For use in the Denver Water Service Area |
Materials Specification – 28
for
Bolted Sleeve Type Couplings
1. General:
Pipe couplings shall be in accordance with AWWA C219 and shall be of a gasketed, sleeve type, with diameter to properly fit the pipe. Each coupling shall consist of one center sleeve, two end rings, two rubber-compounded wedge section gaskets and sufficient bolts to compress the gaskets.
The manufacturer of the coupling shall be experienced in their design and construction shall be regularly engaged in their manufacture and shall have produced couplings of the sizes specified herein which have given successful service for a period of at least 5 years.
2. Service:
Couplings will be installed on the following types of pipe: 1) Cast Iron, 2) Ductile Iron, 3) Asbestos-Cement, 4) Polyvinyl Chloride. The manufacturer shall state in writing that the coupling must be sufficient for the types of pipe being joined.
3. Material:
The couplings shall be manufactured from either cast iron or ductile iron and shall conform to applicable ASTM Designations. For cast iron ASTM A 48 or ASTM A 126, Class B. For ductile iron ASTM A 536, any malleable iron shall conform to ASTM A 47.
4. Gaskets:
The gaskets of the coupling shall be composed of a crude or synthetic rubber base compounded with other products to produce a material which will not deteriorate from age or heat or exposure to air under normal storage conditions. It shall also possess the quality of resilience and ability to resist cold flow of the material so that the joint will remain sealed and tight indefinitely when subjected to shock, vibration, pulsation and temperature or adjustments of the pipeline.
5. Bolts:
Bolts and heavy hex nuts shall be stainless steel, US alloy, Dresserloy, Cor Ten or an approved equal.
The manufacturer shall supply information as to the recommended torque to which the bolts shall be tightened.
6. Acceptable Manufacturers:
| Smith-Blair | Model 411 |
| Dresser | Model 138-38 |
| Romac | Model 501 |
| Ford | Style FC1 |
| Baker | Series 228 |
| Power Seal | Model 3506 |