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Extract from VCI's "Guidelines for flanged connections" Table 6 seal group A, March 2016 edition.
Table 6 – Required tightening torques for fitting flanges in accordance with DIN EN 1092-1 type 11 and fasteners
(e.g. screws, threaded rod) made of 25CrMo4 / A2-70 or similar strength
Thread
M12
M16
M20
M24
M27
M30
M33
M36
M39
M45
M52
These tightening torques have been calculated by BASF SE and confirmed by way of spot checks by the cooperating companies.
a
Recommended lever length 300 mm
b
Recommended lever length 550 mm
c
Note: Flanges made of austenitic steel and ferrite as per DIN EN 1092-1 are isometric.
5
Function test
First flush newly installed piping systems carefully in order to remove all debris.
The locking function of the installed Garlock valve must be checked by repeated opening and closing. The
pressure test of the valves has already been conducted by Garlock.
Please observe the following for the pressure test of a piping system with installed valves:
Valve open:
The test pressure (PT) must not exceed the value 1.5 x (PS) (acc. to type label).
Valve closed: The test pressure (PT) must not exceed the value 1.1 x (PS) (acc. to type label).
If leakage occurs at a valve, follow paragraph 8 < In case of emergency>.
6
Normal operation and maintenance
As the plastic sealing surfaces incline towards the flow it may be necessary, during commissioning and after
reaching the operating temperature, to re-tighten all flange connections between piping and gasket using the
respective torque according to tables in 4.3 Installation.
For manual operation (manual lever / gearing) normal manual forces are sufficient. Using extensions to increase
the operating torque are not permitted.
Tightening torque [Nm]
Seal group A
50
125
b
240
c
340
500
700
900
1200
1400
2000
3000
a
22
Tightening method
With manual spanner
and suitable extension
if necessary
With torque spanner or other
torque-controlled method
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