Blind Flanges - Pumps, Valves, Piping and Fittings
Blind flanges are solid flanged discs used to terminate, isolate, or pressure-test shipboard piping systems. They are installed on marine pumps, valves, tanks, sea-water, ballast, bilge, fire-main, fuel, and other piping connections.
ProShipWorks provides end-to-end support to source and supply Blind Flanges for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.
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Product Information
| Product Name | Blind Flanges |
|---|---|
| Product Category | Pumps, Valves, Piping and Fittings |
| Product Reference | 631 |
| Brands / Manufacturers | Galperti, Metalfar, Klinger |
| Unit of Measure | Piece |
Key Features
| Key Feature |
|---|
| 1. Solid plate with no central bore |
| 2. Bolted connection for removal and inspection |
| 3. Available in raised-face, flat-face, and ring-type joint designs |
| 4. Manufactured in carbon steel, stainless steel, duplex steel, or alloy materials |
| 5. Pressure and temperature rating selected for the piping system |
Applications of Blind Flanges
| Application |
|---|
| 1. Blanking and isolating marine pumps, valves, and piping branches |
| 2. Pressure testing and hydrostatic testing of shipboard piping |
| 3. Termination of ballast, bilge, fire-main, seawater, fuel, and cargo systems |
Models & Manufacturers
| Model | Manufacturer |
|---|---|
| ASME B16.5 Class 150 Blind Flange | Galperti |
| ASME B16.5 Class 300 Blind Flange | Metalfar |
| EN 1092-1 Type 05 Blind Flange | Klinger |
Technical Specifications
| Model | Specification | Value | Unit |
|---|---|---|---|
| ASME B16.5 Class 150 | Pressure class | 150 | lb |
| ASME B16.5 Class 300 | Pressure class | 300 | lb |
| EN 1092-1 Type 05 | Flange type | Blind flange | — |
| ASME B16.5 | Nominal size range | NPS 1/2 through NPS 24 | — |
| ASME B16.47 | Large nominal size range | NPS 26 through NPS 60 | — |
Standards, Certifications & Class Approval
Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.
| Applicable Standards & Certification | Common standards include ASME B16.5, ASME B16.47, EN 1092-1, JIS B 2220, and ISO 7005. Material and inspection documentation may include EN 10204 type 3.1 certification. Gasket, bolting, pressure rating, facing, and dimensions must match the piping standard. |
|---|---|
| Class Approval | Use in classed vessels may require acceptance by DNV, ABS, Lloyd's Register, Bureau Veritas, or ClassNK, depending on the vessel system and approved piping design. Classification approval is generally project- and material-specific rather than inherent to every blind flange. |
Installation, Maintenance & Safety Information
| Installation Notes | Verify nominal size, pressure class, flange facing, material, bolt pattern, gasket type, and system design temperature. Clean mating faces, install the correct gasket, tighten bolts in a calibrated cross-pattern sequence, and perform the specified pressure or leak test. |
|---|---|
| Maintenance Tips | Inspect for corrosion, distortion, leakage, damaged threads, and gasket deterioration during planned maintenance. Replace gaskets after disassembly and renew fasteners when damaged, excessively corroded, or specified by the vessel maintenance procedure. |
| Safety Notes | Depressurize, drain, vent, and isolate the line before loosening bolts. Confirm zero pressure and safe temperature, particularly on fuel, steam, hydraulic, cargo, and seawater systems. Never remove a blind flange from a live or inadequately isolated system. |
Request a Quote for Blind Flanges
Contact ProShipWorks for marine or industrial product sourcing, quotations and delivery.
- Vessel name and IMO number
- ETA / vessel schedule
- Berth or vessel location
- Required quantity
- Preferred delivery window
- Shipping agent contact details
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