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Lightweight Polyflex Hydrant Pit - HPA Series

Liquip offers a range of Polyflex hydrant Pits that are light weight and environmentally friendly. Liquip's HPA series hydrant pits have been designed to exceed the extremely high loads and standards set down by the aviation industry.

The future of hydrant pit technology is here now and available in the form of the Liquip Polyflex Hydrant Pit complete with aluminium lid. With a primary focus on health and safety, environmental and commercial considerations, the Liquip series Polyflex hydrant pits are up to one quarter the weight of conventional pits, providing a nonconductive, seamless, advanced sealing pit at an attractive price.

You’ll save money right from the initial purchase, from shipping, to installation, and throughout the life of the pit with easy maintenance and improved product retention in case of spills or drips. The durable long lasting pit body is a high-tech polyethylene one-piece construction with a cast aluminium rim fitted into the body to provide a liquid tight bond.

The Liquip Polyflex Hydrant Pit will hold up to 100 litres (for a 24” pit) of product with the valve in place – up to 45 litres before the first possible leak point which is the join between the bellows and riser pipe. There are no separate seals as the bellows are moulded with the body, which is electrically non-conductive and consumes no cathodic protection power.

Liquip hydrant pits can be used with Hydrant valves e.g. Cla-val or High Valve and Low Point Draining assemblies e.g. Liquip's HLV-150-300 series.

Our Hydrant pit designs have been proven at airport installations in countries all over the world including: Australia, New Zealand, Singapore and Brazil

  • Liquip's HPA series Polyflex hydrant pits are up to one quarter the weight of conventional pits and provide a non-conductive, seamless, advanced-sealing hydrant pit solution.
  • The Liquip Polyflex Hydrant Pit is the lightest pit/lid combination in the world for aviation fuel hydrant systems 
  • Hydrant pits comes complete with a lightweight lid which offers easy maintenance.
  • The HPA series provides an environmentally sealed container for aircraft runways where fuelling and inspection access is required.
  • Body is electrically non-conductive, consumes no cathodic protection power.
  • HPA Series pits have an angled floor (sloped bottom) to ensure fluid build-up in the pit is drained to one side so it is immediately noticeable and easier to clean.
  • The pit body is a high tech non-corroding polyethylene hybrid.
  • Automatic latches similar to a door latch provide guaranteed latching when the lid is in place.
  • The whole pit body and integral bellows is entirely seamless with the pit rim fitted into the pit while hot from the mould to provide a liquid tight shrink bond.
  • The extended bellows provides a perfect sealing face for a 100mm ANSI 150lb or 150mm ANSI 300lb flange both with blind tapped holes. Both also with integral seal fitted, available from Liquip.
  • Liquip’s flanges include an integral seal for easy installation.
  • The pit will hold a significant amount of product before the first possible leak point.
  • A stainless steel bonding strap provides the electrical bond between the riser pipe and the pit rim.
  • Available in 2 sizes: 600mm diameter (24”) with inner and outer lid and 450mm diameter (18”) with single lid, the Liquip Polyflex Hydrant Pit offers huge savings in the initial purchase, not to mention the associated handling costs which are also saved.
  • Hydrant pits can be supplied with a heavy duty tether allowing full rotation & manipulation of the lid whilst keeping it securely connected.
  • Hydrant pits can be supplied with a heavy duty tether that can rotate on a 360° plane.

The below technical data is an excerpt of information available and further information can be found under the resources tab.

Materials
All covers and rims are cast aluminium AA601 (Heat treated & aged T6 to protect against corrosion)
All light weight fasteners are stainless steel
Plastic components nylon
Pit body HDPE (non-conductive and UV stabilized for outdoor storage)
Top seals neoprene - all other seal viton
Flanges steel to ASTM A105 or SS316 to ASTM A182
Flange fasteners ASTM A193 B7 studs with ASTM A194 2H nuts or SS 316 B8M studs & Gr8 nuts

Standards
Compliant with EI1540.

Mounting
Suitable for special 100NB flanges & 100NB pit valves. Assembly set in concrete to individual contractor requirements. To be mounted with reference to Liquip’s installation instructions.

Tether
Can be supplied with pit retaining system/tether (PRS200 suits HPA2x0 and PRS300 suits HPA1x0) to comply with JIG requirements. 
Tether allows full rotation & manipulation of the lid whilst keeping it securely connected.

Bonding
Bonding kit available separately (HLC200-11).

Floor angle
Angled floor (sloped bottom).

Working Temperature Range
-40oC to +200oC.

Yield
18 MPa

Elongation
450%.

Flexural Modulus
690 MPa.

Weld neck
Entry point is designed for 100NB ANSI 150lb flange with blind threads or 150NB ANSI 300lb flange with blinds threads. These have a thick flange for improved sealing. They are fully sealed blind drilled and tapped stud holes, machine finish outside diameter and fastening point for bonding strap. The bonding strap runs from the pipe to the pit rim and is stainless steel.

Integral Bellows
The integral moulded bellows provides seamless flexibility to accommodate the riser pipe. The 24" pit retains 45 litres before the liquid level reaches the top of the bellows. The bellows has an extended top, allowing variable installation height and surplus can be trimmed back. Entry point is designed for either a 100mm ANSI 150lb flange with blind threads or 150mm ANSI 300lb flange with blind threads.

Lightweight Lid

Supplied with HLA100 as standard.

The HLA100 is the lightest pit lid on the market today which can still withstand the high forces and weights exerted by aircraft as set out in some specifications. It has an automatic self latching feature with single latch mechanism and an anti-slip top. It fits both the 18" and 24" pit.

An outer lid on the 24" lid can also easily be removed when a larger access area is required for maintenance purposes.

Operation
After installation of the pit assembly, drive your refueling vehicle to a suitable position where both the aircraft and the pit can be accessed by both hoses from the hydrant cart. With one hand lift the handle of the pit inner cover and draw towards you and the lid will de-latch, the inbuilt vacuum breaker is operated and the cover can be easily lifted free to allow access for the refueling hose adaptor from any angle. The valves are dry break and can be opened after connection of the adaptor and normal refueling operations carried out. To close the hydrant pit, slide the inner lid into place, the lid will latch under its own weight, but a light push with your foot will ensure safe connection.

Adjustment
All adjustments are made during installation. Seals and the under mount lid buffers on the pit cover should be inspected at 6 month intervals. Replace all seals and buffers as required.
Pits supplied with a removable outer cover provide a full 600mm access during valve and pipe repairs

Weight Comparisons
Conventional Steel Pit with lid, 18" = ~115kgs.
Conventional Steel Pit with lid, 24" = ~158kgs.
Conventional Al Lid = ~25kgs.
Total weight of Liquip HPA200 = ~75.5kgs.
Total weight of Liquip HPA250 = ~85kgs.
Total weight of Liquip HPA100 = ~32kgs.
Total weight of Liquip HPA150 = ~32kgs.

Hydrant Pit Body ID

Model Hydrant Pit Lid  OD Bellow Suits
Inner Outer
HPA100 18 - 100 NB riser flange
HPA150 18 - 150 NB riser flange
HPA200 18 24 100 NB riser flange
HPA250 18 24 150 NB riser flange

Hydrant Pit Box Assemblies

Item Number Description Supplied with
HLA100 Lid Lid Tether Pipe Flange Bonding Kit
HPA100 460mm diameter lightweight Hydrant pit assembly with integral bellows to accept a special 100 NB (4") 150lb flange & 100NB pit valves. The assembly comes complete with HLA100 lid. Y - - -
HPA100-PRS300 460mm diameter lightweight Hydrant pit assembly with integral bellows to accept a special 100 NB (4") 150lb flange & 100NB pit valves. The assembly comes complete with HLA100 lid. Also supplied with pit retaining system to suit HPA100 (tether). Y Y - -
HPA150 460mm diameter lightweight Hydrant pit assembly with integral bellows to accept a special 150 NB (6") 300lb flange & 100NB/150NB pit valves. The assembly comes complete with HLA100 lid. Y - - -
HPA150-PRS300 460mm diameter lightweight Hydrant pit assembly with integral bellows to accept a special 150 NB (6") 300lb flange & 100NB/150NB pit valves. The assembly comes complete with HLA100 lid. Also supplied with pit retaining system to suit HPA150 (tether). Y Y - -
HPA200 600mm diameter lightweight Hydrant pit assembly with integral bellows to accept a special 100 NB (4") 150lb flange & 100NB pit valves. The assembly comes complete with HLA100 lid and outer lid. Y - - -
HPA200-PRS200 600mm diameter lightweight Hydrant pit assembly with integral bellows to accept a special 100 NB (4") 150lb flange & 100NB pit valves. The assembly comes complete with HLA100 lid and outer lid. Also supplied with pit retaining system to suit HPA 200 (tether). Y Y - -
HPA250 600mm diameter lightweight Hydrant pit assembly with integral bellows to accept a special 150 NB (6") 300lb flange & 100NB/150NB pit valves. The assembly comes complete with HLA100 lid and outer lid Y - - -
HPA250-PRS200 600mm diameter lightweight Hydrant pit assembly with integral bellows to accept a special 150 NB (6") 300lb flange & 100NB/150NB pit valves. The assembly comes complete with HLA100 lid and outer lid. Also supplied with pit retaining system to suit HPA 250 (tether). Y Y - -

NOTE: For a complete pit solution, pipe flanges and bonding kits must be ordered separately (see Hydrant Pit Accessories below)

Hydrant Pit Accessories

Item Number Description
HLA100 18” Lightweight aluminium hydrant pit cover.
HLA100-5 Sealing O-ring cord to suit HLA100 lid.
HLC200-12  4" 150lb Carbon Steel Base flange to suit HPA100 & HPA200.
HLC200-12SS 4" 150lb Stainless Steel Base flange to suit HPA100 & HPA200.
HLC250-12 6" 300lb Carbon Steel Base flange (SCH40) to suit HPA150 & HPA250.
HLC250-12-SCH80 6" 300lb Carbon Steel Base flange (SCH80) to suit HPA150 & HPA250.
HLC250-12SS 6" 300lb Stainless Steel Base flange to suit HPA150 & HPA250.
HLC200-11 Bonding (grounding) kit wire for Polyflex Pits
HLC200-10 Seal for outer lid  to suit HPA2x0 series.
 

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