Hydrochloric Acid Image

Hydrochloric Acid

Controlling a chemical – and its fumes

Also known as muriatic acid, hydrochloric acid is used to acidize petroleum wells, remove scales from boilers, aid in ore reduction and serve as a chemical intermediate, among other applications.

This pungent liquid is a strong, highly corrosive acid, and it presents serious storage challenges:

  • Hydrochloric acid has an extremely low pH, making it highly corrosive.

  • The chemical creates toxic fumes that can deteriorate equipment – and these fumes can be fatal to employees. To control the chemical’s fumes, the tank’s venting system must be exact.

  • Tank maintenance can also be an issue because of fuming. Entering the tank must be avoided at all costs, and part replacement must be minimized.

By creating a strong, corrosion-resistant tank system that ties into a scrubber system, all of these issues can be addressed.

The Poly Processing Hydrochloric Acid System

Storing a chemical as corrosive and fuming as HCl takes a truly specialized system. Poly Processing resolves these issues with its tank, venting and fittings solutions.

An Integrally Molded Flanged Outlet, or IMFO®, allows for complete drainage of the tank, which eliminates the need to enter the tank for cleaning. This is imperative when dealing with such a strongly fuming chemical.

The IMFO® design also reduces chances of having to replace parts, as the drainage system is part of the tank’s mold.

Poly Processing’s OR-1000™ surface is ideal for HCl storage. OR-1000™ has proven so effective in containing HCl that systems using it have a 5-year warranty. These tanks bring you the strength of high-density crosslinked polyethylene with an antioxidant surface.

Poly also incorporates airtight lids and customized scrubbers to accommodate the fuming of HCl.

For additional information on storing hydrochloric acid, including recommended storage tanks and components, download our Hydrochloric Acid Guide below.  Or, download the Tank Designs & Specifications Guide to see all of our chemical storage products.


Chemical Resin Type Specific Gravity Rating Fitting Material Gasket Material Bolt Material
Hydrochloric Acid ≤ 37% XLPE 1.9 PVC EPDM C-276


Tank Specifications

IMFO® construction eliminates the need to enter the tank for cleaning, helping employees avoid HCl's toxic fumes. 

High-density crosslinked polyethylene (XLPE) ensures the strength of the tank. 

Recommended System Components

SAFE-Tank® Double Wall Tank System

SAFE-Tank® Double Wall Tank System

Secondary containment: SAFE-Tank® is recommended where secondary containment is not available.

IMFO® Fittings

IMFO® Fittings

Fittings: IMFO® system is recommended. 

The B.O.S.S. Fitting®

The B.O.S.S. Fitting®

Fittings: B.O.S.S. fitting® is also recommended to prevent leaks.

FLEXIJOINT® Expansion Joint

FLEXIJOINT® Expansion Joint

Plumbing: requires flexible connections with fittings on lower third of sidewall to accomodate contraction and expansion, and reduce vibration stress on the tank. 

Fume-Tight Manway Cover

Fume-Tight Manway Cover

Fume-tight manway cover: 17", 19" or 24" with EPDM gaskets

PolyScrub™ and PolyScrub Plus™

PolyScrub™ and PolyScrub Plus™

Individually designed to support the reduction of dangerous fumes into the environment.

Technical Overview


IMFO® Vertical Flat Bottom of XLPE:

  • 1,000–13,650 gallons

  • 1.9 spg rating

Non-IMFO® alternative:

Standard Vertical Flat Bottom XLPE:

  • 1,000–13,650 gallons

  • 1.9 spg rating


  • 1,500–8,700 gallons

  • 1.9 spg rating for primary tank

  • Spg ratings for secondary tanks ≥ 3,000 gallons may be equal to or 1 less spg than primary tank.

  • All other tank sizes must equal primary tank spg rating.

Secondary containment

Recommend SAFE-Tank® secondary XLPE as shown above

Non-SAFE-Tank® Alternatives:

  • PPC secondary containment basin

  • Other secondary containment suitable for hydrochloric acid, of adequate size for use


Sidewall: Recommend 3˝ maximum B.O.S.S. fitting® 

Dome: No restrictions

Plumbing to the tank

  • Required use of flexible connections with fittings on lower third of sidewall

    • Allows for lateral and vertical expansion and contraction of the tank

    • Reduces pump and piping vibration stress on the tank

  • 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°


See Venting Chart

Foundation and restraints

  • PPC IMFO® tank pad or smooth concrete, asphalt or steel foundation designed to accommodate IMFO®, SAFE-Tank® or vertical tank

  • No restraint or ladder attachment bands circumscribing the tank are allowed. Cable restraint systems must pass cables over the top of the tank.


Product should not exceed 100°F at delivery or during storage to maintain ASTM D1998 design parameters.


Fume-tight manway cover to manage release of chemical gases


Restraint systems for wind and seismic, level gauges, ladders, heating pads, insulation and engineering stamp