Hydro Jetting Service Standard

Purpose

A jetter does not know what pipe it is in. It will scour grease out of sound cast iron and it will just as happily wash soil in through a cracked clay joint until the customer has a void under a driveway. Two decisions govern every jetting job and both are made before the pump starts: whether this pipe can take it, which comes from a camera, and where the water and everything it carries is going to go, which comes from a containment plan. This standard also carries the injury nobody in this trade should learn the hard way, because a jet stream will inject through skin and the wound looks trivial for the first hour.

Scope

Covers jetting of a residential building sewer, main line or grease-laden branch from a cleanout or accessible opening, ending with camera verification and a flow test.

It does NOT cover cable clearing, which the drain cleaning service standard owns, or the inspection itself and its defect coding, which the sewer camera SOP owns. It does not cover repair of a defect the jetting exposed. Jetting is not performed on a line with a known collapse, on bituminous fiber pipe, or on cast iron with visible wall perforation, and the gate for that decision is step 1.

Roles and the handoff

The handoff that fails: a tech jets through a soft spot, water goes into the ground, and the ticket says the line was cleared. Six weeks later the yard settles and the shop has no record of what it saw.

Procedure

1. Gate the job on pipe condition before the reel comes off the truck. Either a camera run this visit or a documented run recent enough to trust, establishing material, size and defects. Acceptance: material and defect list written on the ticket. Wrong looks like jetting an unknown line because the customer asked for it: bituminous fiber pipe, a collapsed section or cast iron with perforated wall does not survive the pressure, and the money the camera saved becomes an excavation.

2. Name the exclusions out loud with the customer if any apply. Offsets past roughly a third of the pipe wall, a section already holding soil, or a line the camera could not pass are all reasons to cable or to repair instead. Acceptance: the decision recorded in their words. Wrong looks like a tech jetting "carefully" past a known defect, which is a judgment nobody can defend afterward because the pressure at the nozzle does not care how carefully the trigger was held.

3. Measure the water supply rather than assuming it. Time a 5 gallon container at the hose bib and convert to gpm, then compare to the jetter's rated consumption. Acceptance: measured gpm at least matching the machine's demand with margin. Wrong looks like a pump starving mid-pass, which drops pressure, stalls the nozzle in the line, and on some machines overheats the pump: fit a transfer tank instead of running the machine dry.

4. Plan where the water goes and protect every fixture below the work. Jetting pushes water and debris and can surcharge a lower fixture without warning, so remove or block basement and lower-level closets, put containment under the access, and keep occupants and pets out of the room. Acceptance: lower fixtures protected, containment placed, customer told which rooms to stay out of. Wrong looks like a basement shower geysering while the tech is outside at the cleanout.

5. Prove the dead-man control and set up so the nozzle can never leave the pipe under pressure. Test the foot valve or trigger with the nozzle in a bucket and confirm the pump unloads instantly on release. Acceptance: instant stop on release, pressure gauge reading zero at the nozzle. A jet stream at working pressure injects through skin and clothing, and an injection wound looks like a pinhole for the first hour while it does its damage, so nobody's hand goes near the nozzle with the pump live, nobody points it at a person, and any skin break gets immediate emergency care with the words "high pressure injection injury" said to the clinician.

6. Insert the nozzle well into the line before the pump is engaged. Feed several feet past the entry so the rearward thrust jets cannot back the nozzle out of the opening, and stop the pump before withdrawing back past that point. Acceptance: nozzle at depth, pump started only after. Wrong looks like a nozzle exiting a cleanout under thrust and whipping the hose, which happens fast enough that reaction time is not the control; sequence is.

7. Work in passes rather than in one long push. Penetrate to a distance, then retrieve slowly so the rear jets carry debris back toward the access, then advance further on the next pass. Acceptance: debris visibly returning at the access on each retrieval. Wrong looks like pushing the nozzle to the end of the line and pulling it straight back: the grease goes downstream into the main and the customer's problem becomes somebody else's, briefly, before it becomes theirs again.

8. Use the lowest pressure and the nozzle that does the work, not the highest available. Machine rating is what the pump can produce; what governs is what the pipe can take, which you established at step 1. Acceptance: nozzle type and working pressure recorded. Where a hot-water jetter is in use, remember the discharge scalds as well as cuts, so the same distance rules apply with a burn hazard on top.

9. Watch the line's behavior continuously and treat a change as a stop, not a curiosity. Steady return flow at the access, steady gauge pressure, no water appearing where it should not. Acceptance: return flow steady through each pass. Wrong looks like return flow falling off while the pump keeps drawing, a sudden pressure drop, or soft or wet ground over the line: shut down immediately, do not finish the pass, and camera before anything else, because those three cues mean the water has found somewhere to go that is not the pipe.

10. Verify with a camera and a volume flow test before calling it done. Re-run the camera to confirm wall condition and that the line is clear to the termination, then fill a tub or run fixtures together for at least 5 minutes. Acceptance: clean pipe wall on camera and released volume going away with no rise at any fixture or floor drain. Wrong looks like a camera image still showing a grease band at the crown: that is a second pass, not a finished job.

11. Tell the customer what the water found, plainly, and record it. Distinguish what was cleared from what was revealed. Acceptance: cause, condition and recommendation on the ticket with images. Wrong looks like a clean bill after a run that exposed a defect, which is the version the shop cannot defend when the ground opens.

When the pipe stops behaving

Return flow disappears: shut down and camera. Water going into soil means a break, and every additional minute of jetting enlarges the void. The nozzle stalls and will not advance: do not increase pressure to force it; retrieve, camera the stop point, and treat it as a structural finding. A fixture surcharges inside the house: stop, clear the room, and reassess the access point, because you are pressurizing a section with no downstream path. The camera gate cannot be met because the line is too full to see: cable it first under the drain cleaning standard, then camera, then decide about jetting. In all four, the honest ticket is the one that says jetting was stopped and why. A jetting job abandoned at 20 minutes with a clear reason is a good day compared to one finished into a broken pipe.

The record this produces

One jetting record per event on the property record:

• Pre-jet camera result: material, size, defects, and distances
• Measured water supply in gpm against the machine's demand
• Fixtures protected and rooms closed off
• Nozzle type, working pressure, number of passes and distance reached
• Return flow behavior through each pass, including any interruption
• Post-jet camera images and the flow test result with the volume used
• Anything the jetting revealed, photographed, with the surface location marked
• Recommendation and what the customer was told, in their words

The lead quotes repairs from it. The next tech knows this line has been jetted, at what pressure, and what its wall looked like afterward, which is exactly what tells them whether to jet it again.

Worked pass: repeat kitchen backup, 4 in cast iron to clay, 1958 house

Pre-jet camera: cast iron from the house to about 20 ft, transitioning to clay; heavy grease banding through the cast iron, joints intact on camera, no visible perforation. Jetting approved on that basis.

• Step 3: hose bib filled a 5 gallon container in 40 seconds, which is 7.5 gpm, against a machine rated at 4 gpm. Adequate with margin, no transfer tank needed.
• Step 4: basement closet pulled and plugged, containment at the cleanout, customer and dog kept upstairs.
• Step 5: foot valve tested in the bucket, pump unloaded instantly, gauge at zero on release.
• Steps 6 to 8: nozzle fed 6 ft in before the pump was engaged; first pass to 20 ft, retrieved slowly with heavy grease returning at the cleanout; second pass to 34 ft.
• Step 9: FAILED on the third pass. Beyond about 34 ft the return flow at the cleanout thinned to intermittent while the pump kept drawing full supply, and a patch of lawn over the line went visibly soft. Stop rule taken: pump shut down, nozzle retrieved, pass abandoned, no attempt to finish the run.

Camera into the clay section found a joint open at the top with soil visible at roughly 34 ft, the same distance where the return flow died. The grease in the cast iron was real and had been removed; the open joint was pre-existing, and the jetting did not create it, but it did wash soil into the pipe and would have kept doing so. The customer was told exactly that, with the image, the surface mark from the sonde and the distance. The ticket recorded jetting completed to 34 ft, stopped for cause, with a spot repair quoted at the marked location.

References

• Jetter manufacturer's operating manual, which governs nozzle selection, rated flow, working pressure and dead-man control testing
• 29 CFR 1910.132 for the employer's personal protective equipment duties toward employees, covering face and eye protection and waterproof gear for this work
• Emergency medicine guidance on high pressure injection injuries, which are treated as surgical emergencies regardless of how small the entry wound looks
• See related: the sewer camera inspection and report SOP, and the drain cleaning service standard