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thank you, kenvlach. The spec does really not mention how to do passivation. I am not familiar with Syltherm XLT and totally have no idea about this requirement.

Thanks quark. It is true that my client's spec asks for 180 grit external surface finish. This applies to all exposed SS pipes, SS cladding for CS pipes, SS outer layer for insulation and even for supports as well. I had a discussion with my client about this matter. I just wonder if there are...

May anybody tell me what is the reason that polished exterior pipe sueface is required for clean room for pharmaceutic plant?

I got one spec from my client for syltherm CS (API 5L) piping. It asked all piping system to be shot blasted to SA 2.5 internally and passivated after blasting. Could anyone commented what's the purpose for this? Thanks and Regards,

Thanks all! I read BS fire testing code and find the testing temperature is 980 DegC holding for 30 minutes. If such, I think all seals have burnt out without doubts. Recently I had a discussion with the client. They said failure due to ball seats are higher to 20% to 40% (I am not going to...

BSQUAREDBUCKEYE: Thanks for your reply and it is really help me a lot. So it should be clear to say that 'fire safe' means leakage during fire-testing is not exceed what codes require. (While one supplier told me fire safe means valves still can be closed functionally after or during fire).

I had lots of discussion with my suppliers in regard of fire safe and choice of seals materials for ball valves recently. But I found their technical support could not give me a good answer of why graphite filled PTFE has to be used for body seals for fire safe purpose. I am curently preparing...

thank angeri and SJones. I really got some fresh air from your suggestion.

Dear All: Appreciated if someone can tell me if there are some special requirements for ball valves used for hydrogen gas service. And any national codes for this? Thanks and Regards,

we know there are rules for a game. in my company, different PMs have different rules to apply, different projects have different rules to be followed as well. it looks no choice for me. everthing is about costing. everyone likes to earn without pay. hehe :). (maybe I am wrong.) in fact, if i...

grad: thanks a lot first. I knew the spacing is a part of consideration for insurance and some countries also have the special codes for the requirements for spacing regarding the fire protection. Spacing is also under the fire authority in some countries. we also do hazop study here, but only...

thanks all! some usefull links: 1. Factory Mutual http://www.fmglobal.com/approvals/resources/resources.asp but unfortunately I did not find any information about equipment spacing. 2.the link to AICHe on-line catalog http://www.aiche.org/pubcat/ I found the brief about "Guidelines for...

thanks, grad. could you tell me the links to PIP and IHI (should be IRI?) because i could not find them after searching internet or could you tell me the codes' numbers so i can search our local authority?

could any one tell me which codes (api or ul, i am not sure and do not know what number) i shall refer to for equipment layout design for refineries regarding the minimum clearance between different equipment and/or units such as furnaces, air coolers, roads, reactors, battery limits etc, for...

"water hammer is manifest as a series of SHOCKS, sounding like hammer blows" this the description from piping handbook by crocker king who just indicate the following reason: "instantaneous or too rapid closing of valve in the line or by an equivalent stoppage of flow&quot...

Thanks all in fact, my poject consultant comes from UK so there is no choice to deviate from their tender specification which requires BS shall be adopted. while i found a lot of mistakes in their specification, it is hard to prepare our piping specification for this project. for example, they...

DEAR ALL: I NEED TO PREPARE PIPING SPEC FOR A WATERWORKS PLANT. BUT MY CLIENT ASK US TO USE BRITISH STANDARDS WITH WHICH I AM NOT FAMILIAR AT ALL. MAY ANYONE TELL ME SOME CODES NUMBERS FOR FOLLOWING ITEMS: 1. MATERIAL CODES FOR C.S., S.S., PVC, UPVCS AND ABS 2. PIPES, FITTINGS, FLANGES, NUTS...