Document jB8kO195B33rVp67ZEjBgnbe5

MINUTES of the TECHNICAL & RESEARCH COMMITTEE MEETING NATIONAL INSULATION MANUFACTURERS ASSOCIATION New fork, N.Y. September 14, 1967 MINERAL FIBER SECTION The meeting 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. X. Heard W. T. Irwin L. Lach X. M. Ritchie Owens-Coning Certain-Teed johns-Manvllle Johns -Manville Certain-Teed Owens-Corning PPG Industries Johns-Manville Baldwin-Suret-HUl FEDERAL SPECIFICATION BH-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 end GSA, this speci fication, which was issued March 7, 1967, was reviewed. The Government had stated they felt that the terminology "semi rigid" was ambiguous and sug gested that it should he dropped from the specification. After discussicn, it was decided that NXMA would recosnend that whan HH-I-558 is next re vised, the definition of Fora A in paragraph 1.2.1 be changed to read "Form A - blocks and boards, rigid" dropping the words "and seed rigid". Table I - "Sizes" - Should be emended in the thickness column for Form D (pipe insulatiouT to add the word "nominal1*". Note 4 shell read "See paragraph 3.5.1.1". Paragraph 3.5.1.1 should be amended to read "........... Thicknesses available for various pipe and tube sizes are nominal. Actual thicknesses will vary in accordance with manufacturers' standard sizes. Greater thicknesses are available by combining two or more layers of in sulation......", Tsble IH "Thermal Conductivity" - (of flaxible blankets) - K factor data for taxtile fiber insulation should be changed es follows: MEAN TEMPERATURE B-1 B-2 25 .30 .29 50 .32 .31 75 .33 100 .37 .35 200 .53 .50 -2- Table IV - "Flexible Blankets to 450?" . Under the heading Class 1, change description to read "up to 4 pcf". Delete the coluaa "above 4$ pcf". This change is recommended as there are no flexible blankets commercially avail able at densitiea greater than pcf. Paragraph 6.2 fJ) - Delete reference to Fora D, type IV so that this para graph would then apply to Form C, Metal Mesh Blankets. This change is recomanded as blanket type pipe insulation is not available with metal on boon sizes and is generally available in one type of netal facing only so that a reference to blanket type pipe insulation (Form D, Type IV} in this paragraph under ordering data is confusing. FEDERAL SPECIFICATION HH-I-00545 (MINERAL FIBER. DUCT LTGR MATERIAL) The Committee 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 t-o reverse their order starting with the smalleat. Paragraph 2.2 - Other Publications - Change the reference for Fire Hazard classification to ASTM'E-34. Paragraph 3.8 - Meld Growth and Humidity - Add a new sentence "The sold shall not be spread beyond the inoculaced area and no significant grovtn shall be observed." In reference to teat methods at end of paragraph, add "and 4.4.7". Paragraph 3.9 - "Temperature Resistance" - Change reference to test methods from 4.4.7 to 4.4.0. Delete words at 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 read "three S" x 8" x 1" samples......... Paragraph 4.4. ft - "Erosion" - Change to read "The 1" thick insulation........." -3- ASTM Sg-CIFICATIG:; C553 Negative ballots received as result of a circulated draft of this specifics' tion were reviewed with the following change* being proposed. Paragraph 1.1 - "Scope" - In third line, remove "up to 1000F (53SC)". Temperature licit need not be included in the Scope as it is spelled out in 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 Hestlient Flexible - for use to 350F (177F) Type II Flexible - for use to 450F (232C) Type III Flexible - for use to 1000F (53flC) This revision would delete the words "below ambient and above ambient" for Types 1 and II and the words "above ambient" for Type IH. 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 on 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'1 so that the paragraph reads "The insulation covered by this specification shall be composed of mineral fibers with or without added binder...". Paragraph 5.1 - "Physical Requirements" - In Table 1 of Thermal Conduct ivities, the heading for Type II material should read "up to pcf". There should be no column for insulation heavier then pcf, as none are available. Under Type III Insulation, delete reference to density. Add the following K factors: Mean Temperature K Factor 1*00F 500F .76 1.20 Paragraph 8.2 - "Flexibility" - Change the reference to "the sample as re ceived" to read "a 12" x 12T| x 1" piece of insulation...". It is felt that ell testing to determine whether e product is flexible or rigid, etc., should be conducted on t 1" thick sample so as to properly cate gorize the material. Certain Insulation materials which are "flexible" in a 1" thickness might be classified es "rigid or semi-rigid" if tested in thick nesses of 3" or V. This could cause greet confusion with the specifying and purchasing factors end would also serve to improperly classify the product with regard to thermal conductivity end other physical properties of "flexible" or "rigid" materials. - 1* - 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 maxima temperature limits. It is felt that ASTM should quickly develop a suitable specification for mineral wool Insulations which could be used in determination of "minimum upper service temperature Unit". At present, there la disagreement among members of JfIMA 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 Ccenittee members. It was agreed, however, that when this specification is reviewed, considers* tion will be given to elimination of the words "below ambient and above ambient" in each of the five classes. This would be consistent with the previous comments regarding ASTM C553* FEDERAL SPECIFICATION HH-B-10QA I 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 September 30. He will con - solidate these comments and pass them on to GSA, who is working on tills sped ficetion. General A. Jack Barnhart distributed copies of letters sent by BZMA to the Neval Ship Engineering Center, Washington, 0. C. during the past several months consenting on proposed revisions to the following specifications: MXL-I-22023 MrL-I-7b2 MH-I-15^75 MH-I-2818 "Insulation Felt, Thermal and Sound Absorbing Felt, Fibrous Glass, Flexible" "Insulation Board, Fibrous dess" "Insulation Felt, Thermal, Fibrous Glass, Semi Rigid" "Insulation Blanket, Thermal, Fibrous Mineral" B. The subject of fire hazard classifications was discussed. It was again stated that NIMA encourage the establishment of classification categories such ss Clsss A, Class B, etc., wherein Cists A materials would have Maximum Flame Spread of 25 and Maximum Smoke Developed of 50 with thv other classifications having highar ratings. Charlie Ernst agreed to suonarize the information contained in the AMA Catalog and in Federal Specification SS-B-llS. IT agreeable to the Committee, these el as sifl cations would be proposed to Ghdezvriters Laboratory so that. hopcAilly, a standard aeries of classifications could be used in all specifications 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 accomplished 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 Valter 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 Jack Barnhart. This would enable ell neaber* to understand the thoughts and feelings of the various member companies, and should lead to more productive Committee meetings. It ves agreed that thia recommendation would be adopted. Respectfully submitted, Thomas C. Campbell