5 replies to this topic

[Lowflo]

I need to understand the rules for relief design in China. As I understand it, the applicable code is GB150. Before I buy it, I want to be sure this is the right document.

 

I read the summary of GB 150:2011 on an internet site that sells standards, but the summary didn't specifically say this standard covers overpressure protection requirements. It primarily discussed pressure vessel design requirements.

 

Can anyone comment on whether this is the right document for pressure relief design in China?

 

Thanks.

[senthil13]

Hello,

 

GB (Guo Biao) also called National standard for Republic of china is used in all Chinese design practices.

 

I have ran into a similar situation in my past Design experience with China. we designed all our relief valves for the project ( installed in china) and got rejected when the CDI ( Chinese Design Institute) reviewed it. Discussing with them we came to know about GB 150, pressure vessel code

 

GB 150 is the correct document for relief design in china

 

FYI

 

All the relief valves were required to be redesigned using GB CODE. but we saw variation in sizes ( compared to API design) finally we all came into an agreement to use API for relief design after multiple meetings and discussions.

 

If you need more info on this let me know. I'm happy to help.

 

Senthil

[breizh]

Lowflo

 

The CDI ( Chinese design institute) which is going to work on your project will apply the standards in force in CHINA (GB).

 

Breizh 

[Lowflo]

Thanks guys. I'll buy a copy of GB150 Pt1. Hopefully I won't find any surprises - requirements beyond standard industry practices.

 

I work for a company that has plant facilities in China. I haven't encountered CDI. Do they get involved in engineering decisions when the engineering is perfornmed by the owner operator?

[senthil13]

CDI normally get involved during detail engineering phase of the project. But most engineering companies are aware that CDI will get involved and they will be well prepared.

[Lowflo]

Well, I bought an English copy of GB 150:2011. I read it and there were indeed some surprises. I understand why projects often have to do some re-work.

 

For the most part it's easy to read and understand, but there were a few sections for which I sought another English translation. Fortunately, I have a copy of the same document in the original Chinese, and a Chinese colleague was able to help me understand the meaning.

 

The requirements themselves are simplified compared to those in API 520 pt1, and they're prescriptive. The fire heat input calculation is different from API 521. I haven't yet done a comparison to see which is more conservative. The rupture disk sizing requirements are much different. Curiously, it restricts the pipe diameter and the amount of pipe on the upstream and downstream sides of the disk. The PSV orifice area equation doesn't account for Kb or Ksh. At least for vapor service, you'll generally calculate a smaller orifice area as compared to API equations. There are some unique installation requirement too.