Iranian Classification Society Rules
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(3) Test items, test method and criteria
The requirements in Table 3.17.2 are, in principle, to be considered as the criteria for the type
tests of flexible hose assembly of metallic materials. A test method other than those given in the following table may be employed by this Society if deemed appropriate of its equivalency.
Table 3.17.2 Testing methods and Criteria of flexible hose assembly of metallic materials
Test Item | Test Method | Criteria |
Measurement of Dimension | ||
Diameter | Measure dimensions using vernier calipers, plug gauge, taper gauge or inside calipers etc. | The diameter is to be with- in allowable tolerance. |
Performance Test | ||
Impulse Test | ① Test pressure : A pressure 1.5 times of the design pressure. ② Test medium : water. ③ Test cycle : 0.5 Hz ~ 1.7 Hz, 150,000 times. This test is to be applied on the piping systems where pressure pulses are expected to occur in service. | During test period, no rup- turing, leaking are permitted. |
Bending Fatigue Test | (1) U bend test ① Bend radius : see ISO 10380 Table 2. ② Test pressure : design pressure. ③ Test medium : water. ④ Test cycle : 5 cycles/min. to 30 cycles/min. for 5 min.
| A localized reduction of the hose radius is not to be more than 50 % during the test. During test period, no rup- turing, leaking are permitted. |
Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015 113
Table 3.17.2 Testing methods and Criteria of flexible hose assembly of metallic materials
Test Item | Test Method | Criteria |
Bending Fatigue Test | (2) Cantilever bend test ① Stroke : see ISO 10380 Table 4. ② Test pressure : design pressure. ③ Test medium : water. ④ Test cycle : 3 cycles/min. to 15 cycles/min. for 5 min.
| A localized reduction of the hose radius is not to be more than 50 % dur- ing the test. During test period, no rupturing, leaking are permitted. |
Bend Test | ① Bend radius : see ISO 10380 Table 2. ② Test pressure : without pressure in hose. ③ Test medium : water. ④ Test cycle : 5 cycles/min. to 25 cycles/min. for 5 min.
⑤ Following the bend test, a pressure test is to be carried out at a pressure 1.5 times of the design pressure for 2 minutes. | During test period, no rupturing, leaking are permitted. |
Burst Test | ① Test pressure : a pressure 4 times of the design pressure. ② Test duration : 5 minutes. |
1704. Markings
Type approved flexible metal hose assemblies are to be permanently marked by the manufacturer with the following details
(1) Hose manufacturer’s name or trademark.
(2) Date of manufacture (month/year).
(3) Designation type reference.
(4) Nominal diameter, Pressure rating, Temperature rating.
114 Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015
1705. Product Inspection after type approval
Flexible hose assembly of metallic or non-metallic materials used for Class I and II pipe fittings is subjected to a hydrostatic test at a pressure 1.5 times of the design pressure.
Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015 115
