I have seen some materials having different allowable stresses in ASME B31.3 as compared to ASME Sec VIII Div.1.
B31.3 has higher allowable stresses for some materials.
As regards to inspection and testing ,hydro test per B31.3 is 1.5 times MAWP (or design pressure) while in Sec VIII it is 1.3...
If any of these stacks are refractory lined internally, you will have to be careful so as not to damage existing refractory lining due to welding and/or vibration during retrofitting.
Check with ASPEN,I think they may have module for cost estimating. ASPEN EDR ( Exchanger Design Rating ) program has one form in which user can set up cost data. The program will in turn estimate the cost of heat exchanger, but for this you will have to perform your heat exchanger design in ASPEN.
Refer to Section II-A and you will notice that Impact testing is not a mandatory requirement for SA 516 grade plates , it is a supplementary requirement.
Impact test will become mandatory for plate supplier only if you specify it in your purchase order.
If you are a pressure vessel fabricator...
Para 17.5.1.2 of API 560 mentions alternatives when hydrotesting is not practical for any reasons.But i doubt if this a practically possible for a convection coil of furnace which is already installed in furnace and hence all of coil is not accessible for visual inspection.
However if question...
Apart from Mechanical design perspective correctly pointed out by vesselfab , you need to consider process reasons as well.
You cannot change from ellipsoidal head to flat plate without changing overall height of vessel. Vapour exit nozzle on top head is required to be at certain distance from...
Purpose of steam out is only cleaning. For equipments where presence of any impurities like grease,paint traces etc are unacceptable , steam out is specified.
Some vessel design specifications will ask you to account of vacuum design condition whenever steam out is specified. Some...
Hi All,
I agree with gr2vessels. Also by developing your own program you would definetly have greater insight of code than by solving few examples using commercially available softwares
But issue is when a EPCM company looks for such program , main intention is to produce engineering drawings...
Samkor,
Welcome to fabulous world of pressure vessel engineering.
Reinforcement is not for nozzle it is for the cut out made in shell/head. To put it very few words we can safely say that it is replacement of area lost due to cut out made in shell/head.
For Set In ( Set Through) construction ,nozzle neck is inserted through vessel shell , for Set On type of construction nozzle neck is abutting the vessel wall.
If you are using ASME code, please have a look at Fig
UW 16.1(c),(d) ,(e) which shows Set In (Set-Through) type with welding from both...
Equations for internal pressure desgin are slightly different in B31.3 as compared to Sec Viii Div 1. For external pressure design B31.3 refers back to Sec Viii Div 1.
Piping components are out of scope Sec Viii Div 1 , see U-1(c)2(e)
Rezapayman,
Use of combined RF pad is common especially on big process columns which have plenty of nozzles alongwith pipe and platform support clips.
However if your openings are on same center line , your design (assuming you are using ASME code ) will be goverened by UG-42(c) and question...
Hi mielke,
What type of exchanger are you dealing with , fixed tubesheet or floating head ?
In case of floating head exchangers floating head flange require large bundle to shell clearance as compared to fixed tubesheet exchangers. This clearance is function of design pressure , greater the...
Gasket can fail due to many reasons other than material of gasket. One of the main reasons could be crusing of gasket , to avoid crushing of gasket ensure that initial bolt loading does not exceed the gasket seating stress y. Gasket may also fail due to improper design of flanges.
What all types...
You must be having a by-pass stack in your heat recovery system,to help GT running even when your recovery system is down.
In one of the project we had used coupled louver dampers , one at base of by-pass stack and second one before guillotine in main duct.When heat recovery coil bundle was down...
No 11echo, any reputed vessel fabricator will not deny to take the responsibility of ANY part of vessel fabricated by them. Vessel fabricator will check the design provided to them and if found okay they will take the responsibility.
If they find any gaps in design they come back to the...
Requirement of Impact test for any material is function of thickness of material & MDMT. Hence there is no such "Minimum temp limit" for any material , as regards to impact testing.
Additionally there clauses for reduction in MDMT mentioned in UCS-66 and UCS-68(c) of ASME Sec Viii Div 1.
As...
Not sure of the required and available reinforcement areas , however you can check if projecting nozzle neck on inside of vessel wall and reducing RF pad thickness to say 36 mm meets reinforcement calculations.
Be sure to check with yout process people , if projecting nozzle neck inside of...
SA 516 Gr.70 plates would not impact tested to this low temperature. Vessel having MDMT of -105 Deg C will not be of SA 516 Gr 70 plate.
Have a look at SA-20 which gives generally available thickness and minimum test temperature combinations meeting charpy V- notch impact requirements.
