What can we make from the following?
Records indicate that on September 3rd at 5:16 am and on September 5th at 13:52 pm the alarms were set off in B7 apparently by construction.
The West Broadway Subway was only 5 feet from the East wall of B7. This is the area where we find damage to the Subway.
B7 was moved in a Westward direction away from the subway.
Records indicate that on September 3rd at 5:16 am and on September 5th at 13:52 pm the alarms were set off in B7 apparently by construction.
The West Broadway Subway was only 5 feet from the East wall of B7. This is the area where we find damage to the Subway.
B7 was moved in a Westward direction away from the subway.
WTH??
I was just reading about the alarm system this afternoon. Check this out.
QUOTE
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The fire alarm history tape record is read from the bottom to the top. Some entries occur as the result of normal operations, and others are the result of actions taken by operators. The bottom line of the record shows that at 6:05:01 a.m. on September 11, 2001, the fire alarm system completed a normal communications check with the central monitoring station. This check was made every day.
At 6:47:02 a.m., AFA placed WTC 7 in a “TEST: ALL” condition. This was normally done in response to a request from the building manager. Ordinarily, it was requested when maintenance or other testing was being performed on the system, so that any alarms received from the system were considered the result of the maintenance or testing and were ignored. NIST was told by AFA that for systems placed in the TEST condition, alarm signals were not shown on the operator’s display, but records of the alarm were recorded into the history file.
At 6:47:03 a.m., the record includes an explanation of the request to put the system in the TEST condition. Continuing to read from bottom to top, the date and time the system was placed in TEST was recorded. In this case it was 091101 647 (6:47 a.m., September 11, 2001), and the system would have automatically gone back to normal monitoring after eight hours, a system default value, at 091101 1447 (September 11, 2001, 2:47 p.m.). On the next line above, “RIC” identifies the AFA operator; 4210 is a code number for the “PLACE ON TEST” message. CAT:11 indicates the authority of the person requesting the action, identified in the next line as Williams. Records indicated that the building alarm system was often placed on test.
At 10:00:52 a.m., a fire condition [1510 CO TO CLASS E] was indicated in WTC 7. The *T at the right end of that record indicates that the system was in TEST at the time. The alarm record also shows that the fire condition was in AREA 1. NIST has been told by AFA that AREA 1 was not a specific area within the building, but referred to the entire building. In other words, a fire detected in any fire alarm zone in the building would have resulted in the same AREA 1 identification at the monitoring station. The time, 10:00:52 a.m., is shortly after the collapse of WTC 2. NIST could not determine whether this fire alarm was triggered by smoke from a fire or by dust entering smoke detectors. None of the interviews conducted by the Investigation Team contained any mention of an alarm received at the Fire Command Station.
At 2:47:21 p.m. and 2:47:22 p.m. (14:47:21 hr and 14:47:22 hr), at the time the eight hour “TEST: ALL” condition was set to expire, additional actions were recorded that ended in an operator (DYJ) entry to “FULL CLEAR.” Since there were several large fires in the building at this time (Section 5.6), it appears that either the building alarm system was not functioning after about 2:47 p.m. (and probably after
10:01 a.m.), or that the offsite monitoring system or its link to WTC 7 was incapacitated in some way.
A much greater amount of information would have been collected and recorded by the fire alarm equipment within WTC 7. None of that information was recovered from the building systems, which were destroyed in the collapse. Typically, and in the case of WTC 7, specific fire information beyond the fact that a fire condition has been detected is rarely sent to the monitoring site.
The fire alarm history tape record is read from the bottom to the top. Some entries occur as the result of normal operations, and others are the result of actions taken by operators. The bottom line of the record shows that at 6:05:01 a.m. on September 11, 2001, the fire alarm system completed a normal communications check with the central monitoring station. This check was made every day.
At 6:47:02 a.m., AFA placed WTC 7 in a “TEST: ALL” condition. This was normally done in response to a request from the building manager. Ordinarily, it was requested when maintenance or other testing was being performed on the system, so that any alarms received from the system were considered the result of the maintenance or testing and were ignored. NIST was told by AFA that for systems placed in the TEST condition, alarm signals were not shown on the operator’s display, but records of the alarm were recorded into the history file.
At 6:47:03 a.m., the record includes an explanation of the request to put the system in the TEST condition. Continuing to read from bottom to top, the date and time the system was placed in TEST was recorded. In this case it was 091101 647 (6:47 a.m., September 11, 2001), and the system would have automatically gone back to normal monitoring after eight hours, a system default value, at 091101 1447 (September 11, 2001, 2:47 p.m.). On the next line above, “RIC” identifies the AFA operator; 4210 is a code number for the “PLACE ON TEST” message. CAT:11 indicates the authority of the person requesting the action, identified in the next line as Williams. Records indicated that the building alarm system was often placed on test.
At 10:00:52 a.m., a fire condition [1510 CO TO CLASS E] was indicated in WTC 7. The *T at the right end of that record indicates that the system was in TEST at the time. The alarm record also shows that the fire condition was in AREA 1. NIST has been told by AFA that AREA 1 was not a specific area within the building, but referred to the entire building. In other words, a fire detected in any fire alarm zone in the building would have resulted in the same AREA 1 identification at the monitoring station. The time, 10:00:52 a.m., is shortly after the collapse of WTC 2. NIST could not determine whether this fire alarm was triggered by smoke from a fire or by dust entering smoke detectors. None of the interviews conducted by the Investigation Team contained any mention of an alarm received at the Fire Command Station.
At 2:47:21 p.m. and 2:47:22 p.m. (14:47:21 hr and 14:47:22 hr), at the time the eight hour “TEST: ALL” condition was set to expire, additional actions were recorded that ended in an operator (DYJ) entry to “FULL CLEAR.” Since there were several large fires in the building at this time (Section 5.6), it appears that either the building alarm system was not functioning after about 2:47 p.m. (and probably after
10:01 a.m.), or that the offsite monitoring system or its link to WTC 7 was incapacitated in some way.
A much greater amount of information would have been collected and recorded by the fire alarm equipment within WTC 7. None of that information was recovered from the building systems, which were destroyed in the collapse. Typically, and in the case of WTC 7, specific fire information beyond the fact that a fire condition has been detected is rarely sent to the monitoring site.
There was also this
QUOTE
The caissons were socketed (seated) in the bedrock, approximately 60 ft below the surface. There were vertical caissons as well as battered (or sloped) caissons to carry the lateral load. Above the caissons were heavy grillages composed of built up steel girders. Grillages transferred loads between the building columns and the caissons.
And of course columns 79, 80 and 81 running along the east face
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That info blew me away guys. Excellent digging!










And the elevators

