ViscoTwin Pumps Options

The ViscoTwin screw pump provides a range of options that allow adaption to many different situations. Please contact us if your needs are different and the options you are looking for do not appear below.

	Process Connections
Product Description	Gal/Rev	Max Rev	Pump Face	Pump Housing	Particle	Size
ViscoTwin 70.22	0.019 Gal/Rev	4,000 rpm	3.0” OD	2.5” OD	11mm	0.43”
ViscoTwin 70.29	0.025 Gal/Rev	4,000 rpm	3.0” OD	2.5” OD	14.5mm	0.57”
ViscoTwin 70.43	0.037 Gal/Rev	4,000 rpm	3.0” OD	2.5” OD	21.5mm	0.85”
ViscoTwin 104.27	0.043 Gal/Rev	3,600 rpm	4.0” OD	3.0” OD	13.5mm	0.53”
ViscoTwin 104.36	0.057 Gal/Rev	3,600 rpm	4.0” OD	3.0” OD	18.0mm	0.71”
ViscoTwin 104.53	0.084 Gal/Rev	3,600 rpm	4.0” OD	3.0” OD	26.5mm	1.04”
ViscoTwin 130.33	0.084 Gal/Rev	3,000 rpm	5.0” OD	5.0” OD	16.5mm	0.65”
ViscoTwin 130.44	0.112 Gal/Rev	3,000 rpm	5.0” OD	5.0” OD	22.0mm	0.87”
ViscoTwin 130.65	0.164 Gal/Rev	3,000 rpm	5.0” OD	5.0” OD	32.5mm	1.28”

Options for 3A or EHEDG

All ViscoTwin pump models are designed according to 3A and EHEDG guidelines. General design and detail design considerations like radii, O-ring grooves, surface treatment, material, and elastomer selection fulfill both norms.

Only pumps for the US dairy industry require the 3A symbol attached to it. The only difference is a slight improvement on the spindle polish. In case the spindles are hardened with the kolsterization process, the spindles show a matte surface, because the spindle polishing took place before the kolsterization process.

All ViscoTwin Pump Housings are hardened with a DURALOY treatment. The inside surface of the pump housing is always matte.

The general build of all ViscoTwin pumps also fulfills OSHA and CE guidelines.

Pump Face Options

NPSH Optimized Pump Face

Designed to transition pumped product more efficiently and gently between the Intake Pipe and the Pump Housing

Dual Port Pump Face

Allows for two lines to conjoin at the pump which reduces piping system complexity, while also maintaining efficiency.

Eco Pump Face

An Economic option pumping less viscous or more robust product that can withstand rapid pressure changes and turbulent flow.

Pump Face Port Size Options:

ViscoTwin70: 2” to 3”

ViscoTwin104: 2.5” to 4”

ViscoTwin 130: 3” to 6

Process Connection Options

An assortment of Process Connection options are available in a variety of sizes to fit your specific needs

Tri Clamp

(standard)

DIN 11851

(Outside Threaded)

DIN 11864-1

(Screwed Union)

DIN 11864-2

(Flange Union)

DIN 11864-3

(Clamp Union)

Varivent Flange

Butt Weld

Pump Housing Options

These lightweight cast ViscoTwin Pump Housings feature DURALOY hardening, and are designed to allow Pump Housing Ports up to 5” in diameter.

Pump Housing Port Size Options:

ViscoTwin70: 1.5 to 2.5”

ViscoTwin104: 2” to 3”

ViscoTwin 130: 2.5” to 5”

Process Connection Options

An assortment of Process Connection options are available in a variety of sizes to fit your specific needs

Tri Clamp

(standard)

DIN 11851

(Outside Threaded)

DIN 11864-1

(Screwed Union)

DIN 11864-2

(Flange Union)

DIN 11864-3

(Clamp Union)

Varivent Flange

Butt Weld

Elastomer Options

All Available ViscoTwin Elastomer Options are listed in the table below.

	MAX. TEMP	MAX. FAT	TEMP / STRESS
EPDM	140° C	10%	28 bar
FKM	120° C	100%	28 bar
V70SW	200° C	100%	40 bar
PERLAST	200° C	100%	50 bar

Spindle Options

Three different spindle pitches are available for each ViscoTwin pump size, in any combination of Standard, Hardened, or Hardened Tapered and your choice of EHEDG or 3A.

Smaller spindle pitches are used to create high discharge pressures, especially with product at viscosities below 2000 cps, at the cost of limiting the flowrate.

Larger spindle pitches can be used for high-viscous product at medium discharge pressure, and/or high flowrates of low-viscous media like CIP at lower differential pressures.

For product with specific particulate sizes, the spindle pitch will determine the minimum pump size. For example, if the particulate requires a cross section of 1”, then the pump would need to be a Model 104.53 or Model 130.65

Mechanical Seal Options

Different Mechanical Sealing Surfaces and Elastomers are available for the ViscoTwin pumps. Material and design are selected based on application. Processtec has mechanical seals for various pressure and temperature requirements available.

For easy handling, the ViscoTwin designed to use a fully pre-assembled cartridge seal to prevent assembly errors and damages to the sealing surfaces.

Single Acting Mechanical Seals (SAMS)

ViscoTwin NG Pumps with Single Acting Mechanical Seals CANNOT run dry. Due to the self draining capability of ViscoTwin NG Pumps, Processtec strongly recommends this type of seal in select applications where the pump never runs dry or without product, such as transfer pumps.

Sealing Surface:

- Silicon Carbide (SIC)

- Tungsten Carbide (TC)

- Tungsten Carbide Knife Edge (TCKE) (Standard)

Double Acting Mechanical Seals (DAMS)

ViscoTwin Pumps with Double Acting Mechanical Seals can run dry as long as the quench media flows through the seal. The quench media lubricates and cools the sealing surfaces whether there is product in the pump or not.

The quench media reduces friction between the rotating sealing surface and the static sealing surface. Processtec, as a default, installs water flush seals with Tungsten Carbide Knife Edge for exceptional longevity results – so far, we have not had one DAMS failure!

Sealing Surface:

Silicon Carbide (SIC)

Tungsten Carbide (TC)

Tungsten Carbide Knife Edge (TCKE) (Standard)

Bearing Housing Options

ViscoTwin pumps are unique in that they use 4 Angular Ball Bearings to absorb the axial forces in both directions. The Standard arrangement is 2:2. For High Pressure applications, we configure a 3:1 (shown below) or 1:3 arrangement, depending on flow direction. Only the ViscoTwin has 4 bearing slots, allowing for these kinds of arrangements, while other brands have 3 bearing slots only

High Pressure / High Temperature Options

The standard mechanical seals are designed to withstand a product area pressure of up to 400 psi. With High Pressure Seals, the product area pressure can reach up to 650 psi.

These seals are only available in a specially designed HPHT (High Pressure, High Temperature) ViscoTwin, which can be built to withstand temperatures of up to 380 degrees Fahrenheit!

Please contact Processtec for more information on our High-Pressure pumps.

CIP Options

The Available CIP Options for use with Processtec’s ViscoTwin pumps are outlined below.

Self-Propelled Cleaning (CIP)

The pump is used as a CIP return pump. This is mostly the case when a pump is installed as a tank discharge pump. The Max Flowrate is according to the pump curve for viscocity 1 cps.

Inline Cleaning (CIP)

Max Flowrate depending on differential pressure only. The pump does not need to propel the CIP solution and is part of the cleaned pipe line. A dedicated CIP pump upstream is propelling the CIP solution.

Motor Options

Four ViscoTwin pump motors are optimized to deliver max torque in the 300 to 1200 rpm range at the lowest performance requirement to save cost & complexity. Above 1200 rpm’s the ViscoTwin pump motor can be used to boost CIP & water, as low viscous media doesn’t require high torque. In order to use the motor at higher rpm’s, the VFD must be set to allow spin over 60 Hz. Most modern motors from reputable manufacturers can handle the 3600 rpm’s, as the shaft & bearings from 4-pole + motors are typically the same as their 2-pole counterparts.

Sample with 7.5kW (10hp) Motor
DESCRIPTION	SPEED @ 50Hz	TORQUE @ 50Hz	SPEED @ 60Hz	TORQUE @ 60Hz
2-Pole Motor	2900 rpm	25 Nm/18 lb-ft	3500 rpm	20 Nm/15 lb-ft
4-Pole Motor	1450 rpm	49 Nm/35 lb-ft	1750 rpm	41 Nm/30 lb-ft
6-Pole Motor	965 rpm	74 Nm/55 lb-ft	1166 rpm	61 Nm/45 lb-ft
8-Pole Motor	725 rpm	99 Nm/73 lb-ft	875 rpm	82 Nm/60 lb-ft

Gearmotors

Gearmotors are selected when higher torque is needed at lower power & CIP boosting isn’t required.

The general limit on gearboxes for overspeeding is 1.5x to 2x to nominal speed.

The generic rule of thumb is:

Metric: (Kw x 9549) = RPM x Torque in Nm

Imperial: (HP x 5252) = RPM x Torque in lb-ft.

The torque value of an electric motor is approximately flat between 30 Hz to 60 Hz. Above 60 Hz, the formulas above apply. Below 30 Hz, the loss in torque is very minimal.

Frame Options

Frame #1 Frameless (w/Four Legs)

Frame #2 Frameless (w/Six Legs)

Frame #3 Heavy Duty Frame

Frame #5 Slider Mount

Frame #4 Service Rail
Our most popular Frame Option!

Design Upgrades

Shaft Blocking Tool

SAVES TIME and increases SAFETY during maintenance, without the need of assistance.

Gapping Port

Allows for various monitoring sensors as well as EASY ACCESS for gapping procedures.

Vibration Sensor

Installs onto the Gear Housing to closely monitor vibrations (currently in development).

Oil Cooling System

In case very hot product is pumped, the heat can penetrate through the shaft to the needle bearings, and shaft seals. It is recommended to install an oil cooler with oil filter to maintain the oil quality and oil temperature at the needle bearings at max 212° F (100° C).

Seal Water Automation Kit

Allows you to accurately supply seal quench water to the ViscoTwin Mechanical Seals. Includes a Flow Meter with Set Point, a Solenoid or Pneumatic Shut-off Valve, and also Stainless Steel piping as well as compression fittings.