Page 312 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

(v) Hold the test pressure for a period of 5 minutes whilst
examining the hose assembly for leaks at the nipples or for
test as follows:ึกษาเท่านั้น---
any signs of distortion or twisting.
(vi) At the end of the 5 minute period and while the hose is still
under full pressure, re-measure the length of the hose
the used hose assembly is under test pressure, but the hoseชย์นาวี
assembly. Ascertain the temporary elongation and record
the increase as a percentage of the original length.
(vii)
Pressure and hold this pressure for 5 minutes.

Examine the hose assembly and check for leaks and any
(viii) Slowly raise the pressure to 1.5 times the Rated Working
sign of distortion or twisting. Conduct an electrical
continuity test with the hose at test pressure.
Reduce the pressure to zero and drain the hose assembly.
(ix)
Re-test for electrical continuity.
งานห้องสมุด ศูนย์ฝกพาณิ
If there are no signs of leakage or movement of the fitting while

exhibits significant distortion or excessive elongation, the hose
assembly should be scrapped and not returned to service.
---ใช้เพื่อการศ
If the integrity of the hose lining of smooth bore rubber hoses is
in doubt, the hose should be additionally subjected to a vacuum
ึ
(i) Remove the blanks used for the pressure test and fit
suitable plexiglas plates to the hose ends.
(ii) Apply a vacuum of at least 510 mb gauge for a period of
10 minutes.

(iii) Inspect the interior of the hose for blisters, bulges or
separation of the lining from the carcass. Any damage to
the lining should result in the hose being retired from
service.
(iv) Release the vacuum.

(v) Re-test for electrical continuity or discontinuity as
appropriate.

It should be noted that lightweight hoses, composite hoses and
rough bore hoses should not be subjected to a vacuum test.

18.2.6.4 Electrical Continuity and Discontinuity Test

When using flexible hose strings, one length only of hose without
internal bonding (electrically discontinuous) may be included in
the hose string as an alternative to using the insulating flange
(see Section 17.5.2). All other hoses in the hose string should be
electrically bonded (electrically continuous). Since electrical
continuity can be affected by any of the physical hose tests, a
check on electrical resistance should be carried out prior to,
during and after the pressure tests.

Electrically discontinuous hose should have a resistance of not
less than 25,000 ohms measured between nipples (end flange to
end flange). The testing of electrically discontinuous hoses should
be carried out using a 500 V tester.

278 © ICS/OCIMF/IAPH 2006