The Shurjoint Model R20 Butt-Joint Rigid Coupling is a truly rigid grooved pipe coupling which, unlike other grooved couplings, does not allow for any axial movement, angular movement and or rotational movement under normal service conditions. The butt-joint design (patented in Japan) eliminates the gap in between pipe ends to eliminate linear movement which previously had been considered a given in grooved piping systems. Support and hanging requirements correspond to ANSI B31.1, B31.9 and NFPA 13.

The fluid will neither directly contact the rubber gasket nor stay in the gasket pocket as often seen in conventional grooved pipe couplings. No rubber ingredients will leach out into the fluid.

The T&G (tongue & groove) device supported by the Shurjoint precise casting technique provides a metal-to-metal contact of the bolt pads when properly installed. No torque wrench is required for installation.

No special changes are required when processing roll-grooves on the pipe. Standard roll grooves can receive the Model R20 coupling.

Applications:

All piping including mechanical rooms where no angular and axial movement are desired.

Dry-system fire protection pipelines.

Stainless steel piping for potable water and food industries (epoxy coated housings with NSF61 certified gasket and type 316 bolts and silicone bronze nuts).

Hot water systems.

Caution: Pipe end shall be cut square so that pipe ends come to butt together.

For Fire Protection pressure rating, listing, and approval information, refer to Data Sheet B-42 or visit SHURJOINT website, www.shurjoint.com for details or contact your SHURJOINT Representative.

MODEL R20 MATERIAL SPECIFICATIONS

• Housing:

Ductile Iron to ASTM A536, Gr. 65-45-12 and or ASTM A395, Gr. 65-45-15, min. tensile strength 65,000 psi (448 MPa).

(Option) Gr. E-pw EPDM (potable water use), NSF61 certified.

• Surface Finish:

Standard painted finishes in orange or RAL3000 red.

Hot dip zinc galvanized (Option).

Epoxy Coatings in RAL3000 red or other colors (Option)

•Rubber Gasket:

GapSeal gasket, Grade “E” EPDM (Color code: Green stripe) Recommended for cold and hot water service within the specified temperature range, plus a variety of dilute acids, alkalis, salts, oil-free and many chemical services not involving hydrocarbons,

oils and gases.

Do not use for HYDROCARBONS and PETROLEUM service.

Temperature range: -29 oF to +230 oF (-34 oC to +110 oC)*. For water services of constant high temperature greater than +185 oF (+85 oC) contact Shurjoint for gasket recommendation.

*EPDM gaskets for water services are not recommended for steam services unless couplings or components are accessible for frequent gasket replacement.

General Notes:

(Option) Grade “T” Nitrile (Color code: Orange stripe) Recommended for petroleum products, air with oil vapors, vegetable and mineral oils within the specified temperature range. Also good for water services under +150oF (+66oC).

Temperature range: -20 oF to +180 oF (-29 oC to +82 oC).

Do not use for HOT WATER above +150 oF (+66 oC) or HOT DRY AIR above +140 oF (+60 oC).

Other options: Grade “O” - Fluoroelastomer.

Grade “L” - Silicone.

For additional details contact Shurjoint.

• Bolts & Nuts:

Heat treated carbon manganese steel track bolts to ASTM A449-83a (or A183 Gr. 2), minimum tensile strength 110,000 psi (758 MPa), Zinc electroplated, with heavy-duty hexagonal nuts to ASTM A563.

Stainless steel type 316 track bolts with silicone bronze nuts