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| A. Manufacturer |
| Contractor shall furnish and install new, long coupled in-line pumps for chilled water and hot water
heating systems as indicated on the drawings. Pumps shall be Series 60 as manufactured by Bell & Gossett under base bid. Alternatives may be submitted as deduct alternates. Pumps shall meet types, sizes, capacities and characteristics as scheduled on the Equipment Schedule drawings. |
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| B. Long Couple In-Line Pump |
| 1. |
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The pumps shall be horizontal, permanently lubricated, specifically designed and guaranteed for quiet operation. Suitable for 225°F (107°C) operation at 175 psig (12 bar) working pressure. The pump shall be single stage, vertical split-case design, in cast iron, bronze fitted (or all bronze) construction. The pump internals shall be capable of being serviced without disturbing piping connections. |
| 2. |
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The pump shall be composed
of three separable components:
a motor, bearing assembly and pump end (wet end). The motor shaft shall be connected to the pump shaft via a replaceable flexible coupler. |
| 3. |
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The pumps shall have a solid
SAF 1144 steel shaft supported by two sealed ball bearings.
A non-ferrous shaft sleeve shall
be employed to completely cover the wetted area under the seal. |
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| 4. |
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Pump shall be equipped with an internally flushed mechanical seal assembly. Seal assembly shall have a brass housing, Buna bellows and seat gasket, stainless steel spring,
and be of a carbon/ceramic design
with the carbon face rotating against a stationary ceramic face. |
| 5. |
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Bearing assembly shaft shall connect
to a cast bronze impeller. Impeller shall be both hydraulically and dynamically balanced, keyed to the shaft and secured by a nut and lock washer. |
| 6. |
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A flexible-type coupling shall be employed between the pump and motor. |
| 7. |
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Pump should be designed to allow for true back pull-out access to the pump's working components for ease of maintenance. |
| 8. |
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Pump volute shall be of cast iron design for heating systems or cast bronze for domestic water systems. The connection style on cast iron
and bronze pumps shall be flanged. Volute shall include gauge ports at nozzles, and vent and drain ports. |
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| 9. |
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Motors shall meet scheduled horsepower, speed, voltage and enclosure design. Bell & Gossett motors through 1 HP (.75kw) shall
be resilient mounted; Bell & Gossett motors over 1 HP (.75 kw) shall be rigid mounted. Motors shall have permanently lubricated ball bearings and must be completely maintenance free. Motors shall meet NEMA specifications. |
| 10. |
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Pump shall be of a maintainable design and for ease of maintenance should use machine fit parts, not press fit components. |
| 11. |
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Pump manufacturer shall be ISO-9001 certified. Pump shall be of U.S. manufacturer. |
| 12. |
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Each pump shall be factory tested and name-plated before shipment. |
| 14. |
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Pump shall have a three (3) year warranty from date of manufacture. |
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| C. Accessories |
| Where noted on schedule, an EPT high pH (7-11) seal should be used
in lieu of the Buna standard pH (7-9) seal. EPT seals are applicable on systems with up to 250°F (121°C) maximum water temperatures.
In addition, Viton seals are available as required. |
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