Carbon Steel 45# Blind Flange

QS Flange: CS 45 BL Flange

Forged 45# carbon steel blind flange, 2-1/2 inch 150LB, raised face to ASME B16.5, black anti-rust coated for water and utility line ends.

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One-Minute Overview

Forged 45# carbon steel blind flange for a 2-1/2 inch flange joint.
150LB class with a raised face, dimensioned to ASME B16.5.
Black anti-rust coating keeps the plate clean before it is fitted.
Strong stiffness and good sealing at the lower pressure bands.

The CS 45 BL flange is a 2-1/2 inch blind in 45# carbon steel, forged and finished with a raised face to ASME B16.5. At 150LB it belongs to the low pressure end of the range, which is where most water, drain and utility lines live, and where the cost of a forged blind against a fabricated cap is easiest to justify. The plate is solid, so nothing passes: the joint stays closed for as long as the blind is bolted in place.

Name: CS 45 BL Flange
Size: 2-1/2 Inch
Pressure: 150LB
Material: 45#
Flange Face: Raised Face
Process: Forged Steel Flange
Coating: Black Anti-rust Coating
Standard: ASME B16.5

Blanking a 2-1/2 inch line usually happens for one of three reasons: the branch is finished and capped, the section is going into a test, or the line will be extended later and the end has to stay closed until then. A blind flange handles all three with the same part, and unlike a welded cap it comes off again with a spanner. The 45# carbon steel body is forged, which gives the disc its stiffness and keeps the face flat across the bolt circle, so the raised face loads the gasket evenly instead of pinching one side.

The black anti-rust coating protects the outside of the forging in the yard and in damp plant rooms, and it is worth keeping intact until the joint is made. Clean the seating band, fit the gasket listed for the service, and tighten in a star pattern in two passes. On a 150LB water line the gasket usually decides the outcome, so match it to the medium rather than to what happens to be in the store, and check the face for rust or grit before the blind goes in.

FAQ

Q1. Blind flange or welded cap — what is the real difference?

Both stop the flow. A cap is welded on and cut off; a blind is bolted in and unbolted. If the end may be opened again, for a tie-in, an inspection or a test, the blind saves the cut and the re-weld and leaves the pipe end undamaged for the next joint.

Q2. 150LB sounds low. What does the class actually mean?

It is a class from ASME B16.5, not a pressure in pounds. What the flange will carry depends on the material and the design temperature, and the allowable falls as temperature rises. Read the rating table for the material you are buying at the temperature you run; that is the number to design against, not the label on the part.

Q3. Why 45# steel for a water line?

45# is the grade named on this page, and it is a carbon steel that forges into a stiff, flat disc. On water and utility duty the coating and the gasket do most of the work against corrosion. If the medium is aggressive or the line sits outdoors for years, say so when you enquire and the material question can be looked at properly.

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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