Which is best for P/L valve - DHV bolted body ball valve verses Cameron T31 welded body ball valve?

[flytyer4950]

I have a client looking at bolted verses welded body valves for pipeline valve service. Specifically DHV . Cameron(T31?) and WKM manufacturers . Need a double block and bleed valve is a requirement.

 

[BFZHA]

According to my short experience in pipeline projects, there are not only advantages in the use of fully welded valves because in case of problems such as blocking ball due to lack of valve maintenance , or damage of the seats or even of the ball, the repair operation may be heavy and very expensive: it can require repatriation of the valve to the manufacturer shop.

On the other side, when using split body valves, a leak from body flanges can occur. Consequently, one must have a continued and vigorous monitoring of facilities. Repair is not so difficult but still requires testing of the valve after replacing seals.

In my humble opinion, the use of welded body valves will be limited to underground valves and difficult access facilties. Where it is easy to carry out checks it is more interesting to use split body.

Regards.

 

[LittleInch]

Not much to go here.

Type of valve?
Pressure rating?
Buried?
Fluid?
Toxic?
Valve code?
Pipeline design code?

Will all have an impact on bolted or welded type.

For many pipeline valves, you would need to drain the pipeline to remove or repair any valves so the bolted vs welded issue can become more a preference than any strict technical issue

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[LittleInch]

Also do you really mean DBB or DIB? Big difference and DIB is difficult to get with a ball valve.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.