Fulton Vertical Electric (FT-N) Thermal Fluid (hot oil) Heater - Manual (Page 31)

Fulton Thermal Corp.*Electric Thermal Fluid Heaters Manual* Version 2010-0423
Page 31
c) Supports and anchors must be provided for all pipes where necessary to prevent undue
stresses from being placed on items of equipment, including pumps, valves, and the
heater. Supports and anchors which will not interfere with thermal expansion should be
chosen.
d) All pipe joints should be of either welded or flanged construction. Screwed joints must be
avoided where possible. In no instance should screwed joints be used in the flow circuit.
e) All flanges should be welded to the pipe and not screwed. Flanges should be 150# or
300# raised face flanges, SA105.
f) Gasketing material suitable for use with thermal fluids at high temperatures should be
used to make all flanged joints. Flexible graphite gaskets are suited for most thermal
fluids. Recommended gasket thickness is 1/10 - 1/8 inch.
g) Ensure that all bolts are tightened evenly and to the torque recommended values
provided by the gasket manufacturer.
15. Gasket Installation Instructions
a) Lubricate nuts, bolts and washers with a graphite/oil mixture.
b) Assure that the flange surfaces are clean and free from damage.
c) Center gasket properly over flange. In retrofit, use pry bar to spread flange apart enough
that the gasket will not be damaged when sliding in place.
d) Install all flange nuts and bolts.
e) Hand tighten.
f) Utilizing a torque wrench, tighten all bolts to 20% final torque specification following a
“star” pattern. (This means do not tighten bolts in order as a clock. This will result in a
poor seat between 12 o’clock and 1 o’clock.)
g) Tighten all bolts to 40% final torque specification following a “star” pattern.
h) Tighten all bolts to 60% final torque specification following a “star” pattern.
i) Tighten all bolts to 80% final torque specification following a “star” pattern.
j) Tighten all bolts to 100% final torque specification following a “star” pattern.
k) Following a sequential pattern, ensure that all bolts are tightened to 100% final torque
specification.
l) It is important that all bolts are checked and re-torqued after flanges have been heated
and cooled down for the first time.