BOLT LENGTH in OLD METHOD

Hi,

i got two problems regarding this bolt method in pdms, i wonder if someone came across the same problem too:

1. Using OLD bolting method, it turns out the Bolt length that appear in the report ( in isometric material list ) is static. It takes its value from SBOL length.
I changed the length value in SBOL and the same value appear in the bolt report. I'm sure this is wrong, but don't have any idea how to solve it
2. In using NEW bolting method, my bolt MTo doesn't appear at all. In the command line it shows something like this:
(61:389) Using NEW bolting method
(42,64)   **** not selected
(61:394) Cannot calculate bolting requirements for joint FLANGE 2....
I've set my pipe spec as it takes for bolting method and pointing it to my separate class of Bolt Spec. But if i change the method to OLD the bolt MTO appear but then again the bolt length value is taken from the Length of SBOL, it seems that PDMS doesn't do the calculating process to determine the Bolt length. Please, someone have ay idea how to solve this????:chief::beer_yum:

Old method works by taking 1/2 length of flange1 boltref + 1/2 length of flange2 boltref + wafer + extra gasket.

Pitch, thanks for the reply.

But it seems that is not what happen.
I change the SBOL length to 1000 and bolt length appear 1000 in MTO
i change the SBOL LEngth to 100 and bolt length appear 100 in MTO
I wonder how to correct this, there must be setting that i missed somewhere:confused_smile:

if you have only one bolt length in the diameter table it goes direct to that figure. pdms goes to the nearest calculated value in the populated DTAD. find example below

NEW DTABLE /BDIA.12.7.L7.1
BLEN (50 60 70 80 90 100 110 120
130 150 160 170 180 )

Abba, hi
My Blength is Blength (55mm 60mm 65mm 70mm 75mm )
My max. length should be 75mm

I find out that the bolt length value is taken from the SBOL length
i tired to make it 0mm and so does what i have in bolt mto.

And also, when i change my SBOL Noff to 0 then my MTO bolt MTO doesn't appear.

From Manual and document that Pitch wrote ( thanks Pitch ) that the amount of Bolt and the diameter of bolt are taken from the Boltset not from the SBOL.
But for my case it takes all from SBOL ( both BDIA and Noff ). I changed the Bdia value in SBOL to arbitrary number and that's exactly what i get in Bolt MTO  (the value converted to inch).

This seems so strange to me, where i went wrong in setting this BOlting ????

while you are at  your SBOL  Q ATT and change attribute 'Nstdblength' to /xxxxxx POINTING TO YOUR DTAB

If I remember correctly, using old method, If you have two standard flanges together then PDMS does not refer to the nstd table. It only looks there if you have something other than a gasket between them ie a wafer fitting.

Thanks Pitch, I have been wondering what could be wrong with his case, hence thought of reference.

Pitch, for my case it only use value from SBOL for Bdia and Noff.
It didn't use the data in the BLTP.

[QUOTE=notiadra29;36654]Pitch, thanks for the reply.

But it seems that is not what happen.
I change the SBOL length to 1000 and bolt length appear 1000 in MTO
i change the SBOL LEngth to 100 and bolt length appear 100 in MTO
I wonder how to correct this, there must be setting that i missed somewhere:confused_smile:

I think you get mix-up with New & Old bolting method.
The 2 Bolt methods are entirely different to each other.

And you said “I change the SBOL length to 1000 and bolt length appear 1000 in MTO
i change the SBOL LEngth to 100 and bolt length appear 100 in MTO”.

Yes if you use Old bolting method, it will do the same as you said. whatever you set in the SBOL that will appear in the isometric.