Merit Brass
150# Stainless Steel FF Weld Neck Flange Sch40 Bore
- SKU:
- 451-651
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
150# Stainless Steel Flat Face Weld Neck Flange Sch40 Bore
150# Stainless Steel Flat Face Weld Neck Flanges with Schedule 40 Bore are designed for welded stainless steel piping systems requiring a strong, permanent flange connection. The weld neck configuration uses a tapered hub and butt weld connection to transition pipe stresses gradually into the flange body, while the Schedule 40 bore is sized for compatible Schedule 40 piping.
These flanges are available in 304 and 316 stainless steel, use a 150# flange pattern, and feature an MSS flat-face configuration. Material conforms to ASTM A351, and the manufacturing facility is listed as ISO 9001:2008.
Product Highlights
- 150# stainless steel weld neck flange
- Schedule 40 bore
- MSS flat-face configuration
- Tapered hub weld neck design
- Designed for butt welding to compatible Schedule 40 pipe
- Available in 304 and 316 stainless steel
- Material conforms to ASTM A351
- Provides a strong permanent pipe-to-flange connection
- Flat-face sealing surface
- Corrosion-resistant stainless steel construction
- Suitable for commercial and industrial piping systems
- Manufactured in an ISO 9001:2008 facility
Technical Specifications
| Product Type | Weld Neck Flange |
|---|---|
| Pressure Class | 150# |
| Face Style | Flat Face (FF) |
| Flange Pattern | 150# |
| Bore | Schedule 40 |
| Material | Stainless Steel |
| Available Grades | 304 & 316 Stainless Steel |
| Material Standard | ASTM A351 |
| Pipe Connection | Butt Weld |
| Manufacturing Facility | ISO 9001:2008 |
Weld Neck Flange Construction
A weld neck flange uses an extended tapered hub that transitions gradually from the flange body to the connected pipe. The flange is butt welded directly to compatible piping, creating a permanent pipe-to-flange connection.
The tapered hub helps distribute mechanical stresses through the flange and adjoining pipe rather than concentrating them directly at the flange face.
This version is supplied with a Schedule 40 bore for compatibility with corresponding Schedule 40 piping dimensions.
Why Choose a Weld Neck Flange?
Strong Welded Connection
- Butt weld connection to compatible pipe
- Tapered hub transitions stresses into the piping
- Creates a permanent flange-to-pipe connection
- Suitable for demanding welded piping systems
- Provides dependable mechanical integrity when properly installed
Schedule 40 Bore
- Designed for compatible Schedule 40 piping
- Supports proper bore alignment with mating pipe
- Helps maintain a consistent internal flow path
- Important to match flange bore with pipe wall schedule
- Confirm dimensional compatibility before welding
Flat Face Flange Design
The flat-face sealing surface extends across the flange face rather than using a raised sealing area. This configuration is intended for use with compatible flat-face mating flanges and suitable gasket materials.
Proper gasket selection, mating flange compatibility, bolt pattern, bolt torque, and flange alignment are important for achieving a dependable bolted flange joint.
Weld Neck Flange vs. Slip-On Flange
Weld Neck Flange
- Butt welded directly to the pipe
- Uses a tapered hub
- Provides a direct transition between pipe and flange
- Bore should match the intended pipe schedule
- Commonly selected where a robust welded connection is preferred
Slip-On Flange
- Slides over the pipe before welding
- Allows easier positional adjustment before final welding
- Does not use the same tapered weld neck hub
- Different weld preparation and installation method
- Useful where simplified alignment is desired
304 vs. 316 Stainless Steel
304 Stainless Steel
304 stainless steel is commonly selected for general-purpose commercial and industrial piping systems requiring corrosion-resistant stainless steel construction.
316 Stainless Steel
316 stainless steel is commonly selected where increased corrosion resistance is required, including more demanding chemical, process, marine, or chloride-exposed service conditions.
Common Applications
Commercial & General Piping
- Water piping systems
- Mechanical piping installations
- Stainless steel utility piping
- Valve and equipment connections
- Permanent welded flange joints
Industrial & Process Applications
- Industrial process piping
- Chemical processing systems
- Water treatment applications
- Corrosion-resistant piping systems
- Equipment and vessel connections
Installation & Selection Guidance
- Confirm the required nominal flange and pipe size before ordering.
- Confirm that Schedule 40 bore is correct for the intended piping system.
- Select the appropriate 304 or 316 stainless steel grade for the operating environment.
- Verify the flange bore and pipe dimensions are compatible before welding.
- Confirm that the 150# bolt pattern matches the mating flange or equipment connection.
- Use a compatible flat-face mating flange and gasket.
- Use appropriate butt weld procedures for the stainless steel grade and piping system.
- Maintain proper flange alignment before completing the weld.
- Confirm bolt size, bolt pattern, and gasket requirements before final assembly.
- Use an appropriate flange bolt tightening sequence to achieve even gasket compression.
- Verify pressure, temperature, and media compatibility for the complete piping system.
- Installation should be completed in accordance with applicable piping codes, welding procedures, and project requirements.
Product Documents
Stainless Steel ANSI Flange Dimensions
Review the manufacturer dimensional reference for stainless steel flanges, including applicable weld neck flange dimensions, bore information, and bolt-pattern data.
Flange Selection Reference
Use the dimensional document to confirm nominal size, outside diameter, bolt circle, bolt-hole configuration, hub dimensions, bore, thickness, and other applicable flange dimensions before ordering.
Need Help Selecting a Stainless Steel Weld Neck Flange?
Our industrial PVF specialists can help review your pipe size, Schedule 40 bore requirement, stainless steel grade, flange pattern, mating flange, gasket, and welding requirements before you order.
Frequently Asked Questions
What is a weld neck flange?
A weld neck flange has an extended tapered hub and is butt welded directly to compatible pipe to create a permanent pipe-to-flange connection.
What pressure class is this flange?
This flange uses a 150# flange pattern.
What does FF mean?
FF means flat face. The sealing surface extends across the flange face rather than using a raised sealing area.
What does Schedule 40 bore mean?
Schedule 40 bore means the flange bore is configured for compatibility with corresponding Schedule 40 piping dimensions.
What stainless steel grades are available?
These flanges are available in 304 and 316 stainless steel.
What material specification applies?
The supplied product information states that the material conforms to ASTM A351.
Does a weld neck flange need to be welded?
Yes. The weld neck flange is designed to be butt welded directly to compatible pipe.
How is a weld neck flange different from a slip-on flange?
A weld neck flange is butt welded to the pipe through its tapered hub, while a slip-on flange slides over the pipe and is welded after positioning.
What gasket should be used?
Gasket selection depends on the mating flange, system media, pressure, temperature, and applicable piping requirements. Confirm that the gasket is suitable for a flat-face flange connection.
Where can I find flange dimensions?
Use the Stainless Steel ANSI Flange Dimensions document in the Product Documents section above.
Important Ordering Notes
- Product is a 150# stainless steel flat-face weld neck flange.
- Schedule 40 bore.
- MSS flat-face configuration.
- Available in 304 and 316 stainless steel.
- Material conforms to ASTM A351.
- Manufacturing facility is listed as ISO 9001:2008.
- Designed for butt welding to compatible Schedule 40 pipe.
- Confirm nominal flange and pipe size before ordering.
- Verify Schedule 40 bore compatibility with the intended pipe.
- Confirm the 150# bolt pattern matches the mating flange or equipment connection.
- Use a compatible flat-face gasket and mating flange.
- Verify system pressure, temperature, and media compatibility before use.
- Refer to the Stainless Steel ANSI Flange Dimensions document for applicable dimensional information.
