The specific characteristics of fire hose are introduced
2022-11-17
1, the fabric layer of the water belt should be woven evenly, the surface is clean; No skipping double warp, broken double warp, skipping and scratch.
2. The thickness of the fabric (or covering layer) of the hose should be uniform, and the surface should be lubricated flat, without wrinkling or other shortcomings.
3. The nominal size and service of the inner diameter of the water belt should conform to the rules of Table 1.
4. The length and ruler of the water belt should conform to the rules in Table 2.
5. The planning working pressure and pressure resistance value of the hose should not be lower than the rules in Table 3.
6. The mass per unit length of the water belt.
(a) The planned working pressure is 0.8MPa, 1.0MPa, 1.3MPa, 1.6MPa of the water belt, the quality per unit length should not exceed the rules of Table 4.
(two) The planned working pressure of 2.0MPa, 2.5MPa water belt, the quality per unit length should not exceed the rules of Table 5.
7, the planned working pressure is 0.8MPa, 1.0MPa, 1.3MPa, 1.6MPa of the water belt, under the planned working pressure of its axial elongation and diameter expansion rate should not be greater than 5%. The expansion rate of axial elongation and diameter should not be greater than 8% for the planned working pressure of the belt of 2.0MPa and 2.5MPa.
8. Under the effect of water pressure, the water belt should not be changed counterclockwise along the direction of the flow. Under planned working pressure, the variation should not be greater than the rule in Table 6.
9, under 0.8MPa water pressure, the water Fairbend into the outside radius as table 7 rules of the arc, the inside of the bending part should have no significant wrinkle.
10. After the adhesion experiment according to 4 and 6, there should be no adhesion between fabrics (or between covering layers).
11, according to 4, 7 low temperature resistance function test, the belt should be able to immediately open, no curling phenomenon, and can be rolled again, and no leakage under the planning of the working pressure.
12. The fabric (or covering layer) shall have the following physical and mechanical functions.
(1) Adhesion strength
The attachment strength between the fabric layer and the fabric (or summer cover) should not be less than 20N/25mm.
(2) Elongation at break
The elongation at break of the fabric (or covering) should be greater than the elongation at break of the fabric layer.
(3) hot air aging
According to 4, 8, 1, 3 hot air aging test, the explosive pressure of the belt and the attachment strength of the fabric (or covering) should not be less than 75 percent of the value measured before aging.
