Hose for providing an emergency fresh air supply to an underground vault after an explosion
A hose for use with a blower and an underground vault. The hose surviving an explosion initiated inside the underground vault. The hose is blast-resistant, arc-flash-resistant, and fire-resistant. A first end of the hose is connectable to the blower and configured to receive fresh air from the blower when connected thereto. The hose conducts the fresh air to a second end of the hose. The second end is positionable inside the underground vault wherein the fresh air provides sufficient breathable air to any personnel present in the underground vault.
1. A system for use with an underground vault having a manhole opening, the system comprising:
a blower; and
a hose that is blast-resistant, arc-flash-resistant, and fire-resistant, the hose comprising first and second ends, the first end being connectable to the blower to receive fresh air from the blower, the hose to conduct the fresh air to the second end, a portion of the hose between the first and second ends to extend through the manhole opening and into the underground vault, the fresh air to provide sufficient breathable air to any personnel present inside the underground vault after an explosion has occurred inside the underground vault, the hose being constructed from at least one hose material that withstands effects of an arc flash having a magnitude of at least 15 kA and occurring in the underground vault, the at least one hose material including one or more of the following materials: poly-paraphenylene terephthalamide (“para aramid”) fibers, ultra-high molecular weight polyethylene, polycarbonate, a carbon fiber composite, steel, or titanium.
2. The system of claim 1 , further comprising:
a first hose anchor to anchor the hose at or near the manhole opening and hold the hose in place with respect to the underground vault.
3. The system of claim 2 , further comprising:
a second hose anchor positionable inside the underground vault to anchor the second end of the hose to a floor of the underground vault.
4. The system of claim 1 , further comprising:
a hose anchor positionable inside the underground vault to anchor the second end of the hose to a floor of the underground vault.
5. The system of claim 1 , wherein the explosion is at least one of an electrical arc flash and a chemical explosion.
6. The system of claim 1 , wherein the at least one hose material self-extinguishes in less than a predetermined amount of time from an end of an arc flash event.
7. The system of claim 6 , wherein the predetermined amount of time is 30 seconds.
8. The system of claim 6 , wherein the at least one hose material includes one or more of the following materials: polybenzimidazole, poly-meta-phenylene isophthalamide (“meta-aramid”) fibers, flame retardant cotton, coated nylon, carbon foam, polyhydroquinone-dimidazopyridine, melamine, modacrylic, or leather.
9. The system of claim 1 , wherein the at least one hose material comprises an outer layer constructed of a flame retardant material.
10. The system of claim 1 , wherein the at least one hose material comprises:
an inner layer constructed of a first material that is both blast resistant and arc-flash-resistant; and
an outer layer constructed of a flame retardant material.
11. A hose for conducting fresh air from a blower to an underground vault having a manhole opening, the hose comprising:
a first end to be connected to the blower to receive the fresh air from the blower; and
a second end to be positioned inside the underground vault and to provide the fresh air to an interior of the underground vault, the fresh air to provide sufficient breathable air to any personnel present inside the underground vault after an explosion has occurred inside the underground vault; and
an intermediate portion to extend through the manhole opening and into the underground vault to position the second end inside the underground vault, the hose being constructed from at least one hose material that renders the hose blast-resistant, arc-flash-resistant, and fire-resistant, the at least one hose material to withstand effects of an arc flash having a magnitude of at least 15 kA and occurring in the underground vault, the at least one hose material including one or more of the following materials: poly-paraphenylene terephthalamide (“para aramid”) fibers, ultra-high molecular weight polyethylene, polycarbonate, a carbon fiber composite, steel, or titanium.
12. The hose of claim 11 , wherein the at least one hose material is to self-extinguish in less than a predetermined amount of time from an end of an arc flash event.
13. The hose of claim 12 , wherein the predetermined amount of time is 30 seconds.
14. The hose of claim 12 , wherein the at least one hose material includes one or more of the following materials: polybenzimidazole, poly-meta-phenylene isophthalamide (“meta-aramid”) fibers, flame retardant cotton, coated nylon, carbon foam, polyhydroquinone-dimidazopyridine, melamine, modacrylic, or leather.
15. The hose of claim 11 , wherein the at least one hose material comprises an outer layer constructed of a flame retardant material.
16. The hose of claim 11 , wherein the at least one hose material comprises:
an inner layer constructed of a first material that is both blast resistant and arc-flash-resistant; and
an outer layer constructed of a flame retardant material.
17. A method comprising:
connecting a first end of a hose that is blast-resistant, arc-flash-resistant, and fire-resistant to a blower, the blower to supply fresh air to the first end of the hose, the hose being constructed from at least one hose material to withstand effects of an arc flash having a magnitude of at least 15 kA and occurring in an underground vault, the at least one hose material including one or more of the following materials: poly-paraphenylene terephthalamide (“para aramid”) fibers, ultra-high molecular weight polyethylene, polycarbonate, a carbon fiber composite, steel, or titanium;
dropping a second end of the hose through a manhole opening of the underground vault, the hose conducting the fresh air to the second end, which discharges the fresh air into an interior of the underground vault;
entering, by a human worker, the interior when dangerous gases inside the interior are at a safe level; and
allowing the hose to continue discharging the fresh air into the interior of the underground vault after an explosion occurs and while the human worker is inside the interior, the discharged fresh air providing sufficient breathable air to the human worker in the interior of the underground vault after the explosion.
18. The method of claim 17 , further comprising: anchoring the hose at or near the manhole opening to hold the hose in place with respect to the underground vault.
19. The method of claim 18 , further comprising:
anchoring the hose at or near the second end of the hose.
20. The method of claim 17 , further comprising:
anchoring the hose at or near the second end of the hose.
21. The method of claim 17 , wherein the explosion is at least one of an electrical arc flash and a chemical explosion.
22. The method of claim 17 , wherein the at least one hose material self-extinguishes in less than a predetermined amount of time from an end of an arc flash event.
23. The method of claim 22 , wherein the predetermined amount of time is 30 seconds.
24. The method of claim 17 , wherein the at least one hose material includes one or more of the following materials: polybenzimidazole, poly-meta-phenylene isophthalamide (“meta-aramid”) fibers, flame retardant cotton, coated nylon, carbon foam, polyhydroquinone-dimidazopyridine, melamine, modacrylic, or leather.
25. The method of claim 17 , wherein the at least one hose material comprises an outer layer constructed of a flame retardant material.
26. The method of claim 17 , wherein the at least one hose material comprises:
an inner layer constructed of a first material that is both blast resistant and arc-flash-resistant; and
an outer layer constructed of a flame retardant material.