LNG Vessel / Tank

Date 07-12-2013 14:13 Edited 07-12-2013 14:16

Vehicle fuel tank, vertical storage vessel, API storage vessel, railcar, OTR transport, ISO container, other. The list goes on and each has a different code or codes. @ 3.6 psi, either that is vapor pressure only, or the tank is not very deep. Need a bunch more info before anybody could bromide any guidance.

By Joey

Date 07-15-2013 01:47

fschweighardt,

It seems you know many applicable codes since you mentioned “Vehicle fuel tank, vertical storage vessel, API storage vessel, railcar, OTR transport, ISO container, other”But I was not asking for a particular code for a specific usage. Appreciate it if you can share all the codes that you know. Trust me, I will not be fussy to get your input.

Thanks
~Joey~

By G.S.Crisi (****)

Date 07-13-2013 20:08 Edited 07-13-2013 20:14

Pressure vessel is one thing, storage tank is another one.
According to ASME VIII, a pressure vessel is designed for a minimum pressure of 15 psig. So, for a pressure of 3,6 psig (the letter "g" is very important), you're talking of a storage tank.
The tank you described is covered by API 620 Appendix R.
Materials of construction would be aluminum or 9% nickel steel. You decide which one, based on economical considerations.
Giovanni S. Crisi
Sao Paulo - Brazil

By CWI555

Date 07-15-2013 01:13 Edited 07-15-2013 01:20

Giovanni,

Appendix R is + 40°F to – 60°F.
Appendix Q covers low-pressure storage tanks for liquefied hydrocarbon gases at temperatures not lower than – 270°F.
LNG would be Appendix Q would it not? Materials could be ASTM A353, A 553, or A 645.

Regards,
Gerald

By Joey

Date 07-15-2013 01:51

Thanks Gerald & Prof Crisi

By G.S.Crisi (****)

Date 07-15-2013 19:34

Gerald,
I don't have the API 620 on hand, but I'll take for granted what you say about the Appendix that covers Joey's tank.
Regarding materials, however, I insist on aluminum or 9% nickel.
Giovanni S. Crisi

By CWI555

Date 07-15-2013 23:50

I am not arguing the best material, only what the standard allows.

By G.S.Crisi (****)

Date 07-16-2013 18:24 Edited 07-16-2013 18:46

Again, I don't have API 620 on hand, but if you say that Appendix Q allows only the materials that you mentioned, I'll take your word for granted.
Does the standard actually allow only those materials to be used for cryogenic tanks? There are hundreds of cryogenic tanks made in aluminum all over the world.
Aluminum doesn't have ductile - fragile transition and its tensile strength at absolute zero is the same than at 20 Celsius (68 F)
Giovanni S. Crisi

By 46.00

Date 07-17-2013 05:19

Giovanni, API 620 allows the use of several aluminum alloys as well as 9% Nickel for tank construction. Table Q.1 lists the materials allowed.

By CWI555

Date 07-20-2013 16:21

I stated 'could' be in context of your statement:
" I insist on aluminum or 9% nickel.
Giovanni S. Crisi "

Not as an all inclusive list.Some of the aluminum options:
B 210, Alloy 3003
B 210, Alloy 5154
B 241, Alloy 5454

My post was taken slightly out of context if it was taken as an all inclusive list.

By 46.00

Date 07-20-2013 16:55

Granted!