Haihao Group Delivers ASME B16.5 Blind Flanges with 1/2″ NPT Center Tapping for UK Customer
Haihao Group has successfully completed the production and shipment of a batch of ASME B16.5 blind flange with NPT tapping products for a customer in the United Kingdom. The order includes low-temperature carbon steel and stainless steel blind flanges designed for pressure piping systems that require secure sealing as well as instrument or vent connections through a precision-machined 1/2″ NPT center tapping.
Manufactured in accordance with ASME B16.5, these flanges meet the project’s dimensional and material requirements while ensuring excellent sealing performance and long-term reliability. One of the low-temperature carbon steel flanges was supplied with a 3.1 Material Certificate, providing complete traceability for project documentation.
Product Specifications
| Product | Size | Pressure Class | Material | Standard | Special Feature |
| Blind Flange RTJ | 1/2″ | Class 1500 | ASTM A350 LF2 Class 1 | ASME B16.5 | 1/2″ NPT Center Tapping + EN 10204 3.1 Certificate |
| Blind Flange RF | 2″ | Class 150 | ASTM A350 LF2 Class 1 | ASME B16.5 | 1/2″ NPT Center Tapping |
| Blind Flange RTJ | 1/2″ | Class 2500 | ASTM A182 F316L | ASME B16.5 | 1/2″ NPT Center Tapping |
ASME B16.5 Blind Flange with NPT Tapping for Reliable Pipeline Isolation
The ASME B16.5 blind flange with NPT tapping is widely used in oil & gas, petrochemical, offshore, and power generation projects where pipeline isolation and pressure monitoring are equally important.
Unlike conventional blind flanges, the machined 1/2-inch NPT center tapping allows users to install pressure gauges, vents, drain valves, or instrumentation without modifying the pipeline system after installation. For maintenance and commissioning, this design improves operational flexibility while maintaining the integrity of the flange connection.
For this UK project, the customer selected ASME B16.5 blind flange with NPT tapping products in multiple pressure classes and materials to match different service conditions throughout the piping system.
ASME B16.5 blind flange with NPT center tapping in ASTM A350 LF2 and ASTM A182 F316L manufactured by Haihao Group
Materials Selected for Different Operating Conditions
The shipment includes two premium materials that are commonly specified for critical industrial applications.
ASTM A350 LF2 Class 1
The ASME B16.5 blind flange with NPT tapping manufactured from ASTM A350 LF2 Class 1 is intended for low-temperature service where impact toughness is essential. This material offers:
- Excellent toughness at low temperatures
- Reliable mechanical performance
- Good weldability
- High structural integrity for pressure piping systems
ASTM A182 F316L Stainless Steel
For corrosive environments, the ASME B16.5 blind flange with NPT tapping produced from ASTM A182 F316L provides:
- Outstanding corrosion resistance
- Excellent resistance to chloride-containing media
- Low carbon content to reduce intergranular corrosion after welding
- Long service life in chemical and marine applications
Precision Manufacturing and Complete Quality Assurance
Every flange supplied by Haihao Group is manufactured under strict quality control procedures to ensure compliance with international standards.
Quality inspections include:
- Raw material verification
- Dimensional inspection
- Facing and machining inspection
- Thread inspection for 1/2″ NPT center tapping
- Surface quality examination
- Pressure class verification
- Material traceability
The ASTM A350 LF2 Class 1 RTJ blind flange was supplied with an EN 10204 3.1 Material Certificate, providing full documentation for project quality records.
Complete Flange Manufacturing Solutions from Haihao Group
Haihao Group has over 40 years of experience manufacturing industrial flanges and pipeline components for customers worldwide. Our production range includes carbon steel, stainless steel, duplex stainless steel, alloy steel, and nickel alloy products manufactured according to international standards.
Our main products include:
- Welding Neck Flanges
- Blind Flanges
- Slip-On Flanges
- Socket Weld Flanges
- Threaded Flanges
- Spectacle Blinds
- Orifice Flanges
- Customized Machined Flanges
Whether your project requires standard flanges or custom-machined products with threaded connections, pressure tapping, or special testing requirements, Haihao Group delivers reliable manufacturing quality and efficient global logistics.
Contact Haihao Group today for customized flange solutions tailored to your project specifications.