GB/T 23448-2019 English PDF (GBT23448-2019)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 23448-2019
Historical versions: GB/T 23448-2019
Preview True-PDF (Reload/Scroll if blank)

GB/T 23448-2019: Sanitary ware -- Flexible hose
GB/T 23448-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140.70
Q 31
Replacing GB/T 23448-2009
Sanitary ware - Flexible hose
卫生洁具 软管
ISSUED ON: AUGUST 30, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Classification and code ... 7 
5 Materials ... 8 
6 Technical requirements ... 8 
7 Test method ... 11 
8 Inspection rules ... 17 
9 Signs and markings ... 19 
10 Packaging, transportation, storage ... 20 
Appendix A (Normative) Limit requirements for the precipitation of harmful
substances in flexible hoses ... 21 
Appendix B (Normative) Test method for precipitation of metals and organic
compounds ... 25 
Sanitary ware - Flexible hose
1 Scope
This standard specifies the terms and definitions, classifications and codes,
materials, technical requirements, test methods, inspection rules, signs,
markings, packaging, transportation, storage of flexible hoses for sanitary ware.
This standard applies to flexible hoses for sanitary ware, whose working
pressure is not more than 1.0 MPa AND water supply temperature is not more
than 90 °C.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 5750.6 Standard examination methods for drinking water - Metal
parameters
GB/T 5750.8 Standard examination methods for drinking water - Organic
parameters
GB/T 6461-2002 Methods for corrosion testing of metallic and other
inorganic coatings on metallic substrates - Rating of test specimens and
manufactured articles subjected to corrosion tests
GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight
joints are not made on the threads
GB/T 7759.1 Rubber, vulcanized or thermoplastic - Determination of
compression set - Part 1: At ambient or elevated temperatures
GB/T 7759.2 Rubber, vulcanized or thermoplastic - Determination of
compression set - Part 2: At low temperatures
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
to the method specified in 7.9.2; the ovality is not more than 15%;
After the metal corrugated flexible link hose for water is tested, according to the
method specified in 7.9.3, it shall meet the requirements of 6.4 and 6.5.
6.10 Resistance to cyclic cold and heat
After the flexible hose for shower, flexible hose for washing, pullout hose for
faucet are tested, according to the method specified in 7.10, there shall be no
rupture or leakage; the tightness shall meet the requirements of 6.4.
6.11 Aging resistance
After the test according to the method specified in 7.11, there shall be no rupture
or leakage, at all parts of the flexible hose; the tightness shall meet the
requirements of 6.4.
Note: For the flexible hose for shower and pullout hose for faucet, this clause does not
apply.
6.12 Surface corrosion resistance
After the coated parts and stainless steel parts are subjected to the 24 h acetic
acid salt spray test (ASS), according to GB/T 10125, it shall not be lower than
the requirements of the appearance rating (RA) 9, in Table 1 of GB/T 6461-2002.
6.13 Limits for the precipitation of harmful substances (applicable to
flexible hose contacted with drinking waters)
6.13.1 Limits for precipitation of metal harmful substances
The statistical value of lead precipitation (Q) shall not be greater than 5 μg/L;
the precipitation of non-lead elements shall not be greater than the limit, which
is specified in Table A.1 in Appendix A.
6.13.2 The precipitation limit of organic compounds
It shall not be greater than the limit, which is specified in Table A.2 and Table
A.3.
7 Test method
7.1 Appearance
Use visual inspection. The visual inspection distance is 500 mm; the illuminance
is not less than 300 lx.
7.2 Dimensions
Use a ruler or steel tape, which has an accuracy of 1 mm, to make
measurement. When measuring, the flexible hose shall be placed in a natural
state; no force shall be used to stretch the hose.
7.3 Threaded connection
7.3.1 The thread accuracy is measured, by a thread gauge of the corresponding
grade.
7.3.2 The thread length is measured, by a caliper or depth gauge, which has an
accuracy of not less than 0.1 mm.
7.3.3 The thread torque is tested by a torque wrench. During the test, put the
hose connection thread (including the sealing rubber gasket), on the
corresponding fixture; gradually apply the torque to the specified torque value.
Perform a torque test on the other end of the flexible hose in the same way.
7.4 Tightness
Connect one end of the flexible hose to the pressurizing device; connect the
other end to a flow regulating valve. The flexible hose for cold water is fed with
room temperature water; the flexible hose for hot water is fed with hot water, at
(70 ± 2) °C. Adjust the dynamic pressure to (0.30 ± 0.02) MPa. Adjust the flow
control valve, so that the water flows through the flexible hose, at a flow rate of
6 L/min, for 5 min. Then adjust the dynamic pressure to (0.50 ± 0.02) MPa; keep
it for (300 ± 10) s.
7.5 Pressure resistance
Connect one end of the hose to the pressurized equipment. Connect the other
end to a plug, which has an exhaust valve. Slowly add room temperature water,
at a temperature not exceeding 30 °C, into the flexible hose. Close the exhaust
valve, after the air in the flexible hose is drained.
Connect flexible hose and flexible hose for washing: Slowly increase the water
supply pressure to (1.40 ± 0.02) MPa, within (60 ± 10) s; keep it for (60 ± 5) min;
then increase the pressure to (3.50 ± 0.02) MPa; keep it for (60 ± 10) s.
Flexible hose for shower and pullout hose for faucet: Slowly increase the water
supply pressure to (0.70 ± 0.02) MPa, within (60 ± 10) s; keep it for (60 ± 5) min;
increase the pressure to (2.00 ± 0.02) MP; keep it for (60 ± 10) s.
7.6 Flow
Install the flexible hose on the test equipment, according to Figure 2. Apply a
± 3) °C water, for 168 h. Immerse the flexible hose for cold water in (60 ± 3) °C
water, for 168 h. Observe whether there are any ruptures, leakages and other
undesirable phenomena in various parts, during the test. After the test, perform
the tightness test, according to 7.4.
7.12 Surface corrosion resistance
Carry out the 24 h acetic acid salt spray test, according to GB/T 10125. The
results are rated, according to GB/T 6461-2002.
7.13 Limits for the precipitation of harmful substances
Test according to the method specified in Appendix B.
8 Inspection rules
8.1 Inspection classification
Product inspection is divided into exit-factory inspection and type inspection.
8.2 Exit-factory inspection
8.2.1 Inspection items
The exit-factory inspection items include 6.1, 6.2, 6.3, 6.4, 6.5, 6.12.
8.2.2 Group-batching rules and sampling scheme
Group batches of products of the same category, same variety, same model.
The samples, which are re...