Three volumes to keep separate
Geometric vessel volume describes the internal enclosure. Maximum permitted fill volume reflects the necessary gas space and operating restrictions. Usable transfer volume is the liquid removed between the actual start and stop conditions. Instrument position, foaming, a heel of product and vessel geometry can make these values materially different.
Why some product remains
A discharge endpoint may intentionally leave liquid to reduce gas entering the product line or to meet another process requirement. The outlet location and pipe routing also influence residual inventory. Hygienic drainage is a separate question from whether the system delivers enough volume during production. Ask for both the operational heel and the cleaning/drainage arrangement in the design review.
Use a transparent capacity example
Suppose an illustrative vessel has a 2.0 m³ geometric volume and an agreed usable transfer volume of 1.3 m³. Capacity calculations must use 1.3 m³. If the full cycle takes six minutes, that vessel contributes an average 13 m³/h before any shared-system restrictions are applied. These figures demonstrate the method and are not standard SINOSEN dimensions or guaranteed performance.
Agree how volume will be verified
Level calibration should account for vessel geometry rather than assuming every increment of height represents the same volume. A commissioning test can compare measured delivered mass with density-corrected volume over multiple cycles. Record temperature, endpoints and instrument settings alongside the result. This provides a repeatable basis for future troubleshooting when throughput changes.
General engineering guidance. Numerical examples are illustrative; project specifications and acceptance criteria are agreed for the actual duty.