SCOPE
Quality:
The
fire hose to be supplied under this specification is a premium quality,
double jacket municipal fire hose. All materials used in the
fabrication of the hose shall be of the best quality commercially
available.
Service Life:
The fire hose furnished under the terms of this proposal has a potential
service life of 10 years, barring mistreatment or accidental damage that
would render the hose unfit for service. Upon delivery, the fire hose
shall be in first-class condition free from defects in workmanship and
materials. The supplier shall provide replacement of any such hose as
may be defective without any charge whatsoever to the Fire Department.
TECHNICAL
INFORMATION
NFPA
Standard:
The hose must meet all the requirements of NFPA 1961, Standard
on Fire Hose (2002 Edition).
Jackets:
The jackets shall be evenly and firmly woven, free from unsightly
defects, dirt, knots, lumps, and irregularities of twist that might
affect the serviceability of the finished product.
Each jacket shall be seamless and shall have polyester filler yarns
woven around the hose throughout its length, with the warp ends
interwoven with warp yarn and covering the filler yarn.
Warp ends of both the inner and outer jackets shall be nylon 6,6
entangled filament yarn, allowing outer jacket to be impregnated with an
abrasion resistant, water repellant, heat resistant compound. The use
of polyester or staple yarns in the warp is not allowed.
Filler yarns of both the inner and outer jackets shall be high-tenacity
filament polyester developed, designed, and processed for fire hose
jacket filler yarns. These filament polyester yarns shall be free from
defects that are unsightly or may affect the serviceability of the
finished hose. The entangled nylon warp ends must completely cover and
protect the filament polyester filler yarns.
Impregnation:
Each outside jacket shall be completely impregnated by a mechanical
process to provide coverage of an abrasion-resistant, water-repellent,heat
resistant compound prior to the jackets and liner being combined.
Coating applied to finished hose, allowing varied absorption to the
inside jacket, is not acceptable.
Lining:
The rubber lining shall be a single ply extrusion of EPDM polymer which
naturally resists ozone and oxidation. Styrene butadiene rubber (SBR)
which is not a natural resistor is Not Acceptable. Thermoplastic liners
such as polyurethane are also Not Acceptable. The surface must be
smooth and free from corrugations. The lining thickness shall be
tightly controlled to reduce weight and kink radius.
Thickness:
1½”, 1¾, & 2½”: 0.034 to 0.046”
3”: 0.042 to 0.046”
Tensile Strength:
1600 psi minimum.
Elongation:
400% minimum (1” to 6”)
Ozone
Resistance:
Lining specimens shall be subjected to ASTM D 1149-91, “Standard Test
Method for Rubber Deterioration — Surface Ozone Cracking in a Chamber”.
Specimens shall be prepared in accordance with ASTM D 518-86, “Standard
Test Method for Rubber Deterioration — Surface Cracking”, Procedure C,
and shall be elongated 15%. Ozone concentration shall be 100+/- 5 parts
per hundred million by volume. Temperature shall be 40.0° +/- 1.0° C
(104° F). Time shall be 100 hours
There shall be no
appearance of cracking or crazing when viewed under a 7-power magnifying
glass at any time during or at the end of the 100 hour exposure.
Accelerated
Aging:
Lining specimens shall be subjected to ASTM D573-88, “Standard Test
Method for Rubber — Deterioration in an Air Oven”. Specimens shall be
exposed to 70° +/- 1° C temperature for a duration of 166 +/- 2 hours
and shall be allowed to rest for 24 +/- 1 hours before testing. The
tensile strength and ultimate elongation of the rubber lining after
aging shall not be less than 75 percent of the original tensile and
elongation.
Adhesion:
The adhesive must be of uniform thickness around the circumference of
the lining. Calendered adhesive with an overlap is Not Acceptable. The
adhesion shall be such that the rate of separation of a 1½” strip of
lining, transversely cut, shall not be greater
than 1” per minute
under a weight of 18 lbs. - - No Exceptions. Thickness of liner and
adhesive shall not exceed 0.052” for 1½” through 2½” hose, and 0.062”
for 3” hose.
Low
Temperature Flexibility:
The hose shall be capable of performing in extreme cold temperature
conditions. A 3-foot section of hose shall be exposed to a temperature
of -54° +/- 2° C (-65° +/-3° F) for a period of 24 hours. At the end of
the exposure period, and while maintained at the -55°C exposure
temperature, the hose shall be rapidly bent 180° double on itself, first
one way and then the other. There shall be no cracking or breaking of
the jacket or liner. Leakage shall be cause for rejection.
Hydrostatic
Test:
(A)
Hydrostatic tests shall be conducted on hose equipped with the couplings
to be delivered in accordance with NFPA 1961.
(B)
Each length of hose is to be subjected to a hydrostatic proof test
pressure of 800 psig for at least 15 seconds and not more than 1
minute. Higher test pressures which may weaken the hose are expressly
forbidden.
(C)
Twist: The hose shall not twist more than 4-1/4 turns per 50 ft for the
1½”, 1¾”, and 2” sizes, and not more than 1¾” per 50 ft for the 2½” and
3” sizes under a pressure of 800 psig. No final twist in a direction to
loosen the couplings shall be permitted.
(D)
Warp: The hose shall not warp more than 20” from a straight line drawn
from center to center of the fittings at the ends of the hose, and the
hose shall not rise from the table.
(E)
Expansion: The expansion in
circumference of the hose between 10 and 800 psig shall not exceed 8%.
(F)
Elongation: The elongation
between 10 and 800 psig shall not exceed 8% for the 1½, 1¾”, 2”, and 2½”
sizes, and shall not exceed 10% for the 3” size.
Burst Test:
A 3-foot sample of hose chosen at random shall stand without failure a
hydrostatic pressure of 1200 psig while lying straight or curved on a
27” radius. Retention of the coupling to the hose shall equal or exceed
the burst pressure.
Kink
Test:
A full length shall withstand, while kinked, without failure, a
hydrostatic pressure of 600 psig.
Diameter:
The hose shall have an internal diameter of not less than the trade size
of the hose, except that internal diameter of the 2½” hose shall not be
less than 2-9/16”.
Weight
Chart:
|
Hose Size |
Proof Test
Pressure. |
Service
Test Pressure |
Burst Test
Pressure. |
Kink Test
Pressure |
Cplg Bowl
Size (in.) |
Weight per
50' Uncpld. (Lbs) |
Coil
Diameter Per 50' (in.) |
Flat Width |
|
1-1/2" |
800 |
400 |
1200 |
600 |
1-15/16" |
15 |
18 |
2-11/16" |
|
1-3/4" |
800 |
400 |
1200 |
600 |
2-1/8" |
17 |
18 |
3-1/8" |
|
2-1/2" |
800 |
400 |
1200 |
600 |
3" |
28 |
20 |
4-1/4" |
|
3" |
800 |
400 |
1200 |
600 |
3-9/16" |
33 |
21 |
5-1/4" |
