Document r6xDBVvYkw64QbMa11OKQwQvE

SOUTH CHARLESTON PLANT UNION CARBIDE CORPORATION CHEMICALS AND PLASTICS P.O. BOX SOOA, SOUTH CHARLESTON, W. VA. 25.10J January 7, 1977 DO Ar\ Ms. Susan Wyatt Emission Standards and Engineering Office of Air Quality Planning and Standards United States Environmental Protection Agency Research Triangle Park North Carolina 27711 Subject: Additional Data]Union Carbide Corporation's Request for Approval o?ISquivateHcfyr'96 1. 65 (b) (4) Leakage from Relief Valves Dear Ms. Wyatt: In answer to your telephone inquiry regarding Union Carbide Corporation's request for approval of equivalency 861. 65 (b) (4) Leakage from Relief Valves dated November 19, 1976 we offer the following additional information: Union Carbide Corporation's proposal to use "O" ring seat pressure seal safety relief valves in vinyl chloride service is based upon the use of "O" ring gaskets in vinyl chloride service since 1952 and the use of the "O" ring seat pressure seal safety relief valve since 1969. The only innovation involved is the use of the "O" ring seat pressure seal safety relief valve in vinyl chloride service. (See Attachments I and 11 for data on conventional relief valves and the "O" ring seat pressure seal relief valves). Union Carbide Corporation has been engaged in the manufacture of organic chemicals and resins since before 1930. During this period it has established a base of safety technology and engineering standards which is widely recognized throughout the industry. We would not propose a safety relief valve system which did not meet our own and governmental agency standards for performance, longevity and safety. Union Carbide Corporation's relief valve comments on the EPA National Emission Standard for Vinyl Chloride dealt with its concern for process safety. You wished to know what documentation we had that "O" rings can be made of materials which are essentially impervious to chemical attack by vinyl chloride monomer. You wanted published information as opposed to a statement by Union Carbide Corporation. UCC 026328 Letter to Ms. Susan Wyatt January 7, 1977 Page Two Union Carbide Corporation has been unable to obtain any published data on vinyl chloride resistance by synthetic elastomers used for the manufacture of "O" ring gaskets. Experience has shown that vendor's information and published reports, if available, are not satisfactory material selection criteria unless they encompass laboratory testing, trial installations, followup and actual operating experience for the specific application. To meet its needs Union Carbide Corporation has a materials selection group as an integral part of its Engineering Division whose sole function is to study materials resistance to chemical and corrosion attack and to recommend specific materials for various applications. This group screens materials by laboratory testing and then tests promising ones under plant conditions. This program gives good reliability in selection of materials for process equipment. Attached is a tabulation of Union Carbide Corporation's laboratory test data on gasket materials (Attachment III) exposed to liquid vinyl chloride for 111 days at 33 "F. Tests show effect on hardness, volume and weight change as well as visual inspection, these items are summarized in a resistance rating. "R" means good resistance for any application. "F" means fair resistance, use depends on the specific service. "X" means unsuitable. For "O" ring gaskets the material must be resilient, not cold flow and resist solvation; thus, the potential "O" ring gaskets are Viton, Neoprene, Buna N, Hypalon and EPR. Plant tests and experience with Buna N, Viton and EPR have shown that "O" ring gaskets made from these materials perform well for long periods. The tabulation of test results shown is the accumulation of years of testing. As new materials are marketed they are tested in the laboratory and plant tests scheduled if they show merit. One such material is Dupont's Kalrez, a perfluoroelastomer (See Attachment IV). Kalrez is currently under laboratory test in vinyl chloride with completion scheduled March 1, 1977. This could conceivably be superior to the presently used Buna N, Viton and EPR in which case it would be used in vinyl chloride service. (The resistance to ethylene dichloride and vinyl acetate by Kalrez is excellent. } The ultimate test for any "O" ring material is its performance in plant manu facturing equipment in vinyl chloride service. "O" ring gaskets in vinyl chloride service at Union Carbide Corporation plants are as follows: 1. Eighteen dispersion resin polymerizers at South Charleston, West Virginia equipped with double mechanical seals on the agitators using Buna N "O" rings for shaft packing have been in service since 1952 without any seal failures due to "O" ring problems. New "O" ring gaskets are installed each time the seals are overhauled which occurs between six months and a year. (Most mechanical seals contain one or more "O" rings for shaft packing. See Attachment V.) UCC 026329 Letter to Ms. Susan Wyatt January 7, 1977 Page Three 2. Twenty-six suspension resin polymerizers at Texas City, Texas equipped with double mechanical seals on the agitators using Buna N "O" rings for shaft packing have been in service since i960 without any seal failures due to "O" ring problems. New "O" ring gaskets are installed during overhauls at one-to two-year intervals. 3. Forty-five double mechanical seals have been installed since 1974 on solvent resin polymerizers at South Charleston, West Virginia and Texas City, Texas using EPR "O" rings for shaft packing rings. No failures due to "O" ring problems have been experienced. This installation is too new to have data on seal overhaul schedules. 4. Fifteen pumps in vinyl chloride service at the Texas City, Texas plant have double mechanical seals with EPR "O" ring for shaft packing. These were in stalled in 1975; thus, no statement of "O" ring life can be made except that the rings are over one year old in liquid VCM service. Liquid vinyl chloride service is much more demanding than gaseous vinyl chloride service. 5. Forty-four quick opening Lenape manways equipped with EPR "O" ring gaskets are in service on suspension and dispersion resin reactors at South Charleston, West Virginia and Texas City, Texas since 1965. These gaskets are replaced after one-to two-weeks due to mechanical damage to the gasket from opening and closing the manway. There have been no gasket failures, however. 6. Union Carbide Corporation uses a fleet of eighty tank cars for vinyl chloride transport. Each car is equipped with "O" ring seat relief valves such as Midland Manufacturing Corporation type A-1150 equipped with Viton "O" rings on the seat and the stem. These valves are approved by the Association of American Rail roads for tank cars in vinyl chloride service. The safety valves are overhauled every five years and new "O" rings installed. Detectable leakage through these valves is unusual. In the year 1976 only one or two of these safety valves leaked and had to be replaced. These safety valves have only a single resilient gasket seat while the proposed safety valves have a lapped metal-to-metal seat and a resilient "Otr ring gasket seat; thus, resistance to leakage is much greater in the proposed safety valves, (See Attached Midland Manufacturing, Inc. tank car safety valve drawing. Attachment VI) Union Carbide Corporation is using "O" ring gaskets in many other vinyl chloride process equipment items including ball and plug valve stem packing. It is felt, however, that the preceding examples show that "O" ring gaskets are reliable in vinyl chloride service particularly with our program of annual overhaul of relief valves. UCC 026330 Letter to Ms. Susan Wyatt January 7, 1977 Page Four The second question you asked was what failure frequency rate would be ex pected for the "O" rings in the proposed safety valves. The preceding examples of "O" rings installed in vinyl chloride service indi cate long life. Based on the performance of "O" rings in the tank car relief valves and the fact that all plant relief valves are overhauled annually and new gaskets installed, the failure frequency rate for "O" rings in the proposed safety valves would be nil. The third question you asked was do we know of other companies who have used "O" ring seat pressure seal safety relief valves in VCM service. The safety valve vendor, Farris Teledyne, states that a major producer of vinyl chloride/polyvinyl chloride is purchasing the valves for vinyl chloride service. Despite telephone inquiries to many companies, we have not been able to confirm this statement by the vendor. In our request for equivalency we pointed out that the Chlorine Institute, Inc. accepted "O" ring seat pressure seal safety valves equipped with Viton "O" rings as equivalent to a rupture disc in series with a conventional safety valve. In terms of resistance to corrosion and to chemical attack as well as freedom from leakage and good valve reliability, this application is much more demand ing than the proposed use of the "O" ring seat pressure sealed safety valves in vinyl chloride service. As noted earlier. Union Carbide Corporation would not propose a device which we were not confident would perform as expected. Union Carbide Corporation has fifty "O" ring seat pressure sealed safety valves equipped with low temper ature Buna N "O" rings in ethylene service at its plants in Texas City, Texas; Victoria, Texas; Taft, Louisiana and Ponce, Puerto Rico. These have been performing as expected since 1969. More of this type of safety valve are being installed in our plants where freedom from leakage and positive reseating after relieving are critical. I hope this letter answers your specific questions on "O" ring gaskets and shows the sound technical base for Union Carbide Corporation's request that "O" ring seat pressure seal safety relief valves be approved as equivalent to 36 1.65 (b) (4) Leakage from Relief Valves. Very truly yours, R. in vynceier, jr RNWJr. /pm Attachments UCC 026331 Farris Saleiy-Relief Valves A i i-tt.v-.mvui.in j. i Farris "O" Ring Scat Pressure Seal for Conventional or BalanSeal Eliminates leakage and costly product loss as well as costly down time and maintenance on troublesome applications such a$: Operation too close to set pressure. Light, hard to hold fluids. Minute foreign particles. Vibratory applications. Coirosive fluids. Nozzle icing conditions. Discharge piping strains of sc DISC HOLDER ELAT HO MACH SCREW WRING RETAINER WRING SCAT SEAL NOZZLE BLOW DOWN RING JACK SCREW PLUG - l!! dr ,1 . ai L thru t orifjc* ifnf1 FUAT HO MACH SCRtW 3 CHSC- DISC. HOLOCR , ^/i Tl.* W RING SEAT SEAL----------------- ' . si V BLOW DOWN RHO *4* ! HQ22LC t - ,II . - J .tas t o thru k oniFice Recognizing the nrmt for a rosilinni '.o.d in n 'uifoiy- ielii'1 valve for exlu'iii*' tigidiM'-.s, I.iiit. I ngmernng Corporation lust made available an "O'* '.eat ai in early J')r>0. Although limili'il in |im**-siih*, tin* "()" Ring design received phenomenal an eptanro sinre it made possible complete tightness at pressviies much closer to the valve set pressure than was ever possible with the standard metal lo metal seats. the present "0" Ring Scat Pressure Seal design is an improvement which allows the use ol the "0" Ring Seat Seal to higher pressures and, equally important, the spring load is solely carried by the metal to metal por tion of the seat with the "0" Ring becoming a pressure seal within its recessed chamber and the outer edge of the nozzle, assuring the ultimate in tightness. The "0" Ring Seat Pressure Seal is available in our 2600 Series line of flanged safety-relief valves - con ventional or BalanSeal construction - for pressures up to a maviitiiun of IhOO Pfilft. ucc 026332 R^h'iiing In the *.i,l',rti<t tables on pages ?? thru d9, snle.ldute a "IV' lei lie- (ninth digit "A" in the type number Inr the i ooventinnal valve and a "()" for the fpuith digit "It" in the type uuinbei (nr the BalanSeal construction wh* n an "0" Ring Seat Seat is required: 26FA10 becomes 26FC f 0 (Conventional) 26FB10 becomes 26FDtO (BalanSeal) The pressure limit of the Conventional or BalanSeal valves covered in the selection tables is the same (or the O Ring design in alt type numbers and orilices with the 150 lb., 300 lb. and 600 lb. inlet flanges. On the "0" Ring design in all type numbers and orifices 1500 lbs. is the limit for the "0" Ring design, not the conventional valve limit shown in the selection tables & charts. Refer to "0" Ring Material Selection Chart on page 21 for Temperature and Pressure ratings of the various "0" Ring materials available. -/ Steel / Nangeu Why an "O* Rina Seal Pressure in th normal operation of a safety-relief valv* the disc must lift off the nozzle very slightly to "simmer,H allowing pressure buildup within the secondary orihco (huddling chamber), causing the valve to "pop" fully open. Simmering occurs many tiim-s rn the process industries where, as a result of process changes, minor upsets, etc., operating pressure fluctuates higher than normal, causing safety-relief valves to "simmer." but not lully open, flits will cause srimis misalignment in the valve and alter the pressure drops the valve will very often continue to leak helnw the normal operating pressure. While this can be overcome by actually popping tin; valve, this is not always possible. The use of the Tarns "0" Ring Seat Pressure Seal will always overcome this difficulty. As occurs very frequently operating pressures are too close to valve set pressures. As the operating pressure approaches the set pressure, seat loading is diminished reducing the force which affects tightness. With the use of the Farris "0" Ring Seat Pressure Seal, tightness can be obtained at relatively higher operating pressures than with metal to metat or other soft seat safety-relief valves. On light, hard to hold fluids such as hydrogen, helium, light hydrocarbon, anhydrous ammonia, etc,, metal to metal seats are olten penetrated, causing leakage problems. The Farris "0" Ring Seat Pressure Seal will overcome leakage on these hard to hoid fluids. On applications whcio heavy vibrations occur - i.e. barges, tankers, pumps, compressors, etc., leakage of metal to metal seats develop as a result for as the set pressure is approached the spring force is minimized and the vibration tends to reduce Ihe effect of spring loading, causing leakage. The Farris "0" Ring Seat Pressure Seal will maintain tightness as the spring force is not a factor in the tightness of the ' O" Ring design. Where occasional minute foreign particles are earned in the flowing medium, metal to metal seats are usually marred or scratched when the valve is blowing. This cieatcs troublesome leakage problems after Ihe valve closes, The Tarris "0" ring seat pressure seal will absorb without damage the impact of these particles and will eliminate particle deformation of the mating metal seating surface on the nozzle as the valve closes, thus reducing the incidence of leakage in valves on most process units. When necessary, simply replace the "0" ring to maintain tightness. Due to corrosion, metal to metol soots may eventually leak. With the proper selection of the Farris "0" Ring Seat Pressure Seal tightness can more satisfactorily be maintained. Nozzle icing conditions result from the refrigerant offcct of Ihe flowing media when a valve relieves. Ice actually forms on the seat, thus causing leakage. The Farris "0" Ring Sat Pressure Seal again overcomes this troublesome type ofleakage. Bawls* rMemmsntfttlon* tor `O' Ring ml*nsli BUNA N Ir rnhruriM MhmuIi Outana duteno Biitylfn* C.hHqif IMotftf# tiipmi nil MM Hfief MM* f* Clytef fiPhtis tfH ft 12 Futi Mil f JTItlttH IMlttm llpft'MPIt Ker*-f-nt Inn* Oil Nat>irl Oat HHtff**fl v,# mtom AeMyi'n* WrafcramldO Atf Amyl Mcoflol ArttcMor #1241 dentine RutMitM titan* fltffeno Butylene Careen DltelpMdf Carhee Tetrachltridf CJtlorlM (Of) fiat) ycfeft*i*rte Oewtfltrfti *`AM VITON (eftfVt.) Crhyl fftierfdo Cthylene ttnylene Clyeol MM Aienflot GnelM HflW* HtrrffcHFr(a At14 IWfliftfrrft Spfpftfdf Hnhiityi MtiM } * hi| JP 5 fuel Keratin* type Mi f Me wren MrfM*n* Ofchlorid* Ntuil Cm fliphtha Nitric Add Hitman Oionit* 0700 A |9>t NoP'he rropvl*ne Peepyt Aleehet Stnilft *rd Seleant idphe? Dietldo Sufpfi'irtc Add Talurna ItlcMorfftfcyffiid Turpentine Vlntfar Water Xylene SILICON! to Hfllvm Nitfattn OtyfteA These recommendation* art a julde only and terete* Die ot the "O'* flint I*. of count, dependent cm (cmperitvre, content'AMon*, ciUlyttt that mey M added and other condition* which ere teyond tor control. ucc 026333 <4 r r n Design And Analysis fcnajs-9,2 Pace 67 of 7H January. 1974_____________________ ATTACHMENT III CHEMICALS/PLASTICS I ELASTOMER AMD GASKET MATERIALS FOR CHEMICAL SERVICE The data In this section were obtained to provide personnel with useable Information for the rapid selection of a gasket material for a proposed service. Selection of the test chemicals used was based on representative homoglogs from all types of organic chemicals. By analogy, the data should be applicable for the proper selection of a gasket material for nearly any chemical mixture. It Is Important to understand that the presence of a very small quantity of an aggressive chemical may be sufficient to attack the elastomer through selective absorption of that chemical from the solution. Consequently, the testing of mixtures is always advisable unless the entire composition is stable and Innocous. The materials chosen for testing represent typical coimerclal products available In that category of material (e.g. butyl) In no manner Is It loplled that the material listed for that category Is either the best or the poorest of materials available In that group. i Initial data ware obtained by exposure of the gasket materials for 105 days at 7B*F In the chemical. Those materials showing good resistance to a chemical In the Initial exposure at 7B*F were evaluated in the tame environment at a higher temperature The crlurla used for the recoenendatlon were as follows: X Unsultable Volwne change of 30 percent or more Hardness change (Dura. A) of 15 points or more Height change of SO Mg/Cm^ or more ~ F Fair Volume changes of 10 to 30 per cent Hardness changes (Dura. A) of_5 to 15 points Height changes of 10 to 50(Mg/Cmr > R Recoamended Essentially no changes in the physical properties The rating of "F" (fair resistance) In the Table Indicates that a significant amount of attack occurred on the elastomer during the test. These data should be Interpreted to Indicate the elastomer would probably provide satisfactory service when compressed between two flange faces In a piping system, but could not be used as an exposed diaphragm In a value. The "R" rating would Indicate that the elastomer could be used In any service while "X" shows Inadequate resisWnce of the elastomer under any cl rcionsunces. Note: Teflon gaskets are resistant to all chemicals currently processed In the Division. Temperatures up to 320*C are allowable with the possible exception of amine exposures above 175*C. When using Teflon gaskets, do not use solid sheet material. The following are suitable gaskets where Teflon Is required. Johns-Manvllle 91 or 92 Garlock 8406 R/M Fluorobestos FIexon 500 Taskline (Duriron Co.) Teflon sponge Teflon felt Teflon envelopes ucc 026335 li 7 7 CHEMICAL RESISTANCE OF GASKET MATERIALS Test Chemical: Vinyl chloride Exposure: 111 days at 33F Gasket Material Viton A Neoprene 7797 Butyl K-53 Thiokol 3060 Block rubber 3773 Hardness (c)_________ Start End (0) ' 4e l^sTTBT 86 75 82 Of 66 49 71 58 68 55 83 63 75 72 Volume Change, % End (a) 48 hrs. (b) +18.8 + 0.6 +35.7 +29.3 +40.3 nil - 0.3 -1.0 Wt. Change, %(b) - 3.7 - 0.8 - 1.6 - 6.4 Color Solution (d) Yellow *-- Yellow Yellow Yellow Hycar, D-24 63 47 Buna N (OR-25) 83 71 Hypalon 72 -S'* Silicone No. 65 53 46 Buna S PK 46 40 S3 Natural rubber, gum 47 35 Red rubber No. 107 81 63 Adiprene L-100 45* 37* Saraloy 300 65 Garlock asbestos 7735 65* 68* U. S. asbestos No. 899 71* 67* 78 +37.5 87 +25.5 -- -- -*5S1 51 +39.6 56 +33.2 -- 46 +56.4 89 +35.9 43* +30.0 68* + 1.0 68* + 1.2 -17.6 - 9.9 - 3.8 -26.5 -10.8 - 8.2 + 0.3 + 0.3 + 0.3 - 0.8 - 9.1 ++* - 4.2 * ' -23.3 r -12.1 - 4.9 - 0.1 - 1.3 - 1.9 Yellow Yellow -- Yellow Yellow -- Yellow Yellow Yellow Yellow Yellow Comments on Specimen Slightly swollen SvOllen Swollen & tacky Swollen Swollen Slightly swollen S/tfA&f Sutfut Swollen Swollen S/zaiflf 5**rf* Swollen Swollen Swollen No visible chang No visible change Rating F P X X X X F P X X F X X X R R Re"-' 0)0 to O too> (a) Information obtained on the specimens immediately after removal from the solution. (b) Information obtained on the specimens after drying 48 hours at 78F. _ (c) Hardness expressed as Durometer "A" except where * appears. Asterisk indicatesDurometer "D" hardness. (d> Col or of solution at start of test was 5 Pt-Co. Resistance Rating: R - Resistance good; recommended material. F - Resistance fair; use of the material depends on specific service. X - Unsuitable. . This is true laboratory test data by Union Carbide Corporation - l-k-77 - /, y Given under my hand this 4th day of January 1977 Mu on ! // J. C. Canterbujry /" " fa y 1977. My commission expires July 7, 1979 NOTARY PUBLIC INTERNAL CORRESPONDENCE ATTACHMENT IV CHEMICALS AND PLASTICS P. O. BOX 8361, SOUTH CHARLESTON, WEST VIRGINIA 25303 T Divilion location Copy to :. Canterbury Bldg, 770"346 MECCO May 25, 1973 Originating Dagt. Engineering folfieu SuMatt Chemical Resistance of DuPont's ECD-006- KAL KE2Perfluoroelastomer Black Vulcanizate In a continuing program to evaluate new elastomeric materials for possible use in chemical service, ECD-006 perfluoroelastomer, a synthetic rubber manufactured by E. I. DuPont de Nemours and Company has been tested. The material has far greater resistance to organic chemicals than any other fluoroelastomer evaluated. The ECD-006 is produced in both gum and black vulcanizates , the primary difference being the addition of carbon black to the black, vulcanizate to increase the mechanical strength. Only the black vulcanizate was evaluated in these tests. Results of the laboratory tests (Table I) indicate an exceptionally broad range of chemical resistance for ECD-006, although failure occurred in organic acid, aldehyde, latex and certain amine test media. Compared with "Viton A", another widely used fluoroelastom r, ECD-006 offers a much greater potential for use in organic chemical process streams. In addition to the superiority of ECD-006 over "Viton A" in chemical resistance, DuPont reports greatly improved continuous heat resist ance for ECD-006. The ECD-006 remains usefully elastic after 200 days at 260C (500F) compared to +40 days at 260C for "Viton A" according to their data. The physical properties of the two elastomers are reported by DuPont to be similar. The recommendation of ECD-006 over "Viton A" and possibly other elastomers would be obvious except that the price of ECD-006 is approximately 20 times that of "Viton A" at the present time. Hope fully, th* price of the new ECD-006 will be reduced with time. Ther may be special situations however, where the high cost of ECD-006 can be justified at the present time. UCC 026337 HTP/ds Attachment: 1 Table Notebook Referenc : 29JCC-62 H. T. Pritt 12043 Index: G, 23, 50, 119, 155, 157, 162, 166, 168, 181, 184, 187, 190, 194, 195, 197, 199,. 207, 208, 218, 221, 220. 223 . 239. 242 /M3.26'T TABLE I CHEMICAL RESISTANCE OF ECD-006 PERFLUOROELASTOMER Test Conditions: Specimens (3.0" x 0.5") of the elastomer were immersed in the following chemicals for 100 days at 45C. I Chemical Hardness Acetic Acid, Glacial Acetic Acid, 10% Acetic Anhydride 75 63 79 Ac tone 75 Acetonitrile Ammonium Hydroxide 75 75 Aviation Gas Benzene 73 75 Butanol Butyl Acetate 74 75 Butyl Carbitol Butyl Cellosolve Butyraldehyde Carbon Tetrachloride 75 75 71 69 Ethanol, SD-2B Ethyl Acetoacetate Ethylene Chlorohydrin Ethylenediamine Ethylene Dichloride Ethylene Glycol 2-Ethyl Hexanoic Acid FLEXOL Plasticizer DOP Formaldehyde 72 73 66 64 72 73 74 75 64 Mgs./CM Chance +40.95 +56.74 + 4.45 + 3.01 + 1.42 + 6.06 + 3.63 + 3.88 - 0.73 + 5.05 + 0.81 + 1.56 +39.1 +11.2 + 1.6 + 2.6 + 9.0 +20. 4 + 4.1 + 0. 16 + 0.9 + 0.2 +28.0 Gross Thick. Chance. Inches +0.012 +0.016 +0.002 +0.003 None +0.003 +0.001 Hone None +0.003 +0.001 +0.001 +0.019 +0.003 None None +0.005 +0.009 +0.001 None None None +0.007 t Comments ^Moderately swollen; no wrinkles Badly swollen; blistered; wrinkled Very slightly swollen; no other visible change. Very slightly swollen; no oth r visible change. No visible change. Very slightly swollen and bleached; no other visible change. Very slightly swollen; no other visible change. Very slightly swollen; no other visible change. No visible change. Very slightly swollen; no other visible change. No visible change. No visible change. Moderately swollen; blistered Slightly swollen; no other visible change. No visible change. No visible change. Slightly swollen and softened. Swollen and blistered. No visible change. No visible change. No visible change. No visible change. Moderately swollen and softened. ucc 026338 TABLE I (continued)1 Chemical Hardness Formic Acid, 90% Glyoxal, 40% Hexanol Hydrochloric Acid, 10% 42 75 75 73 Isophorone Kerosene Methanol Methyl Ethyl Ketone Monoe thanolamine Nitric Acid, 10% Phenol Sodium Hydroxide, 10% Sulfuric Acid, 98% 74 73 74 71 71 69 76 77 75 UCAR Latex WC-130 Vinyl Acetate Water at 90C 59 74 73 MgS ; /or Gross Thick. Chanee Chanee. Inches +131.9 + 2.9 + 1.5 + 7.3 +0.033 -0.010 None +0.002 + 1.8 + 1.4 + 1.6 + 3.1 + 2.2 + 12.0 + 1.8 + 3.7 + 5.6 None None None +0.001 +0.001 +0.003 None None None + 28.4 + 3.0 + 11.7 +0.010 +0.001 +0.004 Comments Badly swollen and softened. No visible change. No visible change. Very slightly swollen; no oth r visible change. No visible change. No visible change. No visible change. No visible change. No visible change. Slightly swollen and softened. No visible change. No visible change. Very slightly swollen; some absorption. Moderately swollen; softened. No visible change. Very slightly swollen; no other visible change. (1) Original hardness - 75 Durometer (Shore) A * No good. Based on previous standards of admissible changes in the properties of an elastomer when tested in this manner, the material should not be used in the chemical exposure listed.  a % Pump huuh'S Fluid prwtsurtI Scaling J -- Ks ft i.-,. jktvi* w- >j j HlA , I Shoulder against housing ATTACHMENT V ,T-, ,f " ' ` \ -- -- -- 'r-'-Tvjf 'futtC.g rtf.y - ., i ii i --i 1 Rings ioi;v/oar here Static scat * F * \ V' i /------------------------- > i ` ! - - 4 ^T o Sialic seat - I----- 3 Gaskets supply 'give* Starting front scratch, fat's design a typical ^ Simplest form of mechanical sail hat a shoulder <-n shaft pressing against inschiue housing, Kig. 1. This will work if housing and shoulder are troth finished properly and shaft is loaded against housing at all times so fluid inidc casing won't leak through.-But this isn't practical on most machines. For one thing, there is always some shaft end-play and run-out (gyration). There are other icasons, also. ' Naxt step is to press a sealing ring into the housing and press another ring on the shaft. Fig. 2. Now sealing surfaces of rings are easier to machine and lap. Also, rings can he renewed when they wear without machining sealing area of shaft or housing. But keeping shaft against the scaling area is a problem. So is shaft run-out or gyration because rings arc rigid and run-out would cau<-c leakage. Fig. 3 shows neat step: mounting of resilient gaskets in hack of ring* to give some movement to rings. This also seals fluid leakage around hack of rings. But trouble is this sim ple design is very seldom practieal because of the very limited shaft ond-motion these static seals (gaskets) can absorb. Besides, you won't' be able to obtain and maintain the correct contact fotee to keep sealing faces together. solution is to give either one of the sealing faces axial motion to absorb end-play and shaft tun-out, t|tus holding the rings together at all times. Fig. 4 shows one way to do this. Here we place a diaphragm in the housing. This flexible member gives the sealing ring more axial movement than the gasket we used in Fig. 3. Diaphragm should keep a steady pressure against the two rings so there's no leak age, even if shaft gyrates a little and it has some end-play. So the diaphragm serves three purposes: (1) acts as inner r r* r* iJ n ** R U U re1 MANUAL ON MCCIIANICAL SEA15 POWER MARCH 1954 4 Stationary seal Stating ring ' M'avtiiinogy rr irnrrgy (------------ Itoaung- ^ . Spring. . . ^ r1' ll> .. Cjr- At// .,,.IP Shaft ,-x-----------------------------^ flttre' , 1 \ Coshtt 6 Here is complete seal * L modern mechanical seal for our plant t> fi seal between seal ring and housing (2) serves as spring resilience. Shaft sleeve it held against a shoulder on shaft K \f member to rreate contact force, and (3) prevents rotation by a nut. Sleeve also acts as backing ring. If shaft is not between seal ring and housing. threaded as this one, then a setscrew through sleeve is used Typos of seals. There arc two basic types of mechanical to hold sleeve on the shaft. Sealing ring is held against U seals--stationary and rotating. In a stationary seal the mating ring with roil-type spring. Flat gasket between hous sealing ring is in the machine housing and doe* not move. ing and gland prevents leakage, ^rings seal casing fluid r;j In a rotating seal, the sealing ling turns with the shaft. along shaft, past sealing ring and jr^jack of mating ring. Seal shell. On a rotating seal. Fig. S, the seal shell is For bast results, fluid being scaled should be on the out press fitted onto the shaft. On a stationary seal, the shell is side of mechanical seal to it must trawl inward to seep pres* fitted into the housing. The seal shell is a member between seal faces. This is important--particle* in fluid to which the diaphragm is fastened and which was not used tend to travel towards a region of higher velocity. This in the previous four diagrams. e/Tect is distinct from centrifugal force, which also exists. Fig. 6 shows all the functional elements of a mechanical The effect is most pronounced with viscous liquids; it is seat Here the mating ring is wedged into the gland, with less with gases. Solids have less tendency to work between the O-ring preventing leakage around it, and giving it some seal faces with fluid on the outside of revolving ring. G G Stationary vs rotating mechanical seals Now you might ask why we have two types of seals. Here seldom used for high speeds. Main advantage is easy instal 0 are some answers to help you decide on how best to apply lation on straight shafts found in mu,-l machines. each type. Stationary seal needs back-up shoulder for positioning Advantages. Most machines have a rotating shaft with the mating ring. Shoulder's relative trueness to shaft will G stationary seals, sketch, left. Main advantage <>f this seal directly effect the face run-out of mating ring. is centrifugal forces don't wink on the flexible seal ring In rotating seal, mating ring is retained in housing. This because it's stationary. Mating ring is the only rotating housing is usually more easy to machine, therefore it holds member, hut it's comparatively small and is usually rigidly the locating shoulder in a truer plane. Since rotating seal G attached to shaft. This is done by either a clamping action ring is the flexible member, it' positioned hy the mating or over balanced hydraulic furccs which hold it firmly in ring faces. The seal itself can easily be locked hy a set place. These seals arc used on shafts that often travel at screw, friction fit or similar means on any smooth shaft. G 13,000 feet per minute (not rpm) or higher. Shaft diameter Anothor cdvonlugo for rotating seal is its use in chemical may be more than 3 in.. This means that the centrifugal solutions where solids may precipitate and tend to foul the forces developed can be extremely high. sliding-seal components. Because of centrifugal force, the On other hand, rotating mechanical seal is subject to rotating seal lias a greater tendency to free itself from centrifugal forces, sketch left. This keeps flexible seal-ring sludges and sediment. But stationary seals may have other from working freely against mating ring. So this design is design details that often better overcome this advantage. ... ....... 'S* MANUAt ON MECHANICAL SEALS ucc 026341 11 DOUBLE MECHANICAL SEAL ASSEMBLY TOLERANCE MCT SHOWN $.013 *004 JOC AB c ...... zoosinooi MIN 0 e 1F G H | | | toos roo; J K L1 \ _J__ 1 1 -i ! i 750 1 250 3'i TTI 2 123 `2000 Jl5 SIS 1 5-2 i *3* 2:*T<a: 3 1 LS*7 1409 '**' -i ft jri 1 1'5 , 2 i5ci;zi 1.672 1 715 1 i. SET 1 AJ* 1 3*21 1 2 3*2 2'37 1 754 16 * 1 ooc 1 SCO II 6?*' I0S2 1562' GS" i 1*23 Iff! it'SCI lit 7 i i: tiso 17SC 11 675; * J 2 375-2230 I4rzj>i 2 30CH 2173 2 Vn 25*22*37 2 If! 1130 >1* 76711.690* + *4 IISIIIIU1 *i +12 J922.20I3+''# l*t*\t07B 4%c 2047'2+40* 2 liit 1 Gl2 II *1*1 2 66*3342 2IOIt2209 2/6 I3TS i GTS *2 OOCi I43T is>rjtcs2' 2*SC'2*23 2 31212*37 1 I7f|tli*/1 1500 20CCI1'2*. ISTjIl'M 22971 T l2 2CS2|1*S''. 1423 EltS 1223CI 2SJ-li*I 1000*2373 lUg 24221 2*1 ISA* 2 IB * HI ` i 5 0*2- 2 337 24*4 "7* 1,1 1790 tISO123751 i 1 23ISCCO 2 347 2640 2 3+4 itit f3lf!f4J?| LETS tmUscot - 3 liTttSGZ 3 230*3 23 icon ito* i ^ LS3T 243*113*2i *000 2300(2623: COGS 23*212*4'i tits G5'17SC! gig? ]u'!u>ii 150 2 7301 1675 232 tilt 1 293*i * * * * * mili.iT 3 STS] 32SO J4J-^33 2 3 SCCi 3 I'S 33562 437 3*25-1 SCO 366713562 iTMlina 2< 17*TiloJ 1 2 69*1 2953 3*4 ,2922! 30+5' i !t5t4 I*; 5047 11401 3f4 IBM iioi ;4- 2373 2675 300CI *43? Sir 3C62a tsoo 5000 31231 * 3T30HSJS 3 *12'J*47 5 67513 730! HTf 1*1 tmumiM-i LHiilHMUi'l 1312 3042 1IG7I 1 3337131121 tszs 1123 3230. : 4IG7I4S62 2697 HIT 33.21 iirl.Hi 2790 3150 3375* . *312 I*.)? 1 IwlirosuaJ rmiFTrnfTZnmfTTTinr DO SEAL PARTS 1 ELAND !*( 2 INSERT fA THROAT IUUUNC 9 SEAL RING 34 SEAL RING 4 COUP. RING 5 COLLAR * V RING *A V RING SLEEVE COLLAR 10 VRING It SET SCREW 13 SET SCREW 14 ECCENTRIC WASHER I- N PI FOR SCALING FLUID INLET N AT'S ISO* APART POR VENT G DU'S MT 33*2 3437' tors 3373 3S0C> 1143*^35621 * 4 31214 *7 4437(4 3'2 4 43714 1.2 3000 |330C !!| * 4 542*437 3041 I1SG2 3S5*; . 4962'4437 Sits 13625 17501 .ilH.-U SIG7 3667*36121 46G7i!2 >IS15r0r ITlOlllrj. 1 h> iiiziuri . 46,214 H7 ISE ITg 3373 3973 (4000L * 2 15JI stri2: >900 4O0Oi4>2S: mi 4062*4 ft* Ills 4 12! 142*0 3GGT 4 lGT,43<2 . 3730 4250 41731 3Rit 4 3*2 4*37* 3179 43T3 43001 * . . - *I3*!*I Z 3062:037 lou'on 32SO 5 23 5230 3 `29 3112 3 67 5 312 1 67 3437133 2 mutuums ins IIIS > 3791 III l-N 344A| 4C?#| 4 3903 ww**'-* 1969 420314 ^6 4031 4093 *is 4 32*. 4^ ft] 42IR ut.hl 4261 44Ui4:n 4343 49Tll.;; ! 4406 OTiUte 4469 4S3i 4440 t <Mftt 4394 4 703|4W| 4696 4 70S' 4 4716 4*iii4i^ 15 SLEEVE C SPRINGS GASKET f SHAFT PNG. S SET SCREW >1 I THROTTLE RUSHINS V NOTE, WE SUGGEST PARTS 2V2A,3,3A,6,6A \ C,P,S ft G SE KEPT IN STOCK AS SPARES ALTERNATE GLAND A R RANGE MS NT FOR VENT 9 MA{N WITH THROTTLE SUSHIRG THE DIMENSIONS SHOWN ARE THE RECOMMENCE, tfWIfjlUU f 3SS7 443* 4 342: * 4000 4500 4*2*+ . 5 962*5 43? 1 4781 49911 4 M 4944 4 932 n T J ZZj ZZj " -----------3 ~~~ -i DURAMCTALUC CORPORATION 1 RAUMMlIOO. HIGH | DOUSLE INSIDE RO, PTO CARTRIDGE OATS 1**4.64 ISCALE NONE_____ } PRAWN W M J9RMMl R6 I )-5l.2271fecit Jl|* OCU& J , 1 jL ucc 026342 MIDLAND VALVES AND GAGES FITTINGS MOUNTINGS ACCESSORIES MIDLAND MANUFACTURING CORPORATION 7733 GROSS POINT ROAD - SKOKIE, ILLINOIS 60076 PHONE NUMBER; (312) 677-0333 A. SEE NOTE l AND 2 ATTACHMENT oroo) )Or=-r O SECTION "A-A" SIZE OF FLANGE HOLES: 7/6" is standard on all valves, except 3/4" on A-1033 and A-1039. If a special size of hole; i.e., 7/8" on A-1039 or 5/4" on A-1075 through A-1379 is desired, usesuff Any other Flange, Hole, use suffix J. 5CLT CIFCLE: is star.card on all valves. If a special 6olt Circle cf 5;" is desired, use suffix 3. Any otter 3olt Circle use suffix C. MOUNTING: The standard mounting on all valves, except A-1035 and A.-1G39, is the AAT Standard tongue and groove with an 00 of 4.745" .003 and an ID of 4.005".003. Or the A.-I035 and A-10. the standard mounting is a flat flange I no tongue and groove). If a special mounting 4.995" x 4.255" is desired, use suffix If a flat flange is desired for any valve 'otner tnan A-IC35 a A-1C39) use suffix F. For any other mounting use suffix P. EXAMPLE OF ORDERING FOP SPECIAL REiLMEE'*NTS: A-II50-h^4- is A-1150 valve with 4-3/4" with Holes on a 5s" '3olt Circle, with $ 4.995" x 4.255" tongue and groove .mount r:. APPROXIMATE WEIGHT OF VALVE - 25#, ' 1 T SAFETY VALVES A-1035 through A-1450 11 .. ITEM NO. l 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 22 NO. REQ'D. DESCRIPTION I TOP GUIDE l STEM l RETAINER 1 BODY t SPRING 1 FOLLOWER l SPRING GUIDE 1 TOP LOCK NUT 1 WASHER 1 SEAT "0" RING 1 STEM "0" RING l BOTT.ADJ.NUT i BOTT.LOCK NUT 4 STUD 4 STUD NUT 2 SEAL 1** 3" STD. PIPE 4* * 3/4" STUD 4** 3/4". NljIT 1 * * GASKET 1 '* MOUNTING 0 RING l NAMEPLATE MATERIAL FOR PART NUMBERS FOR SS TRIM VALVES A-1035 Thru A-1375 STL W/SS INSERT STAINLESS STEEL. CAD. PLT. STEEL. CAD. PLT. STEEL. CAD. PLT. MALL.IRON,CAD.PLTj STEEL. CAD. PLT. STEEL. CAO. PLT. LAMIN.NEOPRENE* BUNA N-70D* BUNA N-70D* STEEL. CAD. PLT. STEEL. CAD. PLT. ALLOY. CAD. PLT. STEEL. CAD. PLT. LEAD W/SS WIRE STEEL ALLOY STEEL STEEL LEAD BUNA N-70D* STAINLESS SEE SEE 10-1-XS 10-2-SS 10-3-CS 10-4-CS TABLE BELOW 10 - 6-Ml 10-7-CS 10 - 8 -CS 10-9-LN 10-10-BN 10-11-BN 10-12-CS 10-13-CS I0-I4-AS I0-I5-CS 10 -16-PB 10-17.CS 10 -18-AS 10-19-CS 10-20-PB 10-21-BN TABLE BELOW MATERIAL FOR STAINLESS VALVES STAINLESS STAINLESS STAINLESS STAINLESS STAINLESS STAINLESS STAINLESS STAINLESS LAMIN.NEOPRENE* BUNA N-70D* BUNA N-70D* STAINLESS STAINLESS STAINLESS STAINLESS LEAD W/SS WIRE STAINLESS STAINLESS STAINLESS LEAD BUNA N-70D* STAINLESS PART NUMBERS FOR A-1039 Thru A-1379 10-l-SS 10-2-SS 10 - 3 - SS 10 - 4-SS SEE TABLE BELOW 10-6-SS 10-7-SS 10-8.SS 10-9-LN 10-10-BN 10-11-BN 10-12-SS 10-13-SS 10-14-SS 10-15-SS 10-16-PB 10-17-SS 10 - 18-SS 10 -19 -SS 10 - 20-PB 10-21-BN SEE TABLE BELOW * Alternate material available. ** Hot furnished unless requested. PLEASE NOTE: PLATING ON PARTS CAN BE CHANGED OR ELIMINATED ON WHICHEVER PARTS CUSTOMER SPECIFIES. THE PLATING ON THE ABOVE PARTS IS TYPE RECOMMENDED FOR GENERAL SERVICE. VALVE NQ. A-1035 A- 1075 A - II50 A- 1225 A-1247 A-1300 A- 1375 A-1450 STAINlEGS TRIM VALVES PRESSURE CFM SPRIK3 SETT 1 HI (Air) HO. HAMEPLATE HO. 35 661 10 - 35-AS 12 - 35 -SS 75 1 109 10-75-AS 12 - 75 -SS 150 2004 10-150-AS 12- 150-SS 225 2884 10 - 225-AS 12 - 225-SS 247 3070 10 - 225-AS 12 - 247 -SS 300 3516 10 - 300-AS 12 - 300 - SS 375 4220 10 - 375-AS 1 2 - 375 -SS 450 4705 10450-AS 1 2 - 450 -SS VALVE HO. A-1039 A-1079 A-l154 A. 1229 A-1304 A-1379 STAINLESS VALVES PRESSURE CFM 'SETTING (Air) SPRING NO. 35 75 150 225 300 375 661 1113 1940 2670 3695 4615 10 - 39-SS 10-79 -SS 10-154-SS 10-229-SS 10-304-SS 10 -379-SS NAMEPLATE NO. 12-39-SS 12-79-SS 12-154-SS 12-229-SS 12-304-SS 12 - 379-SS ucc 026345 ) REVISED 1-4-67 J