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battery limit gate valves
2

battery limit gate valves

battery limit gate valves

(OP)
I have several gate valves with the stems pointing above the horizontal plane of the valve body between vessels and pressure-relieving devices, which is not permitted by the California code of regulations.
I was wondering if anyone had this problem before and how where they able to solve it?
I thought about turning the valves horizontally or with the stems pointing downward.
Is there a possibility for liquid to ruin the valves structure or functionality?

RE: battery limit gate valves

"gate valves ...  between vessels and pressure-relieving devices"

Can these valves, if closed, block proper function of pressure relieving devices?  That may be where the code violation is.

Generally, valve stems for manual valves can be in any orientation.  If electrically actuated, having them pointing up can help prevent any leakage or condensation from dripping onto the zappy bits.

RE: battery limit gate valves

(OP)
I'm sorry, I should have been more specific. There is a stop valve (gate valve in this case) between the pressure-relieving device (pretty much a PSV) and vessel. There are many like this throughout the plant.

If the stop valve fails, for some reason, the gate will fall or stay stuck in the pipe, blocking the fluid from going into the main header and pressure relieving device.  

Thanks btrueblood.  

RE: battery limit gate valves

I'm not sure that orientation of the actuator is going to matter if you have a stop valve between the vessel and the relief valve.   

Patricia Lougheed

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RE: battery limit gate valves

By the way, the California Code of Regulations is available online here: http://government.westlaw.com/linkedslice/default.asp?RS=GVT1.0&VR=2.0&SP=CCR-1000&Action=Welcome

Section 8 covers pressure vessels.  It appears that the requirement that is being cited is from 8 CCR 6552(C)(4).   

Patricia Lougheed

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RE: battery limit gate valves

I'm not going to profess any specific expertise in this code nor your specific gate valves nor application; however with regard to your last question, historically I believe not all gate valves have been intended for installation with the gates/stems in all manners of variable clock orientations (you may wish to check into this regarding your specific valves, manufacture and application etc.)    

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