Hose Construction
Municipal fire fighting imposes unique requirements for equipment. It is
mandatory that the hose is designed specifically for municipal fire fighting. In
order to meet these unique needs, the finished product shall be abrasion, heat
and kink resistant. It shall be constructed of top quality synthetic yarns woven
into an optimized web to produce high strength and low friction loss. To ensure
complete conformance, the resultant hose must meet the following minimum
requirements or it will be unacceptable.
Hose Physical Properties
Hose shall be evaluated in accordance with the principles and practices listed
in the National Fire Protection Association Standard 1961 (2002 edition) and
related standards.
When tested as such it shall have the following properties:
- Tensile strength of the vulcanized rubber compound used in the hose
shall not be less than
1750 psig.
- Ultimate elongation of the vulcanized rubber compound shall be not less
than 500%.
- Permanent elongation of the vulcanized rubber compound shall be less
than 24%.
- The adhesion between samples of the reinforcement web and either the
liner or the cover shall exceed NFPA 1961 requirements. The sample width
shall be 1 1/2” as called out in the standard.
- When subjected to hot air oven aging at 158°F for 96 hours, the tensile
strength and ultimate elongation shall be at least 75% of the original
values.
- When subjected to an internal static water pressure of 100 psi, the hose
shall withstand a surface temperature of 1200’F for at least 60 seconds
without bursting.
- Hose shall be capable of practical use down to -35°F
- When evaluated in accordance with standards ASTM Dl 149 and ASTM D518,
procedure B, 70 hours at 118°F, l00pphm of ozone, the cover or liner shall
show no visible signs of cracking.
- Contamination by most chemical substances, oils, greases, hydrocarbons,
and exposure to sea water shall have no effect on the short or long-term
performance of the hose.
- Long term use is determined in no small measure by the abrasion
resistance of the cover of the hose. To ensure this is adequate, the hose,
when built to the weights listed, shall withstand the following abrasion
tests:
Factory Mutual Method
Hose shall exceed the Factory Mutual Research Corporation test for abrasion.
This is listed in their Standard 2111 dated May 1995, section 5.8.
Underwriters Laboratories Method
When tested according to the method listed in Underwriters Laboratories Inc.
Standard 219, Hose shall withstand 7,000 cycles on the defined reciprocating
abrasion tester.
Taber Abraser Method
When evaluated against the procedure listed in ASTM D2215 Reinforcement
shall not show signs of damage after 15,000 cycles. Load shall be 2.2 lbs
per wheel and type shall be H22.
- When tested against the procedure listed in MIL STD 24606 the maximum
water absorbance shall be no more than 0.5 lbs in a 50 foot length.
- The hose shall be fitted with lightweight, extruded aluminum alloy, hard
coated, rocker lug couplings. These shall be expansion ring type, NH threads
per NFPA 1963, 2003 edition, or as specified.
Burst, Hydrostatic and Friction Loss Test Data
Hose shall comply with the requirements listed in the tables below and the
requirements of The National Fire Protection Association Standard 1961, 2002
Edition.
Sizes & Pressures
| Size |
Bowl Size |
Service Pressure |
Proof Pressure |
Min. Burst Pressure |
| 1½" |
1-3/16" |
300 psi |
600 psi |
900 psi |
| 1¾" |
2" |
300 psi |
600 psi |
900 psi |
| 2½" |
2¾" |
300 psi |
600 psi |
900 psi |
| 3" |
3-5/16" |
300 psi |
600 psi |
900 psi |
Average Coupled Weights
| Size |
50' |
100' |
50' Coil Diameter |
| 1½" |
15.5 lbs |
30 lbs |
60" |
| 1¾" |
17.75 lbs |
34 lbs |
16½" |
| 2½" |
25 lbs |
50 lbs |
17½" |
| 3" |
32.5 lbs |
62 lbs |
18" |
Average Friction Loss in PSI per 100’ Length
| Flow (US gpm) |
1½" |
1¾" |
2½" |
3" |
| 60 |
7.2 |
3.5 |
|
|
| 70 |
9.9 |
4.7 |
|
|
| 80 |
13.1 |
6.1 |
|
|
| 90 |
16.7 |
8 |
|
|
| 100 |
21 |
9.6 |
1.1 |
|
| 150 |
47 |
21.3 |
2.9 |
|
| 200 |
|
40 |
4.7 |
1.7 |
| 250 |
|
59 |
8 |
3.4 |
| 300 |
|
|
11.8 |
4.6 |
| 350 |
|
|
15.4 |
6.2 |
| 400 |
|
|
20 |
8.1 |
| 500 |
|
|
33.2 |
12.7 |
| 600 |
|
|
|
18.3 |
| 700 |
|
|
|
24.7 |
| 800 |
|
|
|
32.5 |
| 900 |
|
|
|
42 |
|
