1. Signa Imperial
Fistula ferri imperialis per caput "Dn" denotatur. Moles includunt DN15 (4-inch pipe), DN20 (6-inch pipe), DN25 (1-inch pipe), DN32 (1-inch 2-inch pipe), DN40 (1.5-inch pipe), DN50 (2-inch pipe), DN65 (2.5-inch pipe), DN80(3-inch pipe), DN100 (4-inch pipe), DN100 (4-inch pipe), DN50 (4-inch pipe), DN50 (2-inch pipe), DN65 (2.5-inch pipe), DN80 (3-inch pipe), DN100 (4-inch pipe), DN100 (4-inch pipe), DN50 (inch pipe), DN50 (2-inch), DN65 (2.5-inch pipe), DN80(3-inch pipe), DN100 (4-inch pipe), DN100 (4-inch pipe), DN50 (inch pipe), DN50 (2-inch; (8-inch pipe), and DN250 (10-inch pipe). Exempli gratia, fistula aquaria DN25 (25 mm) aequivalet cum fistula imperiali 1-unc, etiam nota ut 8-inch fistula ante Liberationem Exercitus. A DN15 fistula aquatica aequipollet tibiae imperatoriae 1/2-unciae, etiam nota ut 4-unca fistula ante Liberationem Exercitus. Exempli gratia, fistula aquae DN20 est vexillum 3/4" Britannicum, etiam ut 6 inch fistula ante Motum Liberationis notum est.
2. Signa Internationalis
Vexillum internationale tibia ferrea in partes minores dividens innititur. Specificationes includunt 1/8, 1/4, et 3/8 pollices, aequivalentes vulgo 1-unc et 7-inch tibiae. Minores magnitudinis exprimuntur ut 1/16, 1/32, et 1/64, adhuc in unc. Si denominator et numerator reduci possunt (exempli gratia numerator 2, 4, 8, 16, vel 32), reduci debent.
3. Steel Pipe Size Calculus
De pondere calculi formulae variae ad varia genera fistulae ferreae. Infra, MIAGOO varias formulas calculi communis ponderis breviter introducet;
Pondus ferri rotundus (kg)=0.00617 x Diameter x Diameter x Longitudo;
Pondus Steel quadratum (kg)=0.00785 x Latitudo laterum x Latitudo x Longitudo;
Plana Steel Pondus (kg)=0.00785 x Crassitudo x Frame x Longitudo.