Single Neck Spherical Vessels

Single Neck Spherical Vessels

Single Neck Spherical Vessels are precision-fabricated borosilicate glass vessels designed for single-point access processes requiring uniform stress distribution, high chemical resistance, and safe vacuum operation. The spherical geometry inherently minimizes mechanical stress concentrations, making these vessels ideal for thermal cycling, vacuum distillation, and chemical holding applications.

With a single centrally located neck, the vessel design reduces the number of joints and seals, thereby enhancing process safety, leak prevention, and ease of operation. These vessels are widely used in laboratory setups, pilot plants, and industrial glass process systems where simplicity and reliability are critical.

Construction & Manufacturing Technique

• Manufacturing method: Manual flame-working by skilled glass technologists
• Body geometry: True spherical profile for equalized internal pressure distribution
• Neck formation: Flame-formed single neck with precision alignment
• Joint type: Plain end / ground joint / flanged neck (as specified)
• Annealing: Computer-controlled annealing cycle to eliminate residual thermal stress
• Finish quality: Smooth internal surface to prevent product adhesion and contamination

Material of Construction

• Glass type: Borosilicate Glass 3.3
• Key material properties:
• Excellent chemical resistance to acids, alkalis, solvents
• High thermal shock resistance
• Low coefficient of thermal expansion (~3.3 × 10?? /K)
• Non-porous and non-absorptive, preventing metal or solvent loss
• High transparency for complete visual process monitoring

Technical Specifications

Standard Capacity Range

• 500 ml
• 1 L to 5 L (laboratory scale)
• 10 L to 50 L (pilot scale)
• 100 L to 500 L (industrial scale)

(Custom capacities available on request)

Operating Parameters

Parameter	Specification
Operating pressure	Atmospheric to full vacuum
Vacuum rating	Up to –1 bar (size & wall thickness dependent)
Operating temperature	Suitable for sub-ambient to high-temperature processes
Thermal cycling	Designed for repeated heating and cooling cycles
Heating methods	Heating mantle, oil bath, water bath
Cooling methods	Natural cooling or external cooling systems

Neck & Connection Details

• Neck position: Top-center aligned
• Neck sizes: As per DIN / ISO standards
• Connection options:
• Ground glass joint
• Flanged joint with gasket
• Plain pipe connection
• Seal compatibility: PTFE gasket, Viton gasket, or elastomer seals

Mechanical & Design Considerations

• Wall thickness: Optimized based on volume and vacuum rating
• Stress distribution: Uniform due to spherical geometry
• Dead volume: Minimal, ensuring maximum product recovery
• Support requirement: External cradle or ring support recommended for large volumes
• Mounting: Compatible with floor stands, frames, or skid systems

Typical Applications

• Vacuum distillation receivers
• Solvent recovery collection
• Reaction holding vessels
• Intermediate product storage
• Evaporation and reflux systems
• Feed or buffer vessels in continuous processes

System Integration

Single Neck Spherical Vessels integrate seamlessly with:

• Glass condensers (coil, shell & tube, Liebig type)
• Vacuum pumps and exhaust lines
• Heating mantles with controllers
• Support frames and clamps
• Glass pipelines and adapters

Optional Customizations

• Jacketed spherical vessel (glass or metal jacket)
• Custom wall thickness for higher safety margin
• Special neck orientation or size
• Bottom drain nozzle (on request)
• Custom supports and stands

Quality & Safety Assurance

Each vessel undergoes:

• Dimensional inspection
• Visual defect examination
• Annealing stress verification
• Leak path and joint integrity check
• Protective packing for safe transportation

Why Bhanu Scientific Glass Co.

• In-house borosilicate glass manufacturing
• Proven expertise in industrial glass process equipment
• Custom-built vessels as per process requirements
• Long service life with repairable modular designs
• Trusted by laboratories and industries across India