Blind Flanges | Stainless Steel & Aluminum

Blind flanges are used to seal the end of a piping system when flow needs to stop completely. With no center bore, they create a solid bolted closure that can be removed later for access, testing, inspection, or future expansion. That makes them a practical choice for shutdown points, hydro testing, spare outlets, capped nozzles, and other locations where a removable end connection is preferred over a permanent cap.

PipingNow offers this product type in 150#, 300#, and 600# classes, with 304L stainless steel, 316L stainless steel, and aluminum options available across the collection.

Pressure Classes, Materials, and Sizes

The assortment includes 150# options in stainless steel and aluminum, plus 300# and 600# options in stainless steel. 304L is a strong fit for many general stainless applications, while 316L is commonly chosen where added corrosion resistance is needed. Aluminum is a practical option for systems built around aluminum components or where lighter material is preferred.

Pressure classes: 150#, 300#, and 600#
Materials: 304L stainless steel, 316L stainless steel, and aluminum
Size range: 1/2 in through 24 in

Common Applications

These are typically used anywhere a line needs to be securely blanked off while still allowing the system to be reopened later. Common applications include isolating sections of piping for maintenance, sealing line ends during testing, closing vessel or equipment nozzles, and leaving room for future tie-ins or modifications.

isolation for maintenance
hydro testing
unused or spare outlets
equipment and vessel nozzles
future expansion points
inspection or modification access

What to Check Before Ordering

The most important step is matching the closure to the mating flange and service conditions. Pressure class, nominal size, facing, bolt pattern, and material all need to line up correctly. If one of those details is off, the flange may appear close but still fail to fit the system properly.

pressure class
nominal size
facing style
bolt hole pattern
material grade
mating flange compatibility
service environment and media

FAQs

What is a blind flange?
A solid flange used to close off the end of a pipe, valve outlet, fitting connection, or vessel opening.

What pressure classes are available?
This collection includes 150#, 300#, and 600# options.

What materials are offered?
304L stainless steel, 316L stainless steel, and aluminum.

What size range is available?
Sizes run from 1/2 in through 24 in.

When are they commonly used?
Typical uses include isolation points, hydro testing, shutdown work, capped nozzles, spare outlets, and future tie-in locations.

What should I match before ordering?
Match the pressure class, nominal size, facing, bolt hole pattern, material, and mating flange details.