This standard delineates the specifications for high-pressure jetting equipment designed for sewer maintenance. It addresses the design criteria, essential components, operational performance, and safety provisions for devices such as prime movers, pumps, hose reels, control interfaces, and water storage tanks, ensuring dependable and secure functionality.
Overview
This standard delineates the specifications for high-pressure jetting equipment designed for sewer maintenance. It addresses the design criteria, essential components, operational performance, and safety provisions for devices such as prime movers, pumps, hose reels, control interfaces, and water storage tanks, ensuring dependable and secure functionality.
Audience
Contents
Structure
Overview of Scope & Primary Specifications for High-Pressure Jetting Equipment
Scope (Clause 1.1):
Defines requirements for high-pressure jetting units utilized in sewer clearing.
Included Accessories (Clause 3.1):
Mandatory items per unit include:
flowchart LR
WaterTank[Water Tank] --> Pump[Pump]
Pump --> Hose[High-Pressure Hose]
Hose --> Nozzle[Nozzle]
Nozzle --> Cleaning[Sewer Cleaning Action]
Note: The standard emphasizes equipment criteria, accessories, and operational instructions rather than intricate design calculations.
Key Constituents of High-Pressure Jetting Machines for Sewer Maintenance
While IS 11387 does not explicitly provide detailed formulas or tabulated data, the fundamental components with their specifications generally include:
| Parameter | Approximate Range |
|---|---|
| Operating Pressure | 100 - 300 bar |
| Flow Rate | 20 - 60 liters/min |
| Hose Length | 30 - 100 meters |
| Nozzle Diameter | 6 - 12 mm |
[ F = \rho \times A \times v^2 ] Where:
flowchart LR
WaterTank --> HighPressurePump
HighPressurePump --> HighPressureHose
HighPressureHose --> Nozzle
Nozzle --> CleaningProcess[Sewer Cleaning]
HighPressurePump --> PoweredByEngine
HighPressurePump --> ControlPanel
This diagram illustrates water flow from the tank through the pump, hose, and nozzle to the sewer for cleaning.
Refer to IS 11387 and manufacturer guidelines for detailed design and safety margins.
Specifications for Prime Movers in High-Pressure Jetting Machines
| Component | Specification |
|---|---|
| High-Pressure Pump | Positive displacement or equivalent; delivering ≥ 200 L/min at 10–14 N/mm² |
| Hydraulic Drive | Hose reel operation powered hydraulically, with manual rewind crank for emergencies |
| Ladder Clearance | Minimum of 370 mm to ensure safe access (Fig. 2) |
graph LR
Engine[Prime Mover] --> Pump[High-Pressure Pump]
Pump --> HoseReel[Hose Reel]
HoseReel --> HydraulicDrive[Hydraulic Drive]
Engine --> ControlPanel[Control Panel]
Engine --> WaterTank[Water Tank]
Engine --> Chassis[Chassis]
Engine --> Cover[Protective Cover]
These specifications ensure the jetting machine's power source is adequate and operational safety is maintained as per IS 11387.
Specifications of High-Pressure Pumps for Sewer Cleaning Jetting Units
[ P = \frac{F}{A} ] Where:
| Parameter | Specification |
|---|---|
| Flow Rate | ≥ 200 L/min |
| Pressure | 10–14 N/mm² (100-140 bar) |
| Pump Type | Positive displacement |
| Ladder Clearance | ≥ 370 mm |
flowchart LR
WaterSource --> Pump
Pump --> PressureControl
PressureControl --> JetNozzle
JetNozzle --> SewerCleaning
This setup ensures effective sewer blockage removal with controlled high-pressure water as per IS 11387.
Hydraulic Drive Specifications for High-Pressure Jetting Machines
| Parameter | Specification |
|---|---|
| High-Pressure Pump Flow | ≥ 200 L/min |
| Operating Pressure | 10–14 N/mm² (100–140 bar) |
| Prime Mover Power | ≥ 65 kW or 20% above connected load |
| Minimum Ladder Clearance | 370 mm |
flowchart LR
Start --> HydraulicDriveActive
HydraulicDriveActive --> IsPumpRunning{Pump Running?}
IsPumpRunning -- Yes --> WindUnwindHose
IsPumpRunning -- No --> WindUnwindHose
WindUnwindHose --> ManualRewindEmergency
ManualRewindEmergency --> HosePushedForward
HosePushedForward --> CleaningOperation
CleaningOperation --> End
This ensures controlled hose handling and secure operation in accordance with IS 11387.
Control Panel Requirements and Instrumentation
Placement and Grouping (Clause 2.5):
Instruments to Include:
Materials:
flowchart LR
IgnitionSwitch --> OilPressureGauge
OilPressureGauge --> TemperatureGauge
TemperatureGauge --> ThrottleControl
ThrottleControl --> GlowPlugButton
GlowPlugButton --> WaterTankSightGlass
WaterTankSightGlass --> WaterPressureGauge
WaterPressureGauge --> WaterFlowValve
WaterFlowValve --> HoseReelControlLever
HoseReelControlLever --> LowWaterLevelSwitch
LowWaterLevelSwitch --> LowOilPressureSwitch
This arrangement ensures safe and effective control during sewer cleaning operations.
Water Tank Specifications for High-Pressure Jetting Equipment
Capacity: Must provide water sufficient for at least 30 minutes of continuous pump operation.
Material: Constructed from mild steel with an epoxy coating applied internally and externally to resist corrosion.
Key Features:
Pump Flow Reference (Clause 2.2):
[ \text{Tank Volume (L)} = \text{Pump Flow Rate (L/min)} \times 30 \text{ min} ]
Example: [ 200 , L/min \times 30 , min = 6000 , L ]
flowchart LR
WaterTank --> OutletStrainer --> Pump
WaterTank --> DrainValve
WaterTank --> LevelIndicator
These specifications guarantee dependable water supply and easy upkeep as per IS 11387.
Specifications for Protective Covers of Jetting Machines
| Parameter | Specification |
|---|---|
| Thickness | 16 mm |
| Material | Galvanized iron sheet |
| Function | Enclosure for engine, pump, hose reel compartments |
| Design Style | Streamlined |
flowchart LR
Engine --> Cover[16 mm GI Sheet Cover]
Pump --> Cover
HoseReel --> Cover
Cover --> Protection[Environmental Protection & Streamlining]
This ensures mechanical parts are safeguarded against dust, moisture, and physical harm as required by IS 11387.
Suction Device Requirements for High-Pressure Jetting Units
The suction apparatus is designed to extract sludge from manholes and transfer it into storage containers.
Operational Notes (Clause 3.1):
| Parameter | Approximate Range |
|---|---|
| Suction Hose Diameter | 50 mm to 150 mm |
| Suction Flow Rate | 0.5 to 2.0 cubic meters/min |
| Operating Pressure | 100 to 200 bar (jetting water) |
| Power Source | Diesel or electric motor |
[ Q = A \times V ] Where:
flowchart LR
Manhole -->|Suction Hose| SuctionDevice
SuctionDevice --> SludgeContainer
Manhole -->|High-Pressure Jet| BlockedSewer
BlockedSewer -->|Debris Cleared| Manhole
Summary: The suction device is a critical component for effective sludge removal in sewer cleaning. Its design must align with jetting pressures and sludge volumes to ensure optimal performance.
Standard Accessories and Spare Parts for Sewer Jetting Units
Every unit should be equipped with:
flowchart LR
Unit --> SewerNozzles[3 Sewer Cleaning Nozzles]
Unit --> NozzleExtension[1 Nozzle Extension]
Unit --> TankStrainers[2 Top Tank Strainers]
Unit --> Manuals[2 Sets of Manuals & Spare Lists]
Unit --> HoseGuide[1 Hose Guide]
Unit --> HoseReels[4 Hose Reels (100 m each)]
Unit --> Spares[3-Year Spare Parts Kit]
This package ensures operational readiness and ongoing maintenance support as per IS 11387.
Summary of Instruction Manuals and Operating Procedures
Included Accessories:
Spares Provided:
Control Panel Instruments:
Operating Instructions:
graph TD
A[Engine Ignition Switch] --> B[Oil Pressure Gauge]
B --> C[Temperature Gauge]
C --> D[Throttle & Glow Plug]
D --> E[Water Tank Sight Glass & Warning Light]
E --> F[Water Pressure Gauge]
F --> G[Water Flow Control Valve]
G --> H[Hose Reel Control Lever]
H --> I[Low Water Level Safety Switch]
I --> J[Low Oil Pressure Safety Switch]
This ensures safe, effective operation and maintenance of sewer jetting equipment in line with IS 11387.
Frequently Asked
Per IS 11387 Clause 2.1, the prime mover must be a water-cooled diesel engine with a minimum power rating of 65 kW or 20% above the connected load, whichever is greater. For truck-mounted units, a separate prime mover is not required as power may be drawn from the truck engine via a power take-off. This ensures reliable operation of the pump and related components.
According to IS 11387 Clause 2.2, the pump should be a heavy-duty positive displacement type or an equivalent high-pressure pump capable of supplying at least 200 liters per minute at pressures ranging from 10 to 14 N/mm² (100 to 140 bar). The pump must include pressure regulation controls to maintain safe and efficient performance.
The hose reel is hydraulically powered to wind and unwind the hose while the pump is operating or independently. A manual rewind crank is provided for emergency situations. Hose deployment into the sewer is controlled to proceed slowly, hydraulically or manually. Safety features on the control panel include engine ignition, oil pressure and temperature gauges, water tank sight glasses with low-level warning, water pressure gauge, flow control valve, speed and direction control lever for the hose reel, and low water and oil pressure safety switches. High-pressure tubing and steel forged fittings ensure operational safety.
IS 11387 recommends using mild steel for water tanks, coated internally and externally with epoxy to resist corrosion. The entire unit should be treated with an anti-corrosive primer followed by two coats of acrylic or a suitable paint. This combination protects the tank from corrosive sewage gases and abrasive substances, ensuring durability and structural integrity.
As per IS 11387 Clause 2.5, the control panel must include an engine ignition switch, oil pressure gauge with a low oil pressure safety switch, temperature gauge, throttle control, glow plug button, sight glasses for water tank level with a low-level warning light, water pressure gauge, water flow control valve, a combined control lever for hose reel speed and direction, and a low water level safety switch. All high-pressure piping must use high-quality tubing with steel forged fittings to ensure safety and reliability.
IS 11387 mandates that each jetting machine be supplied with three sewer cleaning nozzles having different rearward angles, one nozzle extension for easy attachment, two top tank strainer elements, two sets of operation and service manuals including spare parts lists, and one hose guide. Additionally, four reels of hose pipe, each 100 meters long, and spare parts sufficient for three years of operation must be provided.
The standard requires that the jetting machine be operated with power-assisted hose winding to minimize manual strain. After use, the pressure water system must be completely drained to prevent corrosion or damage. Maintenance includes supplying four 100-meter hose reels and spare parts sufficient for three years. The instruction manual must detail safe operation and maintenance procedures to ensure longevity and reliable performance.
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