Fittings & options

Sulfuric Acid Tank Fittings

Every fitting, gasket and bolt on a sulfuric acid tank has to resist the acid at your concentration. We specify and install them at our Willis, Texas plant so the tank arrives ready to connect.

Viton® gasketsPVDF above 75%No welded sidewall flanges

Browse Fittings Compatibility Chart

The rules

Choosing Fittings for Sulfuric Acid

≤75

Up to 75%

PVC, CPVC, polypropylene, HDPE and PVDF fittings are all rated Excellent. See the chart.

>75

75% to 93%

PVDF fittings are rated Excellent and HDPE Good. PVC is severely attacked; CPVC and polypropylene drop to Fair.

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Gaskets

Viton® is rated Excellent at every concentration. EPDM is Good above 10%; Buna-N falls to Fair above 75%.

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Hardware

Hastelloy is rated Good throughout. Avoid 316 stainless above 10% and titanium at any strength.

No welded flanges in the sidewall. We do not install welded flanges in the sidewalls of tanks storing sulfuric acid or other oxidizers. We use bulkheads and bolted flanges instead.

Connections

Bulkheads & Flanges

½″ – 4″

Bulkhead Fittings

The most common tank connection, sealed with a Viton® gasket. PVC, CPVC or polypropylene up to 75%; PVDF above 75%.

Bolted & Spool Flanges

A bolted flange through the tank wall, used in place of a welded flange in sulfuric acid service.

Top of tank

Self-Aligning Bulkheads

Seals on the curved dome for top-of-tank connections such as fill and vent lines.

Flow & venting

Valves, Vents & Fill Lines

Ball Valves

True-union and compact ball valves in materials matched to your concentration.

2″ · 3″ · 4″

Screened U-Vents

Atmospheric tanks must vent. Concentrated acid absorbs moisture from the air, so ask us about vent options for your site.

Top Fill Lines

Fill from ground level through a line that runs up the sidewall and enters the top of the tank.

Monitoring

Level & Leak Monitoring

Non-contact

Ultrasonic Level Sensors

Non-contact level measurement that never touches the acid, with an optional display and controller.

Reverse Float Level Indicators

A simple, non-electric gauge that shows the liquid level on the outside of the tank.

Double wall

Interstitial Leak Detectors

For double wall tanks: a probe between the walls sounds an alarm, flashes a strobe and can signal your PLC.

Protection

Insulation, Heat & Restraint

R-6.7 / inch

Spray-Foam Insulation

Closed-cell polyurethane foam rated R-6.7 per inch. 2″ standard; 3″ and 4″ available. See insulated sulfuric acid tanks.

Heat Tracing

Heat trace pads and a controller keep concentrated acid from freezing in cold weather. Why acid freezes.

120 mph

Wind & Seismic Tie-Downs

Galvanized cable tie-down systems for vertical tanks under 5,000 gallons, rated for 120 mph winds. See the installation guide.

Check Every Material Against Your Acid

Tank, fittings, gaskets and hardware all need to be rated for your concentration.

Compatibility Chart Sulfuric Acid Tanks