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Trang 1Material
Covered
Construction,
Rubber
Tube
Cotton
Rein-forcement
FOR WRAPPED COLD WATER HOSE Serial Designation: D 177 - 24 These specifications are issued under the fixed designation D 177; the final number indicates the year of original adoption as standard or, in the case of revision, the year of last revision
IsSUED AS TENTATIVE, 1923; ADOPTED, 1924
1 These specifications cover hose for use in conveying cold water for other than public or private fire department use
I MANUFACTURE
2 The hose shall consist of:
(a) An inner rubber tube;
(b) Reinforcement of plies of cotton duck;
(c) An outer rubber cover
3 The rubber tube shall be smooth, uniform m quality and thickness and free from injurious defects
4 (a) The reinforcement shall consist of plies of cotton cluck cut on a bias of approximately 45 deg., and applied evenly and firmly over the tube with not less than a !-in lap, not sewed The number
of plies shall be as follows:
INSIDE DIAMETER
OF HosE, IN
NUMBER
OF PLIES
!, ! 3
I, I!, I!, 2, 2t 4
2! to 4 5
The plies of duck shall be well frictioned on both sides with a rubber compound which shall firmly join the plies to the rubber tube and cover and to each other
(b) The duck shall be evenly woven from high grade cotton and shall be free from mechanical defects
(c) The reinforcement shall be sufficiently strong to enable the hose to successfully withstand the hydrostatic pressure test and yet
at the same time be soft and pliable
(1094)
Trang 2SERIAL DESIGNATION: D 177 - 24 1095
5 The rubber cover shall be uniform in quality and thickness, Rubber
II PHYSICAL PROPERTIES AND TESTS
6 The tests necessary to determine the physical properties pre- Standard
scribed in the following sections shall be made in accordance with Methods
the Standard Methods of Testing Rubber Products (Serial
Designa-tion: D 15) of the American Society for Testing Materials
7 A sample 36 in in length shall be cut from each lot of 500 ft Test
8 (a) In the case of hose 1 ih or less in diameter, the test specimens Tests of
shall be cut Ior:gi tt~dinally from the san;ple of the hose; in the case of ~:~:/nd hose over 1m m dmmeter, the test speCimens shall be cut transversely
(b) The tensile strength shall be not less than 600 lb per sq in
for the tube and 450 lb per sq in for the cover
(c) The elongation at the breaking load shall be such that the
original 2-in gage length of the test specimens shall stretch to not less
than 8 in in the case of the tube and 6 in in the case of the cover
(d) The set or permanent elongati<;m following a stretch from 2 in
to 6 in in the case of the tube and from 2 in to 4 in in the case of the
cover shall not exceed 25 per cent
9 The adhesion between plies shall be such that a weight of Friction
15 lb will not cause separation at a rate greater than 1 in per minute Test
The adhesion between the cover and the plies, and also between the
tube and the plies shall be such that a weight of 12 lb will not cause
separation at a rate greater than 1 in per minute
10 The remainder of the 36-in sample after all other test sped- Hydrostatic
mens have been cut therefrom shall withstand a hydrostatic pressure PTrestsure
es • test as follows:
INSIDE DIAMETER
oF HosE, lN
TEST PRESSURE,
LB PER SQ IN
!, i 0 0 • • • • • • • • • • 0 •• • • • • • • • • • • • • • • • • 450
1, 1~, H 350
2, 2t, 2} 300
3, 3! and 4 250
III STANDARD SIZES AND DIMENSIONS
11 Unless otherwise specified, the hose shall be furnished in SO-ft Length
lengths The ends of each length shall be uncapped and without
.:fittings
12 The minimum thickness for the tube of all sizes of hose shall Thickness
b e 0.062 m · Th e mm1mum t 1c ness or t e cover or ' · h' k f h f 2 1 an ;r-m d 3 • of Tube and Cover,
Trang 3Inside
Diameter
hose shall be 0.031 in and for all other sizes of hose, the minimum thickness for the cover shall be·o.047 in
13 The inside diameter shall not vary more than ±: 6\ in from that specified for ~ and i-in hose, nor more than ±:a\ in from that specified for all other sizes
IV MARKING
Marking · 14 Each length of hose 25ft or over in length shall have a brand
inlaid in the rubber cover in three places: namely, approximately in the center and approximately 5 ft from each end Each length of less than 25ft shall have a brand inlaid approximately in the center The brand shall show the name of the m2vnufacturer, the kind and· size of hose, the month and year of manufacture, the trade name of the hose, and the legend "Wrapped Cold Water, lb., A.S.T.M Specifi-cations." The letters and figures shall be l in high, a\ in in relief and shall be clear and distinct
V INSPECTION AND REJECTION
Inspection 15 (a) The manufacturer- shall notify the purchaser sufficiently
in advance of the completion of the hose to permit of arrangement for inspection
(b) The manufacturer shall afford the inspector representing the purchaser, without charge, all reasonable facilities to satisfy him that the hose is being furnished in accordance with these specifications All tests and inspection shall be made at the place of manufacture prior to shipment, unless otherwise specified, and shall be so conducted
as not to interfere unnecessarily with the operatimi of the works (c) The purchaser may make the tests to govern the acceptance
or rejection of the hose in his own laboratory or elsewhere But such tests shall be made within 60 clays after elate of shipment and at the expense of the purchaser
Rejection 16 (a) Any length which fails to meet any of the requirements
of these specifications shall be rejected
(b) In the case of failure to pass any one of the tests specified· Sections 8, 9 and 10, the entire lot of hose represented by the sampl ,
or samples, subjected to these tests shall be rejected
Rehearing, 17 Samples of rejected hose shall be preserved for two weeks
from the date of the test report In case of dissatisfaction with the results of the test, the manufacturer may make claim for a rehearing within that time