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  • Users: Syahar1975
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  1. Syahar1975

    Blasting on coated surface

    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...
  2. Syahar1975

    Safe working distance

    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...
  3. Syahar1975

    50 mm projection beyond the shell plate

    Dear Tank Builder, IS there any technical reason why we have to maintain 50 mm annular plate outside beyond the shell plate ?
  4. Syahar1975

    Soap solution and household detergent

    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 ?
  5. Syahar1975

    Appendix F tank - Converting PSI to mmH2O

    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...
  6. Syahar1975

    Tightening the nuts on the bolts.

    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...
  7. Syahar1975

    Permanent attachment clause 5.8.1.1 in API 650

    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...
  8. Syahar1975

    Air test on Dome Roof Tank

    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...
  9. Syahar1975

    Permanent attachment to another permanent attachment distance

    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...
  10. Syahar1975

    Lifting lug / pad eye

    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...
  11. Syahar1975

    API 650 Section 8.1 Method of examining joint

    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...
  12. Syahar1975

    Cleaning a very dirty painted shell and bottom surface of storage tank

    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...
  13. Syahar1975

    Minimum length of shell plate

    Guys, British Standard states 1 M is minimum length of plate. I do not see that requirement in API 650. Does API 650 specify minimum requirement of shell plate length ? Syah
  14. Syahar1975

    Gauge hatch on pressure dome roof tank

    Dear experts, Demineral Water Tank with nitrogen blanket and operating pressure 8 mBar. This tank has 8" nozzle for gauge hatch. Gauge hatch is used for water sampling. I don't understand why 8" gauge hatch is required for this tank. Any explanation is highly appreciated. Syah
  15. Syahar1975

    Roof pneumatic test on Alumunium Dome Roof Tank

    Dear Experts, I am reviewing a tank construction drawings for the next months project. I found in the approved the drawing 2 units 50 M dia. x 20 M Ht Demin. Water storage tank with Alumunium Dome Roof with 3 - 12" PVSV on it. The design pressure is 20 mBar and there is pneumatic test at...
  16. Syahar1975

    Advantages of normalized steel plate A516 Gr. 60

    Dear experts, What is the advantage of normalizing on a steel plate ? Let say I have plate 30 mm A516 Gr. 60 normalized and A516 Gr.60 without normalized. What is the different ? Better tensile strength ? Better toughness ? Syah
  17. Syahar1975

    Grinding flush before or after RT

    Dear Experts, I have seen in my previous projects that a welding seam not need to be ground flush for RT purpose . While in another one was ground flush before RT. Is there any standard or code covering the above issue ? Syah
  18. Syahar1975

    Grinding on a welding seam after Radiography

    Dear experts, Normally there will be a visual check before RT. The AI will give their comments like smooth grind or add another one pass etc etc. Then RT could be proceeded. Now, since the first AI on leave, after RT the other AI request to smooth grind again that weld area. My understanding...
  19. Syahar1975

    PWHT requirement

    Hi experts, Plate A516 Gr. 70 with 20 mm plate thicknesses. By mistake our subcontractor cut the wrong opening location for 24" shell nozzle on 1 shell plate during fabrication at the workshop. The cut out plate they put it back on the opening butt welded and full RT. The result was good...
  20. Syahar1975

    A193 B7 and B-L7 bolt

    Dear experts, The drawing show A193 B7 bolt. The supplier gave me a bolt with B-L7 marking on the head. What is the difference and which is one is better. Syah

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