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Plumbing question: Gate valve - Reef2Reef

Oct. 07, 2024

Plumbing question: Gate valve - Reef2Reef

I&#;m curious to know where the best place to install a gate valve is, if there is one. My drain pipe comes down from the tank, hits 90degrees to go toward the front of the tank, then another 90degrees to go down into a clarisea. I&#;m sure the best place to install the gate valve is on the last piece of pipe that goes straight down into the clarisea, but would it make a difference if it is installed on the first pipe that comes down from the tank before it makes the turns? I imagine it might still make noise if I choose that way because the water is moving so much as opposed to going straight down. Or what about on the horizontal pipe between the two 90degrees?

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Gate Valve installation - Pipelines, Piping and Fluid ...

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Gate Valve installation

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Gate Valve installation

teddyboy

(Petroleum)

(OP)

1 Dec 08 03:07

Hi everyone, Could somebody give me a tip regarding the gate valves on horizontal line with its handwheel at horizontal position. If this arrange will not be of any problem in the future? The applications are for steam and liquid hydrocarbons.

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RE: Gate Valve installation

pennpiper

(Mechanical)

1 Dec 08 07:10

I think you mean "The stem" in the horizontal position, right?
If so then let's look at this in a logical manner.
What if we had a Gate Valve in a vertical line? The Stem would be in the horizontal position would it not?

So if a valve stem in the horizontal position is alright for a vertical line why would a valve stem in the horizontal not be alright for a horizontal line?

RE: Gate Valve installation

BigInch

(Petroleum)

1 Dec 08 07:45

The handwheel might be buried 4 feet underground.

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RE: Gate Valve installation

insult2injury

(Mechanical)

1 Dec 08 08:49

Advise the vendor of the orientation. Often they will hardface the sliding the contact faces of the guides; otherwise, it's the same valve.

I2I

RE: Gate Valve installation

JJPellin

(Mechanical)

1 Dec 08 21:38

In the past couple of years, we have seen a growing problem with broken stems on gate valve. I think the quality of valves coming from some countries is less than it had been in the past. With the stem in the vertical, a broken stem can result in a valve failing closed. With the stem in the horizontal, the valve would tend to fail in place if the stem breaks. You should consider the consequences of these possible failure modes. In some services, a valve that failed closed unexpectedly could cause disaster. If this is the case, I prefer a horizontal stem orientation. Otherwise, it's just a mater of convenience and operator access.

Johnny Pellin

RE: Gate Valve installation

BigInch

(Petroleum)

1 Dec 08 22:29

Interesting point, but I think, if it is truely a 50/50 position thing w/o actuator, I'd rather have a valve fail closed. At least you know you've got a problem then if you run out there during some kind of emergency and try to close it only to find out you can't.

RE: Gate Valve installation

KenA

(Chemical)

2 Dec 08 02:39

BigInch - just so long as that gate valve isn't in the inlet to a PSV!

RE: Gate Valve installation

BigInch

(Petroleum)

2 Dec 08 03:58

That wouldn't be one of those 50/50 situations.

Da.That wouldn't be one of those 50/50 situations.

RE: Gate Valve installation

gmax137

(Nuclear)

2 Dec 08 20:23

Are you guys allowed to put gate valves at the inlet to safety valves?? Or, does "PSV" mean something else?

RE: Gate Valve installation

Zapster

(Electrical)

2 Dec 08 20:31

gmax137, YES unless the latest edition of the BPV code has changed.

RE: Gate Valve installation

Zapster

(Electrical)

3 Dec 08 01:58

I had to take a look at the BPV VIII Div 1 just to remember all of the nuances required for a stop valve. The current version of the code is . I only have at my office and I have inserted the dialog from the version below. The goes into greater depth about the limitations; however they are still allowed. As I stated above, I am unsure about the appendix.

M-5 STOP VALVES BETWEEN PRESSURE RELIEVING DEVICE AND VESSEL
(a) A vessel, in which pressure can be generated because of service conditions, may have a full-area stop valve between it and its pressure relieving device for inspection and repair purposes only. When such a stop valve is provided, it shall be so arranged that it can be locked or sealed open, and it shall not be closed except by an authorized person who shall remain stationed there during that period of the vessel's operation within which the valve remains closed, and who shall again lock or seal the stop valve in the open position before leaving the station.

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