1. Engineering Specification for Heat Exchanger 1.1 GENERAL ◐Two pass shell의 경우 Longitudinal baffle는 반드시 Welding할 것. ◐J or X type shell은 Condenser나 Reboiler의 경우만 Acceptable함. ◐Packed floating head or floating tube sheet joints(TEMA P or W)는 Not acceptable ◐Tube length : 6100 mm , 다른 tube length의 경우 Deviation작성 요 ▣Gasket : 18-8 spiraI wound ( non-asbestos gasket) ▣Temperature : ◐18℃이상 운전되는 H/E : Design metal temperature는 Max. anticipated fluid temp +28 또는 149℃ 중 큰 것으로 한다. ◐18℃이하 운전되는 H/E : 149℃ 및 Min anticipated fluid temp. -5℃가 되어야 한다. ▣Pressure : 다음 중 큰 것으로 한다. ◐Max. Operating Pressure + 10% ◐Max. Operating Pressure + 1.8 kg/cm2 ◐Pump shut-off Pressure + 5%(exchanger outlet가 blocked될 수 있을 경우) ▣Vacuum service의 H/E ◐Internal pressure 1.8 kg/cm2 minimum ◐external pressure I.O5 kg/cm2 ▣Corrosion allowance (Tube제외) ◐Carbon steel, low alloy pressure part : 3.O mm ◐High alloy pressure part : 1.5 mm 1.2 Steam surface condensers ◐Cleanliness factor는 85% ◐Multi stage ejector는 각기 Surface condenser설치할 것 ◐각 ejector는 Full venting load로 설계할 것 ◐Hydrazine으로 BFW를 처리할 경우 Surface condenser의 Air cooling region에 있는 Tube는 ASME이어야한다. 1.3 Shell, Channel, and Heads ◐Dished head는 2:1 ellipsoidal ◐Cladding,lining, or overlay의 Minimum thickness는 3 mm after machining ◐Liner는 Vent설치할 것 (Vacuum service 제외) ◐모든 fixed tube sheet exchanger에는 ShelI expansion을 설치한다.(severest조건으로 design) ◐Expansion joint는 Bellows type이며 full design movement에서 1500 cycle로 Rating 1.4 Tubes, tube bundles, and tubesheet ▣Fouling factor는 TEMA recommendation을 따른다. ▣단 Cooling water는 0.0004 M2.Hr.℃/kcal로 한다. ▣Liquid velocity는 0.9 m/s 이상이어야하나 Admiralty tube에서는 2.3 m/s를 초과해서는 안된다. ▣High alloy, non-ferrous(seamless or welded)의 Minimum tube size 및 gage는 19mm OD x 16 BWG임. 단 발주처가 Agree할 경우 16mm OD x 16 BWG 사용가능 ▣Admiralty(seamless)의 Minimum tube size 및 gage는 19mm OD x 16 BWG임. 단 발주처가 Agree할 경우 16mm OD x 16 BWG 사용가능 ▣Carbon steel (seamless or welded) ◐Fixed tubesheet : 19 mm OD x 14 BWG ◐Removable bundle : 25 mm OD x 14 BWG ▣Process fluid 와 섞여서는 안되거나 Process fluid에 의해 Tube collapse가 야기될 가능성이 있는 경우 Welded tube to tubesheet joint로 할 것. ▣모든 Shell and Tube Exchanger에는 tube impingement protection을 설치할 것. ◐Increaser type nozzle은 unacceptable. ◐Perforated plate는 발주처의 approval 필요 ▣Floating tubesheet와 Baffle 간격이 450 mm 이상일 경우 Support plate설치할 것 ▣Complete drainage 설비를 갖출 것 ◐Notch는 10 mm를 초과할 수 없다. ◐Pass partition은 6 mm hole을 만든다. ◐Steam이나 water가 shell에 Service될 경우 Vertical cut baffle을 사용할 것. ▣Carbon steel tubesheet는 특별한 규정이 없는 한 Admiralty tube와 함께 사용. ▣Austenitic stainless steel를 함유한 Molibdenum tube는 autogeneous longitudinal weld seam으로 사용불가 ▣Baffle및 Support plate의 minimum thickness는 1O mm 임. ▣Cooling water side의 nozzle은 flat faced flange 사용 ▣Blind flange는 NPS 3 이하 (for alloy or nonferrous ) ▣Lining, cladding의 경우 NPS 4 이상 사용가능 (Metal temp.가 허용된다면) ▣2.0 kg/cm2.G 이하 Steam 또는 C.W service의 경우 NPS 3/4 class 6000 half coupling을 Vent,dtain용으로 설치할 것. 기타의 Vent, drain 은 NPS 1, flanged일 것 ▣Cooler와 condenser의 water side에는 2개의 NPS 1-1/2 chemical clean-out connection을 설치할 것 ▣Steam surface condenser에는 Admiralty tube를 사용할 것 (Admiralty B,C,D) ◐이 때의 Tube sheet는 Naval brass, SB-171, Copper alloy UNS C46400 ◐Admiralty tube의 Max. temp.는 232℃임. ▣Bellows type expansion joint는 Inconel 600이며 Shell에 water service의 경우 Monel(Horizontal exch. only)사용 ▣Process hydrocarbon에는 Copper나 Silver가 함유된 재질 사용 불가 ▣Exchanger data sheet에 명기되어 있지 않을 경우 Baffle과 tie rod의 재질은 SS316 이어야 함. ▣Hydrostatic test pressure : UG-99(b) of the code ▣Hydrostatic test ◐300계열의 Stainless steel에는 Chlorine content가 30 PPM이하의 물을 사용할 것. ◐불가할 경우 물을 sodium nitrat로 inhibited시킬 것. ◐이때 Inhibitor 주입량은 Chloride량과 PH에 의하여 정할 것(0.1% sodium nitrate로 400ppm chloride, 8 PH cover) 2.CLARIFICATION ITEM / CHECK LIST FOR HEAT EXCHANGER 2.1 CODE ◈PRESSURE VESSEL SHALL BE DESIGNED IN ACCORDANCE WITH "ASME Sec.Ⅷ Div.1 1995 ED.+ 1996 ADD.",LATEST EDITION. ◈"TEMA Std,class B, 7th ED. + up to 1991 ERRATA",LATEST ED. ◈"EJMA. 1993.6th.ED.+1994 ERRATA",LATEST EDITION. 2.2 MATERIAL ◈"ASME" or "ASTM" MATERIAL SHALL BE USED. ◈IF "JIS" MATERIAL WILL BE USED FOR NON-PRESSURE PART, THE APPLIED PART AND MATERIAL COMPARISON LIST SHALL BE SUBMITTED IN ACCORDANCE WITH "MATERIAL DEVIATION SHEET". 2.3 DETAIL DESIGN ◈FOR THE DETAIL DESIGN OF H/EX THE "SPEC. SUMMARY SHEET", SHALL BE APPLIED/ SHALL BE CONFIRMED IN ACCORDANCE WITH "PROJECT SPECIFICATION ". 2.4 SCOPE OF SUPPLY/WORK ◈THE SCOPE OF SUPPLY/WORK SHALL BE IN ACCORDANCE WITH "REQUISITION". ◈IF ANY DEVIATION, VENDOR SHALL CLEARLY SPECIFY IN " DEVIATION LIST". 2.5 SPARE PART ◈THE SPARE PART SHALL BE SUPPLIED IN ACCORDANCE WITH "AMOUNT OF SPARE PARTS". ◈SPARE PARTS FOR 1-YEAR OPERATION SHALL BE SEPARATELY QUOTED. 2.6 WELDING PROCESS ◈FOR WELDING PROCESS, FCAW(FLUX-CORED ARC WELDING) MAY BE USED onLY UPON THE REQUIREMENT OF "FCAW APPLICATION LIMIT". 2.7 SUB-VENDOR LIST ◈SUB-VENDOR LIST(GASKET etc.) SHAlL BE SUBMITTED FOR APPROVAL. 2.8 UNITS SYSTEM ◈ALL UNITS(SYMBOLS, DIMENSION etc.) SHALL BE IN ACCORDANCE WITH METRIC SYSTEM EXCEPT FLANGE RATING & PIPE SIZE. (COMPUTATIONS MAY BE IN THE UNITS OF CHOICE, BUT ALL INPUT DATA AND RESULT MUST BE GIVEN IN THE METRIC SYSTEM.) 2.9 SPECIAL CONSIDERATION ◈THE FOLLOWING PARTS SHALL BE SPECIALLY CONSIDERED IN VENDOR'S QUOTATION.(REFER TO QUOTATION) 2.10 SUBMIT ◈VENDOR SHALL FILL-UP "QUOTATION SUMMARY SHEET" AND SHALL SUBMIT IT WITH QUOTATION. AND BREAKDOWN LIST SHALL BE SUBMITTED. 2.11 DEVIATIONS ◈DEVIATIONS FROM THIS REQUISITION SHALL BE CLEARLY LISTED IN "DEVIATION LIST". ◈UNLESS OTHERWISE SPECIFIED IN THE DEVIATION LIST,VENDOR MUST FULLY SATISFY ALL REQUIREMENTS OF DESIGN DATA SHEET,PROJECT SPECIFICATION AND SUPPLY/WORK SCOPE SPECIFIED IN THE REQUISITION. 2.12 REQUIREMENTS ◈THE FOLLOWING PARTS SHALL BE SPECIALLY CONSIDERED IN VENDOR'S QUOTATION.(REFER TO QUOTATION) ◈VENDOR SHALL DESIGN THE DETAILED DEMENSIONS IN ACCORDANCE WITH "CODES" AND ATTACHED "SHELL & TUBE TYPE HEAT EXCHANGER DESIGN GUIDE", AND MEET THE GENERAL REQUIREMENT OF "JOB SPECIFICATIONS". ◈ALSO, VENDOR SHALL GAURANTEE THE STRENGTH OF EQUIPMENT. 3. SPEC' SUMMARY SHEET FOR SHELL & TUBE HEAT EXCHANGER *. The information given shall include but not be limited to the following. 3.1 WIND LOAD( P=cqA ) ⑴WIND VELOCITY : 40 m/s ⑵DESIGN WIND PRESSURE(q) ◈H ≤ 16 M -----> q = 50 ◈H > 16 M -----> q = 100 ( H : Meter , q = ㎏/㎡ ) ⑶AERODYNAMIC LOAD COEFFICIENT(c) REFER TO SPECIFICATION ①SMOOTH SURFACE +.h/D = 1 → 0.5 +.h/D = 7 → 0.6 +.h/D = 25 → 0.7 ②ROUGH SURFACE +.h/D = 1 → 0.7 +.h/D = 7 → 0.8 +.h/D = 25 → 0.9 ※USE INTERPOLATION FOR OTHER h/D VALUES ⑷FOR PROJECTED AREA(A) CALCULATION, +.COEFFICIENT OF EFFECTIVE DIAMETER : 1.3 FOR ALL ITEMS 3.2 PRESSURE ◈FOR VACUUM SERVICE,EXTERNAL PRESSURE : 1.05 ㎏/㎠G ◈MINIMUM INTERNAL PRESSURE : 1.8 ㎏/㎠G 3.3 SEISMIC LOAD ◈SEISMIC FACTOR K = 0.05 3.4 ERECTION LOAD FACTOR ◈ERECTION LOAD FACTOR FOR ERECTION & HANDLING = 1.2 3.5 JOINT EFFICIENCY ◈HEAD : 1.0 ◈SHELL : Min. 0.85(VENDOR MAY USE HIGH JOINT EFFICIENCY CONSIDERING ECONOMICAL DESIGN) 3.6 MATERIAL ◈SHELL/HEAD/EXTERNAL ATTACHMENT :AS PER "ENG'G DRAWING" OR "DATA SHEET" ◈INTERNAL WELDED ATTACHMENT AND SUPPORT --> THE SAME AS SHELL MATERIAL ◈MAXIMUM CARBON CONTENT OF STAINLESS STEEL SHALL BE O.O40 % 3.7 ALLOWABLE STRESS ◈BODY MATERIAL : AS PER CODE ◈HIGH ALLOY FLANGE : LOWER ALLOWABLE STRESS TO BE USED ◈ANCHOR BOLT : 1055 kg/㎠ ◈ALLOWABLE BEARING PRESSURE : 40.8 kg/㎠ ◈CONCRETE COMPRESSIVE STRESS : 280 kg/㎠ 3.8 MIN. THICKNESS OF H/EX ◈SHELL AND HEAD : ACCORDING TO TEMA TABLE CB-3.13 ◈FOR ALLOY SHELLS,HEADS & CHANNELS, CORROSION ALLOWANCE SHALL BE ADDED TO MIN.TH'K LISTED IN TEMA TABLE CB-3.13 ◈MIN. THICKNESS OF LINING ,CLADDING or ALLOY WELD OVERLAY : 3 mm ◈MIN. THICKNESS OF SUPPORT : 6 mm (INCLUDING C.A 1.5mm) ◈MIN.TUBESHEET TH'K : 38mm 3.9 CORROSION ALLOWANCE (EXCLUDE TUBE) ◈BODY : AS PER "ENGINEERING DRAWING" OR "DATA SHEET" GENERAL : C.S(3mm) , SUS(1.5mm) ◈SADDLE, LUG : 1.5 mm(TOTAL) ◈EXTERNAL ATTACHMENT : NONE ◈ANCHOR BOLT : 3 mm( dia.) ◈INTERNAL ATTACHMENT +.NON-REMOVABLE PART : 3mm FOR EACH SURFACE OF INTERNALS (C.S) , 1.5mm FOR EACH SURFACE OF INTERNALS (S.S) +.REMOVABLE PART : 1.5mm FOR EACH SURFACE OF INTERNALS (C.S) 3.10 NOZZLE ◈AS PER ENG'G DRAWING 3.11 MISCELLANEOUS ◈MINIMUM DISTANCE OF STIFFENER RING : 3600 mm ◈FIRE PROOFING +.AS PER ENG'G DRAWING +.MATERIAL DENSITY : 2400 kg/㎥ ◈INSULATION +.THICKNESS : AS PER ENGINEERING DRAWING +.MATERIAL DENSITY : 100 kg/㎥ ◈MISCELLANEOUS DESIGN LOAD : AS PER SPECIFICATION ◈MINIMUM THICKNESS OF PASS PARTITION : 10mm (GASKET CONTACT SURFACE) ◈MAXIMUM CARBON CONTENT OF STAINLESS STEEL WELDING RODE : 0.04% ◈THE INTERNAL WELDS OF TYPE 317L SS EQUIPMENT SHALL BE OVERLAYED WITH TYPE 904L OR EQUAL ALLOY. ◈EXPANSION JOINT +.BELLOWS TYPE AND RATED FOR 1500 CYCLE +.MATERIAL:INCONEL 600 EXCEPT UNS 4400(MONEL) FOR HORIZONTAL EXCHANGER WITH WATER on THE SHELL SIDE. +.SHIPPING BARS |
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