CUT-TO-LENGTH:
Determine proper length. Cut through plastic cover and stainless pipe
using a tube cutter with a sharp wheel. Cut must be centred between two
corrugations. Use full circular strokes in one direction and tighten roller
pressure slightly (a quarter turn) after each revolution. DO NOT OVERTIGHTEN
ROLLER, which may flatten pipe.
STRIP
COVER: Using a utility knife, strip back the plastic cover about 25 mm
back from the cut end to allow assembly of fittings. Caution: Knife blade
and cut pipe ends are both sharp. Use care when cutting the cover and
handling the pipe.
INSTALL
BACK NUT : Slide the back nut over the cut end; place the two split rings
into the first corrugation next to the pipe cut. Slide the back nut forward
to trap the rings.
FIT
AutoFlare® FITTING: Place the AutoFlare® fitting into the back
nut and engage threads. Note that the AutoFlare® fitting is designed
to form a leak tight seat on the stainless piping as you tighten the fitting.
(The piloting feature of the insert will not always enter the bore of
the piping before the tightening operation, but will centre the fitting
when tightened). Using appropriate wrenches, tighten the fitting until
insert bottoms and the resistance to wrenching increases greatly. The
flare has now been created on the piping end.
FINAL
TORQUE : Tighten nut and body as though you were making up a flared tubing
joint. Note the relation between hex flats at this point and continue
to tighten for two additional hex flats (one-third turn) to obtain required
torque and final leak- tight metal-to-metal seal.
Maximum torques for sealing are :
| DN | Torque N.m | Ft.lbs |
| 12 | 65 | 48 |
| 15 | 68 | 50 |
| 22 | 73 | 54 |
| 28 | 122 | 90 |
| 32 | 284 | 210 |
| 40 | 365 | 270 |
| 50 | 447 | 330 |
7.1.6
TAPE WRAP: AFTER GAS TIGHTNESS TEST - Care must be taken after pressure
test to ensure that no stainless steel pipe is visible.
Any portions of exposed stainless steel behind the fitting nut shall be wrapped with self-bonding silicone tape TracPipe P/N FGP-915-10H-12, (25 mm wide), or FGP-915-20H12PO, (50 mm wide). This will reduce the possibility of later corrosive attack.
Any portions of exposed stainless steel behind the fitting nut shall be wrapped with self-bonding silicone tape TracPipe P/N FGP-915-10H-12, (25 mm wide), or FGP-915-20H12PO, (50 mm wide). This will reduce the possibility of later corrosive attack.
