Document bZk90VaOeEMo5VkQ4LEY95B1

American Society of Heating and Ventilating Engineers Guide, 1934 N o m inal W bio bt per F oot Pla in E nds Pounds T able 2. Extra Strong W rought Pipe Table of Standard Dimensions ^-trofOoor-'-t'-O'tocM'OioOop^^ooco*-* ^H-HC'JeSf,5*Ot-C'IT*<OOr2^hn s oo BP H j S5 o H 8* 3 g S 3s|o <Sg O o |s 18 0* o CQ o C8 _B B< II ll eo OnO'OO-h-hCMOOO'O t- 0\ *0 eo CN ^ fO CM - 'OooO`or*^oO'OOi^b'ooooo^no t--C'l`i'0OrOCN<,>>I^H"-*^-< tH H ^rOOOJ^r'^'^OoOOO^tPCOO'ONiO^ ^<0'00'00'f00t00'00'0>0'tr0fs 0\li0^frKNCSM^i--i^OOOOOO L 1 PER 3.2 So? o\u,)>,>esfOfOCO'Ot^io^i>'**,Q'00,t -h^CN t+> to ^'OOON'OO* K < a gp 00^csxi<t*ru^0'cs:oco^^ov0'0'd' s g 5c aCQ ^-''-'^^*'Ooo^-*oono*0'^oo CM q't* O Xs 2c OvO'OO'^'OOO'^'iOOCM^-i'O^I'gCN'OrO'O *-SfOlOOOf,^'-iCO^,T'0 too. ro Tt< r-- VO 666 6 6^n<n^'0 0\nt- <o(^S 3tO oW)oOo'Mn Internal Inches 2;0'-H'0cNrM2;L0t^^ 00(')^,*500fsONHirtOrtOO''00 Ra v-H ri CM CO to g ato> e cM-''Ocs^csO'^`ovo^H^*cor^- o *HrHNNfO^,`OlOtNO^'Oi-Ni w^,tiH'O(SbC'MtOtOOV External Inches j<as a ii s g| HH *H "eJ_ MS 2-2 g a O,Qh cv-* < 1 Q iOO''O^*^O'-HC00'O00t>-^>CM 0\iHM^`Ol>*0'0'^t>0-HtOIN"tOO0 g^(^,SrHi-iiHCMMestOtOtOtO,S'0>0`0 dooooooooooooooooo >ncN(0'Ocsts.oooatoQHj'OfOiHioo ^CM^^ior-OtOCMOOCMi-jOCN IOV) CStO^,`Oh-0'CNl>00'tOO'tOOOOOt>'ONC' O iHiH*HCMNf00^0t'0'^ n^NTriO'H'OONNOQO'OCNtSiOiO 90'0000f0'00't000*0v,0,0'0'0ls*t^ 0000'-,*~,'-,'HC41NtO^,,#,0'000N External Inches 8 ieeI nches ^rH*HCSCStOtO^*lO'OOOOCS 492 Chapter 34--Pipe, Fittings, Welding double-offset expansion Z7-bend, or the circle bend (Fig. 1); (2) a built-up bend composed of several of the smaller curved pieces illustrated in Fig. 1; (3) a combination of straight pieces with such curved pieces or cast ells; (4) a so-called square bend made up entirely of straight pieces, cast ells, etc. All risers must be anchored and safeguarded so that the difference in length when hot from the length when cold shall not disarrange the normal and orderly provisions for drainage of the branches. It is especially necessary with light-weight radiators so to anchor and so to give freedom for expansion of the piping that no strain therefrom shall be allowed to distort the radiators. When expansion strains from the pipes are permitted to reach these light metal heaters they usually emit sounds of distress which are exceedingly troublesome. The linear expansion of the pipe can be determined from Table 3. The elongation values in this table were computed from the following formula: where Lt = length at temperature t degrees Fahrenheit, feet. Lo -- length at 32 F, feet. t = final temperature, degrees Fahrenheit. a and 6 are constants as follows: Metal a Cast-iron..................................................... Steel........................................................... Wrought-Iron............................................ Copper......................... ................................ 0.005441 0.006212 0.006503 0.009278 6 0.001747 0.001623 0.001622 0.001244 In selecting expansion fittings it is well to allow a margin of 25 per cent between the computed expansion and the actual allowable travel of the expansion fitting to provide for inaccuracies in assembling, etc. Table 4 gives the dimensions of expansion offsets and bends required to take care of different amounts of expansion. FITTINGS Fittings for joining the separate lengths of pipe together are made in a variety of forms, and are either screwed or flanged, the former being generally used for the smaller sizes of pipe up to and including 3J^ in., and the latter for the larger sizes, 4 in. and above. Screwed fittings of large size as well as flanged fittings of small size are also made and are used for certain classes of work at the proper pressure. The material used for fittings is generally cast-iron, but in addition to this malleable iron, steel and steel alloys are also used, as well as various grades of brass or bronze. The material to be used depends on the character of the service and the pressure. As.in the case of pipe, there are several weights of fittings manufac tured, designed'to be used with pipe of corresponding grade. These varia- 493