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971 Series - Fisher Regulators (389 words) |
 | The 971 Series is a 10-inch (DN 250) top-entry, pilot-operated pressure reducing regulator that uses the combination of the PRX Series and Type SA/2 pilot supply regulator as its piloting system to give a operating pressure range of 7.3 to 1015 psig (0,5 to 70 bar). |
| Type 971 is always used as the working regulator in single-stage pressure reduction applications and in up or downstream wide-open monitor systems. |
| Optional Aromatic Hydrocarbon Construction: The 971 Series is available with fluoroelastomer seat, O-rings and a specially designed diaphragm that has a PVC coating, which extends the operational life of the regulator in applications where aromatics are entrained in the gas. |
| Akula Class / Bars-class / Project 971 (2172 words) |
| The Project 971, using a steel hull, was initiated in 1976 when it became evident that existing industrial infrastructure was inadequate to mass produce the expensive titanium hulls of the Project 945 Sierra class. |
| The performance of the Project 971 boats was a close approximation to that of the Project 945 design, though the later was significantly more expensive to build and maintain. |
| The Project 971 is said by Russian sources to be at a distinct disadvantage in sensors, with a sonar suite that is roughly one-third as sensitive as the Los Angeles, able to track only two targets simultaneously (as opposed to the multiple target tracking capabilities of the American system). |
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