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the solid plugs on the vessel body

the solid plugs on the vessel body

the solid plugs on the vessel body

(OP)
hi,the vessel I talking about is a natural gas huge filters , so I found some filters in my network were supplied with solid plugs with sizes vary from 1/4 to 2 inches installed directly on the vessels bodies(specialy the old types) It may be used as alternative access ,should I install a small valve before them or I can leave them as they supplied until they may be used

RE: the solid plugs on the vessel body

A small valve without real purpose involves the risk that someone will open it. People like to touch and press everything they can. So, leave the plugs in if you don't need them.

RE: the solid plugs on the vessel body

(OP)
thank you micalbrch for attention, so please I have a related question , is there any dangerous can these plugs make , If they in good conditions and tightened by they proper torque values, and is there any HSE arrangement require to isolate them by valves , thank you in advance.

RE: the solid plugs on the vessel body

To answer these questions is not only difficult but also dangerous without knowing more about your vessel like design code, pressure etc. Can you provide a photo or a drawing, too?  

RE: the solid plugs on the vessel body

(OP)
hi, these vessels designed based on ASME boiler and pressure vessels code VIII , and their MAWP about 100 barg , I will sent you more detailed information and photos.

RE: the solid plugs on the vessel body

(OP)
hi and Merry Christmas for all, I'm sorry for being late, I Know most of members will be in holiday now, so I Attached some photos to clear my vessels and the solid plugs I Talking about, and as I said before, these vessels designed based on ASME boiler and pressure vessels code VIII , and their MAWP about 100 bar, I wait for your answer, thank you in advance.

RE: the solid plugs on the vessel body

I can't open the attachment. My computer blocks that site.

RE: the solid plugs on the vessel body

(OP)
ok micalbrch , i will upload them by other uploading site, thank you for keeping interest with me.

RE: the solid plugs on the vessel body

arabmechnengineer,

Just post your pictures one at at time. Not everybody can open download sites.

What you have is a pipe welded to the vessel. The end of the pipe is threaded with a coupling. The other end of the coupling is threaded with a square head plug. Are you finding some leakage around them?

RE: the solid plugs on the vessel body

(OP)
there is no evidence of gas leakage more than that, these plugs checked periodically by gas leak tester and the plug tightened very well by the supplier of the vessel and needs high torque to be removed and needs also the vessel to be depressurized, but our HSE fellows insists that these plugs make a potential dangerous without valves before them , by the way theses vessels is a natural gas filter so it's contain a high pressure natural gas with MAWP about 100 bar, please give me your opinion , is there a real dangerous so i must remove the plugs and install a valve with appropriate fitting then reinstall the plug , or what , thank you in advance

RE: the solid plugs on the vessel body

I must confess that I'm not familiar with the ASME regulations. So, I cannot tell you what ASME requires.

I do not see why it is dangerous without a valve. It is easier to open a valve than to screw out the plug. For the plug you need a tool, for a valve you just need a hand unless the lever is removed. In any case you must make sure that nobody opens the plug (or the valve while) the vessel is under pressure. An instruction plate with a corresponding warning is definitely not wrong.

Once again check the ASME requirements (if any).

RE: the solid plugs on the vessel body

(OP)
thank you for answering me , I will take the advice and searching ASME to check its requirement - if any - thank you again.

RE: the solid plugs on the vessel body

There is no prohibition in ASME for the type of nozzle with threaded coupling and plug that is in your photo.

To make your HSE folks happy, I would install a threaded valve using a Schedule 160 nipple, and put the plug into that valve.  The other good alternative is, if this nozzle never gets used, to weld up the threads amd make it a solid piece.

RE: the solid plugs on the vessel body

(OP)
thank you Duwe6 , I will introduce these suggestions to my managers

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