Weldbend Carbon Steel 150# Blind Flange

Blind flange for bolted pipe connections. Blind flanges close off the end of a pipe, valve, or pressure vessel. Carbon Steel construction.

• Blind flange — 150# rated
• Carbon Steel body for durability and long service life
• Raised face per ASME B16.5 / B16.1 standard
• Mates with standard 150# flanges and flange fittings

Overview

Weldbend Carbon Steel 150# Blind Flange is a blind flange for bolted piping connections on water, steam, and industrial fluid systems. Blind flanges seal the open end of a pipe, nozzle, or pressure vessel — used for pressure testing, future connections, or permanently closing a line end. Flanges are fabricated to ASME B16.5 (150#) dimensional standards.

Common Uses

• Connecting pumps, valves, and equipment to flanged piping systems
• Water, steam, and industrial process fluid piping
• Closing pipe ends for pressure testing or future connections
• HVAC mechanical piping systems
• Municipal water and wastewater systems

Key Features

• Blind design — seals pipe ends for testing or permanent closure
• Carbon Steel construction
• 150# pressure class rating
• Raised face per ASME B16.5 / B16.1

Specifications

Frequently Asked Questions

What is the difference between a 150# and 300# flange?

150# flanges are rated for lower pressures and are the standard for most commercial water and HVAC applications. 300# flanges have thicker walls and are rated for higher pressures and temperatures.

What is the difference between weld neck and slip-on flanges?

Weld neck flanges are welded at the neck and provide superior strength for high-pressure and cyclic service. Slip-on flanges slide over the pipe and are fillet-welded — faster to fit but not as strong as weld neck.

What gasket do I need with a raised face flange?

Raised face flanges typically use a full-face or ring gasket. Spiral wound or ring-type joint gaskets are used on higher-pressure applications.

Are flanges supplied with bolts and gaskets?

Flanges are typically supplied individually — bolts, nuts, and gaskets are ordered separately based on service requirements.

Why Contractors Choose This Product

• Blind flanges let you pressure-test a system before all connections are made — standard practice in commercial construction
• 150# rating covers the pressure range for most commercial and industrial water and steam applications
• Carbon Steel construction for reliable long-term service
• PVFPro stocks the full range of flange types, sizes, and pressure classes