Question:

The output file "TRACE.$$$", used during DAMSTAB calculations contains some data which is not clear to interpret:

tank0.c Y= 999.99, Z= 0.08 FLOODED tank1.c Y= 999.99, Z= 0.07 FLOODED tank2.c Y= 999.99, Z= 1.76 FLOODED

what is the meaning of Y and Z ?

Answer:

Y and Z are transverse and vertical bulkhead locations as adjusted for the purpose of determining whether the tank should be flooded in the present case.

Taking as examples the cases from the trace file submitted:

>Damaging division 9 WBH= 8.00 Inbd: 0 > HBH= 6.85 Uppr: 0 > BW-6BW.S Y= 10.16, Z= 0.08 FLOODED > BW-6BC.S Y= 4.27, Z= 0.07 > BW-5TK.S Y= 10.66, Z= 1.76 FLOODED > C-HOLD.C Y= 6.67, Z= 1.76 > C-GARAGE.C Y= 10.67, Z= 7.23 > Predominant flooding side is Stbd

The above case is without inboard (Inbd: 0) and without upper (Uppr: 0) penetration. It can be seen that BW-6BW.S is flooded because it's Y is at 10.16 which is greater then 8.00, the wing bulkhead location. However BW-6BC.S is not flooded because Y=4.27 which is inboard of 8.00. C-GARAGE.C is not flooded because Z=7.23 which is above the 6.85 deck level.

> Damaging division 9 WBH= 0.00 Inbd: 1 > HBH= 6.85 Uppr: 0 > BW-6BW.S Y= 999.99, Z= 0.08 FLOODED > BW-6BC.S Y= 999.99, Z= 0.07 FLOODED > BW-5TK.S Y= 999.99, Z= 1.76 FLOODED > C-HOLD.C Y= 999.99, Z= 1.76 FLOODED > C-GARAGE.C Y= 999.99, Z= 7.34

In this case there is no protection from the wing bulkhead and the side penetration is complete. Therefore all tanks get flooded unless they have a Z value above the 6.85 level.