SS 316 BL Flange

QS Flange: Zhejiang SS 316 BL Flange

ASTM A182 F316 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 F316 stainless steel disk that blocks a 4 inch flange joint.
Rated 150LB with a raised face, dimensioned to ANSI B16.5.
A182 F316 stainless steel resists corrosion in chemical and outdoor service.
Install at a pipeline end that must be closed or temporarily blocked.

The SS 316 blind flange closes a 4 inch piping joint with a solid plate. Forged from ASTM A182 F316 stainless steel and dimensioned to ANSI B16.5, it blocks the end of a pipeline or temporarily closes a section while keeping the pressure boundary intact. The raised face matches standard 150LB flange facings, so the blind mates with the flanges already on the line.

Name: SS 316 BL Flange
Size: 4"
Pressure: 150LB
Material: ASTM A182 F316
Flange Face: RF
Standard: ANSI B16.5
Type: BL
Process Method: Forged

Blind flanges sit at the end of a header, at a future branch, or across a valve during maintenance so a section can be opened safely. A182 F316 stainless steel is chosen where the line carries corrosive media or the joint faces chemicals and high humidity, since that corrosion resistance keeps the sealing face sound. Bolt with stud bolting of the matching 150LB class, fit the gasket specified for the service, and tighten in a star pattern to the gasket maker's guidance. Keep the stored blind clean and capped so the face stays ready for the next shutdown.

FAQ

Q1. Which standard governs this blind flange's dimensions and facing?

Every dimension, the raised-face finish and the 150LB rating follow ANSI B16.5. The standard also fixes the bolt circle and drilling, so the 4 inch blind mates directly with standard weld neck, slip on and socket weld flanges of the matching class - no adapter and no special gasket needed.

Q2. Where does a blind flange like this actually go?

At the end of a header, at a branch that will be tied in later, or across a valve during maintenance. Anywhere a section must be closed off - permanently or just for the job - the blind bolts between the flange faces and blocks the line until you bolt it out again.

Q3. Why pay for 316 when 304 exists?

Because some lines do not read the price list - they carry corrosive media, or the joint sits out in chemicals and high humidity. A182 F316 resists corrosion well in that service, so the sealing face stays smooth and the gasket lasts instead of fighting rust at every shutdown.

Q4. What payment terms do you accept?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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