1、FORD LABORATORY TEST METHOD BP 118-01 Date 2001 O924 1990 O1 04 MOISTURE INGRESS TEST FOR AIR CONDITIONING REFRIGERANT HOSES Action Revisions Revised Editorial - no technical change A. Cockman Application This procedure is used to measure the amount of moisture that permeates the hose samples when t
2、hey are subjected to a humid environment with vacuum being drawn on the I.D. of the hose samples. Apparatus Required Humidity Cabinet Thermotron or equivalent, maintained at 50 +/- 2 OC and 85 +/- 5 % relative humidity Oven Blue M, or equivalent, maintained at 100 +/- 2 OC Balan ce r Mettler, or equ
3、ivalent, balance capacity of 160 g with an accuracy of +/-0.0001 g Desiccator With a capacity for one set of cold traps Vacuum Pump With a capacity of 95 kPa VacuumlCold Trap System Materials Required Distilled Water Dry Nitrogen Gas Laboratory grade Cold Bath Maintained at -70 OC or lower Copynght0
4、2001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BP 118-01 Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 OC and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested
5、under the same conditions unless otherwise specified. Procedure Throughout this test procedure, there are references to corresponding numbers shown in the Schematic Diagram of Test System identified as Figure 1. 1. 2. 3. 4. 5. 6. 7. Install the test assemblies in the humidity cabinet by plugging one
6、 end-fitting and attaching the other end to the vacuum lines located in the cabinet. Arrange the test assemblies to maximize surface exposure to test chamber ambient conditions without bending the sample in an arc of a radius smaller than 254 mm. Seal the humidity cabinet and set the controls to mai
7、ntain a dry bulb temperature of 50 +/- 2 OC and 85 +/- 5 % relative humidity. Thoroughly clean all vacuum traps, inside and out. Then place the traps in an oven set at 100 +/- 2 OC until thoroughly dry. Remove the traps from the oven, transfer to drying desiccator and allow them to cool to room temp
8、erature. Weigh each trap to the nearest 0.5 mg. Install the traps in the test system (Item 5, Figure I), in the cold bath maintained at -70 +/- 2 OC or lower throughout the test. After all connections are made, turn on the vacuum pump and open Valve No. 2 and then Valves No. 11 and 12. Valve No. 9 s
9、hould be closed. a. A quick leak check can be done by closing Valve No. 12 for about 15 seconds and noting any vacuum decay on Gage No. 6. If there is any vacuum loss, the leak should be located, sealed and the system rechecked. b. Open Valve No. 12. C. Evacuate the system to a vacuum of 95 kPa or g
10、reater and run for one (1) hour. Then close Valve No. 12 for 30 minutes. If there is any detectable loss of vacuum, the test is to be discontinued. The leak is to be sealed and this section 5 is to be repeated. After one conditioning period (24 hours minimum), or 48+ hours, representing one calculat
11、ion period, remove trap) and replace with properly prepared traps per the procedure described in Step 8. Page 2 of 4 Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BP 118-01 8. Sequence of Removing Traps and Weighing Condensate. a. Record time, humidity temperature. b. Clos
12、e Valve No. 2. C. Close Valve No. 12. d. Slowly open Valve No. 9. This sequence is necessary to insure the traps are charged with dry nitrogen at atmospheric pressure. e. Close Valves No. 9 and 11 f. Remove traps one at a time and immediately plug the ends and install another set of traps in the sys
13、tem. 9. Allow the traps to return to room temperature in a desiccator h. Thoroughly dry the trap exteriors with a lint free towel, remove plugs and weigh immediately. I. Record weight and change in weight. 9. Repeat Sections 7 and 8 (conditioning periods) until steady state conditions are achieved.
14、Steady state is reached when the range of three (3) consecutive change-in-weight readings is no greater than seven (7) percent of the smallest reading. IO. Repeat Sections 7 and 8 for a minimum of three calculation periods of not less than 48 hours each. 11. Calculate the moisture ingression rate (M
15、I.R.) of each hose assembly for each calculation period in grams per square meter of internal surface area as follows: Let C = condensate weight in grams T = test hours D = internal hose diameter in millimetres L = length of exposed hose in millimetres M.I.R. (g/sq.m./yr) = 2.78 x IO9 x C TxDxL 12.
16、 Calculate the average moisture ingression for each assembly. Test data shall include all conditioning period condensate weights, calculation period weights, individual and average moisture ingression rates and any comments on occurrences that may have affected the results. Chemicals, materials, par
17、ts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. Page 3 of 4 Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BP 118-01 MOISTURE INGRESS TEST FOR AIR CONDITION
18、ING REFRIGERANT HOSES LEGEND Item Description 1. Humidity Chamber 2. Stainless Steel Valve 3. Copper of Stainless Tubing 4. Cold Bath 5. Glass Vacuum Traps 6. Vacuum Gauges 7. Vacuum Hose 8. Vacuum Manifold 9. Stainless Steel Valve IO. Dry Nitrogen Gas 11. Stainless Steel Valve 12. Vacuum Valve 13. Vacuum Pump Figure 1. Schematic diagram of test system Page 4 of 4 Copynght02001, Ford Global Technologies, Inc
