Basic Definition
Class 75 Tube Angle Ring Split Flanges are specially designed flanges used to connect tubes (rather than standard pipes). Their key features include:
Pressure Rating: Class 75 (working pressure: 75 psi, approx. 5.2 bar)
Structure: Split-type design, allowing installation around existing pipelines without disassembly
Connection Method: Features an angle ring design for stable flange face support
Key Features
(1) Split-Type Structure
Consists of two semicircular rings fastened with bolts
Suitable for pipeline systems that cannot be disassembled, facilitating maintenance or retrofitting
(2) Angle Ring Design
Equipped with an L-shaped angle ring to enhance structural strength
Provides better sealing surface support to prevent deformation
(3) Applicable Tubing (Tube)
Designed specifically for tubes (precision tubes, thin-walled tubes) rather than standard pipes (thick-walled pipes)
Commonly used in instrumentation tubes, hydraulic systems, pneumatic systems, etc.
Typical Applications
Petrochemical Industry: Connections for instrumentation tubes, sampling tubes
Power Industry: Boiler and heat exchanger fittings
Shipbuilding: Hydraulic and fuel pipelines
Food/Pharmaceutical Industry: Connections for sanitary-grade stainless steel tubes
Advantages
✅ No-Disassembly Installation: Can be directly installed on existing pipelines
✅ Cost Savings: Reduces downtime and maintenance costs
✅ Flexible Adaptation: Suitable for different tube diameters (must match corresponding specifications)
✅ Reliable Sealing: Ensures leak-proof performance when paired with gaskets (e.g., PTFE, spiral-wound gaskets)
Installation Precautions
⚠ High Alignment Requirement: The two flange halves must be precisely aligned to prevent leaks
⚠ Even Bolt Tightening: Bolts must be tightened gradually in a crisscross pattern
⚠ Gasket Selection: Choose appropriate gaskets based on the medium (gas/liquid/corrosive fluid)
Relevant Standards
ASME B16.5 (Flange standard, partially applicable)
ASTM A105 (Carbon steel material standard)
ANSI/ASME B16.48 (Standard related to split flanges)
