Document 0g993B30YBO6aJ3E9OjXxm8nk

T able 1. Standard Wrought Pipe Table of Standard Dimensions American Society of Heating and Ventilating Engineers Guide, 1930 Hf* y 5 05 so Z 1,3 Sla B "<s !15QSSS,*lr;,HOoo"<^|^o>noaoo0(Nt^O'o M^'IOOO^'ONt^'OOOvOMOOOO'-'OCOrHOO^CSOb' 0000^-iNN()ior0'0^0\OOOT}'Ni/)iH'0>od Plain Ends h. O aH O, o S is is s JcSc3o "3 o SJ ^on'O^^nnhi-chhoooooooooooo ^O'0O'0O>f0Ov5f0O0\W'00^^'Wf0t^f0NM {M^ui^fo^NiN^^^doddo'ddddo'o'do' 0-<H(NfO't>or'Ot^N'0*Hroioo4r<)Q\THQ,^Iooi/) OOOOOOOO-<^NfSfr)Tttot>-Ci0a0'O--C<)NTj' a I < 1 =a J0Q*-O'iH^'fOCfl^O'OOgOir^^,VioWoO)r'HOfOOPOOOONOOi'COOC^'JOato>c.lo/lO'v)wtoirrO>nO?O!rv! a I Is OOOQOO^Nf')^'r0'N'HoCo'JlNHi^lON'OrO^oOcCoO<NnOdib'f-n^ s 1 = H CNMlOl^'OiO'OtOt^O-,-'M0 d'O*'0O(ONOt'M'OMO^t#'3OfO'OfO'oStO^K'0 s & OOOOOhcSN^^OnMiO^^WOONOOOoONN H^cSfOtOlONaaaOMCN Internal Inches !^2^2ir^2^)Si2?SS,r,~oovc>QOs0',4,v0`ri^^c^o^ooc40s .1 W-HiOOs<ONfO^'b*vO*-t'OOOOtOOOW^iOOv'0 a aoas -HTHiHTHMNcqnror^rOfOtO o r--coo'OoocMCNCMffioto OS 6 p^sOT^'O^'-,CslO\^ONtO^H^00c4t^*^t^-O\ "*$ tO to to r^. On o r} r-- r--- t-- CD co oOO Externa) Inches N ominal T hickness nches |I SS^2r!2252',:*,f'3'vt-*oo t-- cvuNOM^imooio --< -* (vj psj fsj pq fg fvj f-vj ro CN ro ro rO fO f*5 oo. ssJ 2'O^'CO 2?\ ccmi^cm5t}<'CoO *--<*'Os*'0$^0'cOm tr$^<* Oto*t---*i o->o *hOn', co*-i com ooo TM to ^ 00 S.fO 'O o ON & ^ *2 S g S g la S a/-'"" ~H^H^HcvjCsirotT>Tf*io vooo c^oo-HC^evi 3 .< < Q Ij ^Q2x1t2!?2^2!`502"2l'O21O2fs1`N2O2O2O\O^t^>^)NtGNfii-nii/onmoro>oirtotnoui ^*0'0fi0f)'0(?>f,)00*00i0i0'0'0'0'0t^t^t'*bt^bs "5,5 W '--l *`-H "1 * C'l 0-4 C<) Tf i/"5 vO OO OO Ov --* CN p\j ll . 03 55 ~*^^H<\|Cv>f<3<T>-<*m'000000\0^HCNCvj 300 Chapter 18--Pipe and Fittings Corrosion The electrolytic theoo^ of corrosionas formulated in 1903 by Dr. Whitney, led to the development of certain protective methods for closed water systems, which are based on the removal of dissolved oxygen from the water. Careful experiments in various research laboratories have demonstrated that the amount of corrosion found in such systems is almost directly proportional to the amount of oxygen in solution, and varies with the temperature. All reliable data on this subject indicate that the composition of the iron--i.e., the varying amount of carbon, phosphorous, manganese, sul phur, silicon, oxides, slag and copper usually found in wrought iron and soft steel--makes very. little difference in the amount or character of corrosion under water, although under atmospheric exposure the influence of composition is sometimes more marked. In practice, oxygen removal has been accomplished in two ways, namely; by de-aerating the water mechanically; and by fixing the free oxygen by chemical combination. .Suitable apparatus for this purpose is now on the market. Protec five Coa tings The introduction into piping systems of various chemical compounds, usually for forming a protective coating of thin deposit has apparently been rewarded with some success. Piping exposed to elements or buried in the ground is quite successfully protected by coatings of the ashphaltic type, usually applied hot. Cast Metal Piping There are available several types of cast ferrous metal piping made in special process to insure uniform wall thickness, which are believed to be exceedingly resistant to the agencies which so rapidly destroy wrought steel and iron piping used in heating systems. Wrought Iron Piping Genuine wrought iron piping has in many aged installations demon strated superior resistance to corrosion. Alloy Metal Piping Claims of superiority are made for wrought steel piping bearing a small alloy of copper. These claims, however, have not received general recog nition. They will, undoubtedly, be proved or disproved within a com paratively short time. Thread Cutting It is not usually practicable with threaded piping to screw all the threads into the fittings, so that there is left a raw metal cut, partly through the wall of the tube, inviting attack by outside influences. Welded or compression-flanged piping may have a longer life so far as attack from the exterior is concerned due to absence of this weak point. Pipe Welding ----- The application'of welding on the job gives to the heating industry an improved method of joining pipes. 301