Copper hemisphere for the beverage industry according to ASME standard

At Antonius, projects range from massive industrial vessel heads to refined copper components for the beverage industry. A recent example illustrates this versatility: a copper hemisphere with an internal diameter of 2,716 mm and a wall thickness of 4 mm, manufactured from SB 152 C1220 H02 copper alloy. The component will ultimately be used in a pot still for whisky production, where technical precision and flawless appearance are equally important.

The properties of SB 152 C1220 H02 copper alloy

The material used in this project, SB 152 C1220 H02, is a deoxidized high‑phosphorus copper (Cu‑DHP). This alloy C1220 is known for its excellent formability, weldability, and corrosion resistance. The H02 temper indicates a half‑hard condition, giving the material both strength and ductility. These characteristics make it especially suitable for applications where complex forming and reliable welds are required.

The designation SB-152 refers to the ASME standard for copper sheet, strip, and plate. It defines the chemical composition, mechanical properties and manufacturing tolerances that ensure the material can be safely and consistently applied in pressure vessel and heat‑exchange environments. For copper hemispheres, this means that both the base material and the final component comply with internationally recognized quality benchmarks, offering distillers confidence in long‑term durability and performance.

In pot stills, copper plays a vital role beyond structural function. The metal interacts with the vapor during distillation, helping to remove unwanted sulfur compounds and refine the flavour of the spirit. For this reason, copper remains the material of choice for distillers worldwide.

Manufacturing a metal hemisphere according to the ASME standard

Transforming flat copper plates into a hemisphere of this size requires both engineering skill and careful handling. The Antonius team presses the plates into pre‑formed segments, which are then welded together to create the full hemispherical shell. Surface protection is essential throughout the process because copper in this alloy is relatively soft and scratches easily.

Ralph Hofman, Sales Engineer at Antonius, explains:

“These materials are soft and scratch easily, so maintaining a flawless surface is essential. For our clients, the visual quality is just as critical as the exact dimensions. Throughout the process we take measures to protect the material, ensuring each hemisphere leaves Antonius clean and free of scratches, ready for the distiller to continue the traditional hand‑hammering and shaping process. We press the copper into pre‑forms, then weld the segments. We deliver them in this stage, and the client continues with hammering and finishing — saving them significant time compared to starting entirely by hand.”

Quality, aesthetics and tolerances

While dimensional accuracy matters, the aesthetic quality is just as decisive. Pot stills are often prominently displayed in distilleries, where their polished copper surfaces are a visual hallmark. Any visible imperfection would detract from the final result. For Antonius, delivering hemispheres that meet both technical and visual standards is therefore essential.

At the same time, the tolerances for such hemispheres are pragmatic. Certain connection points must fit precisely to flanges or other mating parts, but slight variations in height or curvature remain acceptable. The balance between strict dimensional accuracy and practical requirements is part of Antonius’ expertise in pressure vessel head production.

A broader trend in metal hemisphere manufacturing

Traditionally, pot still hemispheres were shaped entirely by hand, an extremely labor‑intensive process. By supplying pre‑formed hemispheres, Antonius enables manufacturers to reduce lead times and cost. Ralph Hofman explains:

“Traditionally, pot still hemispheres were hammered into shape completely by hand, which is extremely time‑consuming. By taking care of the rough pre‑forming and welding, we allow manufacturers to focus on the real artisanal work. They can dedicate their expertise to finishing and hammering, while we deliver a hemisphere that already has the correct basic form. This way their production process is faster, more efficient, and the company preserves the craftsmanship that defines the final product.”

Copper or stainless steel metal hemisphere supplier Antonius

This project highlights Antonius’ ability to combine advanced forming techniques with respect for the traditions of the beverage industry. By applying their expertise in pressure vessel heads to copper hemispheres, they contribute to the efficiency, quality and aesthetics of pot still manufacturing. The result is a component that reflects both engineering precision and the timeless appeal of copper craftsmanship.

Do you require a similar vessel head or are you curious how Antonius would help you increase efficiency? Please contact our sales team at sales@antonius.nl or call +31(0)475 439 000.