Tank Mixing Eductor
Model TLM-521

Name: RTM Tank Mixing Eductor Model TLM-521
Brand: RTM Tank Eductors
Availability: InStock

Investment cast tank mixing eductors that provide powerful, uniform agitation using the Venturi principle — no mechanical mixers, no moving parts, no maintenance.

4–5×

Flow Amplification

Moving Parts

10–60 PSI

Operating Range

Tank Heating Eductors →

RTM TLM-521 tank mixing eductor — investment cast stainless steel

No Moving Parts

Zero mechanical components means minimal maintenance, no shaft seals, no impellers, and no lubrication requirements.

4–5× Flow Amplification

When operated at 10–60 PSI pressure drop, the TLM-521 entrains at least 4–5× as much tank liquid as the motive fluid used.

Compact In-Tank Mounting

Submerged mounting eliminates costly overhead support structures and does not interfere with other tank equipment.

Open or Closed Tanks

Suitable for a wide variety of open vessels and enclosed tanks across food, chemical, refining, and general process industries.

How Tank Mixing Eductors Work

A predetermined amount of liquid — called the operating fluid — is pumped through a header pipe to one or more TLM-521 eductors submerged inside the tank. As the operating fluid leaves the nozzle, it creates a high-velocity jet that dramatically reduces local pressure (the Venturi effect).

This low-pressure zone draws in surrounding tank liquid at 4–5× the motive flow rate — no pump, no impeller, just fluid physics. The motive fluid and entrained liquid mix thoroughly in the parallel section before discharging as a powerful plume that circulates the entire tank.

In most cases, the TLM-521 will produce a homogeneous mixture of the vessel contents in one to three turnovers. To calculate required turnover time, divide tank volume by the result of (number of eductors × outlet flow in GPM).

RTM Tank Eductors family — TLM521 series in multiple sizes and connection styles, 316SS construction

RTM TLM521 Series — Multiple Sizes & Connections

Motive Fluid Enters

A recirculating pump delivers operating fluid through a header pipe to one or more TLM-521 eductors submerged in the tank.

Venturi Jet Forms

Fluid accelerates through the converging nozzle, creating a high-velocity jet that dramatically reduces local pressure.

Tank Liquid Entrained

The low-pressure zone draws in surrounding tank liquid at 4–5× the motive flow rate — no pump, no impeller.

Mixing & Discharge

Motive fluid and entrained liquid mix in the parallel section, then discharge as a powerful plume that circulates the entire tank.

Applications

The TLM-521 handles a wide range of viscosities and liquid types — including slurries and suspensions — making it especially useful for maintaining uniform liquid characteristics throughout tank contents.

Blending and pH uniformity
Temperature equalization
Solids suspension and distribution
Stratification prevention
Gas dispersion
Non-miscible liquid mixing
Slurries and suspensions
Viscous liquid agitation

Materials & Connections

Available in materials to suit food, chemical, refining, and general process industries. Standard body connections: 3/8″ and 3/4″ — male NPT; 1-1/2″ through 3″ — female NPT; 4″ and above — flanged.

From Stock — Ships Fast

⅜″ – 3″ in Carbon Steel & 316 Stainless Steel

3″ 316SS also stocked with 150# ANSI flanged connections. No lead time on stocked configurations.

Carbon Steel316 Stainless SteelBronzePVCPPLPVDF

Custom Manifold Designs Available

We design manifolds customized to your unique application — eliminating dead zones and ensuring complete circulation in large or complex tanks.

Dimensional Data — Model TLM-521

Size	Length (in)	Length (mm)	Width (in)	Width (mm)	Connection	Nozzle (mm)
3/8"	—	—	—	—	3/8 MNPT	—
3/4"	7.25	184	3.69	94	3/4 MNPT	20
1-1/2"	10.88	276	5.50	140	1-1/2 FNPT	28
2"	14.50	368	7.69	195	2 FNPT	41
3"	22.00	559	11.75	298	3 FNPT	63
4"	25.00	635	12.00	305	4 FLGD	76
6"	35.00	889	25.00	635	6 FLGD	114
8"+	—	—	—	—	Contact factory for 8" and over	—