Blind flange
The blind flange (EN 1092-1 Type 05, BL) closes pipe ends, nozzles and valves pressure-tight – with an undrilled sealing face and bolt holes on the rim. ROHRLINE supplies flanges of this type in carbon and stainless steel to EN 1092-1 and ASME B16.5 with EN 10204 3.1 inspection certificates – worldwide.
Application & design
The blind flange (EN 1092-1 Type 05, BL) closes pipe ends, nozzles and valves pressure-tight – with an undrilled sealing face and bolt holes on the rim.
- Closing pipe ends and nozzles
- Inspection and test openings
- Reserve outlets for later extension
- Vessel and apparatus construction
Technical overview
Standardised reference data. Please ask for availability of individual sizes and pressure ratings.
| Feature | Detail |
|---|---|
| Standards | EN 1092-1 (type 05), DIN 2527 |
| EN 1092-1 type | 05 |
| Pressure ratings | PN 6 – PN 400 |
| Sealing faces | Form B1/B2 (RF) |
| Nominal sizes | DN 10 – DN 1200, larger sizes on request |
| ASME equivalent | ASME B16.5 BL |
We supply Blind flange to EN 1092-1, DIN and ASME – matched to pipe, material and pressure rating, on request with an EN 10204 3.1 / 3.2 mill certificate.
Flange dimensions PN 10 / PN 16
Outside diameter D, bolt circle K and bolts per nominal size to EN 1092-1 – applies to Blind flange in PN 10 and PN 16 (identical up to DN 150). Other pressure ratings: flange dimension table.
| DN | Outside Ø D (mm) | Bolt circle K (mm) | Bolts (n × size) |
|---|---|---|---|
| DN 15 | 95 | 65 | 4 × M12 |
| DN 20 | 105 | 75 | 4 × M12 |
| DN 25 | 115 | 85 | 4 × M12 |
| DN 32 | 140 | 100 | 4 × M16 |
| DN 40 | 150 | 110 | 4 × M16 |
| DN 50 | 165 | 125 | 4 × M16 |
| DN 65 | 185 | 145 | 8 × M16 |
| DN 80 | 200 | 160 | 8 × M16 |
| DN 100 | 220 | 180 | 8 × M16 |
| DN 125 | 250 | 210 | 8 × M16 |
| DN 150 | 285 | 240 | 8 × M20 |
Frequently asked questions about Blind flange
When is a blind flange fitted?
When a pipe end, a nozzle or a valve has to be closed pressure-tight – for a later extension, for testing or during an outage.
Which pressure ratings are available?
EN 1092-1 Type 05 from PN 6 to PN 400, or ASME B16.5 Class 150 to 2500.
Is a blind flange drilled?
The sealing face is undrilled; only the bolt holes on the rim are present.
Request Blind flange?
Type, size, pressure rating, sealing face and material are enough – we supply the right flange, on request with an EN 10204 3.1 / 3.2 mill certificate.
All data are typical values per EN 1092-1 / DIN / ASME for first orientation – without warranty. Please ask for the availability of individual sizes and pressure ratings. The applicable standard and the order confirmation are decisive.