Shell and tube heat exchangers

PART 1 - GENERAL

1.01            RELATED DOCUMENTS

A.       Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

B.       Specifications throughout all Divisions of the Project Manual are directly applicable to this Section, and this Section is directly applicable to them. 

1.02            SUMMARY

A.       Perform all Work required to provide and install shell and tube type heat exchangers, accessories and trim indicated by the Contract Documents with supplementary items necessary for proper installation and operation.

1.03            REFERENCE STANDARDS

A.       The latest published edition of a reference shall be applicable to this Project unless identified by a specific edition date.

B.       All reference amendments adopted prior to the effective date of this Contract shall be applicable to this Project.

C.       All materials, installation and workmanship shall comply with the applicable requirements and standards addressed within all references.

1.04            QUALITY ASSURANCE

A.       Conform to ANSI/ASME Boilers and Pressure Vessels Code Section VIII, Division 1 for design and fabrication of pressure vessels for manufacture of tubular heat exchangers and heat exchanger shells.

1.05            SUBMITTALS

A.       Product Data and Record Documents:

1.       Submit Shop Drawings and product data, including dimensions, piping arrangement, and supports.

2.       Submit manufacturer’s installation instructions.

3.       Submit test reports of tube bundle pressure tests.

B.       Operation and Maintenance Data:

1.       At Substantial Completion, submit operation and maintenance data that includes Start-up and shutdown instructions, assembly Drawings, and spare parts lists.

1.06            DELIVERY, STORAGE and HANDLING

A.       Deliver, store, protect and handle products to the Project Site under provisions of Division 01 and Division 20.

B.       Protect internals from entry of foreign material by temporary caps on flanged openings

PART 2 - PRODUCTS

2.01            GENERAL

A.       All materials shall meet or exceed all applicable referenced standards, federal, state and local requirements, and conform to codes and ordinances of authorities having jurisdiction.

2.02       MANUFACTURERS

A.       American Standard.

B.       ITT Bell & Gossett.

C.       Taco.

2.03            STEAM - LIQUID HEAT EXCHANGERS 

A.       Provide shell and tube type heat exchangers with removable U-bend tube bundle, steam in shell, water in tubes, with capacity scheduled on the Drawings.

B.       Construct in conformance with ASME code for unfired pressure vessels for 100 psi minimum steam pressure and 300 psi water pressure. Certify by an authorized inspector holding a national board of boiler and pressure vessel inspector’s commission.

C.       Shell: 

1.       Steel with threaded (2-1/2 inches and smaller) or flanged (3 inches and larger) pipe connections, steel mounting saddle. 

2.       Muntz metal or other approved corrosion resistant tube sheets and tube supports.

D.      Heads:  Cast iron or steel.

E.       Tubes:  U-tube, ¾ inch minimum outside diameter seamless Type K copper, removable for inspection and cleaning.

F.       Trim:

1.       Shell:  Pressure gauge tapping with pigtail siphon, vacuum breaker.

2.       Water inlet:  Thermometer well, pressure gauge tapping, valved drain.

3.       Water outlet:  Thermometer well for temperature regulator sensor, ASME rated pressure and temperature relief valve, thermometer well, pressure gauge tapping.

2.04            LIQUID – LIQUID HEAT EXCHANGERS

A.       Provide shell and tube type heat exchanger with removable U-bend tube bundle, heated water in shell, primary water in tubes, with capacity and passes scheduled on the Drawings.

B.       Construct in conformance with ASME Code for Unfired Pressure Vessels for 300 psi water pressure, and certify by an authorized inspector holding a National Board of Boiler and Pressure Vessel inspectors commission.              

C.       Shell: 

1.       Steel with threaded (2-1/2 inches and smaller) or flanged (3 inches and larger) pipe connections, steel mounting saddle.

2.       Muntz metal or other approved corrosion resistant tube sheets and tube supports.

D.      Heads:  Cast iron or steel.

E.       Tubes:  U-tube type, ¾ inch minimum outside diameter seamless Type K copper, removable for inspection and cleaning.

F.       Trim:             

1.       Water inlets and outlets:  Thermometer wells, pressure gauge tappings.

2.       Heater water outlet:  Thermometer well for temperature regulator sensor, ASME rated pressure and temperature relief valve, valved drain.

PART 3 - EXECUTION

3.01            INSTALLATION

A.       Installation shall meet or exceed all applicable federal, state and local requirements, referenced standards and conform to codes and ordinances of authorities having jurisdiction.

B.       All installation shall be in accordance with manufacturer’s published recommendations.

C.       Install to permit removal of tube bundle with minimum disturbance to installed equipment and piping.

D.      Support heat exchangers on welded steel pipe and angle floor stand.

E.       Pitch shell to completely drain condensate.

F.       Pipe relief valves and drain valves to nearest floor drain.

G.       Provide a minimum of two (2) steam traps in parallel or as detailed on Drawings.

H.      Install dielectric fittings where ferrous metal and non-ferrous metal are in contact.