procurement of vacuum pump 1st stage impeller , vacuum pump 1st stage impeller (as per drawing) technical specifications 1. dimension: as per drawing 2. out diameter: 520 mm 3. inner diameter: 135 mm 4. length of impeller: 550 mm 5. no. of blades: 15 6. material: stainless steel 304 7. the offered impeller shall be confirming to the above technical specifications and shall exactly match with the existing size, profile and suitable for the existing edwards shr21850 model vacuum pump. 8. the drawing enclosed is not scale and not a production drawing which is just for reference only, the bidder should inspect the existing indented material in services at site before quoting the tender and all the technical clarification to be completed before quoting the tender.