I didn't realize it was for a seismic zone which we are not. Thanks for the clarification. Dewayne
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Thom Sent: Monday, July 11, 2011 9:22 AM To: [email protected] Subject: RE: Pipe Sleeves The "Hole" question has two parts. 1: Is there a "Seismic" requirement? 2: If there is no seismic requirement, is there some other requirement by "Spec." or local code? If the answer to question (1) is yes, the 8" sleeve or core is an appropriate alternative to Flex couplings. If the answer to (1) is "NO!" but (2) is yes, then meet the requirements as stated in the requirement. (Size of core {If allowed} or sleeve should be spelled out, if not you only need a "Hole" large enough for the pipe to fit thru. If the answer to both (1) and (2) is no, then no sleeve or core is required. I've seen many contractors just chop a hole in a block wall with a hammer, and patch it back around their pipe with Sakrete. (I'm not recommending that, but it happens and is "legal".) Just some thoughts on sleeve's in general, and that should include core drilled hole's as well. Sleeve's / core's serve many purposes, but some of the original reasons they became part of the "Standard Practice" for all mechanical trades was that they provide for differential expansion, settling of structures, seismic relief, vibration transmission, and ease of repair/replacement. Think of steam lines that expand and contract, passing thru walls. If they are "cemented" in place, the wall either will move, the pipe will deflect, or the joint between the two will fail. All of these can have bad consequences. Steam is probably the most severe example, but the same thing occurs with most mechanical systems. HW, CW, Condensate, steam, refrigeration and yes to a lesser extent FP. Nice 95'F day, you fill a FP system with 55'F water. Pipe contracts. Since you're not doing anything to keep the water at 55'F as it equalizes with the ambient temp. it expands. Same thing happens with ambient temp. change for the seasons. A warehouse may be 100'F at the roof in the summer, but only maintained at 50'F in winter. So even our "Static" system "MOVES" with Temperature. It can transmit vibration. And it's much easier, and less costly to replace a pipe section passing thru a sleeve/core than one "cemented" in place. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dewayne Martinez Sent: Monday, July 11, 2011 4:53 AM To: [email protected] Subject: RE: Pipe Sleeves I know I am late on this one but I have to know. My fitters commonly core a 6in hole in the stair landing for 4in pipe when running standpipes. It looks like we should be coring a 8in hole per 9.3.4.2. Am I reading this correct? Thanks, Dewayne _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
