Chemical and water storage tanks standard published

By Association of Rotational Moulders of Southern Africa (ARMSA)

A fit-for-purpose guarantee on water and chemical storage tanks.


The Association of Rotational Moulders of Southern Africa (ARMSA) announced the publication of a South African National Standard — SANS 1731:2017 — for polyethylene chemical and water storage tanks, developed in conjunction with the South African Bureau of Standard (SABS).

The tank standard is proof that the polyethylene tank has been properly designed and manufactured to be fit for purpose for the duration of its warranty life. “It compels tank manufacturers to conform to world best practise,” explains Wayne Wiid, ARMSA chairperson, “and it protects members of the broader construction, architecture, plumbing, landscaping, and built industries, as well as consumers, against tanks of lesser quality.”

The standard was specifically developed to withstand the harsh weather conditions experienced in the southern African market.

Productivity Engineering and Services Consultants (PESC), an independent third-party auditing company appointed by ARMSA, will regularly audit tank manufacturers who choose to comply. If compliant, PESC will issue a certificate giving independent assurance of a manufacturer’s claim that their products meet the SANS 1731:2017 criteria. Compliant tank manufacturers will be able to market their compliance with an ARMSA/SANS approved sticker on their tanks, as well as using the certificate and sticker in their general marketing programmes.

A word of warning from Wiid, “Any tank manufacturer can claim to meet the SANS 1731:2017 standard, but without formal certification there is no guarantee. We therefore urge all stakeholders and purchasers to request the PESC certificate from the manufacturer prior to purchase, for peace of mind that tanks delivered to sites have been thoroughly tested and certified.”

Any queries relating to the adoption of the standard or information on compliant manufacturers can be sent to This email address is being protected from spambots. You need JavaScript enabled to view it., or to the appointed tank standard auditor.

Why it is important for specifiers/consultants/authorities to use the standard

Reputable tank manufacturers who focus on what drives value in the industry will want to comply and will go through the independent auditing process as prescribed by ARMSA to qualify for the SANS 1731:2017 standard. And similarly, if specifiers, consultants, and the like wish to provide a high-quality service to their clients and protect their own reputation for delivering a quality product, they should use compliant tank manufacturers only. Only a SANS 1731:2017 certification guarantees tanks built to the highest international specifications.

Key points or aspects of the standard

SANS 1731:2017 was specifically developed to withstand the harsh weather conditions experienced in the southern African market and is the culmination of work and references to other tank standards in the world, with specific reference to Australia and India.

The rationale for the tank standard is to ensure that the quality of tanks produced by ARMSA members who are compliant, conforms to world best practise and that consumers and members of the broader construction, plumbing, landscaping, and built industry are better informed when choosing to purchase a rotomolded polyethylene tank. For example, the strength and durability of a polyethylene tank are directly proportional to the amount and quality of polymer used for a specific size tank.

The standard gives specific criteria in terms of the source of raw material, ultraviolet protection, overall weight, wall thickness, light penetration, stress crack resistance, and impact strength for a range of different sizes.

Other elements of the compliance audit for certification include checking for actual storage volumes versus stated volumes, the overall appearance of the finished tanks, the requisite number and type of fittings, and the date of manufacture. In addition, it seeks to ensure that the production methods used to manufacture the tanks comply with best practise and that traceability is built into the manufacturers’ control systems.

Click below to read the February 2018 issue of Plumbing Africa

PA Feb2018

PA PlumbdrainLogo100 PlumbingOnline150 TP SA Plumbers Handbook 150

Product of

IMD logo White

Interact Media Defined (IMD), is one of South Africa’s leading multi-media magazine publishers READ MORE

Talk to us

JHB T : +27 (0) 11 579 4940
CPT T : 0861 727 663
E :

13A Riley Road, Bedfordview,
South Africa 2007


Cookie policy
Privacy & Cookie policy
Privacy policy

© Interact Media Defined