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Minimum distance on start-up steam line

Minimum distance on start-up steam line

Minimum distance on start-up steam line

Hello all,

Good day to you.

I came across a piping system wherein minimum distance is not followed on downstream of isolation valve on start-up steam line. Please go through the schematic for reference.

During normal operation, Isolation valve on start-up steam line will be kept closed and it will be floating on the main steam line which is at around 40 Kg/cm2.

Distance between the isolation valve and the mixing point is around 14 meters. There is a break flange on main steam line.

I'm expecting condensate formation on downstream of the isolation valve and eventual hammering in main steam line. If it is severe, it may lead to damaging the break flange and leaky flange.

Please share if there is any guideline or thumb rule on minimum distance to be maintained between the isolation valve and main steam line.

RE: Minimum distance on start-up steam line

Schematic not attached

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