ASME B16.5 BL Flange

QS Flange: Huaian ASME B16.5 BL Flange

Forged A182 F304 blind flange, 4 inch 150LB RF with 125-250 AARH finish per ASME B16.5, for terminating a piping system with a solid, gasket-tight end.

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One-Minute Overview

Forged ASTM A182 F304 blind flange that terminates a 4 inch piping run with a solid plate.
Rated 150LB with an RF face finished to 125-250 AARH for a dependable gasket seal.
Dimensions follow ASME B16.5 so it mates with standard 4 inch Class 150 flanges.
Common in chemical, pharmaceutical and food processing lines that need a sealed, removable line end.

The ASME B16.5 BL flange closes a 4 inch pipe run with a solid forged plate instead of a continuing line. Made from ASTM A182 F304 (SS304) austenitic stainless steel, it brings the corrosion resistance of 304 into a pressure-boundary part. The raised face is machined to a 125-250 AARH serrated finish so the gasket bites evenly, and every dimension follows ASME B16.5 for Class 150 joints.

Name: ASME B16.5 Blind Flange
Size: 4"
Pressure: 150LB
Material: SS304, ASTM A182 F304
Flange Face: RF AARH 125-250
Process: Forged
Standard: ASME B16.5
Usage: Terminate a piping system

Blind flanges of this class typically terminate a header, blank off a spare branch, or isolate a section across a valve during maintenance. The AARH 125-250 serrated facing suits the spiral-wound and flat gaskets normally used on 150LB joints; match the gasket to the media. Bolt it with the stud bolting of the adjoining flange and tighten in a star pattern so the face load stays even. The forged F304 body keeps its toughness in cold weather and handles the cleaning cycles common in pharmaceutical and food lines.

FAQ

Q1. Which standard governs the dimensions and facing of this blind flange?

ASME B16.5 covers the dimensions, pressure class and raised-face requirements, so the blind mates with any standard 4 inch Class 150 flange. The 125-250 AARH serrated finish on the raised face is the usual facing for this class and gives flat and spiral-wound gaskets an even sealing surface.

Q2. Why does the face finish matter on a blind flange?

The 125-250 AARH serrations give the gasket something to grip. A smooth face can let a gasket creep under pressure and temperature cycling, while a properly roughened raised face keeps the joint tight — which is why the finish is specified right along with the size and class.

Q3. Can I just bolt a plate onto the pipe end and call it a day?

Tempting, but no. This blind is forged and dimensioned to ASME B16.5 for a reason: a flat plate without the right thickness, bolt circle and facing concentrates stress at the joint and gives gaskets nothing to seal against. Use a rated blind and the leak stays where it belongs — nowhere.

Q4. What is the smallest order I can place?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Flanges 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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