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Pipers,,,Can you throw some light to the query??

Dear Pipers, Came across a request from 'End-User' to the use of 'Spiral Wound Gaskets with Inner Ring_ASME B16.20' in place of existing 'Flat Ring Gaskets_ASME B16.21'. It was briefed on the limitations for the use of "Spiral Wound Gaskets with Inner Ring_ASME B16.20" to thin wall pipes, in...

Dear All, Have come across a query on the need for PWHT on cast body. Need your expert opinion.!!! However, as per code requirements and per specific client needs, any cast imperfections with weld repairs (or) structural welding of any cast valve component that will be in contact with sour...

Have a scenario, where I had to weld a 2" piping connection (through HOT TAP) on to an 24" A234-W elbow, oriented in skewed direction, i.e., elbow rotated in 2 plane. would like to explore the feasibility of executing hot tap of 2" connection anywhere in the surface of the elbow or is there a...

Hi mike, as far as my understanding.. all ASTM A516 plate materials shall be UT tested in accordance with A578 for identification of discontinuity or cracks in the plate material. If ASTM A20 is not applicable for heat treated plates ( normalized) as indicated in section 1.4, then my question is...

My query is all about the interpretation of section 1.4.. my understanding on this section,is that the normalized plated or heat treated plates wouldn’t be tested or complying to general requirements in accordance with ASTM A20?? If so, how to determine the UT acceptance level for a material or...

Dear All, During my review of an material test certificate of A516 Gr70 plate material,the supplier has qualified the UT testing of a plate to level B. I raised a query of why not qualified for level C, which is the stringent one and as required by ASTM A20 requirement also. However received an...

Thanks for your replies. It really means a lot.

Does 100% radiography a mandatory requirement for standard class valves, 150 LB fire water service valve with cast steel body?? As per ASME B16.34, it states that, radiography is a mandatory requirement for Special class valves, so, can we interpret this statement that, no radiography is...

Thanks MickMc, I completely Agree to you on the stand that, the thread will in no way be in contact with the service fluid, however, the TEFLON tape which is winded on to the threaded joints (Normal Industrial Practice), will that itself be a good corrosion resistant??? [bigears]

MickMc Thanks. Is there any other way, other than changing the material of the plug, we can resist the corrosion on the thread of the plug.??probably, any corrosion resistant tape would work here>>

Dear All, I came across a clarification / query on one of the Y-type strainer used for the seawater services. The thing is, the body of the strainer is Cast steel with internal EPOXY coating to protect from corrosion, as the service is seawater. but the drain plug on the strainer, which is...

Dear donf & zdas04,gerhardl, Thanks for your excellent suggestions and answers. First time i am hearing about this Remote valve Operator, and it seems to be an apt answer to my case. Will get into touch with these experts and will share with you the informations. Thanks

Dear All, I had been through a case where, the 6" ball valve, trunnion mounted was erected with gear operator. But, after the commissioning, the operation team of the plant is asking for valve access from the platform located 1.5 meters above. Even the provision of platform is very difficult to...

Thanks to moltenmetal and Danlap to share their knowledge and experience.

Thanks all for the inputs. However, i have seen cases where the design temperature is around 200+ deg celcius and the operating is somewhat around 120-130 deg celcius for sour service environment, where they look for tight seal. As we all know that, Soft seals give better sealing than the Metal...

Dear all, I know that, many threads explain about the selection of seat material and its pressure and temperature ranges for specific fluid services. Also many vendor charts show the Seat material specifications and its limitations with respect to the pressure and temperature. However, my...

Hi all, In one of our projects, we requested to VENDOR for a Fire test Certificate for the Metal seated check valves. But the VENDOR replied that, metal seated valves are intrinisically fire safe and no fire test is applicable. But when i had gone through the API 6FA / ISO 10497, they mention...

Hi, The selection of seal materials for ball valves shall be based on actual maximum and minimum operating temperatures of the valves, pressure fluid composition and chemical product used. And it is not based on the Line class pressure / temperature design conditions. ET

Thanks to Little inch, Bimr for the brainstorming explanations... going thru the API RP 581 for more informations... Thanks.