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RE: Mill tests - handrail and post criteria

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We ran into this several years ago while performing a Walking-Working
surface survey for an industrial client.

The post were ASTM A53, 1.25" pipe. I was looking at major replacement work.

We designed a full scale test of the post and loaded it to failure. There
was no yielding at 500 pounds. Nor was there significant deflection. We left
all the 1.25" pipe post/handrails inplace and use 1.25" pipe for standard
post and handrails.

Bill Scott, P.E., S.E.
Principal Engineer
VECO Alaska, Inc.
949 E. 36th Street
Anchorage, AK  99508
Phone 907-762-1655, FAX 907-762-1734

-----Original Message-----
From: Jason Kilgore [mailto:jkilgore(--nospam--at)]
Sent: Tuesday, December 12, 2000 6:58 AM
To: seaint(--nospam--at)
Subject: Re: Mill tests

> This is a question I've have dealt with for years and have resolved using
> the following simple logic.
> If you check the stress level of a cantilevered 1-1/4" std. pipe for a
> railing post using the 200# lateral force at the top using a 42" height,
> will overstress the pipe (fb=35.74 ksi).  A 1-1/2" std. pipe fb=25.77 ksi
> which is 73.6% of yield (Fy=35 ksi).  I use 1-1/2" pipe to avoid yielding
> the pipe.

That's what our office normally does, and is what started the whole thread.
The fabricator on a project, however, wanted to use A500 HSS 1.660"x 0.140 .
He provided a mill test certification indicating a yield of 63,000 psi for
the actual pipe to be used (minimum yield is 42,000 psi).

The HSS 1.660"x0.140 will work as far as stress is concerned.

Jason W. Kilgore
Leigh & O'Kane, L.L.C.
(816) 444-3144