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Dear experts, We need to full blast (remove the existing shop prime 40 micron DFT) to get SSPC 10 standard. The question is : is there any rule of thumb on how many percent garnet consumption to be added comparing to blasting on bare metal. Let say for bare metal we consume 20 Kg of garnet/M2...

Dear Tank Builder, Dome roof tank 31 M dia x 14 M Ht designed as per Annex F with 0.75 psi design pressure. As required by appendix F, the tank must be air tested at 1.25 x 0.75 psi. The question is : is there any rule of thumb or engineering calculation about safe working distance during the...

Dear Tank Builder, IS there any technical reason why we have to maintain 50 mm annular plate outside beyond the shell plate ?

Dear IFRs, Thanks for you comments. In my country , soap solution could be the one that used for wash dishes in the kitchen or the one in bath room. Detergent is a powder the one that used for washing the clothes.

Dear tank builders, API 650 states soap solution to be used as leak detector on vacuum box or air test. ASME Section V article X states using household detergent is forbidden for leak detection. Soap solution different with household detergent ? Any comments ?

Dear Osmanyugun / IFRs, Thanks for the explanation. Syah

Dear Tank Buiders, A tank designed as per appendix F has an internal pressure 0.5 PSI. We have to air tested this tank as required. We are planning to use a water manometer to measure the air pressure above the hydrotest water. From google we have 0.5 PSI = 351 mmH20. Is the above equation...

Dear Engineers, We have 4 bolts on 2" A105 blind flange. The pressure on the blind flange is 30 PSI. The question is how much maximum torque in LB foot or NM or KgfM could be applied to each of bolts. Could we used this equation : 4 bolts = 30 PSI so 1 bolts 30/4 PSI = 7.5 PSI The maximum...

Dear All, Thanks for the response. Yes, there will be a lot of saving since there are a lot of attachments (inside and out side the tank) which is above the design liquid level. Syah

Dear expert, We are constructing a tanks with group V material with over flow nozzle. API 650 5.8.1.1. states permanent attachments above the maximum liquid level are not permanent attachment. Since the tanks have an over flow nozzle so the maximum liquid level will not reach above the over...

Dear IFRs, Thanks for your reply. Syah

Dear Experts, I wonder if the below question have a cross your mind. Our tank is designed as per Appendix F with 1.5 PSI design pressure. The air test pressure is 1.25 x 1.5 = 1.875 psi. Our atmospheric is about 1 ATM or about 14.5 PSI. Does this mean the pressure outside the tank is...

Dear IFRs, Thanks for the response. But by the code it is not mandatory isn't it ? I mean we can keep as it is without relocating the orientation and elevation of the permanent attachments to maintain 6" rule. Syah

Dear Experts, For material group IV and above, API 650 para 5.8.1.1 does not cover the distance between permanent attachment to another permanent attachment nearby. For example, fillet weld the anchor chair's pad and and fillet weld pad plate for vertical ladder are welded to the shell plate...

Dear experts, We have fabricated a lifting lugs / pad eyes for lifting purpose. The weight of the plate to be lifted is about 2 tons. The lug will be welded directly to the plate then removed after the plate is located in the correct place. The question is how many times we can use the...

IFRS, Thanks for the respond. If there is no vertical available but there is horizontal can we ask the new welder to weld the horizontal? Thanks.

Thanks for the respond. Let us say welder A has completed vertical on outside part and he can't continue on inside part. We assign welder B to weld the vertical from inside. Does API 650 has restriction on this case ?

Dear experts, In my understanding this section is intended as a guide how to RT a storage tank or tanks. This mean if we have many tanks even close each other in one project the method of RT is the same. Method of RT meaning how many film to be taken. Nothing has to do with welder...

Dear experts, After discharging the hydrotest water out from our Demineralized Tank, we found that the internal surface of tank bottom and shell are very much dirty. See the attached photos. I am seeking an advise if there is a chemical could be used to clean accordingly. The internal surface...

MJ Cronin and IFRs, Thanks for your response. My concern is there is a pressure inside the tank that need to be maintain for one or some reasons. There is also N2 blanket above the product. If one day the tank operator open this gauge hatch then the pressure will drop to 0 and N2 will come...