| The volume calculator assumes the head profile
to be a perfect ellipse, which is correct for a semi-ellipsoidal head but
only approximate for a torispherical profile. Torispherical heads can have
different profiles depending on the relationship between:- Knuckle radius,
Spherical Radius and Diameter.
Two typical torispherical profiles are shown
below in Red, and the true ellipse
for the same diameter and head height is shown in Blue.
Treating a torisphere as an ellipse for volume calculation will generally
give a slight under estimate of the volume. The error will depend on the
relationship between:- Knuckle radius, Spherical radius and Diameter used. |
