Requirements for high-pressure jetting machine for sewer cleaning

IS 11387: Scope & Key Specifications for High Pressure Jetting Machines

• Scope (Clause 1.1):
  Covers requirements for high pressure jetting machines used in sewer cleaning.

• Standard Accessories (Clause 3.1):
  Each unit must include:

  • Three sewer cleaning nozzles with different rearward angles
  • One nozzle extension for easy hose/nozzle fixing
  • Two top tank strainer elements
  • Two sets of operation & service manuals and spare parts lists
  • Hose guide

Key Concept: High Pressure Jetting Machine Components

flowchart LR
    A[Water Tank] --> B[Pump]
    B --> C[High Pressure Hose]
    C --> D[Nozzle]
    D --> E[Sewer Cleaning Action]

• Function: High pressure water jetting removes blockages by directing jets at sewer walls.
• Nozzle angles: Varying rearward angles optimize cleaning efficiency.

Note: The standard focuses on equipment requirements, accessories, and operational guidelines rather than detailed design formulas.

IS 11387: Components of a High Pressure Jetting Machine for Sewer Cleaning

Though IS 11387 does not explicitly list detailed formulas or tables, the key components and their specifications for a High Pressure Jetting Machine typically include:

Key Components:

• High Pressure Pump: Delivers water at pressures typically ranging from 100 to 300 bar.
• Water Tank: Capacity depends on operational needs, commonly 200 to 1000 liters.
• Hose Reel & High Pressure Hose: Rated for pressures matching pump output, usually 3/8" to 1/2" diameter.
• Nozzle: Designed for effective jetting; types include rotating or fixed jet nozzles.
• Engine or Motor: Powers the pump; rated by power output (e.g., 10-30 HP).
• Control Panel: For pressure regulation and operation.

Typical Operating Parameters:

Basic Formula for Jet Force:

[ F = \rho \times A \times v^2 ] Where:

• ( F ) = Jet force (N)
• ( \rho ) = Density of water (~1000 kg/m³)
• ( A ) = Cross-sectional area of nozzle (m²)
• ( v ) = Velocity of water jet (m/s)

flowchart LR
    A[Water Tank] --> B[High Pressure Pump]
    B --> C[High Pressure Hose]
    C --> D[Nozzle]
    D --> E[Sewer Cleaning]
    B --> F[Engine/Motor]
    B --> G[Control Panel]

This schematic shows the flow from the water tank through the pump and hose to the nozzle for sewer cleaning.

For detailed design and safety factors, refer to IS 11387 and manufacturer specs.

IS 11387: Prime Mover Specifications for High Pressure Jetting Machines

• Prime Mover Type: Water-cooled diesel engine.
• Minimum Power Rating:
  [ P_{min} = \max(65, kW, 1.2 \times \text{connected load}) ]
• Exception: No separate prime mover needed if truck-mounted with power take-off from truck engine (see Fig. 2).

Key Related Specifications:

Summary Diagram of Components (Clause 2.0):

graph LR
  A[Prime Mover] --> B[High Pressure Pump]
  B --> C[Hose Reel]
  C --> D[Hydraulic Drive]
  A --> E[Control Panel]
  A --> F[Water Tank]
  A --> G[Chassis]
  A --> H[Cover]

This ensures reliable power and operational safety for high pressure jetting machines as per IS 11387.

IS 11387: High Pressure Pump for Sewer Cleaning Jetting Machines

Key Specifications (Clause 2.2)

• Pump Type: Heavy duty positive displacement or equivalent high-pressure pump.
• Flow Rate: Minimum 200 liters/min.
• Pressure: 10 to 14 N/mm² (100 to 140 bar) at vehicle end.
• Controls: Must include pressure regulation capability.

Design & Installation Notes

• Clearance for Ladder: Minimum 370 mm for safe climbing.
• Typical Setup: Refer to Fig. 2 for truck-mounted jetting machine layout.
• Application: Suitable for sewer cleaning with high-pressure water jets.

Typical Pump Performance Formula

[ P = \frac{F}{A} ] Where:

• (P) = Pressure (N/mm²)
• (F) = Force exerted by pump (N)
• (A) = Area of piston/cylinder (mm²)

Summary Table

flowchart LR
    A[Water Source] --> B[High Pressure Pump]
    B --> C[Pressure Regulator]
    C --> D[Jetting Nozzle]
    D --> E[Sewer Cleaning]

This setup ensures effective sewer cleaning with regulated high-pressure water jets as per IS 11387.

IS 11387: Hydraulic Drive for High Pressure Jetting Machine

Key Specifications (Clause 2.4)

• Hydraulic Drive: Reel for hose winding/unwinding must have a hydraulic drive.
• Operation possible with or without the high-pressure pump running.
• Manual rewind crank mandatory for emergency use.
• Hose must be pushed slowly forward into the sewer, either hydraulically or manually.

Related Key Parameters (Clauses 2.2 & 2.1)

Notes:

• Hydraulic drive ensures smooth control of hose deployment.
• Manual crank is a safety backup.
• Hose guidance must prevent damage and ensure effective cleaning.

Typical Hydraulic Drive Operation Flow

flowchart LR
    A[Start] --> B[Hydraulic Drive Activated]
    B --> C{Is Pump Running?}
    C -- Yes --> D[Wind/Unwind Hose]
    C -- No --> D
    D --> E[Manual Rewind if Emergency]
    E --> F[Hose Pushed Slowly Forward]
    F --> G[Cleaning Operation]
    G --> H[End]

This ensures controlled hose deployment and safe operation per IS 11387.

IS 11387: Control Panel Key Specifications & Instruments

Location & Grouping (Clause 2.5):

• Control panel must be adjacent to the hose reel for easy operation.

Instruments on Control Panel:

• Engine ignition switch
• Oil pressure gauge
• Temperature gauge
• Throttle control
• Glow plug button
• Sight glasses for water tank level + low-level warning light
• Water system pressure gauge
• Water flow control valve
• Combination control lever (speed & direction of hose reel)
• Low water level safety switch
• Low oil pressure safety switch

Material Requirements:

• High-pressure tubing and steel forged fittings for piping subjected to high pressure.

Additional Notes:

• Hose pipes: 4 reels × 100 m each (Clause 3.2)
• Enclosure: 16 mm thick galvanized iron sheet cover for engine, pump, hose reel (Clause 2.7)

Typical Gauge & Valve Symbols on Control Panel

flowchart LR
    A[Engine Ignition Switch] --> B[Oil Pressure Gauge]
    B --> C[Temperature Gauge]
    C --> D[Throttle Control]
    D --> E[Glow Plug Button]
    E --> F[Water Tank Sight Glass + Low Level Light]
    F --> G[Water Pressure Gauge]
    G --> H[Water Flow Control Valve]
    H --> I[Speed & Direction Lever]
    I --> J[Low Water Level Safety Switch]
    J --> K[Low Oil Pressure Safety Switch]

This layout ensures safe, convenient, and efficient control during sewer cleaning operations.

IS 11387: Water Tank Specifications for High Pressure Jetting Machine

• Capacity: Must hold at least 30 minutes of water supply for the high pressure pump.

• Material: Mild steel tank with epoxy coating inside and outside for corrosion resistance.

• Required Features:

  • Inspection and access openings
  • Strainer on outlet to pump
  • Clean-out valve
  • Level indicator

• Pump Capacity Reference (Clause 2.2):

  • Flow: ≥ 200 l/min
  • Pressure: ~10 to 14 N/mm²

Key Formula for Tank Capacity

[ \text{Tank Capacity (L)} = \text{Pump Flow Rate (L/min)} \times 30 \text{ min} ]

Example:
[ 200 , \text{L/min} \times 30 , \text{min} = 6000 , \text{L} ]

Additional Notes

• Minimum 370 mm clearance for ladder access.
• Tank must facilitate easy maintenance and inspection.
• Epoxy coating ensures durability against water and chemicals.

flowchart LR
    WaterTank[Water Tank]
    Pump[High Pressure Pump]
    Strainer[Strainer on Outlet]
    Valve[Clean-out Valve]
    Level[Level Indicator]

    WaterTank --> Strainer --> Pump
    WaterTank --> Valve
    WaterTank --> Level

This ensures reliable operation and maintenance per IS 11387.

IS 11387 - Cover Specifications

• Material: 16 mm thick galvanized iron sheet.
• Application: Enclosure for engine, pump, and hose reel compartment.
• Design: Stream-lined cover to ensure protection and aerodynamics.

Key Points from Clause 2.7

Additional Notes

• The cover must be robust to protect mechanical parts from environmental exposure.
• Thickness ensures structural strength and durability.
• Galvanized iron provides corrosion resistance.

flowchart LR
    Engine --> Cover[16 mm GI Sheet Cover]
    Pump --> Cover
    HoseReel --> Cover
    Cover --> Protection[Protection & Streamlined Design]

This ensures the mechanical components are safely enclosed and protected from dust, moisture, and mechanical damage as per IS 11387 requirements.

IS 11387: Suction Device for High Pressure Jetting Machine

Key Points from IS 11387

• Suction Device Purpose (Clause 2.9):
  Used to suck sludge from manholes and transfer it to a container.

• Operation (Clause 3.1):

  • High-pressure water jet is introduced via hose through manholes to clear blockages.
  • Silt and debris are removed by water pressure and lifted manually or by the suction device.
  • Fig. 1 (not provided) illustrates the jetting machine with suction unit.

Specifications & Guidelines

• Performance:
  The suction device must efficiently remove sludge and debris post jetting.

• Design Considerations:

  • Suction capacity should match sludge volume and pipe size.
  • Hose diameter and nozzle size influence suction efficiency.
  • Materials must resist corrosion and abrasion due to sludge.

Typical Parameters (General Engineering Knowledge)

Formula: Suction Flow Rate (Q)

[ Q = A \times V ]

Where:

• (Q) = Flow rate (m³/s)
• (A) = Cross-sectional area of hose (m²) = (\pi d^2/4)
• (V) = Velocity of sludge in hose (m/s)

flowchart LR
    A[Manhole] -->|Suction Hose| B[Suction Device]
    B --> C[Sludge Container]
    A -->|High Pressure Jet| D[Blocked Sewer]
    D -->|Debris Removed| A

Summary: IS 11387 defines the suction device as essential for sludge removal in sewer cleaning. Design must ensure compatibility with jetting pressure and sludge volume for effective operation.

IS 11387: Standard Accessories & Spares for Sewer Cleaning Units

Key Standard Accessories (Clause 3.1)

Each unit must include:

• 3 sewer cleaning nozzles with varying rearward angles (to adapt to different cleaning needs)
• 1 nozzle extension for easy hose and nozzle attachment
• 2 top tank strainer elements (to prevent debris entry)
• 2 sets of operation & service manuals plus spare parts lists
• 1 hose guide to facilitate hose handling

Spares Supplied (Clause 3.2)

• 4 reels of hose pipe, each 100 m long
• Set of spares sufficient for 3 years of operation

Practical Notes:

• Varying rearward angles typically range between 15° to 30° for effective cleaning.
• Hose diameter and pressure ratings should comply with the unit's operating pressure (usually 150-300 bar).
• Manuals include maintenance schedules and troubleshooting guides.

flowchart LR
  A[Unit] --> B[3 Sewer Cleaning Nozzles]
  A --> C[1 Nozzle Extension]
  A --> D[2 Top Tank Strainers]
  A --> E[2 Sets Manuals & Spare Lists]
  A --> F[1 Hose Guide]
  A --> G[4 Hose Reels (100m each)]
  A --> H[3-Year Spares Set]

This ensures full operational readiness and maintenance support per IS 11387.

IS 11387: Instructions Manual & Operation Guidelines Summary

Key Specifications (Clauses 2.5, 3.1, 3.2, 4.1)

• Standard Accessories (3.1):

  • 3 sewer cleaning nozzles (varying rearward angles)
  • 1 nozzle extension for hose/nozzle fixing
  • 2 top tank strainer elements
  • 2 sets operation & service manuals + spare parts lists
  • Hose guide

• Spares (3.2):

  • 4 reels of hose pipe (100 m each)
  • Spares for 3-year operation

• Control Panel Instruments (2.5):

  • Engine ignition switch, oil pressure & temperature gauges
  • Throttle, glow plug button
  • Sight glasses for water tank level + low-level warning light
  • Water pressure gauge & flow control valve
  • Hose reel speed & direction control lever
  • Low water level & oil pressure safety switches

• Operation Instructions (4.1):

  • Hose winding by power operation only
  • Flush water system emptied post-operation

Important Notes:

• High-pressure piping must use high-quality tubing with steel forged fittings.
• Manuals must detail safe operation, maintenance, and emergency procedures.

Control Panel Layout (Conceptual)

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, efficient operation and maintenance of sewer jetting machines per IS 11387.