Fulton Hopkins (HPN) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 29)

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SECTION 2
HPN-IOM-2014-0416
INSTALLATION
2-23
FIGURE 12 - GAUGES
 Valves
Adhere to the following for valve installation:
1. Use vent and drain valves that normally are 1/2” or 3/4”
with internal seals made from materials suited to use
with thermal fl uids. They may be of the screw type if
installed on stalks not less than 12” (30.5 cm) long.
2. Use gasketing material specifi cally suited to the task.
3. Fit drain valves at all low points in the pipework
system and ventilating valves at all high points in
the installation. Valves must be fi tted with either the
conventional packed stuffi
ng box seal or a bellows seal
as required.
4. Where the stuffi ng box is specifi ed, it should be as deep
as possible and packed with Grafoil packing or equal.
The valves should have a backseating to allow re-
packing without draining the system.
5. In all units, install a “Y” type strainer in the fl uid return
line, between the deaerator tank and the circulating
pump. This strainer is provided on all skid-mounted
units. Valves must be provided (unless the heater has
been skid-mounted with the tank) so that the strainer
can be isolated for cleaning of the element. The strainer
element should be 60 mesh and must remain in place
during normal operation of the system.
6. Check the pump suction pressure periodically, under
similar operating conditions. A vacuum reading on
the suction gauge indicates that the screen must be
cleaned. For isolating purposes, globe, wedge, gate,
ball, or other shut-off valves should be used. When
there is a likelihood that some manual balancing will be
required, a ball or globe valve should be used.
7. Ensure manual control and isolating valves are of
the fl anged or weld type, manufactured from cast or
forged steel or ductile iron, with internals and gland
seals made from materials suitable for use with high
temperature fl uids.
8. When ordering valves, obtain the maximum possible
service temperature and type of fl uid. A partial list of
manufacturers known to market valves of acceptable
quality follows:
 Stockham Valves and Fittings Company
 Velan
 Vogt Machine Company
 Worcester Valve Company
 Automatic Fluid Control Valves
Because of the widely varied processes in which Fulton
Thermal Fluid Heaters are used, it is not possible to provide
specifi c rules for the selection of automatic fl uid control
valves. Generally, these valves must satisfy the specifi c
materials and construction requirements.
The type of operation and design of porting are governed
by the degree of control required as well as the particular
application.
 By-Pass Valves
When process fl ow requirements do not match heater fl ow
requirements, a by-pass valve must be installed. If the process
fl ow will vary with the system load, a suitable bypass system
can be recommended by Fulton.
Assembly of Fulton Multi-Skid
Engineered Systems
Adhere to the following for multi-skid engineered systems:
1. Refer to the Fulton mechanical/electrical drawings
during assembly.
2. Ensure that the equipment orientation allows for
operation interface and maintenance.
3. Align skids as shown in the drawings, ensuring that the
skid fasteners are matched.