Selecting and Measuring Expansion Joints
For information about selecting pipe size, see Selecting and Measuring Pipe & Fittings.
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Expansion Joints with Flanged Ends for Drinking Water
- For Use With: Drinking Water
- Temperature Range: -20° to 250° F
- Maximum Pressure: See table
- Maximum Vacuum: 26in. of Hg @ 72° F
- Specifications Met: NSF/ANSI 61
The EPDM lining in these joints meets NSF/ANSI 61 standard for use with drinking water. To reduce stress, vibration, and noise in piping systems, they provide a point of flexibility to absorb movement. These joints have a flexible body reinforced with polyester cord for added strength. A zinc-plated steel plate supports each flange. The flanges mate with the same-size flat-surface Class 150 flange without the need for a gasket.
Position the expansion joints as close as possible to anchor points. Attach limit rod sets (sold separately) to the flanges to prevent overextension where anchoring is insufficient. To accommodate the thickness of the limit rod mounting plate, use bolts that are 7/8" longer than the bolts connecting the expansion joint to the pipe flange. Each set of limit rods requires eight bolts (not included).
Expansion Joints | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Distance | Limit Rod Sets | |||||||||||||
| Flange OD | Pipe Size  | Lg. | No. of Bolt Holes | Compression | Expansion | Offset | Max. Pressure | Expansion Joint Type | Flange Material | Bolt Hole Size | Each | Pair | ||
EPDM Rubber with EPDM Rubber Liner | ||||||||||||||
| 5" | 1 1/2 | 6" | 4 | 3/4" | 3/8" | 1/2" | 200 psi @ 72° F | Single Bulb | Zinc-Plated Steel | 5/8" | 0000000 | 0000000 | 0000000 | 0000000 |
| 6" | 2 | 6" | 4 | 1 3/8" | 3/4" | 5/8" | 200 psi @ 72° F | Single Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 7" | 2 1/2 | 6" | 4 | 1 3/8" | 3/4" | 5/8" | 200 psi @ 72° F | Single Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 7 1/2" | 3 | 6" | 4 | 1 3/8" | 3/4" | 5/8" | 200 psi @ 72° F | Single Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 9" | 4 | 6" | 8 | 1 3/8" | 3/4" | 5/8" | 200 psi @ 72° F | Single Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 11" | 6 | 6" | 8 | 1 5/8" | 3/4" | 3/4" | 190 psi @ 72° F | Single Bulb | Zinc-Plated Steel | 7/8" | 0000000 | 00000000 | 0000000 | 000000 |
| 13 1/2" | 8 | 6" | 8 | 1 5/8" | 3/4" | 3/4" | 190 psi @ 72° F | Single Bulb | Zinc-Plated Steel | 7/8" | 0000000 | 00000000 | 0000000 | 000000 |