SABS 1123 Plate-Type Flat Flange

Overview

SABS 1123 Plate-Type Flat Welding Flange is a flat plate flange manufactured in accordance with South African Standard SABS 1123 (commonly referenced in South Africa and neighboring markets). It is produced from carbon steel or stainless steel plate through cutting and precision machining, with accurately drilled bolt holes and a machined sealing surface.

This flange type is widely used in water supply, fire protection, mining, HVAC, and general industrial pipelines, especially where projects specify SABS/SANS flange drilling patterns.

Product Description

ABS 1123 plate-type flat welding flanges are flat flanges without a hub, designed to be welded directly to the pipe end (flat welding). The standard defines the flange dimensions and drilling patterns under different pressure tables such as Table 1000 / Table 1600 / Table 2500 (depending on project requirements).

Because many South African projects strictly follow SABS/SANS drilling patterns, it is essential to confirm the required table (e.g., T1000), size, and facing type before manufacturing.

Typical specifications:

• Standard: SABS 1123

• Type: Plate-Type Flat Welding Flange

• Size range: DN15 – DN2000 (custom available)

• Tables: T1000 / T1600 / T2500 (as specified)

• Facing: FF (Flat Face) / RF (Raised Face) (as required)

• Materials: Carbon Steel, Stainless Steel

• Manufacturing process: Plate cutting + CNC machining

Flange production process

Factory Showcase

Installation Instructions

To ensure safe operation and reliable sealing, follow the steps below:

1. Verify Specifications
   Confirm size, table rating (D/E/F/H), material, and bolt pattern match the mating flange.

2. Inspect Flange Faces
   Ensure sealing surfaces are clean, smooth, and free from scratches or debris.

3. Select Suitable Gasket
   Choose gasket material based on pressure, temperature, and service medium
   (rubber, CNAF, PTFE, or spiral wound gasket).

4. Align Bolt Holes
   Position the blank plate flange accurately against the mating flange.

5. Tighten Bolts Evenly
   Use a cross-tightening sequence and apply torque gradually and uniformly.

6. Leak & Pressure Testing
   Conduct hydrostatic or pneumatic testing after installation to confirm sealing integrity.

Note: Always follow recommended torque values and gasket manufacturer guidelines.

FAQ

Q1: What does SABS 1123 mean?

SABS 1123 is a South African standard defining flange dimensions, drilling patterns, and pressure tables used in piping systems across South Africa.

Q2: What does “Plate-Type Flat Welding” mean?

It means the flange is a flat plate flange without a hub, and it is welded directly to the pipe end (flat welding), rather than being a slip-on hubbed flange or weld neck flange.

Q3: What are Table 1000 / 1600 / 2500?

These are SABS 1123 table classifications that define specific drilling patterns and pressure capability ranges.
They are not interchangeable, so the exact table must be confirmed before production.

Q4: Is SABS 1123 interchangeable with EN 1092-1 or ANSI flanges?

No. Even if pressure appears similar, bolt-hole drilling patterns and dimensions differ. Always follow the specified standard to avoid mismatch.

Q5: What facing types are available?

• FF (Flat Face) – common in waterworks and ductile iron systems

• RF (Raised Face) – used for steel piping systems depending on gasket design
  Confirm the gasket type and project requirement.

Q6: What typical applications use SABS 1123 plate-type flanges?

• Water supply and distribution

• Fire protection pipelines

• Mining and industrial plants

• HVAC and utility pipelines