Chloride (PVC) Flanges
Stone Style Flange-Socket (Two-Piece)
Sizes 10" through 24" Diameter
Drilling Pattern.Class 150
Unique back-up rings are computer designed with a
configuration engineered for maximum performance. The combination of hubs
and back-up flange rings represent the most innovative two piece (Van Stone)
style flange available today.
of Bolt Holes
Sizes 10", 12", 14" and 16" flanges are Van Stone
style which means they have a free-floating ring that enables the bolt
holes to be aligned after the flange has been assembled to the pipe, greatly
simplifying installation. The Van Stone rings are manufactured from a glass
reinforced PVC composite called FIBERLOC (FIBERLOC is a material of BF
Goodrich.). This material increases strength and durability, and provides
a rigid mating surface that is less susceptible to stresses typically encountered
during field installation. These flanges are designed and manufactured
to Class 150 Specifications, per ANSI-B16.5 requirements. The sealing surface
is of a modified flat face design, in which raised ribs uniformly grip
the gasket material during compression, ensuring a leak proof seal. We
recommend the use of a full face, 1/8" thick, flat Neoprene gasket.
Sizes 18", 20" and 24" hubs are formed from durable
PVC pipe as a single piece construction, containing no cementing or hand
welding. These 18", 20" and 24" hubs include a convoluted style cast ductile
iron (ASTM536) back-up ring. Back-up rings include a baked-on polyester
resin coating. Bolt circle is ANSI-B16.5 Class 150. Our unique convoluted
style back-up ring design eliminates the need for bolt retightening because
of their capability to store elastic energy somewhat like a "Belleville
Washer".the flange preloads the bolts as they are tightened (see torque
recommendation and tightening pattern).
10" and 12" flanges are also available in Spigot
ends, and are also available in CPVC.
of Bolt Holes
1.0 Flanges 18" through 24" are fabricated
from pipe, not molded. Flanges 16" and under are molded.
2.0 Alignment is critical, as these flanges
are not designed to pull together under stress or pull the weight of the
piping system together.
3.0 Recommended 1/8" thick Neoprene gasket.
4.0 The faces of flanges are raised phonographic
grooved finished so that when the bolts are tightened, the faces will be
pulled together creating a positive seal on the gasket.
5.0 Once a flange is joined to pipe, the method
for joining two flanges together is as follows:
5.1 Make sure that all the bolt holes of
the matching flanges match up. It is not necessary to twist the flange
and pipe to achieve this.
5.2 Insert all bolts with full size flat
washers under heads and nuts.
5.3 Make sure that the faces of the mating
flanges are not separated prior to bolting down the flanges.
5.4 The bolts on the plastic flanges should
be tightened by hand until snug then by pulling down the nut diametrically
opposite each other using a torque wrench. Complete tightening should be
accomplished in stages and the final torque values in the following table
should be followed for the various sizes of flanges. Uniform stress across
the flange will eliminate leaky gaskets.
5.5 "CAUTION", THESE ARE PLASTIC FLANGES,
NOT STEEL.alignment must be achieved prior to tightening bolting. Attempting
to draw together or fix misalignment by tightening bolting may result in
cracking of the flange hub. Unnecessary overtightening will damage the
5.6 TORQUE TABLE
|Flange Size (inches)
Torque (FT. LBS)*
* THESE RECOMMENDATIONS ARE BASED ON THE USE OF FLAT
FLANGES, TWO STANDARD FLAT WASHERS, STANDARD NUT AND A 1/8" THICK, FULL
FACE NEOPRENE GASKET. LUBRICATE HARDWARE WELL, TIGHTEN IN THE PROPER PATTERN
AND APPLY TORQUE IN SMALL INCREMENTS.
5.7 If the flange is mated to a rigid and
stationary flanged object, or a metal flange, particularly in a buried
situation where settling could occur with the plastic pipe, the plastic
flange and the fitting or valve must be supported to eliminate potential