Defying a chemical that “finds” leaks
Also known as caustic soda or liquid lye, sodium hydroxide is used to adjust pH in water and wastewater treatment and in the manufacture of chemicals, rayon, cellophane, pulp and paper, aluminum, detergents, soaps and a wide range of other products.
As for storage:
- Sodium hydroxide is a “slippery” chemical that tries to find leak paths.
- This chemical is extremely corrosive to tissue. It is also highly toxic if ingested.
- If sodium hydroxide is not kept at a specific temperature, it will crystallize and go solid.
A tank system and proper fittings from Poly Processing can reduce your risk with this hazardous chemical.
The Poly Processing Sodium Hydroxide System
The key to storing sodium hydroxide properly is strong, safe containment. Since the chemical is so corrosive, secondary containment is a must.
If secondary containment is already available, the IMFO® tank is recommended. IMFO® systems are ideal for Sodium Hydroxide Systems because their flange is actually a molded part of the tank, and not an insert that could leak or fail.
The IMFO® also ensures long-term performance of the overall system, since it eliminates the need to drill into the sidewall of the tank and install a mechanical fitting, which can create a maintenance issue for this chemical.
When secondary containment is not available, a SAFE-Tank® can meet this requirement. This “tank within a tank” extends the margin of safety by providing a system with 110% secondary containment.
The tank’s high-density crosslinked polyethylene construction means greater strength. It is so strong, in fact, that Poly offers a warranty of five full years on all tanks.
For additional information on storing sodium hydroxide, including recommended storage tanks and components, download our Sodium Hydroxide Guide below.
|Chemical||Resin Type||Specific Gravity Rating||Fitting Material||Gasket Material||Bolt Material|
|Sodium Hydroxide 50%||XLPE||1.65||PVC||EPDM||316SS|
Tank options include:
High-density crosslinked polyethylene (XLPE) construction for maximum strength
OR-1000™ antioxidant inner surface
Integrally Molded Flanged Outlet (IMFO®) for complete drainage
SAFE-Tank® design for “tank-within-a-tank” protection
Recommended System Components
IMFO® FittingsFittings: IMFO® eliminates the need for confined space entry.
PTFE Expansion JointPlumbing: requires flexible connections to allow for lateral and vertical tank contraction and expansion, and to reduce vibration stress.
SAFE-Surge® Manway CoverVenting: SAFE-Surge® manway cover is recommended on pneumatically loaded systems to support tank longevity.
NOTE: Heating pad and insulation are highly recommended to prevent crystallization of the chemical.
IMFO® Vertical Flat Bottom of XLPE:
- 230–13,650 gallons
- 1.65 spg rating
Non-IMFO® alternatives :
- 55–8,700 gallons
- 1.65 spg rating for primary tank
- Spg ratings for secondary tanks must be equal to primary tank.
- All other tank sizes must equal primary tank spg rating.
Standard Vertical Flat Bottom XLPE:
- 30–13,650 gallons
- 1.65 spg rating
Alternative secondary containment: PPC secondary containment basin or other secondary containment suitable for sodium hydroxide, of adequate size for use
Plumbing: Requires use of flexible connections with fittings on lower third of sidewall. See Fittings & Accessories for flexible connections options.
- Expansion joints must meet the following minimum requirements:
- Axial Compression ≥ .67˝
- Axial Extension ≥ 0.67˝
- Lateral Deflection ≥ 0.51
- Angular Deflection ≥ 14°
- Torsional Rotation ≥ 4°
Venting: See Venting Chart
Foundation: PPC IMFO® tank pad or smooth concrete, asphalt or steel foundation designed to accommodate IMFO®, SAFE-Tank® or vertical tank
Temperature: Product should not exceed 100°F at delivery or during storage or drop below 50°F to prevent damage to the chemical. Contact Customer Support if chemical is to exceed 100°F.
Lid: SAFE-Surge® manway cover for pneumatically loaded tanks; bolted manway cover for all other applications
Options: Restraint systems for wind and seismic, level gauges, ladders, heating pads, insulation, mixer mounts, OR-1000™ for NSF-61 certification and engineering stamp