Page 17 - GRINNELL Mechanical Products Catalogue

GROOvED COupLiNGS
Rigid Connection
The Figure 772 Coupling has a patented design that grips the full 360° circumference of the pipe grooves . This design provides a more rigid and stronger connection through a range of pipe tolerances . The coupling design eliminates distortion of the gasket as the housing sections come together .
Trouble-Free Design
The patented universal tongue-and-groove design of the coupling housings assures trouble- free installation by avoiding the misalignment of the housings that could lead to a joint failure .
quick Installation
GRINNELL Figures 772 and 705 Couplings, in sizes up to 200mm (8"), feature a clamshell design that allows for an easy one-bolt installation, thus saving time during field installations .
MATERIAL SPECIFICATIoNS
Ductile Iron Housing Specifications
• ASTM A 536 – Standard specification for ductile iron castings, Grade 65-45-12
• Tensile strength, minimum 448,159 kPa (65,000 psi)
• Yield strength, minimum 310,264 kPa (45,000psi)
• Elongation in 50mm (2"), minimum 12%
• ASTM A 153 – Standard specification for hot-dip galvanising
Bolt/Nut Specifications
• Carbon steel oval neck bolts and nuts are heat-treated and conform to the physical properties of ASTM
A 183 with a minimum tensile strength of 758,422 kPa (110,000 psi) . Bolts and nuts are zinc electroplated to ASTM B 633 .
• Gold colour coded metric bolts conforming to the physical properties of ASTM F 568M are available upon request . Contact GRINNELL Mechanical Products .
• Stainless Steel nuts and bolts are UL Listed and comply with UL requirements . Bolts conform to ASTM A 193M, Class 2, Austenitic Stainless Steel . Nuts conform to ASTM A 194 Type 316, Grade 8M .
Coatings
• Orange – Non-lead paint (standard)
• Hot-Dipped, Zinc Galvanised (Optional)
Full contact between Figure 772 Coupling key and groove diameter
Additional Features:
• Two-piece, tongue-and-groove design allows for fast and easy installation
• Standard industry groove does not require special tools
• Backed by the industry’s best 10-Year Limited Warranty
Gasket Specifications
• Grade “E” EPDM gaskets have a green colour
code identification and conform to ASTM D 2000 for service temperatures from -34°C to 110°C (-30°F to 230°F) . They are recommended for hot water not to exceed 110°C (230°F), plus a variety of dilute acids, oil free air, and many chemical services . They are
not recommended for petroleum services . For low temperature and vacuum systems, a Tri-Seal Grade “E” EPDM gasket with a rigid coupling is recommended .
• Grade “T” Nitrile gaskets have an orange colour code identification and conform to ASTM D 2000 for service temperatures from -29°C to 82°C (-20°F to 180°F) . They are recommended for petroleum products, vegetable oils, mineral oils, and air with oil vapours .
• Grade “L” Silicone gaskets are red and conform to ASTM D 2000 for service temperatures from -34°C to 177°C (-30°F to 350°F) . They are recommended for air without hydrocarbons, or dry heat .
• Grade “O” Fluoroelastomer gaskets have a blue colour code and conform to ASTM D 2000 for service temperatures from -7°C to 149°C (+20°F to 300°F) . They are recommended for oxidising acids, petroleum products, hydraulic fluids, lubricants, and halogenated hyrdrocarbons .
• Grade “EN” NSF 61 approved gaskets have a copper colour code and are for potable water systems up to 82°C (180°F) . They are not recommended for petroleum service .
Refer to back cover for country-specific customer care numbers. 17
Grooved CouplinGs