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According to the relevant standards and codes, is there a minimum recommended diameter for a manway e.g. 24 inches." , so that the entry into the vessel can be refused due to safety reasons. Is that also valid for entering pressure vessels for inspection during total shutdown of the Plant...

Of course, I didn't mention these, because they are all provided and do not related directly to my question (No PWHT required)

Hello and thanks for the reply. Yes, there is RT report' But, by cutting and rewelding the joint, you are risking losing the proper dimensions needed for the piping as it is part of a long system replacement

No problem with that, but I look for permitted options

ASME B31.3 Replacement project Burn through The joint was completed 8" 8.18mm and 12" 12.7mm

I would appreciate it if you could inform me whether it is allowed to repair a root defect in an 8" and 12" pipe welding joint from inside of the pipe by chipping off the defect and welding the root pass again. Thanks

Hello I would like to know whether the standpipes are considered part of the pressure vessels. Additionally, I wonder if there is any reference for that in international codes/standards?! Thank you for your contribution. Best regards,

See these photos

The pressure 1900 psi done to the body with fully opened ball Seat test was MWP for Class 600 X 1.1 as per API 598 However, do you think it is a good practice to function test the ball (opening/closing by the actuator at a pressure around 450 psi?

Hello, I would like to know if it is allowed/recommended to leave the weld build-up of limited pits of the Tank Bottoms or they shall be ground smooth? Which is better? and Is Visual and Dye Penetrant Examinations are enough for their inspection? Thanks

It was great post with a lot of information, so, thank you. However, can you please explain more on the special tools needed to put and retract the back seats? BR

Hello, I wonder if it is a common practice or a recommended way to weld the seat rings and pull them to remove the ball from top-entry ball valves?! Is there any better alternatives? Thanks

mostly external corrosion due to CP absence with scattered internal pits But, do not you think that by using a geomembrane under the new Tank floor will contain any leak?

I am sorry but I am studying two options: Floor replacement by removing the old bottom and annular plates and replacing them after having new soil combined with a geomembrane and CP protection, or using what you refer to at API 650 Annex I [Figure I.5—Double Steel Bottom with Leak Detection...

I am seeking your help in comparison between choosing the single bottom with geomembrane liner and CP protection; and the double steel bottom with leak detection and CP protection for the replacement of a Crude Oil Surge Tank floor replacement with reference to the International Standards...

The seats are Double Block and Bleed The pressure was depressurized after the body test

The crack was at the upper side of the ball and we have recently discovered a tiny crack at the center (does not extend to the sides) of the lower part of the ball. I have attached the valve sketches The latter pressure value was requested by the partner Company where the valve was to be...

Thanks for your feedback I have attached a video for better understanding of the crack location where the ball is not dismantled yet. The valve has seat rings (F316) with seal rings (Lauramid). According to API 598, the test pressure was calculated in accordance with the valve rating @ 38...

Valve Data: Borsig Ball Valve 36" ANSI 600 RJ Type: Trunnion mounted/Top Entry Process Fluid: Gas Operating Pressure: 490 psi Max. Allowable Working Pressure: 830 psi Max. Allowable Working Temperature: 110 Degrees Celsius Ball & Seat Rings Material: F316 Year Built: 1977 Test Pressure: 2175...

Thanks for your contributions The Exchanger will be installed in North Africa (Libya) where both codes are acceptable. Is it right that PED is more stringent than ASME?