Document rxq9pYwjzMmY1NM4pVaVkQxxe

FILE NAME: General Electric (GE) DATE: 1989 Nov DOC#: GE094 DOCUMENT DESCRIPTION: GE Technical Information Letter QS POWER GENERATION 1 SXVBS ROAD s c s e n e c t a d y , mr 12345 TECHNICAL INFORMATION OB POWER GSESRATX C8T0MBR SERVICE TZL 1052-4 GE SECTION LETTER November 10, 1989 ASBESTOS CONTAINING MATERIALS IN TURBINE-GENERATORS to: Steam Turbine-Generators PttXP9.au The purpose of this TIL is to advise customers of the potential locations of asbestos-containing materials in Utility and industrial steam turbine-generators and to provide information relative to non-asbestos substitutes which are now commercially available. B fie e e r v o f e e t la n e t n h e ta lc e n b v POSH t Tafln 1. Transmit the customer's section of this TIL to all utility and Industrial Steam Turbine-Generator customers. 2. Become familiar with the contents of this TIL in order to support customer related questions that may arise. Discussion: In view of recent regulatory trends with regard to asbestos, it may be important for customers to know where asbestos containing materials could be present in turbine-generators. This generic information is provided in the customer section of this TIL. This information is based on the factory practices at the time a unit was shipped and does not reflect any changes resulting from the replacement of any materials after shipment. The information is general in nature because factory records may not be representative of the unit now in place; materials could have been replaced by customers without GE's knowledge. COPYRIGHT GENERAL ELECTRIC COMPANY 1989 For um by Conorl ilo c trlc porwmot only. Hot to bo Smot or roproducod In Wwlo or port fo r uoo cutoido Control c ise trle aitiM jt ttw w p m ponotoolon of C w ia n r Oorvts* Ooportaont. CSD 100 -a- The goal of totally eliminating the use of all materials containing any asbestos in the manufacture of steam turbine-generators has been completed following phase-out which began in the early 1970's* This TIL is for information only and no specific actions are recommended or implied regarding the replacement of material containing asbestos. Regulatory compliance, such as maintenance and parts replacement, remains the customer's responsibility. The following provides general guidance to assist in answering customer questions regarding the elimination of the asbestos containing material from their units: (1) Heat retention materials for new installations are usually purchased and field installed by 6E to functional factory specifications. In some cases this material has been in the customer's scope of supply. Since the early 1970's, product department specifications have stated that all such heat retention material must be asbestos free. If the customer requests assistance in replacing heat retention materials with asbestos free materials, the following general specifications can be utilized: Schenectady Specification Drawings! 23319930 - Heat Retention Material. 23319931 - Removable Shell Joint Blankets. 23319932 - Removable Insulated Covers. Lvnn Specification Drawings! 1179J42 - Heat Resistant Material. 1179J43 - Removable Shell Joint Blankets. 1179J44 - Removable Insulated covers. (2) The sprayed-on sound insulation (sound deadening compound) on the inside surfaces of metal lagging can be removed and simply left off. Where sound insulation treatment is still desired, the best long-term approach is a treatment with asbestos-free materials mechanically fastened to the inside surfaces. Metal lagging drawings can be made available for the purpose of sourcing these materials from local suppliers. (3) Asbestos free spiral wound and flat sheet gaskets, stem packing and shaft seals are now available and other non-asbestos material substitutes are continuously being added to the stock of spare materials. (4) Non-asbestos electrical insulation materials are available for all applications and have been supplied for the past several years. Such material for repairs or replacement will be asbestos free when obtained from or specified by the factory. OB POVIS OSMBRATXOV CUSTOMER SSXVXCR - 3- TXL 1052-4 GB SECTION Expense Policyt All expenses related to actions taken as a result of this TIL are to be to the customer's account. ?rlori.Vz -S-gfl+t This -3a TIL contains technical information that is of importance to the long term availability-reliability of the units. List of Attachments: -Customer Section of the TIL. -Table 1 (4 pages) - Asbestos Containing Material in Turbine-Generators. -Schenectady and Lynn Specifications noted on page 2 of this t i l . index Wo i T.l.B. S G.l.A. Prepared bvi R.A. Lavry Approved fry RE Fenton, Manager Generator Engineering RS Couchman, Manager ST Engineering & Development Issued bv: k^/Flacelc, Manager ST Service Engineering Distribution - PGSD Managers, District Managers, Service Engineers, Supervisors, Specialists, Regional Generation Sales Managers and Engineers. - PSD, IMD and CGE Management (Reference: TIL Distribution List maintained by PSD Technical Support, Building 36-1E.) For uao by Conarai (lactrle poroamol only. Oat ta ba.aimai or roproduaart In baia ar part far ia* outatda Canaral llactrtc without dia iipriti paraiaaion af Cuataaar Sarvica hfartaaK. CSD 100A OB POWXB GBMBRATIOM X BZVBB ROM 8CS8NSCTADY, BY 12345 GB POWB GENERATION C08T0XBR SERVICB TIL 1052-4 TECHNICAL INFORMATION LETTER ASBESTOS COMTXIimiQ MATERIAL 1 TmBIME-OEIlEAATORM: Applicable tot Steam Turbine-Generators BlXBfiSS: The purpose of this Technical Information Letter is to inform our customers of the possible locations of asbestos containing materials in General Electric steam turbine-generators manufactured for Utility and Industrial applications. This information is being provided so that appropriate actions may be taken by each customer to comply with regulatory trends on this subject. The information provided is generic and applies to units in the "as-shipped" condition. The properties of asbestos make it desirable for applications such as in heat retention and sound deadening materials, electrical insulation systems, gasketing, stem packings, and shaft seals. Non-asbestos containing materials with equivalent needed properties have not always been available for many applications. As the health hazards of asbestos were recognized, new non-asbestos materials for all turbine-generator applications became available that enabled the current turbine-generator shipments to be asbestos free. Table 1 generically lists the potential locations of materials containing asbestos in turbine-generators, as manufactured. The table is structured by material type, general locations, specific locations and with summary comments. Applications of the previously used asbestos and/or the presently used non-asbestos substitution are described as follows: 1. Heat retention material used for thermal insulation has been typically purchased to functional specifications from insulation vendors and field installed. In the early 1970's, non-asbestos equivalent materials became available and the GE specifications were subsequently revised to prohibit the use of asbestos. The bulk of asbestos applied in turbine generators was used for heat retention application. Several types of asbestos free material are now commercially available for this application. COPYRIGHT GENERAL ELECTRIC COMPANY 1989 Date: November 10, 1989 e. SrwTSftsjysTFsunSsifc t &s k v ' 2- 2. Sprayed-on sound insulating non-asbestos materials were developed but they had poor adhesion characteristics. Current metal lagging designs do not require sound insulation, other non-asbestos sound insulating materials are available for existing metal laggings if sound deadening is a requirement. 3. Spiral wound gaskets have a filler material captured by the metal strip. In the new unused condition, the filler is captive but after service and disassembly the metal strip may be broken and the filler material exposed. Spiral wound gaskets with non-asbestos filler materials have been developed to replace the asbestos type and are now available from many sources. 4. Flat sheet gaskets are used extensively for low pressure and low temperature sealing applications. As with the spiral wounds, asbestos containing materials have been used exclusively and the industry has only recently developed suitable non-asbestos replacements. Because of the wide range of environments (which include steam, water, oil, air, and hydrogen) where flat gaskets are used, several different asbestos containing materials have been.utilized. Similarly, the industry has developed a variety of non-asbestos replacements but none are exact substitutes. Typically the non-asbestos products cannot be directly substituted for the asbestos gaskets and long term specific application must be confirmed by laboratory tests and actual usage. 5. Stem packing (soft) and shaft seals have also become available for asbestos free applications. 6. Non-asbestos insulating materials for electrical insulation applications have been developed and used for the past several years. Recommendation: Generic information regarding possible locations of materials containing asbestos in turbine-generators has been provided as an aid to resolve any actions that may arise as a result of this document. It is suggested that if non-asbestos material substitution is desired that the local GE Field Service Representative be contacted for specific material substitution definition and/or recommendations. When ordering replacement material, describe and/or provide as much detail information as possible that will help determine the correct replacement. In situations where the old-type asbestos containing materials are ordered by an old drawing number or as a non-catalog item, the correct replacement non-asbestos materials will be provided. Catalog ordering numbers should be used whenever possible to assure the quickest response and delivery. BMD GENERAL @ ELECTRIC Turbine Marketing and Projects Operation Customer Service Dtpartm cnt Tk MoI MothUm Ljtte M. i 052-< TABLE 1 ASBESTOS COMTAIUIUC MATERIAL IN TURBINE-GENERATORS ASBESTOS C0NTA1MIN6 MATERIAL TYPE HEAT RETENTION MATERIAL (1 .e . Theraal In su la tio n , Lagging) POTENTIAL LOCATIONS GENERAL Hot Surfacts i^ M O O F) SPECIFIC 'HP/IP casings 'Mam steaa piping 'Main stow valvts 'A u x iliary staaa v a lv ts 'Non ratura valvts -Mol stvra stparator and aal stvra s tparata r reheetars 'Staaa packing exhauster 'Staaa saal evaporator 'Secondary staaa piping and valves Staaa driven o il puaps and regulators COMMENTS Asbestos eltalnated froa GE sp e c ifi cations early 1970*$. Several asbestos free types of Material available coanarclally SOUND in su la tin g (Sprayed-on) Motal Lagging Internal Surfacts Turbine enclosure 'Eiapliasls lagging 'Generator lagging Excitatio n equlpaant lagging Sound Insulation Material ellalnoted on current slrlpaents. Can be reaoved and le f t off existing netal laggings. If sound deadening 1s s t il l required, non-asbestos, non-soraved-on Material Is availab le. GASKETS - Spiral Wound HP/IP Casings Balance holt access covers -Gib access covers -Inspection hole access covers -Borescope flange connections Asbestos-free replaceaent gaskets availab le. LP Innor Casing! s) 'Hand hole access covers -Borescope flange connections -Internal piping Main Staaa Piping HP shell flanges -RHT shell flanges -Crossover flanges -Crossround flanges -Cresseraend r e lie f valve aountlng flanges Crosseround piping aanways CSD 101A -Juaper pipes i ASBESTOS CONTAINING MATERIAL TYRE POTENTIAL LOCATIONS GENERAL SPECIFIC COMCNTS GASKETS Sp irt! Wound (c e n t'd ) Main Stoat Valvo AsteebHes (Main Stop. Control, Rotioat and Intorcopt Valves) Non Rotorn Valves -Valve heads -Belted-In seats -Bolted in le t Flanges -Bolted o u tlet flanges -CV stand Bolted stea hushing guides -Leakoff flanges -Toko to casing CV head -Eq u alizer valve flanges -$V Bypass seat A uxiliary Stoaa Valves 1EqualIz o r, Blovdoth, ven tilato r, Bypass, CV Startin g , Spood Matching, Cross over A dtlsslon, Extraction, Stoaa Son! Royalator) -Valve heeds -B0lted-1n seats -Bolted In le t flanges -Bolted o u tlet flanges -Bolted stea bushing guides -Leakoff flanges -Yeke/stand to casing Molsturo Separator (NS) -MS/MSR aaimops and Molsturo -MS/M5R drain tank naneays Separator Rehoatars(NSR) -Leak detection o rific e flanges Hoot Exchangers (Stoaa Packing Exhauster. Stoaa Seal Evaporator) SPE sh e ll drain SSE drain tank In le t SSE drain tank pipe connections Secondary Stoaa Piping and Valvos (Stoaa S e a l, External D rain. Moating 1 Cooling Stoaa, Bypass Systout, Vacuat Breaker Piping) -Flanged piping connections -Valve In le t flanges -Valve o u tle t flanges -Valve bonnet to body -R e lie f valve te st lever a ttac haunt Asbestos-free replacsnont gaskets availab le. t GENERAL ELECTRIC Turfoin Marketing and Projects Operabon Customer Service Department ASBESTOS CONTAINING MATERIAL TOE GASKETS F la t Sheet (*or Woven Cloth) POTENTIAL LOCATIONS GENERAL LP Casings SPECIFIC Inner casing access* Exhaust hood manways Last stage o rific e assent)/ Bearing cap access openings Exhaust flange Sight flow opening CSD 101A Packing Casings -Bolting flanges Pipe flanges Valve Chest -Valve chest cover Neat Exchangers Stew Packing Exhausters. Steam Seal Evaporators. O il Coolers, EMC Coolers, Stator Bar Coolers, A ir Coolers. Hydrogen Coolers) -Shell to tubesheet Shell o u tlet flange -Header to cover -Manwey cover -Uaterheador to cover -Materheador to tubesheet -Watarbox to cover -Shell flange to seal ring -Seal rin g to watarbox Hydraulic -Hydraulic mechanisms Applications bolted jo in ts HydraulIc -Housing access covers Mechanisms -Lube and hydraulic pipe (NNC) at Front flanges Standard, Hydraulic -011 pueps mounting flanges Enclosures, Booster punp cover Separate Hydr. -Lube o il tran sfer valve Cylinder mounting flange Assem blies, -Gage mountings Lube O il Tank, L if t -Switchbox eover Punp Assemblies, Front/Mid Standards, Taming Gear Housings, Thrust Bearing Wear Oetector, Oil Conditioners. F ilte rs) A ir Applications -A ir cylin d ers -A ir valves -A ir f il t e r regulators Generator -Access covers 1052-4 COfflENTS Woven cloth gaskets can be replaced with nonasbestos n ate rla ls or suitable non-asbestos sp ira l wound gaskets. Non-asbestos fla t sheet gasket M aterials available