flat face flange

flat face flange

Flat Face Flange (FF) from Locus is a high-quality forged/cast flange used to connect pipes, valves, pumps, and other equipment to form a piping system. It provides a reliable and leak-proof connection for low-to-medium pressure applications.

Brand: LOCUS
Material: Mild Steel / Carbon Steel / Stainless Steel / Cast Iron
Sizes Available: ½” to 48” (DN15 to DN1200)
Standards: ANSI / ASME B16.5 / DIN / BS / IS
Pressure Ratings: PN10, PN16, PN25, PN40 / Class 150–600
Finish: Machined, Painted, Galvanized
Manufacturing Type: Forged / Cast
Coating Options: Zinc Plated / Epoxy / Black Paint
Certification: ISO 9001:2015, CE, Material Test Certificate
End Type: Flat Face (FF)

Description

1. Product Description

The Flat Face Flange (FF) from Locus is a high-quality forged/cast flange used to connect pipes, valves, pumps, and other equipment to form a piping system. It provides a reliable and leak-proof connection for low-to-medium pressure applications. The flat face ensures full face contact between flanges, minimizing uneven stress and reducing the risk of warping, especially with cast iron components.

2. Specifications

Specification	Details
Material Grade	ASTM A105, ASTM A182 F304/F316, IS 2062
Type	Flat Face Flange
Pressure Rating	PN10 to PN40 / Class 150 to 600
Size Range	½” to 48” (DN15 to DN1200)
Bolt Hole Pattern	As per standard (ANSI/DIN/IS)
Surface Finish	Smooth machined face (Ra ≤ 3.2 µm)
Thickness	As per pressure rating & standard

3. Working

Flat face flanges work by providing a flush surface for sealing against another flat face flange using a full-face gasket. They are bolted together, and the even contact surface ensures uniform gasket compression, minimizing the chance of leakage.

4. Principle

The sealing principle behind flat face flanges is the uniform surface contact between two mating flat surfaces. A full-face gasket is compressed between them, creating a tight seal through bolted pressure without grooves or raised surfaces. Ideal where flange deformation must be avoided.

5. Assembly Instructions

Clean both flange faces and gasket.
Align bolt holes and insert gasket.
Insert bolts diagonally and hand-tighten.
Tighten bolts using a crisscross pattern with a torque wrench.
Perform hydro or pneumatic testing (if required).

6. Installation Process

Ensure pipe ends are prepared and aligned.
Place the full-face gasket on the flange.
Mate the flat face flanges and secure using bolts.
Use washers under nuts/bolts to distribute pressure.
Tighten as per torque chart to avoid gasket failure.
Verify alignment after tightening.

7. Technical Specifications

Property	Value
Temperature Range	-20°C to 400°C (material-dependent)
Pressure Capacity	Up to 600 PSI
Tensile Strength	≥ 485 MPa (ASTM A105)
Corrosion Resistance	High (with SS or Coated Mild Steel)
Flatness Tolerance	±0.2 mm
Surface Finish	Ra ≤ 3.2 µm

8. Troubleshooting

Problem	Possible Cause	Solution
Leakage at joint	Gasket damage or misalignment	Replace gasket and align properly
Uneven tightening or warping	Improper torqueing	Use torque wrench in crisscross pattern
Bolt breakage	Over-tightening or corrosion	Use proper torque and anti-corrosion bolts
Misalignment	Uneven surface or poor fitting	Check flange face and pipe alignment

9. HS Code (for Export)

HS Code: 73072100
Description: Flanges of Iron or Steel (For Pipes or Tubes)

10. Frequently Asked Questions (FAQs)

Q1: Can Flat Face Flanges be used with Raised Face Flanges?
🅰️ It’s not recommended. Use FF to FF for proper sealing and to prevent cracking.

Q2: What gasket should be used?
🅰️ Use full-face gasket made of rubber, PTFE, graphite, or CAF based on application.

Q3: Can LOCUS provide MTC or third-party inspection?
🅰️ Yes. We offer Material Test Certificate, and Third-party Inspection on request (TUV, BV, SGS).

Q4: Are stainless steel flat face flanges available?
🅰️ Yes. We provide SS304, SS316 options with mill test certificates.

Q5: What is the minimum order quantity (MOQ)?
🅰️ MOQ is 50 pieces, with custom branding and packaging available.

11. Applications