Used 2011 Nitrogen Unit

Type: Used

Condition: Very Good

Location: Houston, TX

Used 2011 Nitrogen Unit

MODEL WNT-181601 TRAILER-MOUNTED, COMBINATION NITROGEN AND FLUID PUMPING UNIT

1.0 DESCRIPTION

The Stewart & Stevenson WNT-181601 combines a 180 SCFH nitrogen vaporization and pumping system with a 600 HP fluid pumping system in a trailer-mounted package. The Stewart & Stevenson non-fired nitrogen system uses the engine (glycol/water) coolant system to pass heat from the engine and hydraulic system to the liquid nitrogen using a high-pressure heat exchanger. The fluid pumping system uses a diesel engine to drive a high-pressure piston pump through a transmission.

Used 2012 Nitrogen Unit for Sale

Performance Specifications

NITROGEN VAPORIZING AND PUMPING SYSTEM

Maximum allowable working pressure 10,000 PSI 69.0 MPa

Maximum flow rate 3,000 SCFM 85.0 standard m3/min

Maximum liquid storage 2,038 gal 7.72 m3

FLUID PUMPING SYSTEM

Pump rating 600 HP 447 kW

Pump piston diameter 3.5” 89 mm

Maximum working pressure 10,250 PSI 70.0 MPa

Maximum fluid rate 320 gal/min 1200 l/minThe combination unit consists of:

- A heavy-duty trailer

- One control cabin

- Two diesel engines

- A hydraulic system

- One triplex nitrogen pump

- Vaporizer and heat exchangers

- One nitrogen boost pump

- One nitrogen storage tank

- One automatic transmission

- One triplex fluid pump

- Fluid boost and fill centrifugal pumps

- One fluid displacement/holding tank

- High and low pressure piping

- All necessary valves and controls for normal operation

To eliminate contamination between the two systems, the fluid and nitrogen systems have separate plug valves.

Approximate Dimensions

Length 44’ 6” 13.6 m

Width 8’ 6” 2.6 m

Height 13’ 5” 4.1 m

Weight† 73,500 lbs 33,350 kg

† - Nitrogen tank empty

1.1 TRAILER

The trailer is a tandem axle heavy-duty twin rail trailer with the following features:

- Stewart & Stevenson design

- T1 Construction

- Single drop, twin rail

- Tandem axle (spread axle required for bridge law)

- Air ride suspension

- ABS brakes, air type

- Mud flaps

- 2 speed landing legs

- Lights for highway use

- Front and rear fenders

- 24 volt electrical system

1.2 CONTROL CABIN

The unit is fully operational from this control cabin via mechanical, hydraulic, pneumatic and

electrical controls. The cabin is approximately 6’ wide x 4’ deep x 6’-10” high and is lined and fully insulated. The cabin has one side-entry locking door, sliding side window and large windows in the front and rear.

The control cabin contains all necessary controls and gauges (a portion of the following engine gauges are in the electronic display module on the panel). The cabin is climate controlled.

Standard equipment includes:

- Air conditioning and heating unit

- Heavy duty rubber insulated floor, fire resistant

- Four work lights (two at the rear and two at the front)

- Interior lights

- Work light switch

- Air pressure gauge

- Air horn button

- Battery voltage

- Fuel gauge

Each engine has a control and monitoring section in the control console featuring:

- Engine start/stop

- Emergency kill

- Engine oil pressure gauge

- Engine water temperature gauge

- Engine tachometer

- Engine diagnostic request light

- Engine diagnostic connection

- Engine throttle

The nitrogen system is controlled and monitored from a dedicated control panel. The by-pass valve and the temper valve are accessible from inside the control cabin. The nitrogen system control and monitoring panel includes:

- Valve actuator controls

- Triplex pump charge pressure

- Triplex pump hydraulic pressure

- Triplex rate and total

- GN2 discharge pressure

- GN2 temperature

- Lube pump hydraulic pressure

- Triplex pump lube oil pressure

- Triplex pump lube oil temperature

- Boost pump hydraulic pressure

- Boost pump speed control

- Boost pump discharge pressure

- Triplex pump suction pressure

- Coolant pump hydraulic pressure

- Coolant pump discharge pressure

- Coolant system temperature

- Hydraulic oil temperature

- Heat builder hydraulic pressure

- Heat builder pressure adjustment control

The fluid pumping system is controlled and monitored from a dedicated control panel. The fluid pumping system control and monitoring panel includes:

- Transmission oil pressure

- Transmission oil temperature

- Transmission shifter

- Transmission lock-up pressure

- Lock-up indicator lamp

- PTO engage switch

- Triplex fluid rate and total

- Fluid discharge pressure

- Triplex lube oil pressure

- Triplex lube oil temperature

- Centrifugal pump hydraulic pressure

- Centrifugal pump speed controls

- Valve actuator controls

- Process schematic

- Discharge valve actuator control

1.3 NITROGEN VAPORIZING AND PUMPING SYSTEM

This unit is capable of pumping up to 180,000 SCFH of gaseous nitrogen with pressures up to 10,000 PSI and at discharge temperatures of 70 F. A hydrostatic hydraulic pump drives the cryogenic triplex pump in a closed-loop system. The front pump of a double hydraulic pump drives the water, and triplex lube pumps. The rear pump of a double hydraulic pump drives the cryogenic boost pump.

The liquid nitrogen is taken from the nitrogen storage/transport tank by a centrifugal boost pump and passed through a strainer to a high-pressure LN2 triplex pump. The Stewart & Stevenson system uses the engine (glycol/water) coolant system to pass the heat from the engine and hydraulic system to the liquid nitrogen.

The amount of heat generated by the diesel engine varies with the nitrogen discharge flow rate of this unit and the sequence valve pressure located in the closed-loop triplex pump drive circuit. Engine load increases linearly with triplex pump discharge and sequence valve pressure until the maximum load is achieved at maximum discharge rate and maximum sequence valve pressure. A nitrogen-tempering line is installed across the nitrogen heat exchangers from the liquid nitrogen input to the gaseous nitrogen output to assist in regulating the GN2 temperature.

Important Buyers Notice: All items are Sold As-Is with No Warranty expressed or implied. Items offered for sale may be damaged, inoperable and/or missing parts. You are strongly urged to carefully review each photo and video as well as personally inspect the item before making a decision to purchase. Free Oilfield Quote is not responsible for any missing or damaged equipment, part, item or accessory and shall not be held liable for any damage prior to or during the removal and/or delivery of the equipment. Any and all agreements contrary to the above disclaimer must be in writing and agreed upon up front and prior to any transaction.