Document 4a14GL9Konn042nM9N26r39LQ

C4 r. Johnson* Subjt Packing for Joint Faeos of Punp Casaa A meeting was hold Thursday afternoon, Octobar 10, 1940 in tha Restaurant and attandad by aeabars of tha Shop and Engineering Department for tha purpoaa of standardizing on aultabla shaat packing for uaa In our pumps. % Tha following persons wara In attendance at thla meeting* * Qartman, Mr. Hlley. Mr. Jurgensen, Mr. Chldley, Mr. Barratt, Mr. Leonard, Klar, Mr. Hupall, Mr. Toft, Mr. Martin, Mr. Quigley, Mr. Maaon and myaelf. l-W (-< -7 S U*9 WllUL <;*( Thla paeklng la now uaad on all multistage Pump joints and la also satisfactory for uaa on ataam joints. / 8aaplas of tha following makaa had baan Investigated previous to the meeting* "Taurll* Anchorite Packing. (This was our previous standard). #590 and #591 Belmont Packing Johns Manvllle packing {170, #172 and #190 Vellumold Packing #2150 John Crane Packing. Measuring of all these makes of packing Indicates that tha minimum variation that can be expected In tha thickness Is approximately1 10JC, which Incidentally Is the tolerance allowed In the navy Specification for this type of packing. It was, therefore, decided to purchase the packing to the following specifications In the future* I 015" .002". Only two of tbs samples available came up to this specification, the Bo. 591 Belmont Packing and the lo.2150 John Crane Packing. As the Belmont Packing sells for $.7Jp/lb. and the Crane Paeklng for $.39#/lb. It Is recommended that we purchase #2150 John Crane Flacking exclusively for the ^Ime being. This packing is not oil resistant and for oil joints it will still he neoessary to purchase Johns Manvllle #23 or a similar type 611 resistant peaking. ' It is also recommended that the pump oaslngs where the above packing la used be bored theoretically with a .012" thick ehlm.-- with necessary adjustments for mechanical conditions on the horizontal boring mills. TX0023 % Johnsons Bubji Packing for Joint Faces of Punp Coses csiB>m Mating fit* bttwin easing bore and diaphragms for stags pumps ';aafT` ^<S| .000* to .004* Loose for the smaller sizes, to .003" to #006" W the *1" and "P" sizes. It is reoonmended that the drawings M Changed uniformly to oall for a casing bore of nominal slse Pi*<# and a diaphragm size of - *002 below nominal with a tolerance of* This will giro a toleranoe of .002" Loose to .006" Loose. Gave rug fits will remain as at present, the bore being nominal alia 'rr.'ooo'` * and the case ring diameter nominal slse Die. The Joint faoes of our standard pumps wtre until rseantly rehad with ,007" Manila paper. It has now been decided to substitute better peeking material In the form of e plant fibre gasket .010" ;thlok made-bp- Tallumold and others. This packing is suitable for sitter# ell mad gasoline where the temperatures do not exceed about The plant fibre gasket has considerably mors compressibility theii the Manila paper previously used and it la raoommended that the pumps Ohara thla packing la used be bored theoretically with s .009" metal shim (with necessary adjustment for mechanical condition of boring mill) This la the same procedure as was used previously for tiering the casings whan using Manila paper gaskets. J, A. Brophy v<J V.V; '** JABtAp B.P.coplea to Msssrst Gartmsn, Jorgensen,Rlley, Salmon, Bookter. Martin, Chldley, Barrett, Leonard, Rupell, Klar, Dickinson, Toft# Quigley, and Mason, A. a. TX0024 t r e n t o n , n .j . DE LAVAL STEAM TURBINE CO. TX0025 Hi? i?y ^ Ov ^ V * ^ In *t ..8, *1 !$ ^ C^Q ft p I 15 p JOINTFACE GASKETS FOR CENTRIFUGAL PUMPS. IVi : $ s \ \1 X ^ ^ ^ IK 15 ^ iv, ^ iv, |i 1 ^ ^ J; yS^fbi 5j !^I W QQ C! <5j 5j 5j 5; o $ 3 s> 11 *& *^ a8 I t i it s I$ vv\|t 1^ a* $ Vi^ $*' h ?! ^ItH! b! *V> viy This standard applies to all joint surfaces. Table I lists the type of joint and the required material, and in Table II may be found a list of acceptable products for gasket material. This table vill be modified from tima to time as new materials are aocepted. The following specifications cover tbe conditions involved and the list of Table II gives trade names meeting these conditions. Sealing Compound shall be such that it vill hardeq and remain hard in a condition that vill withstand temperatures at 850F and pressures up to 900 psi. It must be sufficiently fluid to fill in the aaall grooves left by machining yet still allow the joint to be tightened to a metal to metal fit. Asbestos sheet packing shall be of uniform thickness throughout and shall conform to the following tolerances! .015? .002" and 1/32* +.002*. The quality of this material shall be such that It vill withstand"temperatures up to 750F and prsssures up to 600 psi, and the .01$ stock must be compressible to .012* to .013*. Plant fiber shall be oil and water resistant and shall have the ability to withstand temperatures up to 250F. It shall be of uniform thickness within the following tolerances, .010" .002", *015" *002" and 1/32" .002", and the .010" stock must be compressible to ,006" to .OO7". Ring end formed gaskets shall be able to withstand 900 psi or above, but since their application is special and varies with the machine, they should be specified by the Designer. Ajmco Iron snd other metal gaskets shall be able to withstand temperatures up to 750F and pressures between 600 pal and 900 psi. Since these in most eases will be formed gaskets, their applloatlon and source will be supplied by the t Designer. \ With turbine conditions below 2$0 psi and 450P there should be a note on the Bill of Material as follows! "Mostle face joint not ta be. lapped". A special route vill be required for any job with these conditions* Assembly drawings will indicate location, thickness and material for gaskets. Drawings need only be made for metal or other special gaskets. In all cases Bills of Ifeterial will carry the thickness and material for gaskets, however, in the case of precut types, as simple flange gaaknts, which can be entirely specified by inside diameter, outside diameter, thickness *,nd diameter 6f bolt elrole, the Bills of Material will carry the complete dimennidns. Scaling compound vill not be called for on assembly drawings or Bills of Material. Trade names will not be carried on Bills of Material for it vill be left Ijo Purchasing to procure material from any of the acceptable sources. As new materials are proposed for gaskets,1 samples shall first be submitted to the Engineering . Department for acceptance. ... NOTIi Vhen Bills of Material, for ptsrrps call for gaskets .015" to .010" thick, shims of .010" and .005" nominal thickness respectively shall be used in boring pump cases, etc. A note shoqld be added to the drawing aB follows! "Use proper shim for boring to suit gasket called for on joint faces of pump cases". DISTRIBOTIO* - Groups I, II, III, 17 * V, 71, VII 9-X7-5J Supersedes D* 3-30 dated STANDARD GASKETS Page 1 of 4 12-16-47 DATt CK. BY APTO. ALTCRAT40M3 OC LAVAL STtAM TURBINC CO. HC VK) rtcaroa. n. ,, Uu TX0026 V TABLE I TX0027 9-17-53 . JCT Supersedes DL 3-30 dated 12-16-47 ~ DATE CK. BY APP'D. ALTERATIONS ' DE LAVAL STEAM TURBINE CO. T_TO t Vi V) 5-B co O Q> o> o 00 u, a<.0 d 01)) -rC0*31) CO <3 a 25 ITS 2U. 3S Csl O <Nr*\ V\ u"\ A CN <AN A CN< o cv A W"\ A o 2 rH IA CM CA sO f<AN >'I'd rO-< r0\4 fCA4 XV XV O \rH \rH TABLE I ( c o n t'd .) DATE 0E LAVAL STEAM TURBINE CO. TRENTON N J DE 3-30 TX0028 tabt.k ti Sealing Compounds Copaltite Ualdurlan may be used for sealing compound when conditions are below 400F, but In no case Is It to be used behind nozzle rings for turbines. Asbestos Sheet Packings: Johns-Manville 60S Durahla Ankorlte #425 John Crane #2150 McKlm (Copper sheathed asbestos) Melrath #150 Plant Fibers: Hydro 11 Vellumold Melrath #1242 - "Sealtite* 9-17-5: . JCT DATE CK. BY JI4-I Supersedes " Dl 5-30 da'ted 12-16-47 ARP D. alterations STANDARD CASKETS. Page 4 of 4 OE LAVAL STEAK TURBINE CO. riCMTQN. N i DE 3-30 TX0G29