SS 321 BL Flange

QS Flange: Jiaxing SS 321 BL Flange

ASTM A182 F321 blind flange, 4 inch 150LB RF per ANSI B16.5, for blocking or temporarily blocking pipeline ends in corrosive service.

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One-Minute Overview

Solid A182 F321 stainless steel disk that closes a 4 inch flange joint.
Rated 150LB with a raised face, dimensioned to ANSI B16.5.
Forged body with high corrosion resistance for chemical and oil service.
Blocks a pipeline end for good, or just for the length of a job.

The SS 321 blind flange shuts a 4 inch joint with a solid plate instead of a matching pipe run. Forged from ASTM A182 F321 stainless steel, it brings high corrosion resistance to a pressure-boundary part, and every dimension follows ANSI B16.5 so the raised face mates with standard 150LB flanges on the line.

Name: SS 321 BL Flange
Size: 4"
Pressure: 150LB
Material: ASTM A182 F321
Flange Face: RF
Standard: ANSI B16.5
Type: BL
Process Method: Forged

Fit the blind at the end of a header, at a branch reserved for later tie-in, or across a valve during maintenance, so a section can be opened safely while the rest stays live. The forged A182 F321 body stands up to corrosive media and harsh environments in chemical, oil and gas and power service, which keeps the sealing face intact over repeated shutdowns. Bolt with stud bolting of the matching class, fit the gasket specified for the service, and tighten in a star pattern. Store the blind clean and protected between shutdowns so the face stays true.

FAQ

Q1. What makes this blind flange different from a plain carbon steel one?

The body is forged from ASTM A182 F321 stainless steel, which offers high corrosion resistance in harsh environments - the kind found in chemical processing, oil and gas, and power generation service. The plate keeps its sealing face instead of rusting, so the gasket does not have to fight corrosion at every shutdown.

Q2. Can I reuse it after the job is done?

Yes, that is the point of a blind. Bolt it in to block the end, unbolt it when the line goes back to service, and store it for the next shutdown. The forged steel body shrugs off repeated handling, and the RF face is easy to inspect and clean before refitting.

Q3. RF or FF - does it actually matter which face I order?

It matters to the gasket. This blind comes with a raised face (RF), which is the usual sealing surface for 150LB steel flanges. Match it to the flange on the line; if your joint is flat-faced, ask before ordering so the faces and the gasket agree.

Q4. What's the minimum I can order?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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