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E-type shells in shell-and-tube heat exchangers:
Ebert and Panchal equation, for crude oil fouling,
Eckert number,
Eddy viscosity:
Eddy diffusivity, of heat,
Edge, D,
Edwards, D K
EEC code for thermal design of heat exchangers,
Effective diffusivity,
Effective thermal conductivity of fixed beds,
Effective tube length in shell-and-tube heat exchangers,
Effectiveness of a heat exchanger:
Efficiency of fins,
Eicosane:
Eicosene:
Ejectors, in flash distillation plant,
EJMA (Expansion Joint Manufacturers Association), standards for expansion bellows
Elastic properties of solids:
El-Dessouky, H,
Electrical enhancement processes, in heat transfer augmentation,
Electric fields, effect on properties of rheologically complex materials,
Electric fields, in augmentation of condensation,
Electrical process heater, specification of,
Electrokinetics, for heat transfer augmentation in microfluidic systems,
Electromagnetic theory of radiation,
Electrostatic fields in augmentation of heat transfer,
Elements:
Elhadidy relation between heat and momentum transfer,
Embedding methods for radiative heat transfer in nonisothermal gases,
Embittlement, of stainless steels,
Emission of thermal radiation, in solids,
Emissivity:
Emitting media, interaction phenomena with,
Emulsions, viscosity of,
EN13445 (European Pressure Vessel Codes), design of heat exchangers to,
Enclosures:
Energy equation:
Energy recovery, maximum, in heat exchanger network design,
Enhanced surfaces, fouling in,
Enhancement devices:
Enlargements in pipes:
Enthalpy:
Entrainment in annular gas-liquid flow
Entrance effects in heat and mass transfer:
Entrance lengths, hydrodynamic in pipe flow,
Entrance losses for tube inlet in shell-and-tube heat exchanger,
Entry losses in plate heat exchangers,
Entropy generation and minimisation
Environmental impact, of fouling,
Eotvos number:
Epstein, N,
Epstein matrix, for fouling,
Equalizing rings, for expansion bellows,
Equilibrium interphase:
Equilibrium vapor nucleus,
Equivalent sand roughness,
Ergun equation, for pressure drop in fixed beds
ESDU correlations:
Esters:
Ethane:
Ethanol:
Ethers:
Ethyl acetate:
Ethylacetylene:
Ethylacrylate:
Ethylamine:
Ethylbenzene:
Ethyl benzoate:
Ethyl butanoate:
Ethylcyclohexane:
Ethylcyclopentane:
Ethyl formate:
Ethylene:
Ethylene diamine:
Ethylene glycol:
Ethylene oxide:
Ethylmercaptan:
1-Ethylnaphthalene:
2-Ethylnaphthalene:
Ethyl proprionate:
Ethyl propylether:
Ettouney, H,
Euler number:
Eutectic mixtures, condensation of forming immiscible liquids,
Evaporation:
Evaporative crystallisers,
Evaporators:
Exergy, definition of,
Exergy analysis,
Exit losses for tubes in shell-and-tube exchanger,
Expansion bellows, for shell-and-tube heat exchangers:
EJMA (Expansion Joint Manufacturers Association), standards for
Expansion joints, mechanical design of:
Expansion of tubes into tube sheets:
Expansion turbine, lost work in,
Explosively clad plate,
Explosive welding of tubes into tube sheets
Explosive expansion joints,
Extended surfaces (see also Fins)
Externally induced convection, in kettle reboilers,
Extinction coefficient,
Extinction efficiency,
Eyring fluid (non-Newtonian),
Index
HEDH
A
B
C
D
E
E-type shells in shell-and-tube heat exchangers:
Ebert and Panchal equation, for crude oil fouling,
Eckert number,
Eddy viscosity:
Eddy diffusivity, of heat,
Edge, D,
Edwards, D K
EEC code for thermal design of heat exchangers,
Effective diffusivity,
Effective thermal conductivity of fixed beds,
Effective tube length in shell-and-tube heat exchangers,
Effectiveness of a heat exchanger:
Efficiency of fins,
Eicosane:
Eicosene:
Ejectors, in flash distillation plant,
EJMA (Expansion Joint Manufacturers Association), standards for expansion bellows
Elastic properties of solids:
El-Dessouky, H,
Electrical enhancement processes, in heat transfer augmentation,
Electric fields, effect on properties of rheologically complex materials,
Electric fields, in augmentation of condensation,
Electrical process heater, specification of,
Electrokinetics, for heat transfer augmentation in microfluidic systems,
Electromagnetic theory of radiation,
Electrostatic fields in augmentation of heat transfer,
Elements:
Elhadidy relation between heat and momentum transfer,
Embedding methods for radiative heat transfer in nonisothermal gases,
Embittlement, of stainless steels,
Emission of thermal radiation, in solids,
Emissivity:
Emitting media, interaction phenomena with,
Emulsions, viscosity of,
EN13445 (European Pressure Vessel Codes), design of heat exchangers to,
Enclosures:
Energy equation:
Energy recovery, maximum, in heat exchanger network design,
Enhanced surfaces, fouling in,
Enhancement devices:
Enlargements in pipes:
Enthalpy:
Entrainment in annular gas-liquid flow
Entrance effects in heat and mass transfer:
Entrance lengths, hydrodynamic in pipe flow,
Entrance losses for tube inlet in shell-and-tube heat exchanger,
Entry losses in plate heat exchangers,
Entropy generation and minimisation
Environmental impact, of fouling,
Eotvos number:
Epstein, N,
Epstein matrix, for fouling,
Equalizing rings, for expansion bellows,
Equilibrium interphase:
Equilibrium vapor nucleus,
Equivalent sand roughness,
Ergun equation, for pressure drop in fixed beds
ESDU correlations:
Esters:
Ethane:
Ethanol:
Ethers:
Ethyl acetate:
Ethylacetylene:
Ethylacrylate:
Ethylamine:
Ethylbenzene:
Ethyl benzoate:
Ethyl butanoate:
Ethylcyclohexane:
Ethylcyclopentane:
Ethyl formate:
Ethylene:
Ethylene diamine:
Ethylene glycol:
Ethylene oxide:
Ethylmercaptan:
1-Ethylnaphthalene:
2-Ethylnaphthalene:
Ethyl proprionate:
Ethyl propylether:
Ettouney, H,
Euler number:
Eutectic mixtures, condensation of forming immiscible liquids,
Evaporation:
Evaporative crystallisers,
Evaporators:
Exergy, definition of,
Exergy analysis,
Exit losses for tubes in shell-and-tube exchanger,
Expansion bellows, for shell-and-tube heat exchangers:
EJMA (Expansion Joint Manufacturers Association), standards for
Expansion joints, mechanical design of:
Expansion of tubes into tube sheets:
Expansion turbine, lost work in,
Explosively clad plate,
Explosive welding of tubes into tube sheets
Explosive expansion joints,
Extended surfaces (see also Fins)
Externally induced convection, in kettle reboilers,
Extinction coefficient,
Extinction efficiency,
Eyring fluid (non-Newtonian),
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
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Specifications
DOI 10.1615/hedhme.a.000462
4.9 SPECIFICATIONS AND TENDERS
4.9.2 Specifications
David Edge
What problems would occur if an inquiry were issued without a job specification and simply called up the applicable design code? After the purchase order was placed, the contractor would have to negotiate, typically, the price and delivery of spares, number of copies of drawings, guarantees, extent of supply, special tools and test equipment, and so on.
The code covers the detailed mechanical design methods to be used and refers to a large number of allowable materials of construction with their associated design stresses. It also details fabrication and inspection methods. The code requirements are legally mandatory in many countries.
A specification will add the contractor's and client’s technical requirements and clarify the code (or standard) when choices are available. It should contain a design and fabrication section based on experience in fabrication and problems in the field.
The specification, when accepted by the vendor, will be contractually binding. It will not deal with commercial considerations. Table 1 gives a list of items that should be included in most specifications. Table 2 lists typical requirements for shell-and-tube heat exchangers. Table 3 lists typical requirements for air-cooled heat exchangers. Table 4 lists typical requirements for plate and frame type heat exchangers. Table 5 considers a package unit (a cold box), which has much broader scope and requires liaison with other engineering disciplines. Table 6 lists typical requirements for electrical process heaters.
Table 1 Typical checklist common to most specifications
| a Specify if after heat treatment; vendor may wish to do this before heat treatment only. | |
| Topic | Comment |
|---|---|
| Scope of the specification | Summary of the specification content (design, materials, fabrication, inspection, testing, painting, preparation for shipment, and documentation). Define the type of equipment. |
| Codes, standards, etc. Internal specifications | Comprehensive list of all relevant codes and standards with dales. |
| Vendor responsibilities Guarantees | For thermal design, mechanical design, fabrication, testing, painting, shipment as applicable. |
| Extent of supply Instruments Instrument connections Electrical and instrument cables Cooling water supply lines on package units, etc. | Important on package and skid-mounted units. Use diagrams to show what is supplied by vendor and what is supplied by others. |
| Documentation Design data Drawings Data report Certified material record report Weld procedures Certified (insurance) inspection Certificates | Specify which documents are required at tender (quotation) stage and which are needed after the order. Vendor should supply a schedule of all drawings for the order with a full description of each drawing and latest issue date. This is very important on package units and should be maintained throughout the job. |
| Design | See relevant equipment type. |
| Selection of materials Generic materials by contractor/client Allowable substitutes in various countries Clad or solid | Do not put onus on the supplier. Generally the supplier will put in the minimum-cost suitable material. Client/contractor should select materials based on experience and required life of the plant. |
| Fabrication Low-temperature requirements Hydrogen service requirements Clad plate Postweld heat treatment | Do not duplicate the code. Clarify when alternatives are offered. |
| Inspection Radiography a Ultrasonic testing of plates a Magnetic particle a Dye penetrant inspection a Impact testing | Extent of nondestructive testing (NDT) should be defined at the tender (quotation) stage. After the order, vendor should supply an NDT map showing locations of ail inspection on a general arrangement drawing. |
| Testing Pressure tests, hydraulic/pneumatic Special leak tests Proof test Burst to failure tests | Brittle lacquer/strain gauge. Generally for items not in the scope of the code. |
| Quality control | At the tender stage the vendor should submit a quality assurance manual and an inspection/test plan that includes a schedule of manufacture. After receipt of order the vendor should prepare a detailed quality plan. |
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