Carrier 30H - Manual (Page 12)

Tube Plugging — A leaky tube(s) can be plugged
until retubing can be done. The number of plugged
tubes
determines how soon the cooler must be
retubed. If several tubes require plugging, check
with your local Carrier representative to find out
how
the number and location will affect unit
capacity.
Figure 12 shows an Elliot tube plug and a cross-
sectional view of a plug in place. Table 7 lists the
components for plugging.
C.MJ I'lON; Use extreme care when installing
plugs to prevent damaging the tube sheet sec­
tions between the holes.
Clean parts with Loequie “N” and apply a few
drops of Loctite #75 to obtain a tight seal without
using too much force to set the pin.
Usually plugs can be removed by heating the pro­
jecting end of the pin to approximately 1000 F and
chilling quickly with water. Apply the heating
flame to the side of the pin to prevent overheating
the tube sheet.
Retubing (see Table 7) — When retubing is to be
done, obtain the service of qualified personnel,
experienced in boiler maintenance and repair. Most
standard
procedures can be followed, except that
for the tubes in the ЮНА coolers, a 5% crush is
recommended in setting torque control (5/8-in.
diameter tubes are used in these coolers).
Example;
a. Tube sheet hole diameter......................................... 630 in.
b. Tube OD ................................................................... 625 in.
c. Clearance (a minus b)...............................................005 in.
d. Tube ID before rolling
(Use Elliot tube gage)................................................551 in.
e. 5% of twice the wall thickness
(5% of b minus d)..................................................... 004 in.
f. Tube ID after rolling
(c + d + e)................................................................... 560 in.
Table 7 — Plugs and Tubes
UNIT зон
PLUGGING
For Tubes
Brass Pin
Brass Ring
For Holes without Tubes
Brass Pin
Brass Ring
Loctite
Loequie
040 050, 060
PART NUMBER
853103-500*
853002-559*
853103-1*
853002-631*
No. 75f
"N”t
TUBE DATA
Part No.
Length (in.)
OD (in.)
Wall Thickness (in.)
Plain End
Finned Section
SPECIFICATION
10HA501043
74.50
0.625
0.037
0.025
10HA501053
85.50
0.625
0.037
0.025
*Order directly from Elliot Co.
Lagonda Operation
Springfield, Ohio
fCan be obtained locally.
Tightening Cooler Head Bolts
GASKET PREPARATION
When reassembling, use new gaskets. Com­
pressed asbestos/neoprene gaskets. Carrier
Material Specification ZAOO-24, are to be momen­
tarily dipped in compressor break-in oil prior to
assembly. Gaskets are
not to be soaked in oil as
gasket deterioration results. Dipped gaskets are to
be used within 30 minutes to prevent deterioration.
BOLT TORQUES
The following torques are to be applied during
the bolt tightening sequence described below:
5/8-in. diameter flange b o l t s . . . . 150 - 170 Ib-ft
1 / 2-in. diameter center-stud nuts and
1 / 2-in. diameter flange bolts....................... 70 - 90 Ib-ft
TUBE SHEET
>0 A
Fig. 12 — Elliott Tube Plug
12