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Balcombe Engineering Pty. Ltd.
25-26 National Drive
Hallam, Vic 3803
Ph: 61 3 9554 0900
FAX: 61 3 9554 0999
Email: sales@baleng.com.au

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  • Size Range : 15mm- 1500mm (1/2”- 60”)
  • Ratings : As described in the relevant standard including ASME B16.5, ASME B16.47, EN1092, AS2129, AS/NZ 4087, API Spec 6A
  • Sealing Type: flat face, raised face, ring joint
  • Sealing Finish: Spiral Finish 3.2µm-12.0µm
  • Materials: A105, A350LF2,LF3,LF6, A694 F42-F70, AS/NZS3678 Gr250 304,316, 2205 (A182 F51), 2207, Incolloy 625 or as requested
  • Custom items: delivery usually 10-20 days.
  • Varietys: Weldnecks, Blinds, Slip-ons, Socket Welds, Lapped, Long Weldnecks. See visualise types under technical references to identify these types.

Flanges is a generic description used to describe a device that terminates a pipe or device and provides a boltable joint. The concept is generic but the application is specific. Flanges are predesigned to meet process conditions. Standards exist that provide standardised dimensions and material types.

Flange Types: Weldneck, Slip-on, Blind

Typical flange types are as follows:

Slip-on Weld (SOW) – This flange is slipped over the pipe and a bead of weld placed around the inside at the sealing face and the outside at the neck.

Weld Neck (WN) – Attached with a full penetration butt weld to the pipe. Very common in ASME B16.5 and sometimes called an ASME Weldneck or ANSI Weld neck.

Blind – Terminates the line.

Other types of flanges include: Long Weldneck, Bossed Blind, Lapped Flanges, Stub Ends, Socket Weld and Screwed. Typical sealing variations include Raised Face, flat face and Ring Joint.

Different industries tend to be dominated by different standards. The following chart illustrates the industries where the standards are used.

Australian Standard
Flanges for piping valves & fittings
A common industrial flange in Australia. Sold mostly with a spiral finish on a flat face. Used for water movement and general industrial fluids, including in the food and wine industry.
Australian and New Zealand Standard
Metallic flanges for waterworks purposes
Used generally for water supply projects for government sponsored projects. Similar hole spacings to some AS2129 flanges
ASME B16.5
American Society of Mechanical Engineers
Pipe flanges & flanged fittings
This is the mainstay for most heavy industrial and petrochemical plants. Covers flanges up to 600mm typically supplied with a raised face and spiral finish
ASME B16.47
American Society of Mechanical Engineers
Large diameter steel flanges Found mostly in heavy industrial and petrochemical applications. Covers flanges above 600mm typically supplied with a raised face and spiral finish. Available in A and B type.
BSEN 1092-1
British Industrial Flanges
Flanges & their joints.
Found on DIN pumps and other equipment from Europe and the UK
NB similar BS4504
JIS B2220
Japanese Industrial  Standard
Steel pipe flanges.
Seen mostly in Australia in ships
ASME B16.36
American National Standard
Orifice Flanges. These flanges are designed to sit either side of orifice plates for measuring flow. They will typically be supplied with a side port and jacking bolts.
ASME B16.48
American National Standard
Line Blanks
Spectacle Blinds, Fig 8 Blinds, Spades, Paddle blinds, Spacers
American Manufacturing standardisation Society
Steel Pipeline Flanges.
Similar ASME B16.47A
American Water Works Association
Steel Pipe Flanges for Waterworks.
Some flanges have similar hole spacing to ASME B16.47A
API 605
American Petroleum Institute
Large Diameter Carbon Steel Flanges
Similar ASME B16.47B


Typically Weldnecks, Slip-ons, and Blinds are produced as a raised face, flat face, or ring joint sealing surface depending on the application requirement. The spiral sealing face is a specified finish typically
Ra 3.2µm-6.3µm.

Australian and New Zealand flange standards specify coarser sealing faces typically Ra 6.4µm-12µm.


As an Australian manufacturer Balcombe Engineering are able to manufacture the spectacle blinds in a material with the testing as required by the client specification. Typically flanges will be manufactured from carbon or stainless steels. Typical carbon steel materials are AS1548 460NR, A516 Gr70 or forgings like A105, A350 LF2, A350 LF3. In corrosion resistant materials A240 P316L, A240 P304L, UNS31803 and A182 F316L, A182 F304L are common. Less common but easily supplied is Super Duplex 2207 and Incoloy 625.

Additionally specialist finishes are available such as galvanising, PTFE coatings and linings and various epoxy finishes.

FLANGES - Corrosion Protection and Packaging

Each Flange will always have a sealing face that requires protection. Weldnecks have an additional weld preparation that also requires protection. Whether you want the flanges preserved for 2 weeks or 2 years Balcombe Engineering have packing system that ensures that your Weldneck, Slip-on and Blinds arrive at the installation in good condition. Even more robust corrosion protection can be supplied upon request.


This photo shows the early machining of a self-reinforced weldneck from A182 F51 duplex material.

Sometimes a specific engineering requirement may dictate the need for special material and construction type required to produce the Weldneck , Slip-on or Blind flange. Balcombe Engineering are a manufacturer with full ISO 9001 certification and are able to produce to your requirements including detailed testing and documentation.
All material is traced through the system and ITP’s and MDR’s are available on request.
Your flange can be packaged according to your engineering or project specification and all this can be done with remarkably short deliveries.

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