Page 310 - GoodyearEPIndustrialHose

APPENDIX C
Air &
Multipurpose
General Purpose
Heavy Duty
Push-on
Chemical
Transfer
Cleaning
Equipment
Food
Transfer
Washdown
Marine
Material
Handling
Abrasives
Bulk Transfer
Cement & Concrete
Mining
Petroleum
Aircraft Fueling
Dispensing
Dock
Transfer
Spray
Steam
Vacuum
Veyance
Water
Discharge
Suction &
Discharge
Washdown
Welding
Coupling
Systems
APPENDIX
308
ELECTRICAL RESISTANCE TESTS
FOR HOSE AND HOSE ASSEMBLIES (continued)
GENERAL INFORMATION
10.0 Procedure for hose with conducting or non-conducting compounds throughout:
Apply the electrodes as specified on the inside surface at one end of the hose (end A) and on the outside surface at the other
end of the hose (end B).
Apply the metal contacts to the electrodes.
Apply the test voltage (9V for conductive compounds and 500V for non-conductive compounds) and measure the resistance
5 seconds ± 1 second after the voltage is applied.
Alternative method for non-conductive hose – Nail or “Pot Room” Method
Conduct test as follows:
1. Cut sample hose, 24 inches long
2. Assure that both inside and outside of hose are free of oil, dirt, etc.
3. Pierce sample ends with clean nails, as shown in Fig. 6-2.
4. Connect nails to 1000-volt DC power source and megohm meter or 1000 volt “megger” as shown in Fig. 6-2.
5. Record total resistance, in megohms.
6. Measure “test length” as shown in Fig. 6-2.
7. Divide total resistance by test length to get megohms per inch.
9 V d.c. insulation tester
Hose test piece, approx.
300
25 100
100
Metallic foil pieces
wrapped around
conducting electrodes
and held by clips
25
Figure 6-1 – Electrodes and contacts for testing hose
Dimensions in Millimeters