Masoneilan 84003 Series SteamForm Installation Guide | 13
Copyright 2020 Baker Hughes Company. All rights reserved.
D
Figure 10: Vertical flow down inlet
orientation. drain should be located at
low point of SteamForm valve body.
D
Warning:
Failure to install a condensate drain at all piping low points can result in flashing and water hammer
damage to the SteamForm valve and surrounding system.
Warm-Up and Preheating Steam
SteamForm valves that are designed for intermittent
operation, such as turbine bypass applications, can be
installed with a warm-up system to minimize the effects of
thermal shock on the valve body and downstream piping.
Thermal shock can occur when the valve sits idle for long
periods of time and is instantly shocked when full load
conditions of high temperature steam are forced through
the valve upon an upset condition, such as a turbine trip.
These thermal shock scenarios occur when the steam
conditioning valve is mounted farther than ten feet away
from the main header. In this case, heat transfer to the
valve is reduced making it possible for the valve body to
cool to a large temperature differential compared to the
live steam passing through it. To counter this condition,
the SteamForm can be designed with warm-up bypass
connections to allow a minimal amount of live steam to
flow through the valve body and maintain a consistent
heat level at all times during non-operation of the valve.
By bleeding small quantities of steam from an upstream
source, such as the main header, the possibility of
thermal shock on the valve and system can be greatly
reduced.
Figure 11: Horizontal inlet and horizontal outlet
orientation, drain should be located at low point
of SteamForm valve body.
