Manway Additions

The solids addition process for chemical reactors can be a complicated and very dangerous process. Due to the presence of solvents, there is often a potentially explosive environment within vessel. The addition of dry solids introduces risk of static discharge and entrained oxygen which completes the highly dangerous fire trial and risk of a major deflagration event at the manway. Rheo offers many options for safe solids addition into your chemical reactor.

The Rheo Nitrogen Purge Hopper is a manway charge hopper that provides dust and vapor control while using a nitrogen purging system to maintain low oxygen concentrations throughout the solids addition process.

The Rheo Drum Tipper can be used to lift and place the drum into an ergonomic position for easy powder transfer. Using the drum liner to help guide the powder into the charge hopper, this system offers excellent dust control. Please see video below that shows how the drum liner can be used to transfer the powder in a contained fashion.

key stat icon


key stat icon

Oxygen Concentration in Vessel

key stat icon

Point Source Capture

key stat icon

150 kg/minute
Product Transfer Time



Rheo Inerting equipment Manway Nitrogen Purge Hopper

Nitrogen Purge Hopper

The Manway Nitrogen Purge Hopper facilitates the addition of large quantities of powders or other solids through vessel manway openings. This design can be configured to facilitate the charging of bag stock, bulk sacks, or drums.

The Nitrogen Purge Hopper serves as an engineering control to help maintain low oxygen concentrations within a process vessel during the manual addition of solids. This device utilizes a safe, pneumatically opened flap valve that reduces the amount of time the tank is opened to the room environment. A full perimeter annular ring injects nitrogen at dual flow rates to dilute oxygen concentrations in the manway region of the tank. This engineered system has proven to maintain oxygen levels to below 5% for the duration of a charging process.


Drum Tipper

The Rheo Drum Tipper addresses the ergonomic risk factors associated with manually dumping drums. Each Drum Tipper is designed to meet the specific requirements of the application (drum weight, discharge height, discharge reach, etc.). The single stage (standard) design is intended to discharge at the height appropriate for the application.

Mobile Transport Cart (Supporting Product)

The Mobile Transport Cart allows for easy transportation and cleaning access for all hopper components.

Rheo - Containment Equipment - Air Filtration Unit

Air Filtration Unit (Supporting Product)

Rheo offers a complete line of portable and stationary Air Filtration Units that provide a local HEPA filtration device to serve Local Exhaust Ventilation (LEV) systems. The Rheo Air Filtration Unit is designed to meet the utility requirements of multiple Rheo Ventilation Sleeves; it is also a good fit for any application with similar extraction utility requirements.

Each system is configured to comply with international electrical standards. The GMP compliant design features a small footprint and noise rating of 76 dBa. Safe Change filters and activated carbon filters for VOC’s are also available.

Rheo Air Filtration Units are a cost effective alternative to upgrading house exhaust systems that have become over utilized or where there is a need to prevent the contamination of the house exhaust system ducting.

Tank Dynamics

In order to reduce the risk of deflagration within a process tank, an inert gas must be injected in the correct quantity, location, and time of the product transfer. Understanding the tank dynamics of each application is critical to implementing the best engineering control for this process. Existing nitrogen blanketing systems frequently do not apply the gas at the correct quantities, location, or timing during the solids addition process. This results in elevated oxygen concentrations in the manway region of the tank which increases the likelihood of a deflagration near the chemical operator.

Our inerting systems provide an effective control to reduce and maintain oxygen concentrations during the solids charging process. The dual rate injection system is adjustable and can be integrated with an oxygen level sensor to provide a precise control system.

The two figures to the left illustrate how a properly designed inerting system can change the tank dynamics and reduce the risk of  deflagration. The first figure demonstrates a common tank system that allows elevated oxygen levels near the manway region during the solids addition process. All three components of the fire triangle [oxygen, ignition source, and fuel] are established in this scenario. The entrained air delivers oxygen to the headspace of the tank and mixes with the dry dust and solvent vapors. Static charge can generate the energy to ignite this volatile mixture resulting in a dangerous deflagration event, injuring the chemical operator and causing significant equipment damage. The second figure to the left shows a tank where the inert gas is added at the proper quantity, location, and timing of a solids addition process. A properly located 02 sensor can provide accurate O2 concentrations to confirm a safe work environment.

Alternative Methods