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Blind Pipe Flange
QS: Blind Pipe Flange
Name: Blind Pipe Flange
Material: CS
Manufacture Standard: ASME B16.5
Face: Raised Face
Class: 150LB
Size: 1/2 to 24 inch
Process: Forged Steel
Coating: Black Anti-rust Coating
Feature: Strong Stiffness
Usage: For Pipeline fittings, Industry, Pressure vessels, Electricity, etc
Material: CS
Manufacture Standard: ASME B16.5
Face: Raised Face
Class: 150LB
Size: 1/2 to 24 inch
Process: Forged Steel
Coating: Black Anti-rust Coating
Feature: Strong Stiffness
Usage: For Pipeline fittings, Industry, Pressure vessels, Electricity, etc
Quantity
The Blind Pipe Flange is made from carbon steel (CS) and strictly adheres to the ASME B16.5 standard. It features a Raised Face (RF) sealing surface, a pressure rating of 150LB, and sizes ranging from 1/2 to 24 inches. Manufactured using forged steel processes, it combines high strength with excellent rigidity. The surface is treated with a black anti-rust coating, providing strong corrosion resistance. The Blind Pipe Flange is widely used in pipeline fittings, industrial equipment, pressure vessels, and the power industry, making it an ideal choice for sealing pipeline ends or isolating systems.
In pipeline systems, the Blind Pipe Flange plays a critical sealing role, with its sealing performance directly impacting the safety and reliability of the system. Its sealing mechanism relies on the synergistic effects of bolt tightening force, flange sealing surface design, and gasket selection, ensuring long-term stable operation under rated pressure (e.g., Class 150LB).
1. Bolt Tightening Force: Uniform Preload Ensures Sealing
The Blind Pipe Flange is connected to the mating flange using high-strength bolts (e.g., ASTM A193 B7). The bolt preload must comply with ASME PCC-1 specifications to ensure uniform compression on the gasket.
The Blind Pipe Flange is connected to the mating flange using high-strength bolts (e.g., ASTM A193 B7). The bolt preload must comply with ASME PCC-1 specifications to ensure uniform compression on the gasket.
Typical torque values (for 1/2"Class 150LB):
M12 bolt (ISO 8.8 grade): Recommended torque 40-50 N·m
A cross-symmetrical tightening sequence is used, with force applied incrementally in three stages to prevent flange misalignment and leakage.
M12 bolt (ISO 8.8 grade): Recommended torque 40-50 N·m
A cross-symmetrical tightening sequence is used, with force applied incrementally in three stages to prevent flange misalignment and leakage.
2. Sealing Surface Design: Raised Face (RF) Optimizes Contact**
The RF design (1.6mm height for Class 150LB) increases the gasket contact area, combined with a surface roughness of 30-55 µin (0.8-1.4μm) to enhance friction and anti-slip properties.
Compared to flat face (FF) flanges, the RF surface of the Blind Pipe Flange improves sealing efficiency by over 30% in low-pressure conditions (≤150psi) (based on ASME B16.20 test data).
The RF design (1.6mm height for Class 150LB) increases the gasket contact area, combined with a surface roughness of 30-55 µin (0.8-1.4μm) to enhance friction and anti-slip properties.
Compared to flat face (FF) flanges, the RF surface of the Blind Pipe Flange improves sealing efficiency by over 30% in low-pressure conditions (≤150psi) (based on ASME B16.20 test data).
3. Gasket Selection: Matching Media and Operating Conditions
Non-metallic gaskets (e.g., rubber NBR/FKM):
Temperature range: -20°C to +100°C (NBR) / +200°C (FKM)
Pressure range: ≤10bar (150psi), suitable for non-corrosive media such as water and oil.
Semi-metallic gaskets (e.g., Spiral Wound Gasket):
Core material: 304SS + graphite/PTFE filler, temperature range -196°C to +650°C
Pressure capacity: Up to Class 600LB (approx. 100bar), suitable for high-temperature steam and acidic oil and gas.
Metal ring gaskets (Ring Joint Gasket):
Material: Soft iron/316L, used for high-pressure (≥Class 900LB) or highly toxic media, with sealing pressure exceeding 200bar.
Non-metallic gaskets (e.g., rubber NBR/FKM):
Temperature range: -20°C to +100°C (NBR) / +200°C (FKM)
Pressure range: ≤10bar (150psi), suitable for non-corrosive media such as water and oil.
Semi-metallic gaskets (e.g., Spiral Wound Gasket):
Core material: 304SS + graphite/PTFE filler, temperature range -196°C to +650°C
Pressure capacity: Up to Class 600LB (approx. 100bar), suitable for high-temperature steam and acidic oil and gas.
Metal ring gaskets (Ring Joint Gasket):
Material: Soft iron/316L, used for high-pressure (≥Class 900LB) or highly toxic media, with sealing pressure exceeding 200bar.
4. Sealing Verification Standards
ISO 5208 leakage level: The Blind Pipe Flange system must achieve Level B (≤0.1 bubble/min) or higher (e.g., Level A for demanding conditions) during testing.
Air tightness test: Typically conducted using a nitrogen pressure test at 1.1 times the design pressure, with a pressure drop of ≤1% over 30 minutes considered acceptable.
ISO 5208 leakage level: The Blind Pipe Flange system must achieve Level B (≤0.1 bubble/min) or higher (e.g., Level A for demanding conditions) during testing.
Air tightness test: Typically conducted using a nitrogen pressure test at 1.1 times the design pressure, with a pressure drop of ≤1% over 30 minutes considered acceptable.
Conclusion
The excellent sealing performance of the Blind Pipe Flange stems from its standardized design (ASME B16.5), precise torque control, and the triple assurance of compatible gaskets. It meets diverse requirements, from low-pressure water pipelines to high-pressure oil and gas pipelines.
The excellent sealing performance of the Blind Pipe Flange stems from its standardized design (ASME B16.5), precise torque control, and the triple assurance of compatible gaskets. It meets diverse requirements, from low-pressure water pipelines to high-pressure oil and gas pipelines.
The Blind Pipe Flange: A reliable sealing solution for pipeline systems!
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