SPX Cooling Technologies TG MAG86-100 Manual Do Utilizador

48

A.0500.551 – IM-TGMAG/02.00 EN (02/2008)

3.21.7  Designation of threaded connections.

To make clear what sealing type of threaded connection is provided we denominate them according 
to standards ISO 7/1 and ISO 228/1 as follows.

If no flattened sealing face is provided we call the connection Rp according to ISO 7/1.
This connection has to be sealed in the thread.
The plugs or pipe connections must be provided with conical thread according to ISO 7/1 external 
thread (example ISO 7/1 - R1/2).

If the threaded connection is provided of a flattened sealing face we call it G according to ISO 
228/1.
This connection can be sealed by a gasket. The plugs or pipe connections must be provided with a 
sealing collar and cylindrical external thread according to ISO 228/1 (Example ISO 228/1 - G1/2).
Plugs or pipe connections provided with conical thread according to ISO 7/1 external thread  
(example ISO 7/1 - R1/2) can also be used.

Internal
thread

Cynlindrical (parallel)

Rp

ISO 7/1 – Rp 1/2

External 
thread

Always conical 
(tapered)

R

ISO 7/1 – R 1/2

Conical plug
ISO 7/1 - R 1/2

Conical pipe end
ISO 7/1 - R 1/2

Internal
thread

Only one class

G

ISO 228/1 – G 1/2

External
thread

Class A 
(standard)

G

ISO 228/1 – G 1/2

Class B 
(extra clearance)

G...B

ISO 228/1 – G 1/2 B

External
thread

Always conical 
(tapered)

R

ISO 7/1 – R 1/2

Plug with collar
ISO 228/1 - G 1/2

Conical pipe end
ISO 7/1 - R 1/2