13.9 | 12.7 |
| 1/2 | 28 | 48 | 13.6 | 10.9 |
Differences Between Full Coupling and Half Coupling Weight
| NPS | Class 3000 Threaded Full Coupling (KG) | Class 3000 Threaded Half Coupling (KG) |
| DN100 | 7.8 | 3.9 |
| DN80 | 4.25 | 2.1 |
| DN65 | 3 | 1.5 |
| DN50 | 1.65 | 0.83 |
| DN40 | 1.26 | 0.63 |
| DN32 | 0.86 | 0.43 |
| DN25 | 0.55 | 0.28 |
| DN20 | 0.3 | 0.15 |
| DN15 | 0.22 | 0.11 |
| DN10 | 0.11 | 0.06 |
| DN8 | 0.08 | 0.04 |
| DN6 | 0.06 | 0.03 |