Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
008831 en 2020.10
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Technical data
6.15.2 Test pressure levels for standard compressors and components
All components for refrigeration plants which are under the influence of gas pressure must be
pressure tested to prove their strength and tightness.
The approving authorities determine the test pressure levels on the basis of various criteria. How-
ever, the test pressure requirements can be summarised into a number of standard pressure lev-
els which in practice meet the requirements set up, and which can therefore be approved by all
authorities involved.
Table 25 shows the standard pressure levels used by Johnson Controls Denmark. For specific ap-
plications the authorities may, however, demand a higher test pressure level. Such requirements
can be met, within certain limits, for Sabroe compressors at an additional price. Please contact
your local sales representative for further information.
When pressure testing compressors and vessels, components must first prove their strength by
resisting the test pressure of the strength test. This test is carried out with air.
Afterwards, the leak test is carried out, also with air, at the prescribed pressure for 30 minutes.
Units consist of components which have been pressure tested as described in the following table.
This means that it is only necessary to leak test the unit. Dwelling time is 20 minutes. Leak testing
is carried out with pressurised air at the pressure stated in the table. All weldings and connections
are covered with a frothing liquid which will start foaming in case of a leak.
Standard test pressure levels
Compressor
type
Compressor side
Strength
Testing
Leak testing with
pressurised air
bar [psi] bar [psi]
SAB 193
SAB 233
SAB 283
The entire compressor block
40.3
[566]
28
[377]
Compressor
unit
All types
The entire unit
40.3
[566]
28
[377]
Table 25: Test pressure levels
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