How to Guide
96
Plastics Technical Manual
Pipe Size
In Inches
For systems where dismantling is required, flanging is a
convenient joining method. It is also an easy way to join plastic
and metallic systems.
FLANGE BOLT TIGHTENING SEQUENCE
Installation
+PJO UIF GMBOHF UP
the pipe using the
procedures shown in
the solvent cementing
or threading sections.
6TF B GVMM GBDFE
elastomeric gasket which is resistant to the chemicals
being conveyed in the piping system. A gasket
1
⁄8
w
thick
XJUI B %VSPNFUFS TDBMF i"w IBSEOFTT PG JT
normally satisfactory.
3. Align the flanges and gasket by inserting all of the bolts
through the mating flange bolt holes. Be sure to use
QSPQFSMZ TJ[FE nBU XBTIFST VOEFS BMM CPMU IFBET BOE
nuts.
6TFBUPSRVFXSFODIUP
tighten the bolts to the
torque values shown
below.
6TFPGUISFBEMVCSJDBOU
will ensure proper
torque. Confirm that
the thread lubricant is
chemically compatible
with pipe and fittings.
Recommended Torque
No. Bolt
Holes
Bolt
Diameter
Recommended
Torque ft/lbs
/PUF'MBOHFTNFFUUIFCPMUQBUUFSOSFRVJSFNFOUTPG"/4*"4.&#
1
⁄2 4
1
⁄2 10 - 15
3
⁄4 4
1
⁄2 10 - 15
1 4
1
⁄2 10 - 15
1
1
⁄4 4
1
⁄2 10 - 15
1
1
⁄2 4
1
⁄2 10 - 15
2 4
5
⁄8 20 - 30
2
1
⁄2 4
5
⁄8 20 - 30
3 4
5
⁄8 20 - 30
4 8
5
⁄8 20 - 30
6 8
3
⁄4 33 - 50
8 8
3
⁄4 33 - 50
10 12
7
⁄8 53 - 75
12 12
7
⁄8 53 - 75
INSTALLATION PROCEDURES
4. Sequentially tighten the bolts corresponding to the
QBUUFSOTTIPXOCFMPX/FXCPMUTBOEOVUTTIPVMECFVTFE
for proper torque.
5. Ensure that the mating surfaces are in direct contact. A
gap between the flange face and mating surface may result
in flange failure. Do not connect to lug type appurtenances
without additional flange support.
Flanges
;nY[[Z_d]h[Yecc[dZ[Z\bWd][Xebjjehgk[cWoh[ikbj_d
Yecfed[djZWcW]["ioij[c\W_bkh[WdZfhef[hjoZWcW][$
Ki[j^[fhef[hXebjj_]^j[d_d]i[gk[dY[WicWha[Zedj^[
\bWd][$
CWa[ikh[j^[ioij[c_i_dfhef[hWb_]dc[dj$
<bWd][i cWo dej X[ ki[Z je ZhWm f_f_d] Wii[cXb_[i
je][j^[h$
<bWjmWi^[hickijX[ki[ZkdZ[h[l[hodkjWdZXebj^[WZ$
;dikh[j^Wjj^[cWj_d]ikh\WY[iWh[_dZ_h[YjYedjWYj$7]Wf
X[jm[[dj^[\bWd][\WY[WdZcWj_d]ikh\WY[cWoh[ikbj_d
\bWd][\W_bkh[$
System Operating Temp. 70 80 90 100 110 120 130 140 150 160 170 180 200
Temperature °F (C) (23) (27) (32) (38) (43) (49) (54) (60) (66) (71) (77) (82) (93)
17$ /3 /3 /3 /3 /3
$17$ /3 /3 /3
Pressure Rating of PVC and CPVC Flanges at Elevated Temperatures
1
⁄2
w
- 6
w
Pressure
Rating (psi)
/3/PU3FDPNNFOEFE