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Overview
SABS 1123 Blind Flanges (Type 8) are manufactured in accordance with South African Standard SABS 1123, designed to close the end of pipelines, valves, or pressure vessel nozzles.
Featuring a solid plate construction with no central bore, Type 8 blind flanges provide secure isolation, reliable pressure containment, and long-term sealing performance.
These flanges are widely used in water supply, wastewater treatment, fire protection, mining, oil & gas, petrochemical, and industrial piping systems, particularly across South Africa and other African markets.
Product Description
A SABS 1123 Type 8 Blind Flange is a solid circular steel plate with precisely drilled bolt holes to match mating SABS 1123 flanges of the same pressure class.
Standard: SABS 1123
Type: Type 8 (Blind Flange)
Nominal Diameter: DN15 – DN600 (common range; larger sizes available on request)
Pressure Rating: PN10 / PN16 / PN25 / PN40 (depending on type and size)
Carbon Steel:
Mild Steel
ASTM A105
Q235 (or equivalent)
| Model Number: | SABA1123 |
| Standard: | SABA1123 PLATE TYPE3 600KBA 1000KBA 1600KBA 2500KBA 4000KBA FLANGE |
| Product name: | BLIND Flange |
| Material: | Carbon steel: CT20 Stainless steel: 12X18H10T, 10X17H13M2T |
| Pressure: | 600KBA 1000KBA 1600KBA 2500KBA 4000KBA |
| Technics: | Forged |
| Connection: | Welding |
| Surface Antirust: | Antirust light oil、 Black paint coating、Yellow paint coating or Red paint coating、Galnavized (Hot galvanized or Cold galvanized or Electro Galvanized) |
| Certificate: | ISO, CE, PED, BV, KS |
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Flange production process
Factory Showcase
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For safe installation and optimal sealing performance, follow these steps:
Check Specifications
Verify DN size, PN40 rating, material grade, and bolt pattern before installation.
Inspect Flange Faces
Ensure both flange faces and sealing surfaces are clean and undamaged.
Select Proper Gasket
Choose a gasket suitable for PN40 pressure and service media
(spiral wound, graphite, PTFE, or metal-reinforced gasket).
Align Bolt Holes
Position the blind flange accurately against the mating flange.
Tighten Bolts Evenly
Use a cross-tightening pattern and apply torque gradually and uniformly.
Pressure Test
Perform hydrostatic or pneumatic testing to confirm leak-free installation.
Tip: Always follow recommended torque values and gasket manufacturer instructions.
FAQ
Q1: What is SABS 1123 Type 8?
Type 8 refers to the blind flange design under SABS 1123, used to close pipeline ends or unused connections.
Q2: Can SABS 1123 blind flanges be used permanently?
Yes. They are suitable for both permanent sealing and temporary isolation, depending on system requirements.
Q3: Are SABS 1123 flanges interchangeable with EN or ANSI flanges?
No. SABS 1123 flanges differ in dimensions and bolt patterns and are not directly interchangeable with EN or ANSI standards.
Q4: Which gasket is recommended for SABS 1123 Type 8 blind flanges?
Gasket selection depends on PN rating and service conditions; graphite or metal-reinforced gaskets are recommended for higher pressures.
Q5: Are custom sizes, materials, or markings available?
Yes. Custom sizes, materials, coatings, and project-specific markings can be supplied upon request.
