Issue 3.1 of WSA 137-2019 has been amended to include:

  • Larger diameter range of base and riser up to DN 1000, classified as Maintenance Holes. Maintenance holes complying with this Standard can be supplied with or without steps or fixed ladders. This Standard does not provide detailed requirements for ladders or steps to facilitate person entry but appropriate EN Standards are referenced.

Other revisions include:

  • loading testing on upper assembly components of maintenance shafts, maintenance chambers and maintenance holes
  • provision of slip resistant raised surface patterns on maintenance hole benching and testing requirements.
  • General updates to references and other editorial amendments.
Also known as
WSA 137-2019 Amd 1 2019
Publication date
Last updated date

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