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RE: Anchor Chairs Question

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On above ground storage tanks with large diameters, the excess bolt length
above the foundation provides for ease of installation.  The bolt can be
bent to align with the holes in the plate.  With the nut located on top, the
wrench has clearance and ease for tightening.

I suppose you can reverse the location of the plate with care in locating
the anchor bolts and providing clearance for the socket.  Keep in mind that
a slightly miss placed anchor will cause big problems in the field with
installation of the chairs.

Ronald Hill, P.E.
HILL Consulting Engineering
PO BOX 26525
Birmingham, Alabama 35260 USA
Phone: 205.823.4784
FAX: 205.823.4145
Email: ronhill(--nospam--at)hillce.com
Efax: 509.275.8095
http:\\www.hillce.com

-----Original Message-----
From: Cornaby, Sam - EIMCO [mailto:Sam.Cornaby(--nospam--at)eimcoprocess.com]
Sent: Thursday, March 14, 2002 8:38 AM
To: 'seaint(--nospam--at)seaint.org'
Subject: Anchor Chairs Question


List,

In the design of anchorage for tanks, I understand that anchor chairs are
necessary to minimize secondary bending in the shell with anchor tension.
My question is: Why can't a pair of gussets of the same length as the chair
be used instead, with the chair "seat" at the bottom of the tank instead of
being elevated, utilizing much shorter anchor bolts?  Doesn't the tank shell
react the same way to either configuration?  Is the length of the anchor
itself important, independent of the anchor chair?

> Sam Cornaby
> EIMCO Process Equipment Co.
Salt Lake City, UT
801-526-2542

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