Spade Blind Flange

QS Flange: Fujian Spade Blind Flange

Spade blind flange in carbon, stainless, alloy or duplex steel, 1/2 to 56 inch, Class 150-2500, FF/RF, for isolating piping sections during maintenance.

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One-Minute Overview

Solid isolation plate that blocks a flange joint during maintenance, cleaning or repair work.
Sizes 1/2 to 56 inch, pressure classes 150 to 2500, flat or raised face.
Carbon, stainless, alloy and duplex steel bodies to match the pipe and the media.
Common in oil and gas, chemical, food and beverage, and water treatment piping.

The spade blind flange closes a piping section so it can be opened safely. This series runs from 1/2 to 56 inch and Class 150 to Class 2500, with FF or RF faces and bodies in carbon, stainless, alloy or duplex steel, built to ASME, ANSI, API, EN and BS.

Name: Spade Blind Flange
Size: 1/2"-56"
Pressure: Class 150 - Class 2500
Flange Face: FF/RF
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel
Standard: ASME, ANSI, API, EN, BS

Spade blinds go wherever a section must be positively blocked: at a pump or valve removal, ahead of a filter change, or across a line that stays live while work happens nearby. In oil and gas service they hold back high-pressure product; in chemical plants they let crews open a section without draining everything. Food and beverage and water treatment plants set them as a temporary barrier during cleaning and upgrades. Pick the body by media: carbon steel where budget and strength rule, stainless steel where corrosion or hygiene matters, alloy steel for high-temperature and high-pressure duties, duplex where both strength and corrosion resistance count. Match the face (FF or RF) and the pressure class to the mating flange and gasket, and bolt with the stud bolting of the same class, tightened in a star pattern.

FAQ

Q1. Which pressure classes and sizes does this spade blind cover?

The series runs from 1/2 to 56 inch and Class 150 to Class 2500, with FF or RF faces and bodies in carbon, stainless, alloy or duplex steel. The standard list — ASME, ANSI, API, EN and BS — describes the flange family used across oil and gas, chemical and water piping.

Q2. Where does a spade blind earn its keep on a live plant?

Anywhere a section has to be blocked without shutting the whole system: pump or valve removal, filter changes, tie-ins. Chemical plants use them so crews can open a section without draining everything, and water treatment and food plants set them as a temporary barrier during cleaning and upgrades.

Q3. Carbon, stainless, alloy, duplex — do I really have to think that hard?

Only about the media. Carbon steel covers budget-friendly general duty, stainless steel takes corrosive or hygiene-critical service, alloy steel handles high temperature and pressure, and duplex brings strength plus corrosion resistance together. Match the class and face to the mating flange and the choice mostly makes itself.

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. Blinds cut to your drawing or to a non-standard size are quoted individually, because the minimum really depends on the material and the tooling involved.

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