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Thermoplastic Valves Product Guide & Engineering Specifictions
Flanged Connections
Made in the U.S.A. Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Page 832
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Flanges are used extensively for connections where removable system components are desired. Such includes periodic system
servicing, anticipated system modification or add-on, and temporary component hookups. Flanges are also the standard con
nection for industrial butterfly type valves.
Pressure Ratings
Plastic pipe flanges are designed for system maximum internal
pressures of 150 psi, water at 73°F, which must be taken into
consideration when using flanges with higher pressure rated
components, such as pipe or valves. As with all thermoplastic
piping materials, pressure rating is a function of temperature.
Refer to “Temperature Pressure Rating for 150 psi
Flanges” chart below and that specified for individual prod-
ucts. Certain variations may exist according to product type
and size.
Bolt Holes & Pattern
Bolt patterns and number of bolt holes are the same as Class
150 metal flanges per ANSI B16.5.
Gaskets
Full faced, 1/8" thick elastomer gaskets with a Shore “A”
Durometer of approximately 70 is recommended.
Bolt Torque
Recommended Bolt torque requirements are shown below.
Threads should be clean and well lubricated. Actual field
conditions may require variations in these recommendations.
CAUTION: UNNECESSARY OVER TORQUING WILL
DAMAGE THE FLANGE.
Torque Sequence
Bolts should be tightened in a 180° opposing pattern
Recommended bolt torque sequence is shown in the following
table.
General Procedure Outline
Once a flange is attached to the pipe or valve, the method o
joining two flanges is as follows:
Step 1: Piping runs joined to the flanges must be installed in
a straight line position to the flange to avoid stress a
the flange due to misalignment. Piping must also be
secured and supported to prevent lateral movemen
which can create stress and damage the flange.
Step 2: With gasket in place, align the bolt holes of the
mating flanges by rotating the ring into position
(Consideration should be given to alignment of One
Piece Flange prior to joining with pipe.)
Step 3: Insert all bolts, washers (two standard flat washers
per bolt), and nuts.
Step 4: Make sure the faces of the mating surfaces are flush
against gasket prior to bolting down the flanges.
Step 5: Tighten the nuts by hand until they are snug
Establish uniform pressure over the flange face by
tightening the bolts in 5 ft.-lbs. increments according
to the sequence shown in the above table following
a 180° opposing sequence.
Step 6: Care must be taken to avoid “bending” the flange
when joining a Spears
®
flange to a “raised face
flange, or a wafer-style valve. Do not use bolts to
bring together improperly mated flanges.
Flange
Size
(in.)
1/2 - 1-1/2
2 - 4
5
6 - 8
10
12
14 - 24
Recommended
Torque
(ft. lbs.)
12
25
30
40
64
95
110
Temperature Pressure Rating
System Operating
Temperature °F (°C)
100
(38)
110
(43)
120
(49)
130
(54)
140
(60)
150
(66)
160
(71)
170
(77)
180
(82)
190
(88)
200
(93)
210
(99)
Flange
Pressure
Rating psi
(MPa)
PVC
150
(1.03)
135
(.93)
110
(.76)
75
(.52)
50
(.34)
-0-
(-0-)
-0-
(-0-)
-0-
(-0-)
-0-
(-0-)
-0-
(-0-)
-0-
(-0-)
-0-
(-0-)
CPVC
150
(1.03)
140
(.97)
130
(.90)
120
(.83)
110
(.76)
100
(.70)
90
(.62)
80
(.55)
70
(.48)
60
(.41)
50
(.34)
-0-
(-0-)
PP
150
(1.03)
105
(.72)
90
(.62)
80
(.55)
65
(.45)
50
(.34)
45
(.31)
30
(.21)
20
(.14)
-0-
(-0-)
-0-
(-0-)
-0-
(-0-)