Fulton Ancillary Equipment SteamPac Unfired Steam Generators - Manual (Page 23)

Fulton Thermal Corp.*SteamPac Unfired Steam Generators Manual* Version 2010-0201
Page 23
f) During construction of the installation, ensure that no dirt, water, or residue from welding
is left in the system.
17. Thermal Fluid Pipework
a) The thermal fluid pipework and main body of the generator should be lagged. Leave the
lower flange of the generator free so that the heat exchanger may be removed
periodically if required.
b) All pipework should be constructed from seamless mild steel pipe, conforming to ASME
SA 106B or SA 53A schedule 40 or equal.
c) Expansion joints or properly designed and sited loops should be provided to
accommodate thermal expansion. Thermal expansion should be calculated using the
maximum possible utilization fluid temperature, regardless of whether the pipe
considered is in the feed or return circuit. Steel pipe will expand approximately 1” per 100’
over a 100°F temperature rise (1 mm per meter over 100°C rise).
d) 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
SteamPac. Supports and anchors which will not interfere with thermal expansion should
be chosen.
e) All pipe joints should be either welded or flanged construction. Screwed joints must be
avoided where possible. In no instance should screwed joints be used in the flow circuit.
f) All flanges should be welded to the pipe and not screwed. Flanges should be 150# of
300# raised face flanges, SA105.
g) 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.
h) Ensure that all bolts are tightened evenly and to the torque recommended values
provided by the gasket manufacturer.
i) Gasket Installation Instructions
1. Lubricate nuts, bolts and washers with a graphite/oil mixture.
2. Assure that the flange surfaces are clean and free from damage.
3. Center gasket properly over flange. In retrofit, use pry bar to spread
flange apart enough that then gasket will not be damaged when sliding in
place.
4. Install all flange nuts and bolts.
5. Hand tighten.
6. Utilizing a torque wrench, tighten all bolts to 20% final torque
specification following a “star” pattern. (This means do not tighten bolts in
the order of a clock. This will result in a poor seal
between 12 o’clock and 1 o’clock).