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Sodium Hypochlorite Tanks

Technical Specifications for Sodium Hypochlorite Storage Tanks

Recommended Resin Materials for Sodium Hypochlorite (NaOCl) Storage:

Concentration % Temperature1 Recommended Resin Materials for Sodium Hypochlorite Storage2
0.5 – 5.25 ≤ 150° F. Derakane 411
0.5 – 5.25 > 150° F. to ≤ 180° F. Derakane 510A, B or C
> 5.25 – 18 ≤ 120° F Derakane 411
> 5.25 – 18 > 120° F. to ≤ 150° F. Derakane 510A, B or C
> 18 – 21 ≤ 110° F. Derakane 510A, B or C
> 21 – 25 ≤ 100° F. Derakane 510A Only

1. Elevated temperatures contribute to chemical decomposition.
2. Belding Tank’s bulk stored house resin is Derakane 411.

CAUTION! The life of a Sodium Hypochlorite Storage tank is greatly affected by the quality of the chemical itself. Tank owners are cautioned to use high quality sodium hypochlorite, to avoid decomposition of the chemical and degradation of the tank.

Veil Materials for Enhanced Tank Durability:

Two-ply C-Glass or Nexus® (Synthetic)

Catalysts Used in Sodium Hypochlorite Tank Construction:

BPO/DMA (Benzoyl Peroxide / Dimethylaniline) in the corrosion barrier

Co/MEKP (Cobalt Octoate / Methyl Ethyl Ketone Peroxide) in the structural layers

Curing Process for Sodium Hypochlorite Storage Tanks:

Hot air post cure after assembly for four hours @ 180˚ F.

Exterior Features of Sodium Hypochlorite Tanks:

If the Sodium hypochlorite tank is to be located outdoors:

  • Each tank has U.V. inhibitor in the exterior resin layer.
  • White gel coat should be considered as an option.

Optimal Fittings for Sodium Hypochlorite Storage Tanks:

Belding Tank uses only Integral (neck and flange face molded together) flanged nozzles.

Bolting Material: T-316 S.S. Standard (Titanium Optional)

Gasket Material: EPDM Standard (Viton™ Optional)

Venting Requirements for Sodium Hypochlorite Tanks:

Unless otherwise noted, all tanks are designed for atmospheric pressure only. Belding Tank recommends the vent be equal to or larger than the largest inlet or outlet fitting.

Plumbing Considerations for Sodium Hypochlorite Storage Systems:

Use of flexible connections resistant to sodium hypochlorite –

  • Allows for lateral and vertical expansion and contraction of the sodium hypochlorite storage tank
  • Reduces pump and piping vibration stress on the sodium hypochlorite tank

NOTE: Flexible Connections should be connected to the tank flange. Piping, valves and pumps must have structural support independent of the tank.

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