Notes Graphite packing shall be pure graphite (99.8% min) with corrosion inhibitor Valves shall be supplied with locking facility in fully Open / Closed position Valves shall be supplied with SS Tag plate as per MSS-SP-25. Stainless Steel tag showing valve Tag-No. shall be permanently attached to the valve body. Vendor to confirm compliance to NACE MR0175/ISO 15156 requirements Valve gasket seating surface area shall not contain any disruptions (screw holes or retainer edge) within the effective sealing area of an ASME B16.20 spiral wound gasket. Valves to be provided with pads and holes to enable locking on open and closed position. Position indicator shall be provided in the valve. Valve packing shall be non-asbestos material and fire safe.The packing shall contain a corrosion inhibitor to prevent valve stem pitting. Valves shall be suitable for full vacuum condition.