The TYCO Royal Flush does speak of air flow around the plate in one section of the data sheet but it also shows a positive seal between the plate and ceiling when you purchase the gasketed cover. It’s detailed in the data sheet.
Viking’s cleanroom sprinkler cover assembly also has a built-in gasket to provide a positive seal. You can’t have it both ways, a positive seal and free flow of air through the sprinkler between the cleanroom and ceiling space. If you have airflow through the sprinkler you will not achieve certain level of cGMP, FDA or ISO standards. But like stated before, the term Cleanroom covers a broad array of hygiene so in some cases a simple concealed sprinkler is more than adequate but in other cases a concealed sprinkler alone would not provide adequate infiltration protection. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected] From: Sprinklerforum [mailto:[email protected]] On Behalf Of Ben Young Sent: Wednesday, October 18, 2017 5:00 PM To: [email protected] Subject: Re: Clean Room Sprinkler Options [EXTERNAL] The listing of the concealed sprinkler requires airflow out the top of the clean room lid. I'm going through this now on a project and you cannot seal both sides. If you check with any concealed sprinkler manufacturer they will tell you that airflow out the top of the cup is required. On Wed, Oct 18, 2017 at 4:31 PM Prahl, Craig/GVL <[email protected]<mailto:[email protected]>> wrote: The cover is held on by solder tabs which melt and release the cover when the setpoint temperature of the cover plate is reached. You can also purchase a dust and air seal to prevent air and dust from passing through the cover plate. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected]<mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Mark Sornsin [FAR] Sent: Wednesday, October 18, 2017 4:17 PM To: '[email protected]<mailto:[email protected]>' <[email protected]<mailto:[email protected]>> Subject: RE: Clean Room Sprinkler Options [EXTERNAL] I would also argue that unless the manufacturer declares that the ‘holes in the cup’ cannot be covered, then there may not really be an issue with regard to increased response time (even if the response actually equates more with SR). Moreover, this is a clean room. If the sprinklers are activating it’s too late for the material/equipment in the clean room – they are providing life-safety benefits and controlling a fire to prevent spread to other parts of the building. Does it REALLY matter if it is QR or SR? [Visit our Website at www.SummitCoUS.com]<http://www.SummitCoUS.com> Mark Sornsin Sr. Fire Protection Engineer Direct: 701-499-1391 Cell: 701-526-8585 From: Sprinklerforum [mailto:[email protected]] On Behalf Of Prahl, Craig/GVL Sent: Wednesday, October 18, 2017 7:26 AM To: [email protected]<mailto:[email protected]> Subject: RE: Clean Room Sprinkler Options Cleanrooms come in various classifications. In some cases, you cannot have a standard pendent sprinkler as it would create surfaces where dust and other foreign material could collect and would also be difficult to clean. There is not a perfect sprinkler solution for cleanroom spaces but when you are dealing with pharmaceutical, food, or other consumable and/or regulated materials, the rules for hygiene restrict you from using the same sprinkler you might use at the grocery store. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected]<mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Larry Keeping Sent: Tuesday, October 17, 2017 11:55 PM To: [email protected]<mailto:[email protected]> Subject: RE: Clean Room Sprinkler Options [EXTERNAL] I’m no expert on clean rooms or concealed sprinkler’s etc. and while I think the dry sprinkler with the boot is an interesting concept, but I don’t think it is meant for that type of application. The brochure for the boot says it is intended predominantly for use with clearance holes through freezer ceiling structures. I would advise against using any concealed (or recessed) type sprinklers in a clean room, because they are all vented. I understand this is because the heat from the fire is supposed to flow through the vents up into the ceiling space. Concealed sprinklers have that gap for the cover plate as part of the venting configuration. Even the Reliable “sealing” concealed sprinkler, which seals off the cover plate gap is not allowed in ceilings which have positive pressure. I’ve been told that the reason FM doesn’t sanction Q/R concealed sprinklers is because their testing has found that a Q/R concealed sprinkler’s sensitivity is roughly equal to a standard response sprinkler installed 12 inches below the ceiling. With this, if you interfere with sprinkler’s ability to vent up into the ceiling space, as with a boot tight to the cup (ie. with no clearance hole) or with insulation all around the sprinkler, you must be even more seriously degrading the sensitivity. If it was up to me I’d use a standard pendant sprinkler in clean room applications. Way-back-when, I did some work at Litton systems and they had a special custom fitting/escutcheon with a gasket to make a tight connection to the ceiling, so nothing could transfer from the concealed space into the clean room. Larry Keeping From: Sprinklerforum [mailto:[email protected]] On Behalf Of Prahl, Craig/GVL Sent: October-17-17 4:17 PM To: [email protected]<mailto:[email protected]> Subject: RE: Clean Room Sprinkler Options If you have a LH or OH criteria where the concealed heads can be used, one method that was approved by one of the big insurers for a similar installation used the TYCO DSB-2 dry sprinkler boot on the sprinkler drop. The boot was placed over the drop and sealed against the upper side of the celling panel. The concealed sprinkler used the gasket option on the room side of the sprinkler. This method according to the underwriter had been proven to stop any infiltration into the occupied space from the ceiling cavity. But if you have an EH occupancy, then that’s another story. I would highly recommend contacting the owner’s Risk Consultant or Insurance Underwriter or EOR for input or approval on any method proposed. Since this could be a “H” occupancy I do certainly hope there is a qualified engineer involved in the project. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected]<mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Larrimer, Peter A Sent: Tuesday, October 17, 2017 3:16 PM To: [email protected]<mailto:[email protected]> Subject: Clean Room Sprinkler Options [EXTERNAL] Can anyone please assist with a recommendation for a “clean room” sprinkler where the clean rooms are designed to be negative pressure (for compounding dangerous drugs). The concealed sprinkler cut sheets that I’ve looked at online generally say that the concealed heads cannot be used in negative pressure rooms (positive pressure plenums) and this is the type of room design that we require. The FlexHead cleanroom ceiling sprinkler connection doesn’t appear to be easy to clean after installation. What type of quick response sprinkler could be used in a negative pressure room that is readily and easily cleanable? Users wanted to used concealed sprinklers as they thought that the concealed sprinklers would be easy to wipe down when necessary, but we don’t want to violate the installation instructions on the cut sheets that state that the concealed sprinklers can’t be used with positive pressure plenums (negative pressure rooms). Thanks in advance. Pete Larrimer VA ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. 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