Stainless Steel Blind Flange

QS Flange: Suzhou Stainless Steel Bl Flange

Solid stainless steel blind flange that closes a pipe joint, used to blank line ends, branches and valve openings.

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One-Minute Overview

Solid stainless disc that closes a flange joint with no bore at all.
Used to blank a line end, a branch or a valve during maintenance.
Grade, thickness and facing are confirmed against your line on inquiry.
Stainless keeps the pressure boundary sound in wet and corrosive service.

A blind flange is a solid plate with a bolt circle and no bore, so it closes a joint rather than continuing the pipe. It bolts to a standard flange of the same size and pattern, compresses a gasket against its face, and turns an open end into a pressure tight boundary. Nothing in the line passes through it, which is why it is the part used at a header end, a spare branch, a manhole cover or an opened valve body.

The duty of a blind is pure pressure containment, so the plate has to be thick enough for the class it will see, and that thickness is confirmed per inquiry rather than read off a chart. Two habits keep a blind sound. First, the gasket has to sit on a flat, clean face and be centred on the bolt circle; a blind that is pulled down onto a damaged face will leak no matter how hard the bolts are run. Second, tighten in a star pattern in stages, because a solid disc gives no visual warning that one side is over compressed. Stainless construction earns its place where the outside sees washdown or coastal air and the inside carries water or a mild chemical, so the plate does not rust while it waits for the next shutdown. Where a blind will be opened regularly, a lighter handling weight and a tagged identification help the crew. Size, pressure class, facing and thickness are confirmed per inquiry, and detailed specifications are available on request.

FAQ

Q1. Where is a blind flange used instead of a cap?

A blind bolts to a flange and can be removed with hand tools, so it suits ends and branches that will be opened again. A cap is welded or threaded onto the pipe itself. If the joint has to come apart for inspection or a future tie in, the blind is the part that belongs there.

Q2. Does the blind need the same pressure class as the line?

Yes, and the class sets the plate thickness, the bolt circle and the facing. Confirm size, class and facing per inquiry so the blind matches the flange it bolts to; a blind from a lower class will not line up with the bolt holes.

Q3. Any trick to tightening a blind without a leak?

Clean both faces, centre the gasket, and bring the bolts up in a star pattern in two or three passes instead of one hard turn. A solid plate gives no warning before one side is over compressed, so the even pattern is what keeps the joint tight.

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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