How to get Butterfly valves to match flange types

[Swedishrigpig]

Gents

I am looking through my vessels pipe line drawings.
The valve I need should be:
VA BUTTERFLY 150 PSIG LUG TYPE DI-BODY ALUM BRZ. DISC. 316 STEM BUNA-N SEAT
NOM SIZE 4”

But when I look at the valve installed (original one)
the data looks different:

The sign says:
Tag No: WSC 501
Fig: 2 DLES088
DN: 100mm
PN: 1030kPa
End connection: A150

The flanges we use are: ANSI B16.5

My question is: Since it is a lugged valve the bolt pattern is critical to align with the flange bolt holes. The drawing clearly looks like American ANSI standard. Yet the valve has all Metric data, are the two things the same?
Can I use either one to order new valves?
Can I attach both data or are they contradictory, will I confuse the supplier?

Best regards,

Rigpig

 

[rneill]

The lugged valve should have a bolt pattern and facing compatible with the specified flanges. The description you provided is for an ASME B16.5 Class 150 faced valve of size NPS 4 (nominally, 4").

The sign appears to be in metric and is saying the size is DN 100 (equivalent to NPS 4) but then says PN: 1030 kPa. PN designates a "Pressure Number" as described in the European ISO standards. The ISO equivalent to ASME Class 150 would be PN 20. An ASME Class 150 and a PN 20 flange have the same dimensions.

Since the sign does not say PN 20, which would be the correct reference, I suspect that they are indicating that the valve has a rated working pressure of 1030 kPa (150 psig) rather than suggesting the facing dimensions. The "A150" is most likely intended to suggest ASME 150 facing dimensions. The fig. number listed on the sign is going to be the specific manufacturer's model number and materials breakdown code which will not mean anything to anyone other than the supplier of that particular valve.

Regardless, the installed valve is most likely a DN 100, PN 20 valve which would be equivalent to NPS 4, Class 150.

You should not have a problem ordering either:

1) ASME Class 150, NPS 4, ....
2) PN 20, DN 100, ...

In either case you would have to provide all the materials information you mentioned in your original description since the figure number probably won't mean anything to anyone other than the supplier of the original valve.

 

[europipe]

Measure the connecting flanges and You will know if it's din or ansi.
I presume it is a din valve bored to 4"-150#.
Greetings

 

[europipe]

btw, mostly the flanges are stamped.

 

[katmar]

I suspect the existing valve is manufactured to ANSI dimensions and has been "metricated" in its on-plant labelling. This is not uncommon in metric countries where ANSI equipment is used. No valve manufacturer would label a valve PN 1030.

The best way to tell the valve class is to measure the bolt PCD - this is easy if you have a lugged valve. A 4" ANSI 150 flange has a PCD of 191 mm (7.5 inch) while a PN 10 valve would have a bolt PCD of 180 mm.

Katmar Software
Engineering & Risk Analysis Software

http://katmarsoftware.com

 

[Swedishrigpig]

Katmar

That would make sence, the shipyard that build the vessel might have altered/replaced the label.
Measuring the valve is not so easy right now, as it is mounted on the sea chest. I could do it, but we would sink then.
Will get some divers to plug it and take the measurements.

All your input gents, are much appreciated.

Rigpig

 

[eadwine]

The valve installed is a Euro Manu'f. valve based on the manu'f. valve "Data Tag". DN 100 translates as 100mm valve - 3.937" close enough to 4". End Connection: a150 indicates ansi class 150#. pressure 1030 kilopascals (I'll let you do the pressure conversion). As for the rest of the information on valve type, body material, disc, stem, and seals this is tied up in the manuf's. fig.no. and catalog data for that fig.no. Also, the tag no. WSC-501 refers to the valve number in the owners spec. system. There ought to be a "Data-Spec sheet" lying around somewhere that lists the full assembly details of that valve. Unless IT, in it's infinite wisdom, decided it didn't need to be uploaded into the New computer data base and threw it away years ago.

Hope this helps, good luck.