Document zd59QkBa4KzxDQZ72xB5Ewyj3

American Society of Heating and Ventilating Engineers Guide, 1930 T a b le 2. E xtr a Strong W rought Pipe Table o f Standard Dimensions, Igassij |g 3 r Jo-5 og o l| 1S1s "3 g-i *-3 K 5*5 fT*O-tHwtfOO>Otr*O^5Ot0'0->^r-f,O*-~*-'O*'\NPw,0O<eM0M*'H'OCtCOMSiOaitoOOoO*'-Olt'-^fOOOOoOCroON^Ofr'0l^O*O>*0^-*-0'' odd^CSNf*5lONON^OOO^OO^O0 WPOiNvO^OtsOveHNWHO^^^O^NOO Or0i&CSoV0bHO^H^OrMJ^OrOO'O\0N0<ONOON'-*iNml/-)'''P3'ciO\UO'>fN*i vOrvOO 'hCON nO^--i '--Or> frrnotOtNf.' 'S990ior^^oO'p^^*^-iooofOf<?c^^ioio r-- -O O'- "* 0\ f*NO''oioro(NNHiHHiHdddddddd ^ *<OoOOOh^OO'0'ON')i/>i/50 ^'Ol/>'0^0p50'00'3io^rop0fy>evj 0r-i^^icoe'icse^*-<^*H HCOr~-Tj*'Ooor^cMiOf^'<di^^HCN 35 Sgft) . ^c<4t^Tj*'Ooo^cNjNO'^^'3*r>-fo^'0^ 000-h--CNjror>Tt,'Ocor4r^vdr-^Os 'SO2M?-'5T!fSfO3O!2r.p<o0Cr>>*P,iCO?ofro,Qno2o2e3^'Ti`^t>'C-fn>^'0 c,^VNO>^t>* *5scr .*-< ^ CM Tj< VO OO^OOOIOQO'^QOO c^HvsCOnNiPOoOOiOiTO*O'N0Of0*000''^0-i''O0OfortO<CTSjwM'HO'\i0^ )K'Ot*c*NM''wOogtrg5Tr*>' ...r..J..C....M....T...^..'.0..* C*M-<lO-'C?#N*cTo^toC*O*-`fN00e0M/^ ri0O^0^<jO.Cfvv*4l)O^l'^p-f-r#f>)^(0-5iO0^r-s<^cQ^vOiOvoMOv--'---H'N`00O00CMO*h(M^OlO.O*0'O<2^CWCMOf^TtO^jH>-' o; h Jn td`*d ^'dt^0'c>joooc^t--<,<>'0 33 SI tmvO'O*M* rtO\ --'^*v->''00''0-<5r*a''O'0Wr--N*'-f*->'e'iofOcNi*Ht*M*/7,> Cl '*-< CM w-CMOt<^*n*-'^00eM*'O' -i~HeMCMt*}^*ou'>t,'-\cMTit''t'-.t*5 ,j8. g cm o r^Oj 8CM0N0C'SC0P0*)--^tr<-p*<'*>)OfOC.f,pMt) to>0>w0<0wPc/)jc0i *0-2Cc*M5'TOteM^'i,'Ota>o*t*5\fC<5M'O,^C,M'Y-t<*N>0^CioMCMoOOO 111 "f^^-Hcscscocd^didi^odov^' ^o\0O9v|NocnO#i^ciOh0'0O^O'CItO>0.Oin0OOtOOOtO'OCtOON*NNn OioN'0to*'OOtW^r^Vt^1 ' -GCM CNCO'^<^t,tO'OOOON-lCN :ssssssss: ^ ^ x 302 Chapter 18--Pipe and Fittings The oxy-acetylene torch, both for welding and for cutting, and the electric arc may be used to cut the pipe to the proper length and to bevel the ends for welding. It can also be used for cutting out the walls of the pipe to receive the branches. The torch may be used for joining piping, both with lapped and butt welds and for welding branches into the main lines. The electric arc may be used where welding is to be done on flanges, making a fillet weld. Fittings often cause so much friction as to impair seriously the smooth and rapid transportation of the piped material. With the application of pipe bending and welds all branches and all changes in direction can be made with long sweep turns, greatly reducing friction at the bends. Whenever a branch is joined to a main, templates should be used for cutting the hole through the wall of the main pipe and for preparing the end of the branch pipe. The branch pipe should not project inside the main but should fit snugly against the main so that with the process of welding no surplus metal will drop into the interior of the main. When a branch is taken off from a main line and there is very little room for expansion it is good practice and very easy to weld in a reenforced brace between the branch and the main line. This is particularly true on large piping where high temperatures occur. In changing the direction of the run of pipe it is better to use bends than to use fittings and nipples. Special welding-fittings of uniform thickness are manufactured in all pipe sizes. These bends can be cut with the welding torch to any desired angle. Welding rods of high grade material should be used on all welds. The more complicated the turn and the more severe the strain and service the better quality the rod must be. Expert workmanship and correct engineering are of no avail if the welding rod is of improper character. Steamfitters are now being trained as rapidly as possible in various schools throughout the country to handle the welding and cutting torch and to perform the electric arc weld. Since welding is a new industry there is some danger that failures may occur unless great care is taken with the workmanship. The following rules are basic in welding practice and should be followed rigidly: 1. A skilled operator with the torch or arc, preferably a steamfitter, should be employed. 2. The proper welding rod and electrode must be supplied. 3. The choice of oxygen-acetylene or electric arc will be governed by the adaptability of each for the particular installation. 4. Templates shall be used for all cuts, with joints which are to be welded fitted closely, prior to starting the welding. 5. Standard welding tools and equipment of recognized make should be used. The cost on small installations using welding is said to be higher than that using threaded fittings. 303