Document 9JGvza3X18dxxaLRKrBeG2GQe

MiirjTij of the TECHNICAL & RESEARCH COMMITTEE MEETING NATIONAL LNSULATICN MANUFACTURERS ASSOCIATION New fork, N. Y. September 14, 1967 MOILED SECTION The meetlog was called to order at 9:00 A.M. with the following in attendance: H.P. Hoopes, Chairman T.S. Bassett A. Kevlin J. McAllister A. Pocius W.C. Schwingen B.H. Tower Fibreboard Johns-Manville Owens Corning Baldvin-Ehret-Hill Johns-Manville Ruberoid Johns-Manville 1. Proposed combined Mil Specs MIL-I-2781 and KIL-I-2819 were discussed per J. M. Barnhart's letter of July 27, 1967 to Robert G. Hall, H.S.E.C a. A change in temperature classes is recommended as shovu afollows Class 1 - Temperatures up to 600 7 Class 2 - Temperatures up to 1200 7 Type a Type b Class 3 - Temperatures up to 1500 7 Class 4 - Temperatures up to 1800 7 b. J. M. Barnhart's letter of July 27, 1967 regarding MIL-I-261? was agreed on. 2. The ASTM Specification for Stress Corrosion of Austenitic Stainless Stc was discussed. It was agreed that there is too much variation in test methods to combine them into one reccaaended procedure. 3. KIL-I-24244 - The group discussed the details and philosophy of this specification. a. Performance test versus chemical analysis, e.g. for chlorides. b. Cc-rtn'icstion of compliance and sampling procedure which members mny interpret differently, l.e. test for each order and each lot or test once end continue to certify ss long as there is it" change in formula or production method. -2 - c. Recorar.end.ition to Board of Directors that NIIOA authorize a 5/--; from the Molded Section to approach the appropriate Gover.---i.. Agency or Agencies requesting clarification of ambiguities ir. MIL-I-242U. d. The members also suggest that J. M. Barnhart contact other in* duotry aor.ociations concerning their present or expected diffi culties with comparable specs, dealing with stress corrosion of austenitic stainless steel, for other materials. 4. HH-I-523C a. Regarding paragraph 3*4.4. The members recommend a change to "... aluminum foil shall not be less than 0.001 inch thick. . b. Regarding paragraph 3-4.4.1 and paragraph 3*4.5.1, the committee section recommends that both be changed to delete ". . .of the paper surface. . ."as regards flame spread not to exceed 25. 5. The committee discussed the Westingbouse specification pertaining to nuclear reactors and primary containment area. It was agreed that since this is for "canned" material, it does not pertain*to molded insulations. 6. I.O.C.N.A. The group discussed briefly the compilation to be presented to the full committee on September 15, 1967. Respectfully submitted, T.S. Bassett MINUTES of the TECHNICAL k RESEARCH COMMITTEE MEETING NATIONAL niSUIATION MANUFACTURERS ASSOCIATION New York, N.Y. September 14, 1967 MINERAL FIBER SECTION The meet Lag was called to order at 9 '*00 A.M. with the following in attendance: T.C. Campbell, Chairman R. P. Austin J. B. Dorsey C.E. Ernst W. Gubar S. K. Heard W.T. Irwin L. Lach K. M. Ritchie Owens-Corning Certain-Teed Johns-Manvllle Johns-Kanville Certain-Teed Owens-Corning PPG Industries Johns-ManvUle Baldwin-Ehret -Hill FEDERAL SPECIFICATION HB-I-558A As a result of the meetings held in Washington, D. C. on July 20 between the Government T & R Committee, the Corps of Engineers snd GSA, this speci fication, which was issued March 7, 1967, was reviewed. The Government had stated they felt that the tezmnology "semi rigid" was ambiguous and sug gested that it should be dropped from the specification. After discussion, it was decided that N24A would reconsnend that when HH-I-558 is next re vised, the definition of Fora A in paragraph 1.2.1 be changed to read "Form A - blocks end boards, rigid" dropping the words "and seci rigid". Table I - "Sizes" Should be amended in the thickness column for Form D (pipe insulation! to edd the word "nominal1*". Note 4 shall read "See paragraph 3.5.1.1". Paragraph 3,5.1.1 should be aatea&ed to read "........... Thicknesses available for various pipe and tube sizes are nominal. Actual thicknesses will vary In accordance with manufecturera' standard sizes. Greater thicknesses are available by combining two or more layers of in sulation............". Table III "Thermal Conductivity" - (of flexible blankets) - K factor data for textile fiber Insulation should be changed as follows: MEAN TEMPERATURE B-1 B-2 25 .30 .29 50 .32 .31 75 .3* .33 100 .37 .33 200 .53 .50 - 2- Table IV - "Flexible Blankets to U^pOy1' . Under the heading Class 1, change description to reed "up to 4 pcf". Delete the coluaa "above 4j pcf". This change is recocnended as there are no flexible blankets commercially avail able at densities greater than pcf. Paragraph 6.2 (J) - Delete reference to Form D, type IV so that this para graph would then apply to Fora C, Metal Mesh Blankets. This change is reconsended as blanket type pipe insulation is not available with metal on betr. sizes and is generally available in one type of aetal facing only so that a reference to blanket type pipe insulation (Fora D, Type IV) in this paragraph under ordering data is confusing. FEDERAL SPECIFICATION HH-I-00545 (MDtSRAL FIBER. DUCT ISSR MATERIAL) The Coaoittee reviewed a rewrite of this specification dated 9/1/67 pre pared by Charlie Ernst which incorporated all of the changes and suggestions of the April 6 meeting. Most of the changes were editorial and are as fol lows: Paragraph 1.1 - Third line change word "and" to "to" so that the Scope reads "This specification covers mineral fiber insulation........... to provide sound attenuation in systems......... ". Paragraph 1.2.3 - Under Type I - Flexible - change sequence of Widths to reverse their order starting with the smallest. Paragraph 2.2 - Other Publications - Change the reference for Fire Hazard classification to ASTM E-3**. Paragraph 3.8 - Meld Growth and Humidity - Add a new sentence "The sold shall not be spread beyond the inoculated area and no significant grovtn snail be observed." In reference to test methods at end of paragraph, add "and 4.4.7". Paragraph 3.9 - "Teigperature Resistance" - Change reference to test me chocs from 4.4.7 to 4.4.3. Delete words et end of paragraph "in specified tests". Paragraph 3.14 - "Thermal Conductance" - After the headings, Type I and Type II in Table 1 - Maximum Thermal Conductance (C), insert an asterisk which will refer to the following note: 'The Conductance (C) for thicknesses over 1" is inversely proportional to the conductance of 1" material." In the table under the heeding Type II, delete the conductivity heading and conductances listed for 1/2" material. Paragraph 4.4.7 - "Temperature Resistance" - Change to reed "three 8" x 8" x 1" samples......... Paragrooh - "Erosion" Change to read "The 1" thick insulation -3- Negative ballots received as result of a circulated draft of ttis specifica tion were reviewed with the following changes being proposed. Paragraph 1.1 - "Scone" - In third line, remove "up to 1000F (53SC)". Temperature limit need not be included in the Scope as it is spelled out cr. Paragraph 2, the classification for each of the three types. Paragraph 2.1 - Change the description of the three types to read as follows Type I Resilient Flexible - for use to 350F (177F) Type II Flexible - for use to 450F (232C) Type III Flexible - for use to 1000F (538C) This revision would delete the words "below ambient and above ambient" for Types I and U and the words "above ambient" for Type XU. It was felt that the deletions were unimportant as Paragraph 1.1 (Scope) states that the product may be used on heated surfaces or cold surfaces below ambient temper* ature. It was further felt that Type III Insulation, while normally used for hot equipment, could be satisfactorily used qd equipment operating below ambient temperature and that the specification should not restrict this possible usage. Paragraph 3.2 - "Construction" - Change the word "inorganic" to "mineral" so tnat tne paragraph reads "Bie insulation covered by this specification shall be composed of mineral fibers with or without added binder...". Paragraph 5.1 - "Hiysical Requirements" - In Table 1 of Themml Conduct ivities, the heeding for Type II material should read "up to pcf". There should be no column for insulation heavier than pcf, as none axe available. Under Type III Insulation, delete reference to density. Add the follow!." K factors: Mean Temperature K Factor UOOF 500F .76 1.20 Paragraph 8.2 - "Flexibility" - Change the reference to "the sample as re ceived" to read "a 12" x 121, x 1" pieca of insulation...". It is felt that all testing to determine whether e product is flexible or rigid, etc., should be conducted on a 1" thick sample so as to properly cate gorize the material. Cartaln insulation materials which are "flexible" in a 1" thickness might be classified as "rigid or easi-rigid" if tested in thick nesses of 3" or 4". This could cause greet ccofuaioa with the specifying and purchasing factors and would also serve to improperly class ify the product with regard to thermal conductivity end other physical properties of "flexible or "rigid" materials. This Committee will undertake to follow this recommendation in all future specifications which it considers. General - There is no specification referenced in Section 8, "Methods of test for determining maximum temperature limits. It is felt that ASTM should quickly develop a suitable specification for mineral wool insulations wnich could be used In determination of "minimum upper service tesseralure limit". At present, there is disagreement among members of NIMA as to proper test method. ASTM SPECIFICATION C378 & C392 (COMBINED) This proposed specification was not reviewed in detail as results of letter ballot have not yet been received from ASTM Cosnittee members. It ves agreed, however, that when this specification is reviewed, considera tion will be given to elimination of the words "below ambient and above ambient" im each of the five classes. This would be consistent with the previous comments regarding ASTM C553 FHlERAL SPECIFICATION HH-B-10QA f Jack Barnhart distributed copies of this specification for "vapor barrier ma terials and pipe and duct insulations" and asked that the members of the Com mittee review it and send their consents to him by Septesfeer 30. He will con solidate these comments and pass them on to GSA, who is working on tills speci fication. General A. Jack Barnhart distributed copies of letters sent by SIMA to the Naval Ship Engineering Center, Washington, 0. C. during the past several months consenting on proposed revisions to the following specifications: MIL-I-22023 MIL-I-742 MO-I-I5475 MIL-1-2818 "Insulation felt, Thermal asd Sound Absorbing Felt, Fibrous Glass, Flexible" "Insulation Board, Fibrous Glass" "Xnsulstlon Felt, Thermal, Fibrous Glass, Semi Rigid" "Insulation Blanket, Thermal, Fibrous Mineral" B. The subject of fire hazard classifications ves discussed. It was again stated that NIMA should encourage the establishment of classification categories such es Class A, Class B, etc., wherein Class A materials would have Maximum Flame Spread of 25 end Maximum Smoke Developed of 50 with the other classifications having highar ratings. Charlie Ernst agreed to suomarlze the information contained in the AMA Catalog and in Federal Specification SS-B-U6. If agreeable to the Coamuttec, these cl assJflcations would be proposed to Underwriters Laboratory so that. hopcfviUy, a standard series of classifications could be used in all 3pecific-itions by all agencies. -5- C. The subject of standardization of K factor information on flexible in sulations was discussed. It was the consensus of the Committee that this had been accompli shed in the recently issued Federal Specification HH-I-55S to be used as a guide in future work on other specifications involving similar materials. D. It was suggested by Walter Gubar that, in the future, each Committee member should send copies of all corre- pondence regarding Committee projects to all members rather than merely directing their comments to jacJc Barnhart. This would enable all nembers to understand the thoughts and feelings of the various member companies, and should lead to more productive Committee meetings. It was agreed that this recommendation would be adopted. Respectfully submitted, Thomas C. Campbell