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AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions Medium Pressure Convoluted Hose Shortening Instructions Version 1.1 February 2017 Written by Tino de Rijk Page 1 of 38...
3.1 Special Tools needed ................... 17 3.2 Standard Tools needed ................18 4. Shortening Medium Pressure (AP50) hoses (NOT Auto Air) ..... 19 4.1 Mark where you want to cut the MP hose ............. 19 4.2 Unscrew the 3/8”UNF hose end from the hose collar ........19 4.3 Unscrew the hose collar from the MP hose ..........
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AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 7. Shortening convoluted hoses – old split ring type ......33 7.1 Hold the convoluted hose end with RBTOOL12 for better grip ..... 33 .......................... 33 7.2 Unscrew outer hose clamp from split inner hose clamp halves ....33 7.3 Remove the two split inner hose clamp halves from convoluted hose ..
Before servicing AP medium pressure or convoluted hoses you must receive instruction and certification in hose shortening and end fitting maintenance by AP Diving. Without the correct training it is possible to shorten hoses or service end fittings in an unsafe manner.
(including the Internet) or machine-readable form without prior consent in writing from AP Diving. All products are sold on the strict understanding that only English Law applies in cases of warranty claims and product liability, regardless of where the equipment is purchased or used.
Oxygen heat shrink (optional) HS-01 Hose AP-50-C 3/8” UNF hose end AP-50-P4 O-ring BS-903-N70 AP50 hoses are used on the rebreather manual inflators, AP400 dry suit inflator and the AP200 BCD inflator (not the Auto Air). Page 6 of 38...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.2 EV50 Auto Air Hose Assembly (new model with standard hose) NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-903-N70 3/8” UNF end AP-50-P4 Hose collar AP-50-P3 LP hose AP-50-C Coupling body...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.3 AP150 Auto Air Hose Assembly (old model with bigger bore hose) NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-903-N70 3/8” UNF end AP-150-01 Hose collar AP-150-02 LP hose AP-150-C Coupling body...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.4 RB07B/01 Scrubber Canister Exhale Hose Assembly – New Ty-wrap version NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-027-N70 BS-027-N70 Swivel stem – modified RB12-04-M Canister locking ring RB12-05 Curved Ty-wrap...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.5 RB07B/02 Scrubber Canister Inhale Hose Assembly – New Ty-wrap Version NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-027-N70 BS-027-N70 Swivel stem RB12-04 Inhale locking ring - square RB12-03-IN Curved Ty-wrap...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.6 RB07B/03 Mouthpiece Inhale Hose Assembly – New Ty-wrap Version NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-027-N70 BS-027-N70 Mouthpiece swivel stem RB02-06 Mouthpiece locking ring RB02-09 Curved Ty-wrap RBCT1 Curved Ty-wrap cover...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.7 RB07B/04 Mouthpiece Exhale Hose Assembly – New Ty-wrap Version NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-027-N70 BS-027-N70 Mouthpiece swivel stem RB02-06 Mouthpiece locking ring RB02-09 Curved Ty-wrap RBCT1 Curved Ty-wrap cover...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.8 RB07/01 Scrubber Canister Exhale Hose Assembly – Old Clamped Version NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-027-N70 BS-027-N70 Swivel stem RB12-04 Canister locking ring RB12-05 Hose clamp inner RB12-01...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.9 RB07/02 Scrubber Canister Inhale Hose Assembly – Old Clamped Version NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-027-N70 BS-027-N70 Swivel stem RB12-04 Inhale locking ring - square RB12-03-IN Hose clamp inner...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.10 RB07/03 Mouthpiece Inhale Hose Assembly – Old Clamped Version NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-029-N70 BS-029-N70 Mouthpiece swivel stem RB02-06 Mouthpiece locking ring RB02-09 Hose clamp inner RB12-01...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 2.11 RB07/04 Mouthpiece Exhale Hose Assembly – Old Clamped Version NUMBER DESCRIPTION PART NUMBER QUANTITY O-ring BS-029-N70 BS-029-N70 Mouthpiece swivel stem RB02-06 Mouthpiece locking ring RB02-09 Hose clamp inner RB12-01...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 3. Tools 3.1 Special Tools needed When shortening MP and Convoluted hoses, the following special tools are needed: Hose cutting tool. This generic tool can be found on the Internet on various places when entering the search string “nylon tube hose cutter up to 12 mm”.
Medium Pressure and Convoluted Hose Shortening Instructions RBTOOL12 convoluted hose end holding tool. This tool can be bought from AP Diving. However it is only needed for shortening convoluted hoses with the old type of convoluted hose ends (pre 2009) that use locking rings and split rings, as shown below.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 4. Shortening Medium Pressure (AP50) hoses (NOT Auto Air) 4.1 Mark where you want to cut the MP hose 4.2 Unscrew the 3/8”UNF hose end from the hose collar Using 2 x 17 mm spanners, unscrew the hose end from the hose collar Unscrew anti-clock-wise.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 4.3 Unscrew the hose collar from the MP hose WARNING: This has a Left Hand Thread, so in order to unscrew it, you need to unscrew clock-wise, NOT anti-clock-wise! Using a 17 mm spanner, unscrew the hose collar from the MP hose Unscrew clock-wise.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 4.5 Screw the shortened MP hose back into the hose collar WARNING: This has a Left Hand Thread, so in order to screw the hose in the hose collar, you need to screw anti-clock-wise, NOT clock-wise! Using a 17 mm spanner, screw the hose collar onto the MP hose.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 4.6 Screw the 3/8”UNF end back into the hose collar Using 2 x 17 mm spanners, screw the hose end into the hose collar Screw clock-wise until the shoulders touch. There is no need to over tighten! TIP: Before screwing the hose end in, wet it with some soapy water.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 4.8 Shortening the ADV and OCB hoses on the latest screw connector end (AP300) Pre June 2014, the 9/16” UNF female fitting or “screw connector” hose had a crimped fitting, and those hoses are only length adjustable at the other end of the hose by removing the 3/8”...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 5. Shortening Auto Air Medium Pressure (MP) hoses 5.1 Important notice: beware: TWO types of hoses and connectors! It is very important to know that over time AP has used two types of hoses for the Auto Air.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions TOP: Standard AP50C hose with standard diameter hose end (13 mm diameter / 6.35 mm (1/4”) bore hose with 16.5 mm diameter hose end fitting) BOTTOM: Larger diameter AP150C hose with larger diameter hose end (14 mm diameter / 7.9 mm...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions Of these two measurements, the bore is the more reliable. The outside diameter can vary from batch to batch but the bore should always be consistent. The two types of Auto Air snap connectors are easy to distinguish: the older type (AP150) has a straight hose connection with a diameter of 18.8 mm...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 5.4 Shortening the hose on the snap connector end Shortening the Auto Air MP hose on the snap connector end is done essentially the same as described in paragraphs 4.1 through 4.6: Instead of unscrewing the hose end from the hose collar, as described in paragraph 4.2, you now unscrew the complete snap connector part from the hose collar.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 6. Shortening convoluted hoses – new Ty-wrap type 6.1 Pull the curved Ty-wrap cover down the convoluted hose Pull the curved Ty-wrap cover STRAIGHT down the convoluted hose. DON’T turn it: just pull it straight down.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 6.3 Pull the convoluted hose from the swivel stem Pull the convoluted hose STRAIGHT down the swivel stem. DON’T turn it: just pull it straight down. Page 29 of 38...
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 6.4 Cut the convoluted hose to the desired length Preferably use a very sharp pair of scissors. Snip or cut into a valley of the convoluted hose, NOT into a rib.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions CORRECT: first ring is over the flange of the stem WRONG: first ring is NOT over the flange of the stem 6.6 Fit two new Ty-wraps onto convoluted hose Use a cable tie tension gun to fit two new Ty-wraps onto the convoluted hose.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions CORRECT: clasps of the newly fitted Ty-wraps are at a 180 degree angle of each other. 6.7 Push curved Ty-wrap cover back over the Ty-wraps Push the curved Ty-wrap cover STRAIGHT up on the convoluted hose.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 7. Shortening convoluted hoses – old split ring type 7.1 Hold the convoluted hose end with RBTOOL12 for better grip For better grip while unscrewing the outer hose clamp we recommend using RBTOOL12 or an equivalent tool.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 7.3 Remove the two split inner hose clamp halves from convoluted hose Lift the two halves that make up the inner hose clamp from the convoluted hose. 7.4 Pull the convoluted hose from the swivel stem Pull the convoluted hose STRAIGHT down the swivel stem.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 7.5 Cut the convoluted hose to the desired length Preferably use a very sharp pair of scissors. Snip or cut into a valley of the convoluted hose, NOT into a rib.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions CORRECT: first convolution sits AGAINST the flange of the swivel stem, NOT over it. 7.7 Refit the two split inner hose clamp halves onto the hose The threaded two-part split inner hose clamp has a 90-degree internal lip that has to hook OVER the flange of the swivel stem.
AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions 7.8 Screw outer hose clamp back onto the split inner hose clamp halves Once both halves of the inner hose clamp are in position, screw the outer hose clamp back on while preventing the hose and swivel stem from turning.
The new version of the locking ring has a slightly smaller inside diameter that makes it easier to remove the hose from the T-piece. All these parts are available from AP Diving. 8. Testing Instructions 8.1 Test for leaks and proper operation 1.
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