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Re: Crane Design; SE v. ME[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Crane Design; SE v. ME
- From: "Bill Sherman" <SHERMANWC(--nospam--at)cdm.com>
- Date: 10 Mar 99 09:50:40 -0500
Drew Norman wrote: >My office has designed a building to support a thirty ton bridge crane. The hoist runs along a bridge spanning 54' between trolleys which in turn run on rails spanning 27' between supports points where they are hung from our roof structure. Reactions at these suspension points were provided to us by the crane supplier. < Please clarify - are the crane runway beams, which are fixed and support the crane rail, designed by your office or the crane manufacturer? In my opinion, the fixed crane runway is definitely a "structural" item and must be designed to resist lateral seismic forces and transmit them to the adjoining structure. >We have asserted that the bridge crane and its rails, which are to be designed by their supplier, are a substantial structure. Our documents call for the design to be submitted to us (for verification of consistency with our design of the supporting structure) under the seal and signature of a licensed SE. We were recently advised that the crane supplier asserts that the crane is a machine, not a structure, and that an SE signature is not required (they have an ME who proposes to sign the documents). < Again, please clarify - did your contract documents state that the design of "the crane" shall be sealed by an SE or just that design "structures" shall be sealed by an SE? If the contract documents clearly spell out the requirements that the crane design be sealed by an SE, then there shouldn't be an argument - do what the contract requires. But if the contract documents are vague regarding the crane design relative to structure design, the manufacturer has a valid argument - a crane is a moving piece of equipment and is not a "structure" per se. You should have a right to require the seal of an SE but only if this requirement is clearly spelled out in the contract documents.
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