Below Ground

The first and only below ground hydraulic cylinder in the industry. Designed for the most sensitive of applications.
Features & Benefits
HRP International's Below Ground Hydraulic Cylinder is the first and only underground cylinder in the industry. The cylinder's advance sealing technology is also a world's first.

The Hydraulic Cylinder's construction is sturdy and light and don't require a pedestal on the well head for installation. Guide wires are not required to stabilise the cylinder. We use an optional tripod stabilizer to limit sway / harmonics. 

The Hydraulic Cylinder also withstands high winds up to 60 knots and are installed in areas that experience cyclones and hurricanes.

Features & Benefits

For highly sensitive areas

Slower traveling speeds, reduced rod string fatigue.

Near-fixed traveling speeds resulting in lower rod string compression.

Reduced traveling/standing valve wear.

Higher compression ratios, which helps reduce gas locking.

Better mechanical efficiency (stroke vs. stretch ratio).

Longer tubing life due to longer coupling-to-tubing wear patterns.

Ability to lift larger pump plungers = higher volume rate capacities.

No more stuffing box leaks

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No Pedestal, Support or Wiring needed

Installs in less time than a walking beam horsehead, bridle and carrier bar. 


Unlike most hydraulic cylinders in the market, the HRP hydraulic cylinder requires no pedestal or guide wire supports. 


There are also no sensors needed on the cylinder for position and load calculations, which is done through the sensors on the power unit. 

Lower CAPEX for the same production

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Specifications

We have a wide range of cylinder sizes & stroke lengths to cater for most applications.

Stroke Length 

36, 60, 86, 120, 240, 336 (inches)

Cylinder Sizes

2.5, 3.0, 3.5, 4.0, 4.5. 5.0 (inches)

Peak Polished Rod Load (PPRL)

up to 53,376 lbs

Design Pressure & Temperature

design pressure 5000 psi
design temperature 150 deg C

Cylinder Sizes & PPRL Ratings

Cylinder Size (Bore x Stroke) Max PPRL (@ 3000 psig) Extended Length Collapsed Length
2.5" x 240" 12,363 527" (44') 287" (24')
3.0" x 240" 18,840 527" (44') 287" (24')
3.5" x 240" 25,169 527" (44') 287" (24')
3.5" x 288" 25,169 623" (52') 335" (28')
3.5" x 366" 25,169 719" (60') 383" (32')
4.0" x 240" 34,000 527" (44') 287" (24')
4.0" x 288" 34,000 623" (52') 335" (28')
4.0" x 336" 34,000 719" (60') 383" (32')
4.5" x 240" 42,390 527" (44') 287" (24')
4.5" x 228" 42,390 623" (52') 335" (28')
4.5" x 336" 42,390 719" (60') 383" (32')
5.0" x 336" 53,376 719" (60') 383" (32')