A182 F321 BL Flange

QS Flange: Yuyao A182 F321 BL Flange

Forged SS 321 blind flange, 4 inch 150LB RF per ANSI B16.5, built to block pipeline ends in hot and chemical service.

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One-Minute Overview

Forged SS 321 blind flange that blocks a 4 inch ANSI B16.5 flange joint.
Rated 150LB with a raised face for a tight, leak-free closure.
SS 321 stainless steel suits high-temperature and chemical exposure.
Common in chemical, petrochemical, oil, gas and power piping.

The A182 F321 blind flange shuts a 4 inch joint with a solid forged disk instead of a matching pipe run. Forged from SS 321 stainless steel and dimensioned to ANSI B16.5, it mates with standard weld neck, slip on and socket weld flanges of the same size and 150LB class. The raised face accepts the usual 150LB gasket arrangements, so the closure uses the same bolting pattern as the rest of the line.

Name: A182 F321 BL Flange
Size: 4"
Pressure: 150LB
Material: A182 F321 (SS 321)
Flange Face: RF
Standard: ANSI B16.5

SS 321 is a sensible pick where the line runs hot or carries chemicals, and the same toughness earns its place in petrochemical, oil, gas and power service. Fit the blind at a header end, at a future branch point or across a valve for maintenance isolation. Bolt with stud bolting of the adjoining class and tighten evenly in a star pattern to the gasket guidance. A gasket matched to the medium keeps the face tight between openings.

FAQ

Q1. What is this blind flange made of, and where does it fit best?

The disk is forged from SS 321 stainless steel and dimensioned to ANSI B16.5 as a 4 inch 150LB blind with a raised face. It fits low-pressure lines that run hot or carry chemicals — chemical, petrochemical, oil, gas and power piping are typical services.

Q2. Can I bolt it on to block a line and then take it off again?

Yes. A BL flange is made to block or temporarily block the end of a pipeline, so bolt it across the joint for maintenance or tie-in work, then remove it and restore the line. Inspect the face and replace the gasket before refitting.

Q3. Does corrosion resistance really matter on a part that just sits there?

It sits there longer than almost anything else in the line and sees whatever the medium and the weather do to it. SS 321 resists corrosion in chemical service and high temperature, so the closure stays clean and the pressure boundary sound between openings.

How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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