Can anybosy guide how to se bolt selection based on temperature?....i can think of two options...
1. Have two specs with different bolting based on temperature
2. If possible, have an extra TEMP column in the bolt header of the spec. I did try this but doesn't seem to work....Has anyone ever tried or is this even possible?
When using these headers no bolts are output...error msg says 'No answere for Question 'TEMP'
I do not think the temperature route will work.
However I notice that the bolts have different BSEL settings.
I think you could Utilise this to make your selection. Give this a try:-
In DESIGN Set the BSEl attribute of the joint components
For temperatures 5 - 200 set the BSEL of components to B
For temperatures 201 - 400 set the BSEL of components to BA
Both flanges, plus any connected flanged components, (Valve, Instrument, Filter etc.) will require the Bselector value setting.
Wafer type components, (slip blinds, spacers etc.), may be ignored.
Well i tried using the temp column in spec with v11.6 and v12.0...and it seems to work fine.....we were earlier trying to test on 11.5 and it doesn't seem to support this function.....
but am still wondering how do ppl handle bolt lengths for different rating flanges in one spec WITHOUT going to the hassle of designers setting the BSEL attribute in design n all...anyone?
No matter which bolting method you use, mixed ratings in the spec is not a problem since you cannot mix them in any given joint.
In the old system each flange is assigned a particular bolt and bolt length in the pipe spec via the boltref. Isodraft takes 1/2 the bolt length from flange 1 and 1/2 the bolt length from flange 2 plus any wafer items in the joint and adds them together. It then finds the nearest matching length from the NSTD table.
In the new system the flanges are not assigned particular bolts in the pipe spec. Instead it uses the boltsets assigned to the flanges in the catalogue to calculate a length, then adds on the wafer fittings and gaskets. It then finds the highest priority BTYP in the joint and accesses this in the bolt spec for the correct diameter. From here it gets the boltref and then finds the nearest matching length from the relevant LTAB.
The use of the BSEL is to direct Isodraft to a particular bolt when all else is equal. In most projects this does not occur very often, if at all.
I've seen similar problems with fiberglass pipe.
Some brands have a larger pipe OD.
To the point that the washers on the bolts must be a smaller OD.
So some flange sets will be CS to CS, others FG to FG, and still others CS to FG.
The only thing I could find to work was to create seperate SCOMs and SPCOs.
We used STEX on the Iso MTO, and RTEX to identify the flanges crearly for the pipers to "choose" the one they needed.
Worse case scenario, three different bolts are required. X = CS to CS, Y = FG to FG and Z = CS to FG.
For CS flanges create a boltset with the BTYP of each BLTP set to BOLT
For FG flanges create a boltset with the BTYP of each BLTP set to MACH
In the bolt spec
Create a bolt: bolt X BTYP = BOLT BSEL = DEF
Create a bolt: bolt Y BTYP = MACH BSEL = DEF
Create a bolt: bolt Z BTYP + MACH BSEL = MIX
In DESIGN create pipes as normal except where there is a CS to FG joint set the BSEL of all members of the joint to MIX
When isodraft encounters a CS to CS joint all BLTPs will point to BTYP BOLT and therefore bolt X will be selected. Because no BSEL is set at the joint BSEL DEF (default) will be used
When Isodraft encounters an FG to FG joint all BLTPs will point to BTYP MACH and therefore bolt Y will be selected. Because no BSEL is set at the joint BSEL DEF (default) will be used
When Isodraft encounters a CS to FG joint the BOLT BLTPs of the CS flange will be superseded by the MACH BLTPs of the FG flange. Bacause BSEL at the joint is set to MIX, then the MACH bolt in the spec with BSEL MIX, bolt Z, is selected.
This is using BTYP as an STYP not a particular type of bolt and BSEL is effect a sub-STYP. In fact in the case outlined all bolts could be studbolts.
Generally, if we put the gasket in the spec where we need bolts, the bolt material comes from that spec, for example for an CS-SS flanged joint, the bolt should come in SS, but in some cases its not comming... for the same SPREFs.
