MOWLE Kevin(K) - BRUCE POWER wrote:
Yes the HADs are for the Automatic Sprinkler Deluge valves that use HADs
in series, a bank of mercury check valves and a diaphragm for the
initiation of the deluge valve. The 'alarm' interpretation is a bellows
on the air circuit which sends an alarm signal to the fire detection
system. I am interpreting the HADs as initiation devices however some
here disagree.
Kevin
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ford,
Charles
Sent: Thursday, March 29, 2007 4:26 PM
To: [email protected]
Subject: RE: heat activated devices for a deluge system.
Pneumatic rate-of-rise detection has been in use as fire alarm since
long before there was electric
detection. HAD is a spot type of pneumatic rate-of-rise detection
(versus linear type). It was the
primary method of releasing early CO2 systems, I have seen it in water
curtain applications in older
shopping malls . They are surprisingly sensitive to temperature change.
Rugged, reliable with no
power requirements but NOT SUPERVISED.
I would follow NFPA 72 testing schedules. They can be successfully proof
tested with hot water, but a
manometer is required to accurately test sensitivity. Automatic
Sprinkler CO of America is the last
manufacturer of manometers for this purpose that I'm aware of.
Burton Ford
SET, CFPS
Member AFAA
[EMAIL PROTECTED]
267-487-1000
Fax 267-487-1010
This e-mail transmission contains information that is intended to be
confidential and privileged. If
you receive this e-mail and you are not a named addressee you are hereby
notified that you are not
authorized to read, print, retain, copy or disseminate this
communication without the consent of the
sender and that doing so is prohibited and may be unlawful. Please
reply to the message immediately
by informing the sender that the message was misdirected. After
replying, please delete and otherwise
erase it and any attachments from your computer system. Your assistance
in correcting this error is
appreciated. Thank you. Cintas Corporation
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of MOWLE Kevin(K) - BRUCE POWER
Sent: Thursday, March 29, 2007 2:29 PM
To: [email protected]
Subject: heat activated devices for a deluge system.
Are heat actuated devices (HADS) used to initiate a deluge system via a
pneumatic signal considered:
1- a heat detector and so the required testing is per NFPA 72 ?
2- or are the HADS considered part of the deluge system so testing
requirements as per NFPA 25 ?
Thanks
Kevin Mowle
Bruce Power
Tiverton, ON
guess
************************************************************************
**************************
*** The contents of this email and any attachments
*** are confidential and may be privileged.
*** They are intended for the named recipient(s) only.
*** If this message has been delivered to you in error, please reply to
the
*** sender to that effect, don't forward the message to anyone
*** and delete the message from your computer.
*** Thanks for your help, and sorry for the inconvenience.
************************************************************************
**************************
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
To Unsubscribe, send an email
to:[EMAIL PROTECTED]
(Put the word unsubscribe in the subject field)
This e-mail transmission contains information that is intended to be
confidential and privileged. If you receive this e-mail and you are not
a named addressee you are hereby notified that you are not authorized to
read, print, retain, copy or disseminate this communication without the
consent of the sender and that doing so is prohibited and may be
unlawful. Please reply to the message immediately by informing the
sender that the message was misdirected. After replying, please delete
and otherwise erase it and any attachments from your computer system.
Your assistance in correcting this error is appreciated.
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
To Unsubscribe, send an email
to:[EMAIL PROTECTED]
(Put the word unsubscribe in the subject field)
**************************************************************************************************
*** The contents of this email and any attachments
*** are confidential and may be privileged.
*** They are intended for the named recipient(s) only.
*** If this message has been delivered to you in error, please reply to the
*** sender to that effect, don’t forward the message to anyone
*** and delete the message from your computer.
*** Thanks for your help, and sorry for the inconvenience.
**************************************************************************************************
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
To Unsubscribe, send an email to:[EMAIL PROTECTED]
(Put the word unsubscribe in the subject field)
Kevin,
Having worked on many of these systems at various power plants, I will
offer my $0.02 worth. The HAD's and connected tubing are supposed to be
under 20-24 oz of air pressure. A heat source will cause the pressure to
increase. If it increases faster than the compensating vent on top of
the mercury check can vent, the system trips. The weight on the side of
the release mechanism drops and typically the electric switch on the
back of the box containing the release mechanism sends the fire alarm
signal. The arm from this switch sits on a small piece of angle attached
to the weight. IMHO the HAD's are not devices to be tested per NFPA 72;
however this does not negate the need to test them. I normally use a
heat lamp and time the trip of the deluge valve. With only 6 HAD's being
allowed on one circuit of tubing, this time is rarely over 35 seconds.
The weight switch is the item that must be tested relative to NFPA 72.
When installed properly, these systems also have air pressure in the
system piping and a low air pressure switch to send a signal when the
air in the piping drops to a certain point. Some of these systems also
have an electric solenoid inside the release mechanism. This solenoid
will allow for the system to be tripped electrically as from smoke
detectors. We have in the past installed linear wire heat detection and
used this to trip the deluge valve when the pneumatic detection was past
the point of salvage. Hope this helps. Call with any questions that I
might be able to answer.
Jim Deason
Priority Fire Protection, Inc.
770-924-2829
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
To Unsubscribe, send an email to:[EMAIL PROTECTED]
(Put the word unsubscribe in the subject field)
