Helical speed reducers H4 ways Material ropeways Toandfro system aeri H4-FV-24-D

Flender/Flender Gear Units/Helical speed reducers H4

lar corrosion test shall have to be 9 of 1 conducted as per following: - - ASTM 2 Practice with acceptance criteria of 6 mils / year (max.). OR - ASTM 2 practice with acceptance criteria of No cracks as observed from 2X magnification & Microscopic structure to be observed from 2X magnification. 1.2 When specifically asked for high temperat ure application of some grades of austenitic stainless steel (like SS 3, 3, 3, 3H etc.) ASTM 2 practice with acceptance criteria 1 MILS/YEAR shall ha ve to be conducted. When testing is conducted as per practice photograph of microscopic structure shall be submitted for record. 1.2 For the IGC test as described in 1.1.1 & 1.1.2 two sets of samples shall be drawn from each solution treatment lot, one set corresponding to highest carbon content and other set corresponding to the highest rating/ thickness. 2.0 OPERATION 2.1 Valves shall be supplied with gear operations based on the following requirements: Valve Types Class Size Requiring Gear Operation Gate & Diaphragm Valves 1 1 and larger 3 1 and larger 6 1 and larger 9 6 and larger 1 3 and larger 2 3 and larger Globe Valves 9 6 and lar ger 1 3 and larger 2 3 and larger 2.2 Gear operator shall be as under with position indicators for open / close positions, with limit stops. For Gate / Globe / Diaphragm Valves To tally enclosed bevel gear in grease case with grease nipples/ CHECK 2.3 Gear operators shall be so designed to operate effectively with the differential pressure across the closed valve equal to the cold non-shock pressure rating. 2.4 Hand wheel diameter shall not exceed 7 mm and effort to operate shall not exceed 3 kg at hand wheel periphery. In case these limits cannot be satisfied for any valve, gear operation shall be provided. 3.0 INSPECTION AND TESTING 3.1 All the mandatory shop tests and inspection required by he respective data sheet and applicable standards & codes etc. shall be