10 BULLETIN 155, U. S. DEPARTMENT OF AGRICULTURE. 
Dimensions and weights of standard two-piece bands—Continued. 
[Dimensions in inches and weights in pounds.] 









Threads. | Nuts. |Washers. | Heads|B | Weights.” | 3 
7 33| 2 Z 
=| ra] eb 
€-| 28 Es 
8 E Bus S 5& 
Kind. 5 aehss Se Siveaiaes 
3 E BP) 28) |S doe oR ae 
: 1 | ced 5/as] 2 AQ Orn 
3 8] Jal818lsle (2ie| 22 |e | ep | 2 | SA 
= ea) 4 = ee g alo ah es i os] «a fon co) n 
@ GIMVIZ(E(S8/Slels lSlas) # ie Berta ict |e 
a &S Ajrls}o|t jaqjar = So 
w Alsl@#lalelaloiml/elel |e | 2le la] é 
SS eee ams he [aie De ee a ioe (es aa, cos SN Te be Fa se 
| 
Thread each end, | 106. 3! 4 146.3 
\\whread each “and, bs 5| 8) 1g] 1] 28] ota [----[---|---- | alt 350) : 
’ ee SOO oes 4,129.0 
eee SE aa eat 4005.0 : 
utton hea c : 
eee: ake | pet | |Jaat| +8) 12 eee | Ei? cre 55. 4} 4,060. 4 
PRL ere | ae | 1g | 2 -oad) ) ae 95.6} 4,100.6 
Thread each end, ‘151.1 4712.1 
square nut......... 1a) 5) 7) 133} sal 23] ziaglee--f-e-]--- spol areal Omeae 
Thread each end, | 124 4. 685 
ly 7, exaeonal Sere | 4 SOLO ki ee $ “9 
utton head each |) | | | aes 
end ian oe eee Pa | | | 14% 3 155,| ees as 66. 0 4, 587. 0 
Square head each |(--"|--"|--"[---"[---7 Ril | RS Te ary Vath | rests ce 115.2! 4,636.2 
ONG ance eee n peel 144) #4! 25 , 
Thread each end, 202.1 5,309.1 
square nut......... Mie 5 | 7] 2 | 14] 28] zita |----|---]---- a86ic < eace 
Thread each end, | | 174.0 5,281.1 
1 || hexagonal nut..... | ci) ae | Dome | er vat 
j | | ) . 
pubbony nese exeb |) "| | Fem Stes ee Raenetees | es bee 81.0) 5,149.5 
Square head each |{""*| | aN Me Gd Peal eat OU SH So oe thie tee | eee 135.5) 5,204.0 
oe al Eas Pai 





For determining the spacing of bands many formulas have been 
developed and diagrams have also been prepared for graphical de- 
termination.t The following formula prepared by S. Fortier has 
been very commonly used: 
S scan 
d=Gpp in which d equals distance between bands in inches. 
S=maximum tensile strength of each band in pounds. 
P=pressure of water in pounds per square inch in bottom of pipe. 
R=-internal radius of pipe in inches. 
C=coefficient to allow for strain caused by swelling of wood, and 
includes safety factor of about 4 or 5 for bands. 
The spacing of bands on some of the earlier pipes built was as 
wide as 16 inches or more, but at present 10 inches is considered the | 
maximum permissible, and on some important recent work the max- 
imum was placed much lower than this, even though the pressures 
did not require it. 
There is a tendency for the ends of staves to spring out when sub- 
jected to high pressure and often under light heads where bands are 
farther apart, if the pipe is exposed to the sun. In order to over- 
1 Engin. News, 60 (1908), p. 343. 


