Shand & Jurs 94321 Air Dryer

For terminal operators, chemical storage engineers, and product-integrity specialists, the Shand & Jurs 94321 Air Dryer removes moisture from ambient air entering storage tanks during pump-out and thermal breathing, protecting moisture-sensitive products when outside air must enter the vessel.

Unlike feeding atmospheric air directly into the tank through a screen or free vent, the 94321 passes the in-breathing stream through a high-capacity desiccant bed contained in a perforated stainless steel basket, removing water vapor inside the material pores before the air reaches the stored product.

Hard spherical desiccant media minimizes pressure drop while maintaining effective retention time, allowing normal tank breathing at nominal capacities up to 3,500 SCFH and delivering approximately −100°F dew point air at design flow. A visual humidity indicator signals when regeneration is required.

The desiccant can be thermally regenerated at 400°F and reused through thousands of cycles, supporting long service life on moisture-sensitive liquids, hygroscopic chemicals, ethanol storage, additive tanks, and atmospheric vessels where inert blanketing is not required.

Features

Absorbs moisture during normal tank in-breathing, delivering approximately −100°F dew point air at design flow rates to protect stored product.

Hard spherical beads maintain airflow while minimizing pressure drop so conservation vents are not forced to cycle unnecessarily during routine breathing.

Perforated stainless steel basket retains media during service and can be removed for cleaning, inspection, and scheduled desiccant regeneration.

Provides a visual cue when the desiccant bed is approaching saturation, supporting condition-based service rather than calendar-based replacement.

Media can be thermally regenerated at 400°F and reused through thousands of cycles, removing a routine consumable-replacement line item from operating cost.

Available in 2″, 2″ XL, or 3″ NPT or flanged connections, matching tank breathing capacity and existing piping standards across storage sites.

Applications

Moisture-Sensitive Liquids: Protects stored products whose quality degrades when exposed to water vapor, by drying incoming air during pump-out and thermal contraction cycles.
Hygroscopic Chemicals: Keeps hygroscopic materials dry during atmospheric breathing, preventing water uptake that alters concentration, specification, or downstream process performance.
Ethanol Storage: Suits fuel-grade and industrial ethanol tanks where absorbed water shifts blend specifications and reduces the value of the stored product.
Additive Tanks: Protects specialty additives and blending components that must stay within tight water-content limits to meet product specification on the finished blend.
Intermittent Pump-Out: Covers tanks with irregular draw cycles where large volumes of outside air enter quickly, by drying the full in-breathing stream through the bed.
Atmospheric Tanks: Fits storage where inert blanketing is not justified but product still needs protection from humidity, giving a mechanical alternative to nitrogen systems.

Specifications

Parameter

Specification

Device Type

Tank breathing air dryer with regenerable desiccant bed

Dew Point at Design Flow

Approximately −100°F

Nominal Flow (1" W.C. ΔP)

840–3,500 SCFH

Maximum Pump-Out Rate

150–600 GPM

Design Pump-Out Rate

75–300 GPM

Water Vapor Capacity

5–20 lbs

Desiccant Capacity

50–200 lbs

Regeneration Temperature

400°F

Desiccant

Calcium sulfate / calcium chloride blend

Body

Mild steel

Basket

Stainless steel perforated basket

Gasket

NBR

Hardware

Steel fasteners

Available Connection Sizes

2″, 2″ XL, or 3″

Connection Types

NPT or flanged

Service

Atmospheric storage tank in-breathing

Options

2″ connection (standard), 2″ XL (increased airflow), 3″ (high breathing flow), NPT or flanged connections, replacement desiccant for long-term maintenance program

2026 COST ESTIMATE

Contact Support

If you have questions not covered here, please contact the Cognesense support team for assistance.

When is an air dryer preferred over a nitrogen blanketing valve?

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An air dryer is appropriate where the tank is atmospheric and inert blanketing is not justified, but the stored product is still sensitive to moisture. Outside air has to enter during pump-out and thermal contraction anyway; the 94321 dries that incoming air rather than excluding it. For fully inert vapor-space protection, the Shand & Jurs 94270 Tank Blanketing Valve is the correct selection.

What dew point does the unit deliver?

The 94321 delivers approximately −100°F dew point air at design flow rates and nominal capacities up to 3,500 SCFH, depending on size. This is low enough to protect the majority of hygroscopic chemicals, fuel-grade ethanol, and specialty additives from incidental moisture uptake during routine breathing.

Can the desiccant be regenerated?

Yes. The calcium sulfate / calcium chloride blend can be thermally regenerated at 400°F and reused through thousands of cycles. Removing the stainless steel basket for regeneration supports long-term service without the recurring cost of disposing of and replacing consumable media on each cycle.

How do operators know when regeneration is needed?

A humidity saturation indicator provides a visual cue when the desiccant bed is approaching saturation. That supports condition-based servicing rather than calendar-based replacement, so regeneration is performed only when the bed actually needs it.

Does the dryer cause the conservation vent to cycle more often?

No. The spherical desiccant media is chosen specifically to minimize pressure drop through the bed, so the dryer adds only a small resistance to the in-breathing path. That keeps the tank inside its normal breathing profile and does not force the conservation vent into nuisance cycling during routine operation.

What connection sizes and types are available?

The 94321 is offered in 2″, 2″ XL (increased airflow), and 3″ (high breathing flow) sizes, with NPT or flanged connections. That range covers most storage-tank breathing capacities and lets the dryer match existing piping standards without adapters.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs 94321 Air Dryer is chosen when atmospheric tanks must breathe but their contents must stay dry. Its high-capacity desiccant bed, low-pressure-drop spherical media, and regenerable design deliver roughly −100°F dew point air on every pump-out and thermal-contraction cycle, without the utilities or piping of a blanketing system. For ethanol, additive, and moisture-sensitive chemical storage, it is trusted wherever you need to measure, monitor, and protect what matters most.

94321 Air Dryer