What is nominal volume compared to working volume?
When sizing and selecting industrial tanks, the terms nominal volume and working volume are often used to describe the capacity of the tank.
Nominal volume refers to the total geometric volume of the tank while working volume describes the volume actually used during normal operation depending on process and safety requirements.
Processöverskott offers both new and used stainless steel tanks in stainless steel 304 and acid-proof 316 where different volume data may occur depending on the design, specification and application.
What is nominal volume?
Nominal volume describes the total geometric capacity of the tank based on the tank dimensions and construction.
It is the maximum theoretical volume that the tank can contain if it is filled up to the defined upper level depending on the design.
Nominal volume is often used as a reference in the classification, marking and technical specification of tanks and pressure receptacles.
What is working volume?
Working volume describes the volume used under normal operating conditions of the process.
The working volume is usually lower than the nominal volume because account needs to be taken of, for example
Safety margins
Overfill protection
Internal components such as stirrers
Foaming or expansion
Temperature variations
Process-related operating conditions
The actual working volume varies depending on the design and use of the tank.
Why is the difference important?
The difference between nominal and working volume is important when planning and dimensioning industrial processes.
It is usually the working volume that influences, for example, batch size, buffer capacity and production operating conditions depending on the process and application.
In design and process planning, both volume values are often taken into account depending on the application.
Materials and the impact of construction
Tanks in stainless steel 304 or acid-proof 316 can be equipped with, for example, agitators, CIP systems, temperature-related solutions and other internal equipment depending on the specification.
Internal components and construction can affect the working volume as they occupy space inside the tank.
The design of the tank varies depending on the process requirements and the application.
Pressurized and atmospheric solutions
In pressurized tanks, additional safety space may be needed depending on the design and operating conditions.
This can affect the difference between nominal and working volume depending on, for example, pressure level, temperature and process requirements.
Atmospheric tanks may also have safety margins to reduce the risk of overfilling during operation.
Documentation linked to, for example, PED and CE may be available depending on the design and classification of the tank.
Applications in industry
The concepts of nominal and working volume are used in several types of industrial processes.
Examples of applications include food production, chemical industry, pharmaceutical related processes and water treatment where proper volume handling can be important for operation and process control.
Technical options and equipment
Tanks can be equipped with, for example:
Agitators and mixing equipment
Temperature-related solutions such as sheathing or insulation
Level measurement and overfill protection
CIP system for cleaning
Valves and process connections
Pressure monitoring and safety-related functions
The design varies depending on the model, specification and application.
Volume and capacity
Industrial and process tanks come in many different sizes depending on the process and capacity needs.
Volume can influence factors such as design, safety margins and peripheral equipment needs depending on the application and operating conditions.
Benefits of correct sizing
Correct understanding of nominal and working volume is often used in:
Batch size planning
Sizing of process equipment
Buffer capacity and flow management
Safe operation and overfill protection
Layout and production planning
New and used tanks
Processöverskott offers both new and used process tanks and industrial containers in various designs and sizes.
Tanks may be equipped with different technical solutions depending on the model and previous use. Availability varies depending on stock status and specification.
Choosing the right solution
Tank selection and sizing is often based on factors such as process requirements, fluid properties, temperature, pressure conditions and desired working volume.
Process surplus can provide information on different designs and technical options depending on the application and area of use.
Executive summary
Nominal volume describes the total geometric capacity of the tank while working volume describes the volume used under normal operating conditions.
The difference between these values is influenced by, for example, safety margins, internal components and process requirements depending on the design and application.
Frequently asked questions about nominal and working volume
What is nominal volume?
Nominal volume describes the total geometric capacity of the tank based on its dimensions and construction.
What is working volume?
Working volume describes the volume used under normal operating conditions of the process.
Why is the working volume lower?
Working volume is affected by factors such as safety margins, internal components and operating conditions.
Does agitator affect working volume?
Internal equipment such as agitators may affect the available volume inside the tank depending on the design.
Can two tanks have the same nominal volume but different working volume?
The working volume may vary between different tanks depending on the design, equipment and application.