Flashcards in OP 7 - Section III- I-95 Tunnel Deck (20):
Where do doorways & emergency exits lead?
They are placed throughout the covered section. They allow pedestrian travel across roadway to emergency exits located along the front & Delaware ave walls of the tunnel.
Stairwells lead to street level hatches with panic hardware.
Entrance from street level can be gained by using a hydrant wrench to unscrew the brass plug then pull the O ring and handle upward.
Where are the 20 lb ABC extinguishers located?
In close proximity to each doorway and exit. They are wall mounted in a cabinet.
Are there electrical outlets inside the tunnel?
Yes. Located every 180' along the walls. They are 120 volt AC receptacles that run on emergency power circuits.
Are there emergency vehicle crossovers near the tunnel?
Yes. One is located 100 yards south of the Delancy St portal & another one is 100 yards north of the Chestnut St portal. To open gates, break the padlock and remove the steel beam.
Where is the electrical substation located?
At roadway level under the intersection of Front & Spruce Sts. Access can be gained by forcing the door in the west wall of the tunnel (Southbound Lanes). Supplied by a 13,00 volt dual feed (NO READILY ACCESSIBLE CONTROL TO SHUT DOWN POWER)
DO NOT EXTINGUISH, WAIT FOR PECO!!!
Does the electrical substation have ventilation shafts?
Yes. Located in the sidewalks on the NEC & SEC of Front and Spruce Sts. A work men's hatch is located on the NEC of Front & Spruce Sts. To open, obtain a key from security or make forcible entry. (THIS HATCH HAS A SPIRAL STAIRWAY, TOO NARROW FOR ENTRY WITH SCBA)
How do you access the sewage pump room?
It is located under the intersection of Front & Dock Sts. Access is gained via the emergency exit at the NEC of Front & Dock Sts.
This pump is used to relieve storm water run off and excess ground water in the tunnel.
How are the pumps set up in the sewage pump room?
Beneath the floor of the pump room is a large containment put. Water level is controlled by 3 automatic 3,000 GPM sewer pumps. This system can also remove liquid pollutants through a series of skimmers into a 500 gallon holding tank. A tank fill indicator is located on the west wall of the pump room.
DO NOT SHUT DOWN PUMPS- EXCEPT TO PREVENT HOLDING TANK FROM OVERFLOWING. MAINTENANCE OF POLLUTION DEVICES IS HANDLED BY PENNDOT!
Does the sewage pump room have fire protection devices installed to handle flammable liquid spills/fires?
Mechanical ventilation- removes hazardous vapors from pump room. Ventilators are activated by vapor detection devices. If the vapor concentration level doesn't diminish, the detectors then activate the automatic foam system.
Automatic Foam Sprinklers- a pre-action system supplied by a 4" main and a 50 gallon tank of AFFF concentrate proportioned at 3%. Sprinkler heads are in the ceiling of containment pit.
Wet Standpipe connection- a 2 1/2" NST outlet is located at the center of the east wall of the pump room.
50' north of Dock st. is a PFD triamese intake, marked "Pump R" which is used to supplement the system.
What miscellaneous equipment is located in the sewage pump room?
Bell telephone - NEC of pump room.
Explosion proof electrical switches.
Freight elevator- opens on Dock st., east of Front st.
Worker's access hatch- located in sidewalk SEC of Front & Dock Sts.
Electrical service- to the right of the pump room is the electrical service room, obtain key from security or force entry.
Security- guards are stationed in the sewage pump room.
Does the tunnel have a dry deluge sprinkler system?
It is divided into 34 zones. Each is supplied by a triamese connection clustered in 3 groups along front st & Delaware ave. There are 12 zones in the north section and 22 zones in the south section.
SR- southbound ramp zone
ST - southbound main roadway
NR- northbound ramp zone
NT- northbound main roadway
Each sprinkler intake is marked to indicate the zone it pressurizes. In the tunnel the zones are marked on the walls using red and white signs.
How do you pressurize the dry deluge sprinkler system?
Each zone discharges 1000 GPM.
Stretch hose lines to the appropriate intakes. Place the pumper in VOLUME and put 175 PSI on pump discharge.
The system is self draining, no PFD maintenance is needed.
Does the tunnel have a foam fire control system?
Yes. It provides extinguishment capabilities for A MAJOR CLASS B FIRE by introducing foam into the sprinkler system.
Foam room is located 250' north of Dock st in the west wall of the tunnel. The foam room is located at the uncovered center section of the tunnel. Keys access the roadway door and the foam room door. 1st alarm companies have keys. You can also enter from the Front st level, use a hydrant wrench to open the hatch and then the key to open foam room door. A stairway to street level is also located here. This stairwell may be very useful for PFD operations.
How do you activate the foam system for the tunnel?
The foam room contains a 3,000 gallon storage tank of AFFF concentrate, a control panel and 4 foam blending valve keys.
To activate the system:
1.Open the 4 (OS&Y) valves located behind the control panel.
2.Throw the 2 power switches marked Pump #1 & Pump #2 to the ON position.
3.Hit the main pump start button (30 sec delay) AFFF is now pumped to the blending valves located in the ground in front of each intake.
4.Get the 6' T shaped foam blending keys from the foam room, remove blending valve lid in ground in front of intakes and insert key. Key is closed when handle intersects with the roadways.
5. Open valve (1/4 turn, counter-clockwise).
6. Maintain 175 PSI on pump. 1 pumper per zone.
Foam supply lasts for 50 min when supplied to 1 zone.
How many dry standpipe zones are there in the tunnel?
Three. A, C, & D. There is no zone B.
Zone A - Chestnut to Sansom Sts.
Zone C - Dock to Spruce Sts.
Zone D - Spruce to Delancy Sts.
2 intakes per zone.
Pressurizing either intake will supply water to all outlets in that zone. All standpipes are marked with the zone they operate.
Is there any natural ventilation in the tunnel?
Yes. There is a 4'x8' hatch in the roof of each tube in both the north and south covered sections. Remove the bolts and open hinged covers.
Are there forced air fans in the tunnel?
Yes. CO detectors are located throughout the tunnel. These detectors will activate blower fans in the roof when CO levels exceed preset limits. The fans drive fresh air into the tunes, THEY ARE NOT REVERSIBLE! To shut down, make forcible entry into fan room located in park area above the tunnel (north of spruce st) and throw the knife switches to off position.
Are the hydrants located along the east side of front st and the west side of Delaware ave on 16" mains?
What must be done upon completion of service when any of the following have been utilized?
Foam systems, hatches/doors (left unsecured), sewage pump room, electrical issues, forced air/ CO, fire extinguishers.
Have FCC notify PennDot for service.