This specification describes the minimum requirements for piping systems for the following service:

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1 201/01/13 1/ 1.0 APPLICATION This specification describes the minimum requirements for piping systems for the following service: Service Air Design Conditions Operating Conditions Blast Air (see Note 1) Design Conditions Operating Conditions º F to 180º F º F º F to 180º F 15 Ambient Temperature Design, Fabrication, Installation, Approval Requirements ASME B31.1 SPEC SPEC Power Piping Piping Classification and Identification Identify and paint the piping system according to the requirements indicated on the project drawings or the scope of work. Piping General Requirements SPEC Quality Requirements Piping systems are subject to the approval of TSSA, Boilers and Pressure System Approvals Vessels Safety Division. Note 1: This specification can also be used for Smelter Blast Air Piping up to 30 inches in diameter. It operates below 15 PSIG at ambient temperature. The blast air system originates from the #1 Powerhouse & #2 Powerhouse to the converters and to Matte Processing. 2.0 MATERIALS 2" & Smaller Schedule 80 per ASME B36.10, carbon steel ASTM A53 Gr. B or ASTM A106 Gr. B, ERW or seamless, T & C ends. Pipe 2 ½ " through 10" Schedule 40 per ASME B36.10, carbon steel ASTM A53 Gr. B or ASTM A106 Gr. B, ERW or seamless, beveled ends. 12" through 24" 0.35" thick wall per ASME B36.10, carbon steel ASTM A53 Gr. B or ASTM A106 Gr. B, ERW or seamless, beveled ends. 26" through 30" 0.35 thick wall thickness, spiral weld, ASTM A139 Gr C or D, beveled ends, AWWA C2000

2 201/01/13 2/ 2" & Smaller Class 150 malleable iron per ASME B16.3, ASTM A19, screwed and banded. (see note 2) or Class 3000 per ASME B16.11 Forged carbon steel ASTM A105, screwed and banded (see note 2) Fittings 2 ½ " through 10" Schedule 40 per ASME B16.9, carbon steel ASTM A234 Grade WPB, butt weld. (see note 3) 12" & Above 0.35" thick wall per ASME B16.9, carbon steel ASTM A234 WPB, butt weld. (see note 3) Note 2: For piping 2 and smaller in inaccessible or concealed locations, the piping shall be socket welded construction. Note 3: Butt weld elbows - Long radius R= 1 1/2 x dia. unless otherwise noted. Threaded and socket weld half couplings, Class 3000 per ASME B16.11, forged carbon steel ASTM A105. Branch Connections Thredolet and sockolet, Class 3000 per ASME B16.11 and MSS SP-9, forged carbon steel ASTM A105. Weldolet, Extra strong per ASME B16.11 and MSS SP-9, forged carbon steel ASTM A105. Attachment to run pipe by full penetration welds. For connection type, see Appendix A Branch Connections Class 150 per ASME B16.5, threaded type, raised face, forged carbon steel ASTM A105. Use flanges 2" and below only for connections to flanged equipment. Flanges 2 ½ " through 24" Class 150 per ASME B16.5, slip-on or welding neck type, raised face, forged carbon steel ASTM A105. Bore of welding neck flanges to suit pipe ID. 26 through 30 Class 150 per ASME B16.4, welding neck type, raised face, forged carbon steel to ASTM A105. Bore of welding neck to suit pipe ID.

3 201/01/13 3/ Flanges (cont d) Threaded Joint Sealant Flanged Joint Gaskets Flange Bolting Unions Check Valves Butterfly Valves Note: Flat faced flanges required at all cast iron components. Use Teflon Tape or Teflon based thread sealing compound in paste form 1/16" thick ring type - inside bolts, non-asbestos, synthetic fibre, nitrile bonding. Dimensions to ASME B Gasket dope is not permitted. Blue-Gard, Style 3000 by Garlock Klinger sill, C-4433 NST by Robco Durlon, Style 8500 by Durabla or equal Plant Air Carbon steel bolts to ASTM A30 Gr. B, UNC-2A threads, with heavy series hex nuts to ASTM A563 Gr. A, UNC -2B. Dimensions to ASME B1.1, B and ASME B Blast Air Bolts: ASTM A193 Grade B, ASME B1.1, ASME B18.2.1, UNC Class 2A. Nuts: ASTM A194 Grade 2H, ASME B1.1, ASME B18.2.2, UNC Class 2B Class 150 per ASME B16.39, malleable iron union ASTM A19, brass to brass seats, ground joint, threaded ends to ASME B Class 125 bronze swing check ASTM B61 or B62, integral seat, bronze disc, screwed or union cap, threaded per ASME B ½ & Above ASME B16.1 Class 125 ductile iron or cast iron body silent wafer style nonslam, disk check valve, bronze disc, Buna N seat, Inconel X or 316SS spring 2 ½ " through 6" Class 125 cast iron body wafer style butterfly valve, 316 stainless steel shaft and disc, Buna N seat, lever operated, for mounting between 150 lb. ASME flanges, rated 200 PSIG minimum differentials in closed position, face to face dimensions in accordance with MSS SP-6. Valves to be lockable 8" & Above Class 125 cast iron body wafer style butterfly valve, 316 stainless steel shaft and disc, Buna N seat, gear operated, for mounting between 150 lb. ASME flanges rated 150 PSIG minimum differential in closed position, face to face dimensions in accordance with MSS SP-6. Valves to be lockable Notes: 1. Lug style butterfly valves with tapped holes to be used in dead end service or where line blinds are used for maintenance purposes 2. Quarter turn valves 6 and over must be equipped with gear operators

4 201/01/13 4/ Ball Valves Instrument Isolation Valves Blast Air Valves Safety Relief Valves Pressure Reducing Valves Drain Traps Strainers Class 600 minimum rating brass body and ball, stainless steel or brass stem, teflon seats, reinforced teflon seals, lockable lever handle, threaded ends to ASME B Valves to be lockable ½ " ball valve, class 600 minimum rating brass body and ball, stainless steel or brass stem, teflon seats, reinforced teflon seals, lockable lever handle, threaded ends to ASME B Valves to be lockable. Selection by Engineer Selection by Engineer Selection by Engineer Ball float type, liquid drain trap, cast iron body and stainless steel float, rated 150 psig min. or Automatic drain valve, 110 volts, 60 cycle, single phase c/w adjustable on/off timer. Class 250 iron body Y-Type strainer, screwed cap complete with blow-off connection and plug, 1/32" perforated stainless steel screen, threaded ends to ASME B ½ " & Above Class 150 cast steel body Y-Type strainer, bolted cover complete with blowoff connection and plug, 3/64" or 1/8 perforated stainless steel screen, flanged ends to ASME B TESTING Testing must be the requirements of ASME B31.1 and PROC (hydrostatic testing) or SPEC (pneumatic testing only at the discretion of the Engineer) and specific instructions in the scope of work. Fluid Test Pressure Duration Additional Requirements Service Air 225 PSIG Per Code hydrostatic testing Blast Air Recommend hydrostatic shop testing & Per Code Per Code pneumatic field testing. 4.0 EXAMINATION AND INSPECTION Examination and inspection must meet the requirements of ASME B31.1 and specific instructions in the scope of work. 100% visual examination for all sizes and thicknesses is required.

5 201/01/13 5/ 5.0 CLEANING When all liquid has been drained from the line, including all pockets or low points, connect the line to the outlet of the instrument air compressor, with air dryers by-passed, and blowout the line with instrument air. Vent the discharge at a location where no possibility of hazard to personnel exists. Continue this process until air discharging from the line contains no more moisture than at the compressor discharge. Blow-out the lines in sequence from the largest to the smallest. 6.0 APPENDICES Appendix A: Branch Connections

6 201/01/13 6/.0 REVISION AND TRANSITION NOTES Revision notes describe: what was changed, and if applicable, why it was changed, and the plan to implement the change, including whether changes are retroactive. Note: The revision notes are a summary of the changes and may not necessarily be a complete list. A risk code is entered for each revision and if applicable, the revision notes will describe how risk was addressed for the revision. Risk Code A Risk Category This revision is a minor change and/or introduces no risk. B C Risk has been addressed for this revision by the reviewer and approver. Low risk or no new hazards identified. For this revision, a PHR or other risk management tool has been used to address risk and minimize hazards. This risk assessment has been documented and is available through Central Engineering. Rev Revision Notes Risk Code Approved by Reviewed by Issue Date YYYY/MM/DD Specification updated and format and number revised. Previous number Rev Approved for use in Thompson Piping system Approval Requirements for MB updated Reference to SPEC corrected in Reference document section. - No technical changes. --- BL AR 2012/04/ BL AR 2012/10/ BL AD 2012/11/23 4 Section 1: This SPEC now applicable to Blast Air as well Section 2: Added temperature range to design and operating conditions, and blast air design and operating conditions - Section 3: Added table, added SPEC and PROC reference. Section 8: Added some reference codes and/or standards that were omitted. Changes are applicable to new installations or modifications to existing systems from this date forward --- MF MF 2016/05/18 5 Check valve material options added --- MF MF 2016/05/18 6 Blast air section updated to include diameters up to 30 : pipe materials, flanges, fasteners, valves, testing, and branch connection information modified. Class 3000 fittings replace Class 2000 fittings due to limited availability. SPEC format updated A P.Belzile K.L.Robin 2016/09/12 A M.Fogarty A.Delost 201/01/13

7 201/01/13 / APPENDIX A: BRANCH CONNECTIONS Inches B R A N C H /4 NA NA NA NA /2 NA NA NA NA Inches /4 1/2 HEADER 1 = Equal Tee 2 = Reducing Tee or Straight Tee with Reducer 3 = Half Coupling (Threaded or socket weld) 4 = Thredolet, Sockolet 5 = Weldolet NA = Not Advised

This specification describes the minimum requirements for piping systems for the following service:

SPEC-3501 1/ 1.0 APPLICATION This specification describes the minimum requirements for piping systems for the following service: Instrument Air Design Conditions 150 PSIG @ 180 F Operating Conditions 125