Charman Inc.
150# Black Malleable Iron Union
- Availability:
- Usually in Stock – Ships Quickly
- Weight:
- 0.00 LBS
Description
150# Black Malleable Iron Union
150# black malleable iron unions connect two male-threaded pipes, pipe nipples, or compatible fittings while allowing the piping connection to be separated without rotating or cutting the adjoining pipe. The three-piece threaded design includes two female NPT ends and a central union nut for convenient assembly, maintenance, and equipment removal.
Select the required nominal pipe size from the product options above. The selected variation determines the Charman item number, online selling price, weight, cost, and other size-specific product information.
Product Highlights
- 150# Class black malleable iron construction
- Female NPT x female NPT threaded connections
- Three-piece union design
- Central union nut allows disconnection without rotating adjoining pipe
- Ideal for equipment, valve, and maintenance connections
- Durable black finish
- Compatible with standard threaded black steel pipe and pipe nipples
- Available in nominal pipe sizes from 1/8" through 6"
- Suitable for commercial, industrial, maintenance, and repair applications
Technical Specifications
| Material | Black Malleable Iron |
|---|---|
| Pressure Class | 150# / Class 150 |
| Connection | Female NPT x Female NPT |
| Connection Sizes | Two Equal-Size Connections |
| Design | Three-Piece Threaded Union |
| Thread Standard | ASME B1.20.1 |
| Dimensional Standard | ANSI/ASME B16.3 |
| Finish | Black |
| Fitting Type | Threaded Pipe Union |
| Manufacturer | Charman Manufacturing |
| Available Sizes | 1/8" through 6" |
How a Pipe Union Works
Each end of the union threads onto a compatible male-threaded pipe, nipple, valve, or fitting. The central union nut draws the two halves together to complete the connection. When service is required, the union nut can be loosened so the piping can be separated without turning or cutting the adjacent pipe.
Common Applications
Plumbing and Mechanical Systems
- Valve connections
- Pump and equipment connections
- Mechanical-room piping
- Black steel pipe installations
- Serviceable piping assemblies
- General repair and maintenance
Industrial and Utility Service
- Industrial process piping
- Compressed-air systems
- Natural-gas piping
- Water and utility piping
- Oil and petroleum piping
- Approved low-pressure steam service
Product Resources
Review the Charman product catalog, Class 150 specifications, and manufacturer warranty information before installation.
Need Help Selecting a Black Malleable Iron Union?
Our industrial PVF specialists can help confirm the required pipe size, pressure class, thread type, service conditions, material compatibility, application requirements, and product availability.
Frequently Asked Questions
What is a black malleable iron union used for?
A threaded union joins two male-threaded components while allowing the connection to be separated later without rotating or cutting the adjoining pipe.
Does this union have female threads on both ends?
Yes. Both ends have female NPT threads for connection to compatible male-threaded pipe, pipe nipples, valves, or fittings.
How is a union different from a coupling?
A coupling permanently joins two threaded components unless one side can be rotated. A union has a central nut that allows the connection to be separated without rotating the adjoining pipe.
What pressure class is this fitting?
This black malleable iron union is manufactured as a 150# or Class 150 threaded fitting.
What sizes are available?
Available product variations range from 1/8" through 6" nominal pipe size. Select the required size from the product options above.
Can this union be used with black steel pipe nipples?
Yes. It is designed for compatible male NPT-threaded black steel pipe, pipe nipples, valves, and other approved threaded components.
Can it be used for gas, water, oil, air, or steam?
It may be used in compatible gas, water, oil, compressed-air, steam, and general-service systems when the application remains within applicable pressure, temperature, media, code, and manufacturer requirements.
Should thread sealant be used?
Use an approved pipe-thread sealant or thread tape on the male NPT connections. The union seat itself should be assembled according to manufacturer recommendations.
Can the union be disconnected repeatedly?
Yes, when properly installed and maintained, the union nut allows the connection to be separated for service or equipment replacement. Inspect the threads and seating surfaces before reassembly.
Important Ordering Notes
- Select the required nominal pipe size before adding the product to your cart.
- The selected variation determines the Charman item number, price, weight, and cost.
- This is an equal-size union with two female NPT connections.
- Confirm the nominal size and thread type of both mating components before ordering.
- Use an approved thread sealant suitable for the piping media and operating conditions.
- Keep the union seating surfaces clean and free of damage before assembly.
- Confirm pressure, temperature, media compatibility, and application requirements before installation.
- Support connected piping properly to avoid excessive mechanical stress on the union.
- Installation should be completed by qualified personnel and comply with applicable codes and standards.
- Manufacturer warranty coverage is subject to the terms, limitations, and exclusions in the linked warranty document.
