NOTE: The thicknesses for backing flanges noted in the tables are applicable to. steel. Different metals demand different thicknesses for the same performance, so for. metals other than steel, consideration must be given to thickness. Although Tables 4, 5, 6 and 7 in these guidelines make reference to pressure ratings.
Big difference : A subtotal colectomy is removing almost all the colon; usually just a couple of inches are left near the rectum. A partial colectomy is not done AFTER a subtotal colectomy because there is basically no colon left.
For purposes of simplicity, the term colon is often used to refer to any of the components of the large intestine, save the rectum. A colectomy that involves removing the entire colon is called a total colectomy. If most of the colon is removed, the procedure is called a subtotal colectomy. When a segment of the colon is removed, it may be called a segmental colectomy, and it may be labeled a hemicolectomy to differentiate the right and left halves of the large intestine.