Document JN5mYGXozxRpLeKy1yybYjvNa

1 MINUTES of the GOVERNMENT TECHNICAL & RESEARCH COMMITTEE MEETING Land Session NATIONAL INSULATION MANUFACTURERS ASSOCIATION Washington, D, C, May 21, 1963 The meeting was called to order by W, E, Miller, the Washington Chairman of the NIMA Committee, who appointed K, M. Ritchie as Chairman protem for this session with the following in attendance: Shigeki Hiratsuka A. L, Graul J, S. King R. J. F elLc L, H, Mills F. A. Govan W. E. Miller K, M. Ritchie P, L. Losse C. E, Ernst Walter Gubar J* F, Lynch R. L, Strickland V, L, Miller W. T. Irwin Office, Chief of Engineers, Dept, of Army Bureau of Yards & Docks U, S, Veterans Administration Eng, Div, H, Q,, U, S*- Air Force Public Bldgs, Service - GSA National. Academy of Science - BRAB Pittsburgh Coming Corp, Baldwin-Ehret-Hill, Inc, The Eagle-Picher Company Johns-Manville Sales Corp* Gustia-Bacon Mfg, Company Johns-Manville Sales Corp, Gustin-Bacon Mfg, Company Pittsburgh Coming Corp, Pittsburgh Plate Glass Co. I* "Thermal Insulation for Mechanical Systems'* Section 692 of Mechanical Specifications prepared by the Veterans Administration, Mr, J* S. King supplied copies of the latest revision of this for comment. He noted that because of its importance in hospital construction, the Fire Resistance, and particularly Smoke Development Requirements of insulation was given a prominent place. Many of the details of application and finishing conformed to the Washington Contractors* Association "Specification for Non-Conducting Covering," Comparison of the thickness specified for pipe insulation with those in the new BRAB Report #45 to the Federal Construction-Council (see Subject IB) showed some differences which can be eliminated if K-factor is taken into account, Mr, King requested suggestions for improvement of the draft circulated. ( 2 II* Proposed Revision - Federal Specification HH-I-523A "Insulation Block, Pipe Insulation, Thermal Calcium Silicate (For temperatures up to 1200 F), " Points discussed. 1. Elimination of calcium silicate cement was agreed to, but raised the question of fitting insulation. It was pointed out that other cements are available for this purpose. 2* The government people expressed a preference for fabricated fitting covers and inquired as to availability. It was reported that such covers can usually be fabricated by contractors, although availability and economics may vary appreciably in.different areas of the country. Manufacturers of calcium silicate pipe insulation do not offer fabricated covers-as-a standard item, although at least one offers pre-cut pieces for on-the-job assembly* 3. Inclusion of classes based on surface coverings, was favored in principle by the government representatives. Discussion of the listing and specifying the various jackets, indicated a need for a separate "jacket" specification which might be referenced in the various material specifications for the specific jackets needed. This would include all pertinent properties and specifications. 3, For the proposed HH-I-523 revision in the meantime the list of jackets in the current draft needs review and some amplification. A* L. Graul requested that Section 6 on intended use, be expanded with information on specific use of jackets; e. g., for indoor and outdoot use, fire protection, vapor-barrier protection, etc* 4. Paragraph 3.1* 2 on "Cement" is to be deleted. 5, Physical Requirements - Table I F. Govan and A. L. Graul stated that the maximum values for density and thermal conductivity were unnecessarily high, in view of data re cently assembled from manufacturers. It was pointed out that the values were limits, and not design or average performance values. These values are to be reviewed by N1MA. A similar question as to the maxi mum allowable linear shrinkage (2%) is also to be reviewed. 6. The minimum weight of canvas (1*8 oz.) for Class 2 was questioned. This should be reviewed by NIMA, along with Class I, since this weight of canvas serves little or no purpose after installation and is often covered with other material. 3 7. Paragraph 3, 3. 4 on. Bands. It was requested that this be expanded to include aluminum and stainless steel bands, in addition to steel, and Section 6 should explain their choice. 8, Fire Hazard Classification Test, It was pointed out that available methods can be used only on flat specimens and not on jacketed pipe insulation sections, and that test results on components cannot be translated directly into results on assemblies. It was requested that ASTM E-84 be referenced instead of UL 723, although there are differences in procedure which may affect results on specific materials. This whole subject should be reviewed further by NIMA and a recom mendation made. HU Perforamence Characteristics of Thermal Insulating Materials, F. A, Goven was requested to report on this BRAB assignment from the Federal Construction Council, He stated that they had prepared and sent to interested Federal Agnecies a sheet listing 26 materials with trade names and properties. Owing to legal complexities, this list will not be available to industry. However, the BRAB Report #45 has been issued as ''Thickness Chart3 and Material Characteristics for Pipe Insulations" and is available from the Publishing Office, National Academy of Science 2101 Constitution Avenue, Washington 25, D. C, Publication # 1084 - $2, 00 per copy This contains thicknesses for various pipe temperatures based on ''economic thickness" adapted to the specialized cost considerations existing in govern ment installations. It also lists eight significant characteristics of materials selected from a list of 40 or more, as follows: Thermal Conductivity Density Compressive Strength Flexural Strength Thermal Shrinkage Temperature Range Combustibility Compatibility (with finishes etc,-) Mr. Govan requested NIMA comment on the choice of data and material in Report #45, IV, Proposed Revision - Federal Specification HH-I-500a "Insulating Cements" Due to lack of time, this was not discussed fully. It was stated the omission of physical property tables, instead of which ASTM material specifications were referenced, gave insufficient information for selecting a particular type. A further review and recommendation should be made by NIMA, 4 The meeting was adjourned for lunch to meet afterwards in joint session with the Marine group. K* M; Ritchie