68 | INSTALLATION, OPERATION and MAINTENANCE MANUAL
13.2. Power Tightening Equipment
Pneumatic Wrench
To facilitate the closing and tightening of large heat exchangers or plate heat
exchangers containing a large number of plates, pneumatic tightening wrenches (single
or dual wrenches) are available in two models. Table 2 shows the pneumatic power
tighteners recommended for small heat exchangers with port opening <= 6 inch and
large heat exchangers with port openings > 6 inch. Table 3 gives a description of each
tightener model. Other compatible or equivalent pneumatic power tighteners may be
substituted for the models shown in Tables 2 and 3.
The power tightener assemblies require clean lubricated air at a minimum of 90 psig at
the filter-regulator inlet. Air consumption is 25 scfm full load or 40 scfm no load for each
tightener.
PORT SIZE
SINGLE
PT-5
DUAL
PT-5
SINGLE
PT-7
DUAL
PT-7
GPHE with <= 6 in. port opening GOOD BEST
GPHE with > 6 in. port opening GOOD BEST
Table 2: Pneumatic wrench recommendations
TIGHTENER MODEL DRIVE SPEEDS WEIGHT (EACH)
PT-5 1”
1 FORWARD
1 REVERSE
27 kg (60 lb.)
PT-7 1-1/2”
2 FORWARD
2 REVERSE
36 kg (80 lb.)
Table 3: Tightener data
Hydraulic Tightening
Hydraulic tightening equipment may be used in lieu of the pneumatic wrenches for
closing and tightening of large heat exchangers and is recommended for heat
exchangers with port openings >= 8 in. The hydraulic tightening equipment increases
the closure increments, thus reducing the amount of time to close large heat
exchangers. Contact the factory for detailed instructions.
13.3. Safety Screen
A safety screen may be supplied for new or existing plate heat exchangers. They are
recommended whenever corrosive liquids or high temperatures present a safety hazard
to personnel near the heat exchanger. The safety screen is made from folded stainless
steel and is hung on the top bar or tie bars of the plate heat exchanger for easy
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