STX Sliding Vane Pumps

Blackmer® STX Series pumps, which are part of the Stainless Line of sliding vane pumps, offer fast fluid off-loading for high-temperature, high-viscosity applications. For example, typical off-loading of a 6,000 gallon (22,700 liter) tanker can be unloaded as quickly as 24 minutes. These pumps are made from 316 stainless steel with external ball bearings, non-metallic Duravanes, PTFE elastomers, and Blackmer chemical mechanical seals. STX pumps feature an adjustable relief valve, versatile mounting bracket, weld flanges and are self-priming.

The STX Series is designed to offer easy maintenance because the internal wear is almost completely limited to the sliding vanes, which can be replaced with ordinary hand tools.

Features and Benefits

316 stainless-steel pump with external ball bearing construction, Blackmer chemical mechanical seals and non-metallic vanes for longer life with corrosive products
Available in 2- and 3-in sizes
Pump design and operation minimizes shear and agitation
Adjustable relief valve protects pump against excessive pressures
Advantages of sliding vane technology:
- Unique sliding-vane pump design self-adjusts for wear to maintain flow rates
- Excellent self-priming and dry-run capabilities
- Sliding vane design provides sustained performance and trouble-free operation
- Easy maintenance: vanes can be easily replaced without removing the pump from the piping system
- High suction lift and line-stripping capabilities
- Low maintenance and low life-cycle costs

Application

Loading & unloading corrosive & non-corrosive fluids:

Sulfonic acids
Specialty chemicals
Solvents
Latex paints
Liquid sugars
Vegetable oils

Performance and Specifications

AVAILABLE MODELS

STX2
STX1220
STX3

NOMINAL FLOW RATE RANGE

STX2A: 7 - 60 gpm (27 - 227 L/min)
STX1220A: 45 - 92 gpm (171 - 348 L/min)
STX3: 85 - 250 gpm (322 - 946 L/min)

DIFFERENTIAL PRESSURE

125 psi (8.6 bar)

MAXIMUM WORKING PRESSURE (MAWP)

175 psi (12.1 bar)

VISCOSITY

STX2A: 0.2 - 990 cP
STX1220A: 0.2 - 22 cP
STX3: 0.2 - 4,250 cP

TEMPERATURE

-25°F to 240°F (-32°C to 115°C)

MIN/MAX SPEED (RPM)

SSTX2A: 150 - 800
STX1220A: 700 - 1,200
STX3: 300 - 800

CONNECTION ORIENTATION

Side Inlet | Top Outlet

VANE MATERIALS

Duravane

AVAILABLE CERTIFICATES

Hydrostatic Test
Performance Test
NPSH Test
Material (actual or typical)
Dimensional (pump only or unit)

PRIMARY MATERIALS OF CONSTRUCTION

Stainless Steel

Model

Length

Weigth

Height

Approx W.

STX2A, STX1220A

STX3

in
mm

16-3/4
425.4

20-2/3
524.5

9-4/7
242.9

12-5/8
320.8

8-2/3
220.6

11-5/9
293.7

70 lb
32 kg

132 lb
60 kg

Part

Cylinder, Heads, Relief Valve Cover

Material

316 Stainless Steel: ASTM A743, CF-8M