Document 6R4a4X4Jqw7ykzxKgo5JavG94

July 16, 1952 C. B. Barnett 7* C* Baton (?o Be noted by:) j R. S. Gardner ' G* D* Poole J. D. Lowry tf. E. Boyd Tack Force Report Ho* 25 Evaluation of aShorter Air Care After a One Hour Holst Heat Care. Task Force Report Ho* 26 Special Fiber Run 25$ M-383-I (30$ Australian Blue, 70$ 4Z20) 6-in. 150 Pipe Attached hereto are copies of the above Task Farce Reports* As & result of the work based on Task Force Report Ho* 25, plans hare been made for the installation of the equipment to Care Pipe 1' hoar in Hoist Heat, which will replace the four hour dwell period* This method will reduce the amount of storago space and the somber of mandrels* that would have been necessary to take advantage of the four hoar dwell time* This report also indicated that aftor Pipe 'has been cured in Hoist Heat for one hour that Air Curing of two hours after stripping sdfdrt replace the presort 18 hour Air Core. Task Force Report Ho. 26 covers the work on the use of 30$ Australian Blue with 70$* 4Z20. Additional work Is being carried on to deteissins the relative effects of 42428, 4-Z20, and 63) fibres in a blond of 30$ of African Blue* SC: cm cc; E* R* tfllliama-Research G. 3.. Brown-Research A. 3)elRoeco-Hanville R. H Heisel-Researoh *fi. Jacobe-Hanvllle H. J. 0,3x*ion-Kanvilie J* R. Robson-Hanville A. J. Schilling-Kanvill* J. Q*. Trice-Research S* COLLIER K* J1 Tfoaleh-Kasville D* Howlin-Research P. B. Proctor R. Hebei .3* C* Lindstrom V. L. Yan&orbeek G. Smolafc-Research H. E. Rlchards-Hanvillt P. B. Cannon / Research Center July 22* 1952 Files 425-37a-l S. Collier - GtfH* (16 P. D. Cannon - GH H,, S Richards * Manville G, Smolak Transits Pipe Process Study Special Fiber Run 25% H-383-1 (30% Australian Blue* 70% 4Z20) 6-i. 150 Pipe Task Force Report Ho, 26 As part of the Task Force investigation of the use of Australian Blue fiber in the manufacture of Translte pipe* a preliminary plant run vas made with blend M-383-lr 30 per cent Australian Blue and 70 per cent 4220. The preliminary plant run shows the special blend to be an operable blend but requires a slightly longer forming time to produce pipe with the same forming characteristics and ultimate strength level as is obtained with the standard bland M-60-l Detailed results are is the attached report. fa oct G 3*. Broun la&lsESS*' P, B, Rroctor - G.fl, R, Rebel - G.H. . A, R, Girardi - G0B (4) H, J0 OsBrien - Manville A Ho Schilling - Manville A0 Del Rocco - Manville Jo Qo Trice K, J, Whalen The Task Force by* Do Nowlin "Report No. TF-26 July 22, 1952 Transits Pipe Process Study Special Fiber Run 25% M-383-1 (30% Australian Rlue? 70% 4Z2G) 6R--150- Pipe Task Force Report No, 26 SUMMARY? The use of 25 per cent of special blend M-383-1 (30 per cent Australian Blue, 70 per cent 4220} compared to the use of 25 per cent of standard blend M-360-1 in 6-in. 150 pipe. a. Results in an operable blend but has a tendency toward fiber clots in the sheet and requires a slightly longer forming time to produce pipe with the usually accepted forming characteristics. b. Results in pipe with comparable ultimatestrength levels and a tendency for the average ultimate hydro strength to be significantly higher than whan using the standard blend. PURPOSE AND SCOPS* whether Australian Blue fiber could be- substituted' for MS Blue in the manu facture of Transit pipe. A previous plant run'in which Australian Blue was substituted for MS Blue in the standard M-360-1 blend did not show any significance difference between-the taro-Blue fibersv- (See Task Force Report No. 19 dated May 26$ 2952.) The Blue content of blend M-360-1 is cniy 9.5 per cent? and? therefore? the relatively small amount"-of Blue fiber in the pipe might have been insufficient to show any appreciable, difference which might exist between Australian and MS Bide. A Task" Force "decision was reached to run an eight hour shift* of 6-in. 150 pipe.using a* fiber blend which contained a relatively high percentage of Australian Blue-fiber. .The special fiber blend contained the foHowing_virgin fibers i Australian Blue 4220 30% 70% This blend? designated as M-3S3? was given the standard willoving procedure? that is? willowed anceo with 10 per cent scrap addition and was used as a 25 per cent mix on the Manvilla No. 2 machine? in 6~in. 150 pipe? on May 27, 1952. The 6-in. 150 pip6 manufactured with 25 per cent standard blend M-360=l '-- f: . \ " - Report Ho* TF-26 Page 2 PROCEDURES (Coat'd) before and after the special blend were followed for comparison purposes* Hydro . and flexure test pipe were designated at the time of manufacture* Samples of the diy stock feed to the machine were taken from the "before* run of 25 per cent M-360=l and from the a pedal run of 25 per cent M-383-1 and used in making sag cakes* Production and inspection results were analyzed for inspection losses at each point of inspection and total net recovery* Production end inspection results and ultimate strength levels in hydro9 flexure and crush are shown in the following tables* Table I Summary of Inspection Results Special Fiber Run--25* H-383-1 6*--150 ^Before* Ran 25* H-360-1. Ho* of Sections Hanufaotured Scrap at Pipe Kachlne Rejects at Pipe Kachlne Ho* of Sections Machined and Inspected Inspection Rejects Flexure Failures Hydro Failures Hat Recovery Based on Ho* of Sections Hanufaotured %. . ? V* Aua'T *-- * 86 0 0 86 1 - 1.256 0 2 - 2.3* 52 - 96.556 86 Het Recovery Based on Ho* of Sections Machined and Inspected * & - 96*5* 86 Average Forming Times *= 'Minutes 1.16 Special Run 25a.fo282.-l After* Run 25* H-360-1 * 319 0 3 - 0.9* 316 4 1*3* 0 6 - 1.9* 83 0 0 83 0 0 0 20$ - 95.9* 319 52 loo.o* 83 226 96.8* 316 52 - 100.0* 83 1*26 1*13 Report No* TF-26 Page 3 KBSULTSa (Cbnt!d) Table II Suaaiary of Ultimate Strengths Special Fiber Blend--25* H-3S3-1 6*--150 Pipe No* of Hydro Teat Pipe Average Load? pai Standard Deviation' Average MR? Ib/aq in* Standard Deviation No* of Flexure Teat Pipe Average Load? lbs Average MR? lbs/sq In* No* of Crush Samples Average Load? lbs Standard Deviation Average MR? lb/sq in. Standard Deviation Before" Run ERft-1 17 864 89 5079 534 3 4220 4607 34 8810 646 8365 844 ' Special Run 25* K-383-1 32 924 65 5423 397 6 3860 4318 62 9414 1039 8972 978 After" Run 3S* 16 827 78 5099 546 3 41604617? 34 8095 837 8129 875 Results of sag oaks testa on the dry stock feed are shown in the foilowing table. Table HI Senary of Sag Cake Teats Cakes Hade with Dry Stock Feed to Machine -iV V!- Standard Blend 25* M-360-1 Special Blend 25* K-383-1 * No* of Sag Cakes Average Modulus of Rupture pai Standard Deviation 21 4067 179 21 4322 167 Average Filter Time--sec* Standard Deviation 73 2*9 97 5*5 - Report Bo. TF-26 Page 4 RBmTSt -- fContMl As the special blend started through the machine 9 the following changes were noted? 1 Slightly Increased end stretch of the pipe? 2. Formation of fiber dots In the sheet? 3^ Large and heavy slug formed on the mold during mandrel change. Proa past operating experience? the above forming characteristics are generally avoided or minimized. By lengthening the forming time on the pipe made with the special blend? by about 0.10 minutes? the end stretch v&s approximately te same as with standard blend M-360-1 and the fiber clots and slug assumed reasonable proportions. The tendency for fiber clots .to fora? particularly at the ends of the pipe vaa definitely more pronounced with the special blend than with standard blend M-360-1. Other than the longer forming times? no changes were made in the machine operation and by forming pipe in 1.25 olnutps the special blend ran approximately comparable to the standard blend vhen forming pipe in 1.15 minutes. The .longer forming times for the special blend was verified by the sag cake tests which shoved the filter time of the special blend to average 97 second^? while the cakes made with standard blend filtered in 73 seconds average. As shown in Table H the ultimate strength levels in hydro? flexure and crush for 6-in. 150 pipe made with the special M-383-1 blend In a forming f/.-rr* of about 1.25 minutes? were In the same range as the strength levels for pipe made with standard blend M-360-1 in 1.15 minutes. The hydrostatic strength with the 14-383 blend was higher than with the M-360 blend? but for the number of samples taken? the unit hydro strengths -were not significantly different. DISCUS SIQHa One of the characteristics of a fiber blend containing a high percentage of Blue fiber is the tendency for the pipe manufactured to be difficult to strip from the. oores*Stripping trouble vas encountered on the last speolal run with a ble^pootaining 30 per oent Blue fiber? therefore? to avoid a repetition of the expedited difficulty with blend M-383-1? as the blend vas introduced to the maohln*f^$he;.speed of the stock feed screw vas increased and air lancing' vas usedi'S'Mo^ stripping trouble vas encountered but the end stretch increased? fiber, slots appeared in the sheet and a heavy slug vas formed on the mold dicing the $aodrel change. The stock feed screv vas slowed and to minimize the adverse effeots and approach the operating conditions prevailing with the use of the standard M-360-1 blend? it was necessary to form pipe a little slower with the special blend than with the standard M-360-1. Although the ultimate strength level in hydro averaged higher with the M-383-1 blend? the average hydro unit strength for the. special blend was not significantly different than the average hydro unit strength with the M-360=l blend. A significant difference may exist? but the number of hydro test pipe taken was not sufficient, to establish a difference statistically. *\ Report Ho. 77-26 Page 5 CONCLPSIOKSg The use of 25 per cent blend M-383-1 in the manufacture of 6-in. 150 pipe results in an operable blend? but requires a slightly longer forming time to produce pipe with the same forming characteristics as when using 25 per cent of standard blend H360>1. The ultimate strength levels "of pipe made with the special blend were not significantly different than the strength levels of pipe made with thd standard blend0 An extended plant run would be necessary for verification of the results. > S' * J ..vfrii/'- J> ,r.. /