Looks similar to the drafting standards used for Nuclear construction. That's what I'm used to having and drafting to. Then to come out into engineering and construction for oilfield, refinery and chemical plant - man are they slack!! Never seen such a mess. Many companies don't even know drafting standards exist much less that they should be followed.
Ok I'm climbing down from my soapbox now....getting some dark chocolate....yes.... I feel much better now.