Engineering manual - SAB 355 Screw compressor unit (including ATEX)
004100 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 that are under the influence of gas pressure must be pres-
sure 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 17 shows the standard pressure levels used by Johnson Controls Denmark. In case of spe-
cific applications, the authorities may, however, demand a higher test pressure level. Within cer-
tain limits, such requirements can be met for Sabroe compressors - at an additional price. Please
contact your local Johnson Controls 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 performed with air. Afterwards, the
leak test is carried out, also with air, at the prescribed pressure and with the component soaked
in a water basin for 30 minutes.
Units consist of components that 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 performed with pressurised air at the pressure stated in the table. All weldings and connections
are covered with a frothing liquid, which will start foaming if there is a leak.
Standard test pressure levels
Compressor
type
Compressor side
Strength
testing
Leak testing with
pressurised air
bar
[psi]
bar
[psi]
SAB 355
The entire compressor block
40.3
[566]
28
[377]
Compressor
unit
All types
The entire unit
7
[102]
Table 17: Test pressure levels
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