Key facts
- Size range: 1/2″ – 24″
- Pressure class: CL150 – CL2500
- Face type: RF / RTJ / FF
- Standard: ASME B16.5, B16.47
- Material: ASTM A105, A350 LF2, A182 F316L
- Marking: Size, class, heat number, standard
Blind Flange — Overview
A blind flange closes off a pipe end, a valve or a vessel nozzle. It is used for hydrostatic testing, for tie-in points that will be opened later, and for isolating a line during maintenance.
We machine the face and drill the bolt holes to the standard so the blind mates with the flange it is bolted to, first time.
Each piece carries its size, class and heat number, which lets your inspector match the plate straight back to the certificate.
Blind Flange Specification
Standard range below. Anything outside it can be quoted on request — send the size, class and quantity you need.
| Standard | ASME B16.5 / ASME B16.47 |
|---|---|
| Size range | 1/2″ to 24″ to B16.5; larger on request |
| Pressure class | CL150, 300, 600, 900, 1500, 2500 |
| Face type | Raised face (RF), ring joint (RTJ), flat face (FF) |
| Connection | Bolted to a mating flange; no bore |
| Material grades | A105, A350 LF2, A182 F304/L, F316/L |
| Surface | Anti-rust oil or black paint |
| Marking | Size, class, standard and heat number on the rim |
| Packing | Fumigated wooden cases, seaworthy marking |
| Certificate | EN 10204 3.1 mill test certificate |
Material Grades We Stock
Carbon, low-temperature, alloy and stainless grades, all supplied with an EN 10204 3.1 mill test certificate.
Where It Is Used
The three project types that order this item most often.
Oil & Gas
Upstream and midstream lines, wellhead hook-ups and pipeline tie-ins where pressure classes run high.
Water & Desalination
Desalination plants, pumping stations and water transmission lines, in carbon or stainless steel.
Power & Process
Power plants, refineries and chemical process piping where heat resistance and traceability matter.
Send Us Your Specification
Size, standard, class and quantity is all we need. You will have prices, lead time and packing details within one working day.