1" Hub Ended Globe Valve 1

[Johnrem]

Dears Specialist;

I have to purchase a 1" Globe Valve, 450 Bars Hub ended, designed to 450 bar for (-35°C to 170°C), RB, OS & Y, Press Seal Bonnet, Metal Seated.

I have to dictate to Suppliers which standard is applicable but I don't have any idea.
I know that face to face dimension of such valves is Manufacturer’s standard, but what about other aspects of design and construction of such valves.

Shall I specify British Standard BS 5352 or BS 1873 or another one?

Many Thanks

 

[rneill]

What is the design code for the piping system, it will likely provide a list of acceptable component standards (including valves). You will likely need to purchase a butt weld end valve that has a hub attached by welding.

You will need to specify the type of hub connection (graylock, tekloc, etc.). Different hubs from different manufacturers may not be compatible with each other. You need to be consistent through the whole facility.

 

[Johnrem]

Rneill;
Thank u.

The applicable code for the piping system is B31.3.
The valve shall be Hub ended not butt welded and Hubs shall be exclusively Galperti type (client requirement).

I checked B31.3 code and I didn't find any British standard for valves inside this code.
Under such result shall I understand from your explanation above that I shall never make reference for BS valves since it is not listed in the code?
If yes, all our piping material specification classes shall be modified given that almost are under B31.3 code and making reference to BS 1873 or BS 5352?

 

[rneill]

API 602 covers 1" globe valves but only up to Class 1500. API 600 covers only gate valves.

Consequently, I think you are left with ASME B16.34 which is a generic valve standard and does not specifically cover globe valves. Myself, I would order a valve certified as compliant to ASME B16.34 and which complies with the applicable requirements of API 602 (e.g., trim codes, etc.). I would probably mandate a welded bonnet with API Trim #5 (full hardfacing) for general hydrocarbon services although it sounds like the client wants a pressure seal bonnet. I don't think I would bother with a pressure seal bonnet in a 1" valve.

I don't think you understood my comment on the hub ends. I think it extremely unlikely that any manufacturer can provide a forging which includes both the valve body and the hub ends. In a case like this, it is more typical that the valve supplier will take a standard butt weld end valve and they will attach the hub ends that you specify by welding and then they will ship you a valve which meets your requirements but it will not be a one piece forging - it will have been assembled by welding.

 

[Johnrem]

Many thanks Rneill;

But are you sure that API602 covers globe valves?
API 602 that I have is titled "Compact Steel Gate Valves-Flanged, threaded, Welding and Extended Body Ends" and in the “Scope” paragraph it is speaks only about gate valves.

I don't know if it not allowed attaching Vendor document into this forum otherwise I will attach it for you and you can see that the vendor proposed forged body in one peace with hub ends.

I agree with you that B16.34 can be a reference but I'm worry it's not enough.

 

[rneill]

You are using an old out of date copy of API 602. If nothing else, you can use the website listed below to research and find information on current versions of industry Codes and Standards.

As I mentioned, even the current copy of API 602 does not cover globe valves with a class rating higher than Class 1500 so the valve can not be certified to it. However, it does provide useful reference information as it specifically covers globe valves whereas ASME B16.34 does not have such specific information on globe valve design and construction requirements.

I would recommend that you purchase current copies of the basic codes and standards that you need to perform this sort of work.

http://www.techstreet.com

If the vendor can supply a single piece forging with hub ends incorporated that is preferable to attaching the hub ends by welding. This is not typical and I assume this means it will be a special order valve.

 

[Johnrem]

Thanks too much Rneill...Your advices are very helpfull...
I got few pages of new version of API602 and I confirm what you said above.
I'll request our QA/QC manager to buy new version of this code.

You didn’t say anything about British Standard BS5352, why?

 

[rneill]

I have no experience with BS5352 (nor do I have a copy) as I am always working with ASME Design Codes and it is not a listed specification within ASME B31.3.

However, I believe that API 602 is basically the same as ISO 15761 which is probably the same as BS 5352.