Overall dimensions of the complete unit including locating of all
fittings and connections, the space required for removal and
replacement of parts for maintenance, and mounting information.
The certification by the mechanical seal manufacturer required by
The following dimensions, which are related to interchangeability
of pumps and drivers as a unit. The drawing shall include a
tolerance for each of these dimensions. Each dimension shall
also be shown with the same value and tolerance on the detail
drawing for the part:
For support feet or other support connections between the
ship and the pump and driver unit: The X, Y, and Z dimen-
sions, or three dimensions in another suitable coordinate
system, locating the feet and any bolt holes in the feet.
For all piping connections: The X, Y, and Z dimensions, or
three dimensions in another suitable coordinate system,
locating the point of intersection between the axis of the
connection and the face of connection, such as a flange face.
The dimensions shall be referenced to the same surfaces to
which the support feet are referenced, either directly or
via other tolerance dimensions.
For all flanged piping connections:
The diameter of the bolt circle and the concentricity of
that circle relative to the axis of the connection.
The angular location of each bolt hole with respect to
some reference line shown on the drawing. Even if the
angle to the reference line is O to 90 degrees, that
number shall be stated, with a tolerance. It is
acceptable to locate only one bolt hole relative to the
reference line and to state the remaining holes are
equally spaced as long as a tolerance is specified on
the equalness of the spacing.
In lieu of a. and b. above, an X-Y coordinate system may
be used to locate the bolt holes.
The diameter of the bolt holes.
The tolerance on perpendicularity between the flange face
and the axis of the connection.
The inner diameter of the suction and discharge nozzle at
the flange face and the concentricity of that diameter
relative to the axis of the connection.