Document Rwkwe1242OxBBKNXb5E1j2k

552 CHAPTER 21 1957 Guide of pump used and the economics of small pipe size and high pump head versus large.pipe and low.pump head. Noise is also an important factor. Velocites are usually limited to a maximum of 4 fps for pipe sizes less than 2-in. .to reduce the. possibility of noise. Velocities up to 10 fps are frequently used in piping larger than 6-in. Average friction drops of 1.0 to 4.0 ft of water per lOO ft of pipe (120 to 480 milinches.per ft of pipe) are commonly used in sizing piping systems. The actual friction loss for a particular section of pipe.may, vary considerably from the average loss for the % Jj; ft % :^4 |J 3,000- -25 r20 2,000: : * : r`5 1,500-J HO . wooie eoo%8 600-J-5 500- 14 :400"^3 ;300t- r2 B aui2.-:rr' 5 Uo '`150-$ s. >05: f -0.5 1 S so-: O ;o S 20- 5 --12 -II 500-f- 40 100,000 -10,000 HO 400- ' . -30 300- - 200- : -15 50.000- -5,000 30.000- -3,000 20,000: r2,000 -: 9 a-t-e -? -e 10,000: H/500 : HO 100- Le eor r ; : -6: u" ^5k000-j-500 u 3,000- it2,000200 U 5<s 4~E-4 60- -5 5>4 ou ipoo:::-100- 3- 40 L. : - 8 uj 30t/t g 500ir50 S 300-+-30 I 2^-- -2.5 2 - it ` a ' -2 uQ.20.-* : ^ 200-- 20 * S -to : r^a 1 100 y :. 5S rt.Ot :: r J2 50* >2 -- 5 f 30::3 S \ 20- rZ yi T~. t BASED ON CLEAN PIPE WITH 140 F WATER Fig. 3. Friction Loss due .to Flow op Water in Iron Pipe** * {Based oii clean pipe and 140 F water) system due to the limitations of commercial pipe sizes. For example, if the average, friction loss is 2.0 ft of water per 100 ft of pipe (240 milinches per ft), the actual friction loss in,particular sections of pipe may vary from 1.0 to 3.0 ft.per 100 ft (120 to 360.milinches per ft). One method of sizing pipe is based on preliminary selection of a pump. The; head which the pump can produce is divided by the equivalent length of the longest circuit to obtain an average design friction loss. The equivalent length of a system or circuit is the length of pipe in series flow in the circuit, plus the length of pipe equivalent in resistance to the fittings and- also the equipment in series flow in the circuit. For prelimi nary calculation the equivalent length , is sometimes assumed to be 1.5 times the measured length.. \ P ip e Siz e -- N o m in a l nchesI M ay be Used fo r P relim inary Sizing of T ype L Copoer Tube. Hot Water Heating Systems 553 2<=g"g",8" g"g"g=g"g<:; g'Sg'rg^g-s-' g=>2'e-'>~ i?3204 r< '04 t-5eo2a* Sco*2"*cSo*2-*-2o'ir--t292". t'HioHiQrtiSHioM 8<eox.o<4e*>MlSttenec>o. S^g^g^g^g0 s-soovoa frtecot.5 Nai-ono-NMOiN opjcn-t-co-j' -- to-oio --* 04 04 CS 04 --co-co.-- co-<co--co.-i eo -- co co S S 5ooso3 bco on-? gN~nMSM"gw-wgi"ogio^ia: g"g^S'Se^g? Ngo^oSN^ogoSrSaS^oSS"a gd<=g"ogo'o"og- I s^g^g'rg'sg"! S";g`sggg^a".g'g=;gTOg^ * ^ W N CO CO CO CO ^ CO ^ CO M3 CO to CO CO O* CO CO V N h. N kfi DO tf, DO 3 00 O U3 0> CO A -g*g82^g gtogr-owoo, ccrict ---^^^^wioiciflwa cccooonoonmn ccNnh.nr.mao W^MCCWWWW^CC ^WIQWIOW on tt ^coNtNtoia nNO aNs <.aqas oM}. M3 04 COM3 OOCOOt 04 COCO M3 to n co a n n -m* >a co a o 04-- ec 4 04 CO 04 -O' o 04 o co to CO CD CO OnNnNnOCP oco taoaiooNact eocoto* oocooo-eoeo ioNaoon -- ** -- M* Q + to CO M3 04 tO 04 O 04 CO 04 CP 04 N. 0*4 Cr 04 N. 04 nI 04 OO CO OO CO saso--jOcoosco -O " -^C4 ~Q4 ~ ^a>tscNaa ,04omcomN.eoooco co eg co 04 co co cd 04 to 04 SOOO M3 N -- o> n a 00 o o o<o> 04 m3 cr AOTJ ScoScoSooScnSaj SGQSaQScoSgjSiE *ScoS*oqS*q2oS*2oq 2 gs 8 8 O04 8 8 0 04 O ON 8eo CO 0 eo 0 CO O OM3 8O' O 5 0 3 ONM3 i b e X - N* e S4* Ml 04 04 04 04 CO eo CO O' 06 g 1 CeoO N0M43- c3 s a 804 C04O g 2 eO CO t0f4t' 06 M3 |8 CO 8 sCO O 8 OOO 1 CO eo 8CO I0C--4O O a CO 04 804 s 5 0 OM3 s CcoO c0o4 0O4 c-- 00 0 0 UK n b 04 a H CO K R' 2 n 3 3 2 *2 i s0 8N- O to 1 0 3 04 eo s04 C0O4 M3 04 s04 5 M3 33NO 1 0 i O O M3 M3 NM3 | CCMOO3 00C4O Q04> NC0O4 CO 0e044o 04 804 o0o0 N00 OCOO 8 s* 1 804 0 8 O 8CO O M3 g OO 8CO C00O04 1 s NM043- O 04 to 04 o 04 804 O O H Pm aHH " 03 M I e g O 8 Ng 8 04 O 8 O 3 N3 8 04 i CD 084 SO i 04 O 8 tO O' CsO 0C0O40 8O 004 0 1 8co 1 CCtoOO I S e0o3 00eo0 CO0OO4 s04 0Oto4 NCCOO CoeOoo CO CO 04 M3 04 1 oCcoO> CO CO O CO 8CO 804 000444 O 04 804 0M0443 00C4O4 O04 04 r90--4 084 O 25 O K O Z O O04 O N 8CO O O 0co0 8 04 O i O sea M3 N OtCoO M3 00M43 CNO 1 00 S M83 O M3 8 04 CO N CO 0CtoO4 9 1 1 s 0tCoO 1 g04 0 04 - 04 0044 CO to 04 8 J. H | |i1 O 3 8 CCOO 8CO i i 0044 8 M3 CteoOo eccooo eo 8CO Ha 8 S3 0S4 I i O0 04 8CO C4 N s 0 s 1 Ntoo> N04 CO C3O eeoo CO0O4 00 004 0a w : CcSoO e 8 C4 a i 0 0 1 804 CCOOO ' OC0O OO 1 N004 sco 8CO <0 to OOO OM3 0 O CO i Na . cNcoo. CO a eo 8 8iO C0O4 04 0 ON 1 0O4' 0044 1 s0044 O0O044 0 s 0 s04 8 Qe>O 8CO NCeOo r~ CD' C00O40 SMo3 O 8 N N04 8 0 CO4 i O 3CO O s04 i 04 cCOO OCO 8 0 | 1 g s e <<CO00 iO O 0I0O00 tMIOO3 90M43 8to, s.. I | 1 1 04 a M3 8M3 co eo 804 00 0 1 -00o44* 00 8 i 'ONtO g*-- -1 CCOO 099