By Anthony Rowett Jr.
Photo by Tony Greco
The primary focus of engine company operations is the initialattack line, and rightly so. As stated by the lateLt. Andrew Fredericks(FDNY) “Stretching and advancing the initial attack line is the most fundamental and important task an engine company has to perform.” When responding to a structure fire, usually only the initial arriving engine company will performthe initial attack lineoperation, however. Other respondingengine companiesmust be prepared to perform a different operation. Some departments assign the second-arriving engine company to rapid intervention, or perhaps the second handline. Regardless of which company is assigned to the second handline, the operation must be performed effectively.
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When assigned the task of stretching, advancing, and operating the second handline, you first must decide what tactical function the handline will perform. The second handline can be operated as a backup line for theinitial attack line或作为第二攻击线。许多因素都应该assessed when making this decision, including the location and size of the fire, the effectiveness of the initial attack line, and the likelihood of fire spread. These last two are critically important considerations for your decision. If the progress being made by the initial attack line is determined to be insufficient or if fire spread is likely, a second attack line may be needed rather than a backup line.
Probably the most common use for the second handline is as a backup line, especially when it comes to fires in private dwellings. In such cases, the mission of the second handline is to support the initial attack line, not operate alongside it. Although all firefighters want to advance the hoseline to the fire area and attack, when assigned to the backup line, firefighters must be able to control this urge and instead focus their actions on the mission of supporting the initial attack line. Backup line firefighters should not allow themselves to stray from their responsibilities.
When thesecond handlineoperate as a backup line, hoseline selection may differ from that of the initial attack line. Although the company officer assigned to the backup line operation should perform his or her own size-up of the building and determine the correct hoseline, the initial attack line should also be factored in. When possible, the backup line should be at minimum the same size as the initial attack line if not larger. Selecting a larger hoseline allows the backup line to provide protection for the attack team in the event that their line proves insufficient. This would also allow the backup line to take over the initial attack operation and continue the advance to the seat of the fire.
估计软管伸展的备份ne also varies. The backup line should be at least one section of hoseline (50 feet) longer than the initial attack line. This is to provide the same benefit as using a larger hoseline. Should the initial attack line stretch short, the backup line can be advanced from its position behind the initial attack line to perform the fire attack. The company officer assigned to the backup line should not simply add one length of hoseline to the length of the initial attack line when making this determination. Instead, the backup line company officer must perform his or her own estimate of the stretch. One way to do this is use the rules of thumb for estimating a hose stretch that have been developed by Fredericks:
- Private dwellings up to three stories: between one and three lengths
- Two-storygarden apartments: two lengths
- Three-story garden apartments: three lengths
- Small multiple dwellings (frontage of 35 feet or less and a depth between 50 and 75 feet): same as the floor number of the fire floor (for example, a fire on the fourth floor requires a hose length of four lengths)
- Large multiple dwellings (frontage from 36-100 feet and depths up to 100 feet): floor of fire floor plus one length
- Typical businesses (single-story or first floor or taxpayer buildings): one or two lengths
When using these rules of thumb, the company officer must remember that the estimates are only of the fire building itself; they must also estimate the distance from the apparatus to the building entrance and then add that length to the hoseline.
Another method for estimating the stretch is to break it down into three sections:
- Fire area
- Fire area to building entrance
- Building entrance to apparatus
Beginning at the fire area and working backwards to the apparatus, the company officer can then size up the building and estimate the proper length for the hoseline. When using method, the company officer should ensure that at least one length of hoseline (50 feet) is provided for the fire area itself. At least one length of hoseline (50 feet) should also be provided for each floor from the fire area to the building entrance. Finally, the amount of hoseline needed to span the distance between the building entrance and the apparatus must be determined. These three sections are added together for the final length.
One of the biggest issues that tends to arise, particularly in private dwellings, is the “piling in” of firefighters into a small area that impedes the advancement of the initial attack line. Positioning the backup line and its firefighters is essential to the mission. When backup line firefighters advance into the fire building until they reach the initial attack line nozzle team, the result is many times a decrease in the effectiveness of the attack line because of too many members packed into a tight area. Rather than positioning the backup line in a position that impedes the attack team, firefighters operating the backup line must position themselves and the line in a location to improve fire attack effectiveness. A good way to accomplish this is for the nozzle of the backup line to be positioned one length of hoseline (50 feet) behind the initial attack line nozzle. This positioning allows the initial attack team room to work yet allows the backup line members to assist with the advancement of the initial attack line. There are very few departments with large enough staffing levels to allow for fully staffed hoselines. The result is that most departments must operate hoselines without a door firefighter or control firefighter. Once in position, the backup line firefighters can essentially perform some of the functions of the door/control positions for the initial attack line. Backup line can assist in feeding slack to the initial attack team during hoseline advancement and help manage turns and other pinch points for the initial attack line. Another common method, especially at private dwelling fires, is to position the nozzle of the backup line one room behind the initial attack line nozzle team of the initial attack line. Positioning to protect the stairway used by the initial attack line is another potential tactic.
The second handline can also be used as a second attack line—a very different function than operating as a backup line. The three most common reasons for this decision is the ineffectiveness of the initial attack line, the likelihood of fire spread, and the presence of a large basement/cellar fire. When operating as a second attack line, the second handline may operate alongside the initial attack line or it may operate remotely, depending on the needs of the incident.
In situations where the initial attack line is not making progress in knocking down the fire, a second attack line can be advanced to operate alongside the initial attack line. This second attack line is typically the same size hoseline as the initial attack line, although a larger hoseline can be used. Do not use a smaller size hoseline for the second attack line. It is a good practice for the second attack line to be one length (50 feet) longer than the initial attack line just in case the latter comes up short.
In situations where fire spread is likely, it is not uncommon for a second attack line to be advanced into areas remote from the location where the initial attack line is operating with the mission of searching for fire extension and extinguishing any fire that has spread into these areas. This may include advancing a second attack line to the floor above the fire or into exposure buildings. When the second attack line will be advanced to the floor above the fire floor, an additional length of hoseline (50 feet) must be added to it, above and beyond the length of the initial attack line. This additional length will allow the second attack line greater penetration of the area.
Basement/cellar fires are another situation where a second attack line is commonly advanced. Although a small basement/cellar fire is typically extinguished by the initial attack line, a large basement/cellar fire will require the advancement of a second attack line. Regardless of the size of the fire, in such scenarios it is common practice for the initial attack line to enter the fire building on the first floor and advance to a position at the top of the stairway leading down to the basement/cellar. This enables the initial attack line to protect the stairway from fire spread, confining the fire to the basement/cellar area. For small fires, the initial attack line will be able to advance down the stairway into the basement/cellar to performextinguishment。当火更大且更高级时，第二个攻击线应提升到两个位置之一。如果存在地下室/地窖的等级水平入口，则应将第二个攻击线提升到该位置。然后，它将前进到地下室/地窖并扑灭大火，而最初的攻击线则保持在内部楼梯的顶部，以保护楼梯免受火势蔓延。必须有足够长的时间到达等级入口并到达地下室/地窖的所有区域。必须注意第二次攻击线的软管伸展运动的适当估计，因为在许多情况下，第二次攻击线将需要在火灾建筑物的后部延伸到地下室/地窖之前。如果不存在地下室/地窖的等级水平入口，则第二个攻击线应与初始攻击线相同的位置，即通向地下室/地窖的内部楼梯的顶部。一旦将第二个攻击线放置在局面，初始攻击线就会从内部楼梯下方升级以扑灭大火。除非应初始攻击线机组人员的要求，否则第二次攻击线将不会向下提升到地下室/地窖，在这种情况下，它将被第三次攻击线代替。取而代之的是，第二次攻击线保持了内部楼梯顶部的位置，并保护内部楼梯免受火灾蔓延，同时还确保没有火势蔓延到建筑物的一楼的其他区域。 In these situation, the second attack line operation is very similar to the operation of a second attack line operating onthe floor above the fire floor。
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During interior188金博网网址多少operations, the second handline can operate as either a backup line or a second attack line. Firefighters should be comfortable in performing either operation as well as understand when each operation is necessary. Members must also understand the importance of their role in each operation in relation to the overall fireground operation. A backup line that positions itself in the way of the initial attack line is ineffective and a detriment to the overall fire operation, as is a second attack line that is not advanced into the proper location. You cannot always be first in; understand the operation of the second handline so that you can effectively support or supplement the initial attack line.
Anthony Rowett Jr.is a captain with the Mobile (AL) Fire Rescue Department. He was previously a firefighter for the Ogdensburg (NJ) Fire Department. Rowett has an associate’s degree in fire science technology from the County College of Morris in New Jersey and a bachelor’s and master’s degree in fire science and emergency services management, respectively, from Columbia Southern University. He has been published in Fire Engineering and Fire Rescue. He can be contacted atarowett88@yahoo.com。
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