Quote Request |
| 02-08 04:57:06 来源： 作者： |
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Quote Request Inquiry (采购产品): Quote Request Equipment Specification Heat Exchanger Specifications EPDM solution in Hexane 12/03/08 1.4.3 – Preheater 2 Coil Tube Heat Exchanger with Accessories Scope: Supplier is to quote a coil tube heat exchanger in a shell with steam on the shell side.The preheater consists of approximately 6 m of 316 SS 1/2” OD tube coiled in a shell. This preheater is also heated with steam. . Normal Operating Conditions Performance of the preheater will provide additional heat for vaporization of hexane using 3.0 MPa, 230 C, high pressure steam regulated to provide the desired vaporization performance. The solution is allowed to expand to a pressure of as low as 0.7-.2 MPa into this second heat exchanger. Type: Coil tube heat exchanger Technical Design Side Specification: Process Fluid: 7-12 % EPDM rubber solution in hexane. Heat Transfer Area approx. 0.24 m2 Total heat Duty projected: 13,000 kcal/hr. Inlet temperature: 180 – 210 C Discharge Temperature: 210 – 220 C Inlet Viscosity: 1000 – 8000 cp Outlet Viscosity: 1000 – 8000 cp Min / Max MPa…………………………….4 MPa Heating Medium: 3.0 MPa steam Heat Exchnager Pressure rating: 6.9 MPa at 230 C Materials: shell 316 SS/ tube 316 SS Connections: 316 SS ANSI RF flanges are required. Technical Process Side Specification: Pressure Vessels and Heat Exchangers All codes and standards shall be of the latest edition at the contract effective date. (1) Applicable code and standard The Codes and standards applicable to the equipment design shall be applied for the design, manufacture, inspection, and test etc. of pressure vessels and heat exchangers as minimum requirement. (See Annex 3, Chapter 3.8 Codes and Standards) If more strict requirements by LICENSOR are existing they have to be considered. (a) N/A (b) ASME Code Section VIII, Div.1 - Test and inspection reports shall be prepared in the ASME form or equivalent form. Analysis for cyclic operation will be in accordance with ASME Code Section VIII Div. 2 or equivalent, if necessary. ASME stamping is not required. (c) Materials specification - Materials to be used for pressure parts of vessels and heat exchangers shall conform to ASME Code Section II and to ASTM specifications or equivalent. (d) ASME Code Section V-including Addenda - Non-destructive examination for pressure vessels shall conform to this code or equivalent. (e) ASME Code Section IX-including Addenda - Welding for pressure vessels shall conform to the requirements of this code or equivalent. (f) ANSI B 16.5 “Steel Pipe Flanges, Flanged Valves and Fittings” and equivalent. - This standard shall apply to nozzles and man hole flanges 24” and under in nominal size. - b) Flanges larger than nominal size of 24” shall be as per ASME B16.47 Series B and calculated for strength as per the ASME Code Section VIII, Div.1, Appendix 2. (g) TEMA - The structural design of shell and tube type heat exchangers shall be in accordance with Class R of this standard. - Calculation of tube sheet shall be in accordance with TEMA. (h) Heat Exchangers other than those of shell and tube type can be designed and fabricated according to manufacturer’s standards. (2) Design pressure and temperature Design pressure and design temperature shall be in accordance with the data sheets issued by process owner. If not specified in the data sheets issued by process owner, the design pressure and temperature shall be taken in accordance with ASME based on the highest pressure and temperature as well as lowest temperature during operation. (3) Combined stress calculation Combined stress calculations for vertical vessels shall consider the hydrostatic test condition after installation at the job site. However, the seismic load shall not be considered for design of vertical vessels during hydrostatic test at the plant site. (4) Corrosion allowance The corrosion allowance of pressure parts for vessels shall be in accordance with instruction given in data sheet issued by process owner, but not less than 1.0 mm. For those not specified in the data sheet, the following corrosion allowance shall be provided. - Carbon steel and low alloy steel (5 Cr or less): Min. 1.5 mm - High alloy steel except ferrite stainless steel (9 Cr and higher) and non-ferrous: 0 mm The corrosion allowance for carbon steel equipment's which contact with the circulating cooling water is 3 mm min. Lining materials such as cladding or weld deposit overlay for lined equipment with the thickness of 1 mm or more shall be regarded as corrosion allowance, and they shall be excluded in the strength calculation. Internal Component (excluding tray): - The corrosion allowance of internals to be made to either carbon steel or low alloy steel for pressure vessels other than those shown in (d) below will be as follows: - Internal components directly welded to the vessel shell: Same corrosion allowance as that of vessel shell for each surface of internals. - Internal components to be bolted or clamped to the vessel: One half corrosion allowance as that of vessel shell for each surface of internals. - Shell and tube type heat exchangers shall be provided with corrosion allowance in accordance with the data sheet of process owner but not less than TEMA “R” requirement. - No corrosion allowance will be provided for internals of high alloy steel except for ferrite stainless steel (9 Cr or higher) and nonferrous materials. Trays, bolting or clamping assembly type: One quarter corrosion allowance (*/4) as that of vessel shell for each surface of tray. (But, maximum corrosion allowance is 1.0 mm in both surfaces of tray deck plate) where, * = Corrosion allowance of vessel shell (5) Materials The material for pressure holding parts of the vessels and heat exchangers shall be in accordance with ASTM specification. (a) Material selection for pressure parts of vessels or heat exchangers shall be in accordance with instructions given by the process owner, if any. Unless otherwise instructed, materials for pressure parts shall be selected on the basis of the design conditions (pressure and temperature and medium) in line with the ASME code or equivalent materials can be used. (b) Basically, the materials for the non-pressure parts of the vessels and heat exchangers shall be in accordance with ASME and/or the other country's material specification. Materials for external parts directly welded to high-alloy steel vessels shall be as follows: All materials shall be of the same as the vessel shell or head if not specified otherwise like internals, rubber or bricklining, saddles, feet, reinforcement, clips etc. - External parts which are strength welded to shell shall be of similar composition to the shell. - External parts which are not strength welded to the shell, such as clips for insulation support rings, may be of carbon steel, when shell thickness is 6 mm or greater. When shell thickness is less than 6 mm, external parts shall be of similar composition to the shell. Heat exchangers - Seamless steel tubes shall be used for heat exchangers. - U-tube shall be one piece construction as far as possible. Head type of vessels and heat exchangers should meet 2:1 ellipsoidal as far as possible. Outside diameter wall thickness and pitch of carbon steel tubes for shell and tube heat exchanger in mm: Normal tube thickness for heat exchanger shall be in accordance with that specified in the licensor data sheets. Materials of Construction: Tube Bundle: 316 stainless steel Tube Sheets: 316 stainless steel Heads, process nozzles etc.: 316 stainless steel Shell: 316 stainless steel Insulation: Lugs for insulation attachment only. Spare Parts: A list of recommended spare parts with descriptions, part numbers and prices is required at the time of quotation. Should an order be imminent they are to be entered on NFM’s standard spare parts list one week after issuance of a purchase order. Drawings and Documentation: Preliminary sketches and drawings are required at the time of quotation. Notes and Deviations: Any and all changes to the original request for quote must be spelled out in detail explaining what and exactly why there is a |
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