Yesterday I was 1K flying C and an RCC member. Since I was gullibly diverted by a UAL "invitation" to a new Lounge I was unable to test the dragon on the three points the latter of which may not apply or to discover if it was even open though I see no reason why the UAL guy would lie to me!
Royal Silk Lounge at Concourse D, Level 3 – 2,410 sq.m. has been allocated to accommodate 314 passengers.

Opening hours: 05:00 am. – 02:00 am.

Facilities :

2 Private Rooms
Lounge Lobby Bar
Buffet Bar with variety of food, snack and refreshment
Wi-fi Internet Corner with 6 PCs
Kid’s Corner
Toilets with Wheelchair Accessible
Lounge Access:

Royal Silk Class passengers departing same day on TG operating flight
No guest allowed
Business Class passengers departing same day on any Star Alliance operating flight
No guest allowed

http://www.thaiairways.com/thai-serv...ilk-lounge.htm