Dry Vacuum Pump

Why SIHI Dry?                                                       

Cost of Ownership                                                       

Manufacturers which have used SIHI Dry                                                       

Cooling Outlet                                                       

For reliable pump operation it is necessary to have a stable termperature profile within the operating chamber, avoiding both ”hot spots” and quenched zones. The SIHIdry achieved this by cooling both the pump casing and the rotors.

Optimised Gas Temperature                                                      

A key requirement for the effective and safe evacuation of corrosive media is the prevention of condensation in the pump. This requires the gas temperatures to be maintained above their dewpoints.

Conversely, many gases polymerise or “crack” at elevated temperatures. This can lead to deposits in the pumping chamber and seriously compromise pump performance.

For reliable pump operation it is necessary to have a stable termperature profile within the operating chamber, avoiding both ”hot spots” and quenched zones.

The SIHI^dry achieved this by cooling both the pump casing and the rotors.

Optional Drive Capabilities                                                       

The innovative drive concept of SIHI^dry and it‘s modularity enables it to be supplied as a basic unit for stand-alone operation or as an ”intelligent” unit in order to integrate with the customer‘s system.

Depending upon the level of automation required, a range of modules are available:

BASIC

This option contains “intelligent” features such as rotor diagnosis, electronic overload protection and fault codes (should problems occur). Rapid fault analysis is avaiable via a simple serial interface.

Applications                                                       

 Click here to view accessories

Dry running vacuum pumps for the chemical, pharmaceutical & other process industries

Dry running vacuum pumps are used increasingly for a range of applications within the chemical, pharmaceutical and other industries. These vacuum pumps are an integral part of the process and must satisfy a range of demanding requirements. These include:

• generating low operating pressure
• minimising the disposal costs of any service liquid
• providing “uncontaminated” vacuum, that is free from lubricant and service liquid
• offering the flexibility required for batch process operations
• low life-cycle costs.

SIHI^dry meets the need for a simple, robust and reliable vacuum pump that can handle liquid and solids carry-over as well as rapidly changing operating conditions

Performance Range                                                       

Clean in Process module                                                       

VARIATION IN DRIVE CONTROL

BASIC

Includes:
 - Fixed speed
 - AC supply
 - Input: start/stop
 - Input: reset of failure
 - Output: operation/failure
 - Serial interface

DYNAMIC

For the adaptation of the suction capacity to the actual requirement.

Includes:
 - Variable speed
 - AC supply
 - Input: start/stop
 - Input: reset of failure
 - Analogue input: set value
 - Output: operation/failure
 - Serial interface

CONTROL

Fully integrated into the system, this control provides some essential process and operating features.

These include: Warm up cycles; vacuum switching on/off; flushing for clean in place; N2 purging; and other external trips that can be hard wired into the system such as level and/or temperature gauges, etc. Importantly, the control does not require any further programming nor logic by the customer. Moreover a vacuum regulation in a range from 0-100% can be realised.

Following signals are available:
 - Digital status signals (vacuum operation, warning, stand-by, emergency stop, if necessary cleaning)
 - Analogue signals (torque, speed, and, if necessary the suction pressure and different temperatures)
 - Digital set points (start, stop, vacuum operation, and, if necessary cleaning)
 - Analogue set points (pressure, speed)

• For Tough Operation Conditions
- optimised rotor clearance
- torque monitoring

Pump Casing                                                       

For reliable pump operation it is necessary to have a stable termperature profile within the operating chamber, avoiding both ”hot spots” and quenched zones. The SIHIdry achieved this by cooling both the pump casing and the rotors.

• For Wet Processes

- vertical, self draining
- no stagnant areas of pump casing

• For Thermal Sensitive Substances

- optimum temperature / compression profile
- uniform temperature profile

• For Explosive Gases

- Ex-rating

- explosion proof design

• For Thermal Sensitive Substances

- optimum temperature /

  compression profile
- uniform temperature profile

Cooling Inlet                                                       

For reliable pump operation it is necessary to have a stable termperature profile within the operating chamber, avoiding both ”hot spots” and quenched zones. The SIHIdry achieved this by cooling both the pump casing and the rotors.

Optional Accessories                                                       

Module Purge Gas Ex

The standard EExP gas system regulates, controls, and monitors the inert N2 pressure at the shaft seal. It permits the unit to be installed within a hazardous area according to the ATEX – directive. The system is completely integrated and parameterised.

• For Explosive Gases

- Ex-rating

- explosion proof design

Secondary Cooling Water Circuit

Complete with circulating pump, flow indicator, pressure accumulator, adjustment valves, thermostatic control valve, and heat exchanger; this extensive option is fully integrated into the base-plate. This is particularly useful in areas where site cooling water feed and return lines have very low differential pressures, and is normally very poor quality. Closed loop cooling allows the flow to be accurately regulated from full flow conditions for effective cooling, down to zero flow for effective heating.

For reliable pump operation it is necessary to have a stable termperature profile within the operating chamber, avoiding both ”hot spots” and quenched zones. The SIHIdry achieved this by cooling both the pump casing and the rotors.

• For Explosive Gases

- low internal gas temperature

• For Thermal Sensitive Substances

- optimum temperature / compression 

  profile
- uniform temperature profile

Suction Valve Module

This module allows the pump to be isolated from the process at desired times. An example may be whilst the pump reaches pre-determined temperature, or rises above maximum temperature thresholds for selected organic (T4) media. This is carried out via a pneumatically operated suction line valve that is fully integrated within the CONTROL drive variant. Also, in standby situations, the valve avoids reverse flow through the unit whilst connected into common vacuum lines.

Outlet Valve Module

This module enables the safe shutoff of the SIHIdry at the suction side from the recipient by means of a pneumatically driven valve. The penetration of residual media into the pump as well as the return flow of exhaust gas through the pump into the recipient are avoided. The control of the valve is taken over by the electronics of the SIHIdry when the CONTROL drive variant is used.

Clean in Process Module

Perfectly suited to processes that employ polymerising, subliming, or basically sticky substances, this module allows automatic flushing from a solvent drum. Moreover, with an Angular Difference reading available from the pump, the operator can monitor the extent of any build up in order to optimise cleaning.
The flushing valve can also be used for N2 purging in order to provide an inert atmosphere within the machine after it has been stopped, and allowed to cool. This module is fully integrated into the SIHIdry when CONTROL drive variant is used.

• For Wet Processes

- liquid carry-over/flushing capability

• For Tough Operation Conditions

- liquid flushing during operation
- cleaning without dismantling pump

• For Wet Processes

- vertical, self draining

Temperature Measurement Module

By integrating temperature transmitters into the system, this module provides additional vacuum pump safety and recording.

• For Explosive Gases

- low internal gas temperature

Pressure Measurement Module

This module allows the measurement of different process pressures within the vacuum system. This module is fully integrated into the SIHIdry when drive variant CONTROL is used.

Operator Indicator Panel Module

Available when the drive variant CONTROL is requested, the panel provides the operator with a simple visual indication of the pump parameters. Characteristics like speed, pressure, torque, temperature, and the important angular difference, are available from a simple push button menu, and can be seen within the LCD.

PARA^dry Parameter Modification Module

Eliminating the need to employ PLC programmers, the PARA^dry software enables the principle process engineer to modify specific pump parameters. Such parameters are at the discretion of the customer and may include max / rnin temperature boundaries, speed and pressure, settings, warm up cycles, etc. providing long term future running adaptability, a standard windows based computer is needed.

ATEX Certified                                                       

The ATEX guidelines on risk assessment were a key element in the development of SIHIdry.

In contrast to typical dry running pumps, SIHIdry was designed in order to eleminate any potetial ignition sources in both normal operation and upset conditions.

Certified as a Category 2 machine, the standard SIHIdry can be used without flame arresters.

Where potential sources of ignition must be eleminated for occasional upset conditions, Category 1 units are available with EC type-test certification.

Videos                                                       

SIHI Dry Pump