What ASME standards apply to paddle blinds?

Paddle blinds manufactured by USA Industries conform to ASME B16.48 for sizes up to 24 inches, and ASME B16.47 Series A and B for sizes 26 inches and larger. Blind flanges conform to ASME B16.5 and B16.47.

What are the specialty blind options for venting and purging?

USA Industries manufactures three specialty slip blind configurations: the EZ Vent® blind (for controlled venting during isolation), the EZ Purge® blind (for nitrogen or inert gas purging), and the EZ Vent-Purge® Combo blind (which combines both functions in a single blind). These are ideal for hydrogen service, LNG, and any application where venting or purging is required during blind installation.

Pipe Isolation Blind Solutions | USA Industries

Storage Solutions

Inventory Storage Solutions

As piping isolation and testing product specialists, we are a leading manufacturer and supplier of inventory storage solutions — protecting your blinds, flanges, and valves on-site and in the field.

USA Industries offers a full line of EZ Store® and EZ Lock® storage racks, and custom storage solutions — keeping your piping isolation products organized, protected, and ready to deploy.

Storage Solutions

Paddle Bind, Blind Flange, & PSV Racks

Storage Solutions

EZ Lock Blind Rack®

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Storage Solutions

EZ Lock Blind Flange Rack™

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Storage Solutions

EZ Store Blind Flange Rack™ (Stackable)

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Storage Solutions

PSV Storage Racks

Small, Medium, Large & Custom PSV Rack

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Blind Specifications

Materials, Availability
& ASME Compliance

Materials & Availability

Alloy materials sourced from American mills
MTRs available upon request
Series "A" & Series "B" in stock
Any thickness, rating, and alloy available
Carbon steel blinds coated with black primer
Standard materials: SA516 Gr.70, 304 SS, and 316 SS

Manufacturing & Delivery

Rapid custom machining capability
Pickup or delivery options available

ASME Compliance

ASME B16.48

ASME B16.47 (>24")

ASME B16.5

ASME B16.2

EZ Vent-Purge · EZ Purge · EZ Vent — Hydroblind Solutions

Why USA Industries

The Gulf Coast's Largest Inventory
of Slip Blinds & Blind Flanges

Stocked & Ready to Ship

The largest ready inventory of paddle blinds, spectacle blinds, spacer blinds, and blind flanges in the Gulf region. Same-day shipping available on in-stock items.

Rapid Custom Machining

Any size, thickness, alloy, face type, handle configuration, or coating — built to your exact specs with rapid turnaround for planned and unplanned outages.

American Mill Material

All alloy sourced from American mills. MTRs available upon request. Standard stock in SA516 Gr.70, 304 SS, and 316 SS — any alloy available to order.

4 Locations. Buy or Rent.

Facilities in S. Houston TX, Corpus Christi TX, Prairieville LA, and Broken Arrow OK. Blind rental programs available — get what you need, return it when the job is done.

40+ Years in Business

ISO 9001:2015 Certified

24/7 Emergency Support

1/2"–96" Size Range

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Buying Guide

Which Blind Do You Need?

Paddle blinds, spectacle blinds, and blind flanges each serve distinct isolation and testing roles. Use this guide to match the right product to your application — or call us and we'll spec it for you.

Specification	Paddle Blind Line Blank / Blind Spade	Spectacle Blind Figure-8 Blind	Paddle Spacer Ring Spacer	Blind Flange Pipe Cap / End Cap	EZ Vent® Vented Blind	EZ Purge® Purge Blind
Best Use	Temporary isolation during maintenance or hydrostatic testing	Frequent switching between open and closed — both positions visible at all times	Holds flange spacing when blind is removed; used as a pair with paddle blind	Permanent or semi-permanent end closure of a piping run or pressure vessel nozzle	Controlled venting of trapped gas or pressure during blind installation and isolation	Nitrogen or inert gas purging through machined deep channels during isolation or line commissioning
Isolation Type	Positive shutoff	Positive shutoff	Open flow (spacer position)	Permanent or temporary closure	Positive shutoff with NPT or SW vent port	Positive shutoff with deep purge channel
Size Range	1/2" to 96"	1/2" to 96"	1/2" to 96"	1/2" to 96"	1/2" to 96"	1/2" to 96"
Pressure Classes	150# – 2500#	150# – 2500#	150# – 2500#	150# – 2500#	Ratable (additional thickness for vent)	150# – 2500#
ASME Standard	B16.48 / B16.47	B16.48	B16.48	B16.5 / B16.47	B16.48	B16.48
Rentable	✓ Yes	✓ Yes	✓ Yes	✓ Yes	✓ Yes	✓ Yes
Custom Options	Handle type, face, coating, alloy, RTJ	Handle type, alloy, face finish	Alloy, face finish, thickness	Face type, bore, alloy, hub style	Port count, NPT or SW, face type, RTJ, alloy, finish	Channel width (3/4", 1", 1-1/2"), alloy, coating

Industries Served

Trusted Across
Process Industries

Paddle blinds, spectacle blinds, and blind flanges are critical isolation components across high-demand process environments. USA Industries supplies and rents to facilities throughout the Gulf Coast and beyond.

Refineries

Paddle blinds and spectacle blinds are essential for turnaround and maintenance isolation across crude units, hydroprocessing, and FCC operations. Rental programs keep overhead low between outages.

Paddle Blinds Spectacle Blinds Blind Rentals

Petrochemical & Chemical Plants

Corrosive and high-temperature service demands exact alloy specification — 316 SS, Hastelloy, Inconel, or any required material. Custom blinds built to your process conditions.

Custom Alloys High-Temp Blinds RTJ Face Options

Power & Energy

Steam systems, cooling lines, and feedwater circuits require tight-tolerance blinds rated for elevated pressure and temperature. Full ASME compliance across all pressure classes.

High Pressure Steam Service ASME B16.48

Water & Wastewater

NSF ANSI/CAN 61 certified stainless steel blinds for potable water applications. Blind flanges and paddle blinds for municipal treatment, distribution, and pumping infrastructure.

NSF Certified SS Blind Flanges Paddle Blinds

Pharmaceuticals

Sanitary and clean-service environments call for polished 316L stainless blinds with full traceability. MTRs and certifications available for all pharma-grade orders.

316L SS MTR Included Polished Finish

LNG & Midstream

Cryogenic and high-pressure gas service demands precision-machined blinds in the right alloy and face configuration. EZ Vent® and EZ Purge® specialty blinds handle complex purge and vent requirements.

Cryogenic Service EZ Vent® EZ Purge®

Semiconductor & Data Centers

Ultra-pure process piping and cooling systems require cleanroom-compatible blind flanges with precise tolerances and full material documentation.

Blind Flanges 304 / 316 SS MTR Available

EPC & Industrial Contractors

Engineering and construction contractors rely on USA Industries for project-quantity orders with fast delivery, accurate certifications, and a single source for all blind and flange types.

Project Quantities All Blind Types Fast Delivery

A paddle blind — also called a line blind, blind spade, or line blank — positively isolates a section of piping during maintenance, turnaround, or hydrostatic testing. The solid disc is inserted between flanges to create a zero-leakage barrier, fully blocking flow and isolating downstream piping from the process.

A paddle blind is a single-piece disc inserted between flanges for isolation. A spectacle blind (figure-8 blind) combines a solid disc and an open ring in one piece, allowing operators to switch between open and closed positions without removing the blind entirely. Spectacle blinds are preferred where frequent switching is needed and visual confirmation of the blind position is important for safety.

Yes. USA Industries offers a full blind rental program covering paddle blinds, spectacle blinds, paddle spacer blinds, and blind flanges. Rental is available from our locations in S. Houston TX, Corpus Christi TX, Prairieville LA, and Broken Arrow OK. Renting eliminates the cost of purchasing, storing, and maintaining blinds you only need during scheduled outages or turnarounds.

Paddle blinds are available from 1/2" to 96" across ASME pressure classes 150#, 300#, 600#, 900#, 1500#, and 2500#. Custom thicknesses and non-standard ratings are available on request. Products conform to ASME B16.48 (up to 24") and ASME B16.47 Series A & B (26" and larger).

Standard stocked alloys include SA516 Gr.70 carbon steel, 304 SS, and 316 SS. Any alloy can be sourced to order — including 316L, Hastelloy, Inconel, Duplex, and others — for corrosive, cryogenic, or high-temperature service. All material is sourced from American mills, and MTRs are available upon request.

These are USA Industries' proprietary specialty slip blind designs. The EZ Vent® allows controlled venting during blind installation and isolation. The EZ Purge® enables nitrogen or inert gas purging through the blind. The EZ Vent-Purge® Combo combines both functions in a single blind. All three are ideal for hydrogen service, LNG, and any application requiring purging or venting during line blinding.

Paddle blinds conform to ASME B16.48 (up to 24") and ASME B16.47 Series A & B (26" and larger). Blind flanges conform to ASME B16.5 and B16.47. All products are manufactured to ASME dimensional and material requirements, and USA Industries is ISO 9001:2015 certified.

Buy or Rent Paddle Blinds, Specialty Blinds, Blind Flanges & Blind Storage

Paddle Blinds & Blind Flanges

Paddle Bind, Blind Flange, & PSV Racks