Smith-Blair · Repair Clamp
Style 256 Full Circle Repair Clamp
All Stainless Steel, Cast Lugs, Single Band
300 PSI Max Working Pressure
-20°F to +180°F Temperature
Nitrile (Buna-N) Gasket
All 304 Stainless Steel
Cast Stainless Lugs
NSF/ANSI 61 and 372
2.35-14.40 in Pipe OD
7-48 lb Weight
Description
The Smith-Blair Style 256 is an all-stainless, single-band Full Circle repair clamp for hot soils and other aggressive environments. A 360° Nitrile gasket gives complete leak repair, cast stainless lugs and stainless bolts leave no welded parts, and the lugs remove for installation in tight places.
Application: hot soils and other aggressive environments, on cast iron, ductile iron, asbestos cement, PVC, HDPE, steel, copper, fiberglass and other pipe types.
Key Features
- Working pressure up to 300 PSI
- All stainless with no welded parts — built for hot soils
- Up to 0.40 in of OD range in the single band
- Widths 7.5, 15 and 22.5 in; removable lugs and drop-in bolts
- Certified to NSF/ANSI 61 and NSF/ANSI 372
What Ships and What It Needs to Run
Included: the clamp with its Nitrile gasket, lugs, bolts and nuts, ready to install.
Belleville spring washers on HDPE pipe, ordered separately. Smith-Blair p/n 150115-000 washers are required on HDPE pipe DR17 or thicker; Smith-Blair does not recommend the clamp on thinner-wall HDPE (not for gas service); ask us to include them with the clamp.
Genuine Smith-Blair equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
12-Month Smith-Blair Warranty
Smith-Blair warrants its products to be free of defects in materials and workmanship for one year from the date of shipment by Smith-Blair. Dated proof of purchase, such as a bill of sale, is required to establish eligibility. Smith-Blair will repair or, at its option, replace a defective product; the product is returned to the factory or warehouse Smith-Blair designates.
Working Pressure
Up to 300 PSI. Smith-Blair rates the allowable working pressure of a repair clamp to fall as pipe diameter rises; for a particular installation it is set by pipe size and type, the type and extent of the damage, service conditions and installation workmanship.
Materials Specifications
| Band |
Type 304 stainless steel |
| Lugs |
CF8 austenitic cast stainless steel (304 equivalent) |
| Gasket |
Nitrile (Buna-N), resists water, acids, alkalies, most aliphatic hydrocarbons and other chemicals |
| Bridge plate |
Type 304 stainless steel, recessed flush and bonded to the gasket |
| Bolts |
Type 304 stainless steel with rolled threads, fluoropolymer coated to prevent galling |
| Temperature range |
-20°F to +180°F |
Materials subject to change by the manufacturer.
Pipe Applications
Cast iron, ductile iron, asbestos cement, PVC, HDPE DR17 or thicker (with spring washers), steel, copper, fiberglass and other pipe types.
Sizes
26 pipe sizes from 2.35 to 14.40 in OD — open for the full list
| Pipe size and OD |
Widths |
| 2 in - 2.35-2.63 in |
7.5, 15 in |
| 2-1/4 to 2-1/2 in - 2.70-3.00 in |
7.5, 15 in |
| 3 in - 2.97-3.25 in |
7.5, 15 in |
| 3 in - 3.46-3.70 in |
7.5, 15 in |
| 3 to 4 in - 3.73-4.00 in |
7.5, 15 in |
| 4 in - 3.96-4.25 in |
7.5, 15 in |
| 4 in - 4.45-4.73 in |
7.5, 15 in |
| 4 in - 4.74-5.14 in |
7.5, 15, 22.5 in |
| 4 to 5 in - 4.95-5.35 in |
7.5, 15, 22.5 in |
| 4 to 5 in - 5.22-5.62 in |
7.5, 15, 22.5 in |
| 6 in - 6.56-6.96 in |
7.5, 15, 22.5 in |
| 6 in - 6.84-7.24 in |
7.5, 15, 22.5, 30 in |
| 6 in - 7.05-7.45 in |
7.5, 15, 22.5 in |
| 6 in - 7.45-7.85 in |
7.5, 15, 22.5 in |
| 8 in - 8.54-8.94 in |
7.5, 15, 22.5 in |
| 8 in - 8.99-9.39 in |
7.5, 15, 22.5 in |
| 8 in - 9.27-9.67 in |
7.5, 15, 22.5 in |
| 10 in - 10.64-11.04 in |
7.5, 15, 22.5 in |
| 10 in - 11.04-11.44 in |
7.5, 15, 22.5 in |
| 10 in - 11.34-11.74 in |
7.5, 15, 22.5 in |
| 10 in - 11.75-12.15 in |
7.5, 15, 22.5 in |
| 12 in - 12.62-13.02 in |
7.5, 15, 22.5 in |
| 12 in - 13.10-13.50 in |
7.5, 15, 22.5 in |
| 12 in - 13.40-13.80 in |
7.5, 15, 22.5 in |
| 12 in - 13.70-14.10 in |
7.5, 15, 22.5 in |
| 12 in - 14.00-14.40 in |
7.5, 15, 22.5 in |
Choose the pipe OD in the first row above; the part number shows in the second row.
Installation Notes
- Clean the pipe where the clamp will sit, removing scale, dirt and debris that could spoil the gasket seal.
- Lubricate the pipe and gasket with a soap-and-water solution that meets the water and pipe supplier’s requirements.
- Where the pipe ends gap 1 in or more, bridge the gap with a short section of pipe or a thin strip of sheet metal to support the gasket.
- Where 40% or more of the circumference is broken away, cover the opening with sheet metal and use a clamp that extends 3 in past it on both sides.
- Engage the centermost bolts first and tighten from the center outward, keeping the clamp centered on the break; finish with a calibrated torque wrench to the torque in the instructions.
- Anchor the pipe: the clamp seals around it, and Smith-Blair requires proper anchoring to restrain pipe movement and prevent pull-out.
From Smith-Blair Installation Instructions TI-002 (Rev 08/26/21), in the Data Sheet tab.
Before You OrderAll Smith-Blair products are Made to Order and Non-Returnable.
Items typically shipped in 5 - 10 business days.
Odd pipe ODs, other widths and other materials are built to order — email sales@watermainsupply.com with the pipe OD and material.
