Questions & Answers

Answer from Werner Sölken

Bonjour Nidal,

Yours and compliments from other visitors gives me the impetus to continue with my website; thanks for that!

The reference to "Stud Bolts General" is restored.

greetings Werner

Answer from Werner Sölken

Hi James,
I mentioned earlier that I have no preference for spectacle blinds.
Wherever a spectacle blind, can not rust, it's ok for me, but still, I see no advantage to using Spectacle Blinds.

A surface treatment for Spectacle Blinds, I do not know. Maybe the grease which is used for the bolts, can prevent corrosion.

greetings Werner

Answer from Werner Sölken

Hi Vladimir,
...centerline rule for flanges, understood and followed by all responsible equipment manufacturers and piping fabricators, is my answer on Bolt Hole Orientation .

Norwegian Standard (NS) Flanges, probably tells you nothing about Bolt Hole Orientation, because it is not a official appointment.

Simple, take two flanges NPS 2 class 150, where one hole, on both flanges, is at the top, and then install a standard NPS 2 class 150 gate valve...tell me, in which position is the hand wheel?

greetings Werner

Answer from Werner Sölken

bedankt Lars

Answer from Werner Sölken

Hi Carlo,
Once there was an ANSI B16.5. In 1988 it became ANSI / ASME B16.5, and then, in 1996 it became ASME B16.5

see ANSI B16.5 or ASME B16.5 or both?

greetings Werner

Answer from Werner Sölken

Hi Harold,
The formula is valid for all flange connections.
The basic is the thickness of the flange-plate (h), the height of the raised face (rf) and the thickness of the gasket (g).
These three dimensions you need to know in order to calculate the length of a Stud Bolt.

Other dimensions and notes are given on Calculating Stud Bolt lengths

greetings Werner

Answer from Werner Sölken

Hi Pradip B. Mahadik,
By the way, my name is Werner.

If you apply a reducing Tee, and where the wall thickness of the branch-line is thicker as the runpipe, you should use the wall thickness of the branch-line.

greetings Werner

Answer from Werner Sölken

Hi Pradip B. Mahadik,

see Acceptable Design for Unequal Wall Thickness

greetings Werner

Answer from Werner Sölken

Hi Wali,
My answer is NO.

Class 800 valves are covered in API 602.
Section 1 of API 602 stated "Class 800 is not a listed class designation, but is an intermediate class number widely used for socketwelding and threaded end compact valves."
Also API 602 is applicable to valve end flanges in accordance with ASME B16.5 and valve body "ends" having tapered pipe threads to ISO 7-1 or ASME B 1.20.1.
It is applicable to extended body construction in sizes and pressure Class of 800 and Class 1500, and to bellows and bellows construction as may be adaptable to gate or globe valves in sizes.

greetings Werner

Answer from Werner Sölken

Hi pradeep,

Coincidence? I saw you question on another forum.

The first answer of "gr2 vessels (mechanical)" is premature.
Yes you can use...it's a statement that is baseless.
Both specifications matching things, but are not identical.

The second answer.. Compare both specifications. Composition, strength, application, restrictions, size and availability.
You will see differences in both specifications.

Who takes the decision to deviate from a customer specification?

You or the client?

greetings Werner

Answer from Werner Sölken

Hi pourmarjan,

see Ball Valve and ORBIT valve

greetings Werner