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No, Hot work is not allowed in such a scenario.

As per Appendix B, point# 5 hot work is not allowed anywhere on the construction site if the standpipe system is out of service.

NYCTBM, INC. A Fireguard Company
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No. There are standards as approved which require to be adhered to.

If a component of a fire protection system regulated by this code that is subject to a voluntary or mandatory recall,

under federal law it shall be replaced with an approved, listed component in compliance with the referenced standards.

A record of the replacement of the component shall be maintained in accordance with Fire Code 107.7.

NYCTBM, INC. A Fireguard Company
Please note: This material is information contained in the F-01 (City-Wide Fire Guard for Impairment) 
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The construction site may continue to be occupied, and construction, demolition or alteration activities may continue, pending such repair and restoration to service,

except:

4.1. as otherwise provided in Section 3303.8.1 of the Building Code; and/or

4.2. as otherwise directed by the commissioner upon a determination that, in the absence of an operable standpipe system, the conduct of certain construction, demolition or alteration activities would be imminently perilous to life or property; and

4.3. that in no circumstance shall hot work be conducted on the construction site until such time as the standpipe system is restored to service and the standpipe alarm reactivated.

NYCTBM, INC. A Fireguard Company
Please note: This material is information contained in the F-01 (City-Wide Fire Guard for Impairment) 
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The owner, fire safety manager and/or impairment coordinator shall take the following actions whenever a standpipe system at a construction site is out of service;

Immediately notify the department of any unplanned out-of-service condition, and otherwise comply with the requirements of Fire Code 901.7.4.

Notify the department at least 24 hours prior to any planned removal of the standpipe system from service, and otherwise comply with the requirements of Fire Code 901.7.3.

Ensure that a fire watch is continuously maintained in compliance with the requirements of Fire Code 901.7.2 while the standpipe system is out of service.

Repair the standpipe system and return it to service in compliance with the requirements of Fire Code 901.7.6 and Section 3303.8.1 of the Building Code.

NYCTBM, INC. A Fireguard Company
Please note: This material is information contained in the F-01 (City-Wide Fire Guard for Impairment) 
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When an out-of-service device, equipment or system is restored to service, the Impairment Coordinator shall do the following

Conduct necessary inspections and tests to verify that the affected systems are operational

Notify the department

Notify the owner, central station, insurance carrier, emergency preparedness staff, and, if previously notified, the occupants in the affected areas

Remove the out-of-service tags

NYCTBM, INC. A Fireguard Company
Please note: This material is information contained in the F-01 (City-Wide Fire Guard for Impairment) 
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Yes, it is mandatory in all cases.

As per code 901.7.5 Notification to department states that

The department shall be notified that a standpipe system, sprinkler system or fire alarm system is out of service, whether by reason of a planned removal from service or an unplanned out-of-service condition, where required by Fire Code 901.7.5.1 through 901.7.5.3.

NYCTBM, INC. A Fireguard Company
Please note: This material is information contained in the F-01 (City-Wide Fire Guard for Impairment) 
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No.

As per code 901.7.4 Unplanned out-of-service condition states 

Any person, upon becoming aware of any condition, except a planned removal from service, rendering a standpipe system, sprinkler system or fire alarm system, or part thereof, inoperable in whole or in part, shall notify the owner and the impairment coordinator of such condition.

The impairment coordinator shall take the actions set forth in Fire Code 901.7.3 and 901.7.5, and such other actions as are necessary or appropriate to protect the occupants of the building and promptly restore the system to service.

NYCTBM, INC. A Fireguard Company
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The Impairment Coordinator has to do the following before authorizing the placing of any Fire Protection system as Out of Service:- 

Notify the Certificate of Fitness holder responsible for supervising the maintenance of the standpipe system, sprinkler system or fire alarm system.

Determine the extent and expected duration of the out-of-service condition.

Inspect the areas or buildings involved and assess the increased risks.

Make appropriate recommendations to the owner.

Notify the department in accordance with Fire Code 901.7.5 if required.

Notify the responsible person designated by the owner to issue hot work authorizations in accordance with Fire Code Chapter 26.

Notify the central station and insurance carrier

Notify the occupants in the affected areas if the duration of time the sprinkler system or fire alarm system will be out of service is estimated to be more than 30 minutes

Place a tag at each Fire Department connection, Standpipe and Sprinkler system control valve and Fire Command Centre, indicating which Fire Protection System, or part thereof, is out of service

Maintain the Fire Protection System in service until work is ready to begin

NYCTBM, INC. A Fireguard Company
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The Impairment Coordinator shall be made aware in advance of any planned removal from service of a standpipe system, sprinkler system or fire alarm system, or system component 

For purpose of repair, servicing, alteration, testing and other maintenance of the system or component, or to allow construction to be performed in the area protected by the system without unnecessarily activating it.

The Impairment Coordinator shall authorize and personally supervise the placing of the fire protection system out of service

NYCTBM, INC. A Fireguard Company
Please note: This material is information contained in the F-01 (City-Wide Fire Guard for Impairment) 
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Fire code 901.7.2.3 Fire watch coverage states as follows,

A sufficient number of Fire Guards shall be provided such that each floor or area in which the fire protection system is out of service is patrolled at least once an hour.

The area to be patrolled by each Fire Guard shall not exceed more than 50,000 square feet (4645 m2) of floor area.

The area patrolled by each fire guard may be further limited by the department depending on the configuration of the premises, impediments to patrol, nature of the occupancy, fire risk, and other fire safety considerations.

NYCTBM, INC. A Fireguard Company
Please note: This material is information contained in the F-01 (City-Wide Fire Guard for Impairment) 
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