Agreed with the AI. MAWP should be the lowest from any element in the Vessel. One may have chosen a thickness that withstand 300 psi at 80 deg F, but if you have a #150 flange then your MAWP will be 285 psi due to the flange.
Hello everyone,
My career as a mechanical engineer has been mostly in the EPC, mainly fabrication in O&G. Working with packaged equipment, pressure vessels, piping and structural for upstream and midstream onshore facilities. My previous employer was not any major coporation but a family...
TGS4 thank you! It makes sense what my superiors meant to say. They meant that the allowable stress doesn't change up to and including 500 deg F. I wish I had the code book to view these tables and not to search the internet.
By the way, the material is SA-516-70 and Sec VIII Div 1.
Hello,
I've been inspecting local fabrication shops and i've noticed that at each one they do not factor the stress ratio [Stress Value of the metal at test temperature / Stress Value of the metal at design temperature].
E.g.:
Contact Tower
MAWP: 1360 psi @ 195 deg F
Leak test was done at...
That is true, but it applies for vertical vessels due to vertical forces: gravity, buoyancy and flow velocity. In a horizontal vessels the droplet is only subjected to gravity and buoyancy forces, thus gravity being the large of both. So, the droplet will be falling as it flows through the...
@georgevergheses
Would you agree that when the vapor enters the vessel and then flow at a much higher rate than the dropout velocity, the drops will have a downward vertical velocity equal to the dropout? This is what I understand when in API RP 521 the dropout time is calculated by dividing the...
bimr,
Thank you for the reference but that explanation in the link is for a vertical vessel containing a mesh pad which determines the flow conditions inside. My question is based on a flare header knockout drum with no internals but a baffle at the inlet.
I am sizing a horizontal knockout drum for the flare line based on API 521 for a transmission line booster station. The incoming gas is very dry and we assume that any liquid will be mostly water.
Data
Vapour rate Q'v = 64 MMSCFD
Vapour rate Qv = 27222 ACFM
Liquid rate Q'l = 10.3 bbl/d
Operating...
Hello everyone,
We hired a manufacturer to build a produced water treatment skid, containing a Vertical Water Skimmer tank and a Flotation Cell tank. The skid will be operating for a temporary plant for a 5 year span located near the tropical rain forest. Both tanks are of Stainless Steel and...
SnTMan,
Made complete sense! I did think it was N&C in the back of my head, but the example made no mention of this and it specifically says MAWP while using a non corroded thickness.
I'm assuming a vendor would supply the forming tolerance, right?
Hello everyone,
I've started reading on pressure vessel design, specifically "Pressure Vessel Handbook" 9th Ed. by Megyesy, and have come up with doubts on when to apply the Corrosion allowance while calculating the required/minimum thickness and MAWP.
EXAMPLE from the book
GIVEN DATA
Design...
