After going through this, I have found that,
Kirpan is allowed to be carried in public if it meets the following security criteria:
1) The blade should not be more than 6 inches
2) The blade should be blunted or dull
3) It is to be sheathed at all times, and not openly displayed
Is kirpan allowed in Singapore MRT, if all the above rules are followed?
Is it necessary to explicitly declare it while security checking?