The Hogarthian regulator configuration uses a standard set of hose lengths, for simplicity and standardization.
The standard hose lengths are ideal, when properly routed, in that they lay close the diver's body, without taking large "bends" creating a messy, non-streamlined profile (and entanglement in overhead), but aren't so tight that they cannot be manipulated or routed properly.
For instance, the SPG hose should be just long enough to clip it off to your left hip D-ring. Anything longer than that and the HP hose will take a wide bend away from the diver's body, which will get in the way of stage/deco bottles and will be an annoyance in an overhead, in addition to possibly damaging the overhead environment. 26" for single tank and 24" for doubles are perfect for almost all divers up to 6'2" or so. Note the single tank SPG hose is ~2" than the doubles. This is because the single tank 1st stage is "centered" on the diver, where the HP hose on double tanks is connected to the left 1st stage, which is on the diver's left side, a bit closer to the diver's left hip D-ring.
Likewise, the backup/necklace should be short enough that it stays close to the diver's neck, rests on the right shoulder, and sits below the divers chin. If the hose is too long, the 2nd stage will lay to the
STANDARD HOSE LENGTHS
left of the diver's chin, or the hose will take a wide bend over the diver's shoulder, sometimes "falling" over the diver's shoulder, laying next to the outer deltoid. 22 -24" for single tank and 24" for doubles is the ideal length for most divers. A good way to determine proper backup/necklace hose length is to don your gear, include exposure protection and hood. Put the backup regulator in your mouth and turn to your left. You should be able to turn your head all the way to the left, without your regulator/hose preventing you doing so.
Some considerations with hoses:
|HOSE||SINGLE TANK||DOUBLE TANKS||STAGE / DECO|
5 - 7'
36" - swivel turret 1st stage
40" - non-swivel 1st stage
|Backup / Necklace Regulator||22 - 24"||24"||N / A|
|SPG||26"||24"||6 - 9"|
|LPI / Wing Inflator||As needed||As needed||N / A|
|Drysuit Inflator||As needed||As needed||N / A|
The hose lengths listed on the table above are ideal lengths, when routed properly. Their may be a bit of deviation necessary due to the positioning of the hose ports on the 1st stage, or the diver's physique (specifically, the torso length for the HP/SPG hose), but there shouldn't be much more than a 1-2" variation from the lengths listed on the table above, and any deviation should be kept to a minimum and only if absolutely necessary.
Standardization works very well for exploration or large projects, where "next gear up" is a necessity. Meaning, if a piece of gear fails, such as a hose, standardization allows for quick replacement of the failed hose with a new hose of the same length, allowing the project to continue with very little interruption or delay.
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