Existent Gum in Fuels by Jet Evaporation

Test Method:
Gum formed during fuel storage can deposit on induction system surfaces, intake valves, stems and guides. To test for gum content, a 50mL sample is evaporated in an aluminum block bath for a specified period under controlled conditions of temperature and flow of air (aviation and motor gasolines) or steam (aircraft turbine fuel).

Existent Gum Test Apparatus

Existent Gum Test Apparatus
Evaporates aircraft turbine fuel and motor and aviation gasoline samples under controlled conditions in accordance with ASTM specifications. Consists of a high temperature evaporation bath with 100mL test beakers and, for aircraft turbine fuels, a steam generator and steam superheater.

Evaporation Baths
•Conforming to ASTM D381 and related specifications

•Choice of three-unit and six-unit models

•Safety top assembly allows for easy positioning and connection of all conical adapters to the bath

•Digital flowmeter for accurate and precise air flow measurement

•Available with built-in steam superheater

•Microprocessor programmable high accuracy temperature control

•Built-in pressure regulator

Electrically heated baths for determining existent gum in aircraft turbine fuels by steam-jet evaporation and in motor and aviation gasolines by air-jet evaporation. Fully insulated, aluminum block design assures safe, efficient high temperature operation. Equipped with air/steam pressure regulator with gauge and a digital flowmeter for adjusting air flow per ASTM specifications. Stainless steel jets deliver air or steam flow to the test wells through removable brass conical adapters. Microprocessor PID control provides quick temperature stabilization without overshoot, and the bath is protected by an overtemperature control circuit that interrupts power should bath temperature exceed a programmed cut-off point. Dual LED displays provide actual and setpoint temperature values in °C/°F format. Communications software (RS232, etc.), ramp-to-set and other enhanced features are available as extra cost options. Contact your Koehler representative for information.

Model K33900 with Built-in Superheater–Six-unit bath with a built-in thermostatically controlled superheater which delivers dried steam to the bath inlet for steam-jet method testing of aircraft turbine fuels. Has digital indicating solid state bath temperature control with digital setpoint and display.

Model K33950–Six-unit bath without built-in superheater.

Model K33780–Three-unit bath without built-in superheater.

Conforms to the specifications of: ASTM D381; IP 131; ISO 6246; DIN 51784;
FTM 791-3302; NF M 07-004
Testing Capacity:
K33900 and K33950: 6 sample beakers
K33780 and K33781: 3 sample beakers
Maximum Temperature: 475°F (246°C)
Temperature Control Stability: ±1°F (±0.5°C)
Bath Configuration: machined aluminum block with multiple cartridge heaters
Heater Range:
K33900 and K33950: 0-3000W
K33780 and K33781: 0-1500W
Superheater: (Model K33900 only)
Superheating chamber and condensate trap constructed of stainless steel
Solid state thermoregulator (0-550°F) Heater Range: 0-3000W

Electrical Requirements
K33950: 220-240V 50/60Hz, Single Phase, 30A
K33900: 220-240V 50/60Hz, Single Phase, 30A
K33780: 115V 60Hz, Single Phase, 13.0A
K33781: 220-240V 50/60Hz, Single Phase, 6.8A

Included Accessories
Conical Brass Adapters for air/steam jets

Dimensions wxdxh,in.(cm)

Net Weight:
K33900: 21”x20.5”x28” (53.34×52.07×71.12) K33900: 230 lbs (104.3kg)
K33780: 32.5x11x19 (83x28x48) K33780: 85 lbs (38.6kg)
K33950: 21”x20.5”x28” (53.34×52.07×71.12) K33950: 203 lbs (92.1kg)

Shipping Information
K33900 Shipping Weight: 313 lbs (142kg) Dimensions: 17.2 Cu. ft. K33780 Shipping Weight: 140 lbs (63.5kg) Dimensions: 8.3 Cu. ft. K33950 Shipping Weight: 271 lbs (123kg) Dimensions: 13.7 Cu. ft

Steam Generator
• For steam-jet method testing of aircraft turbine fuels
• Meets output requirements of three-unit and six-unit evaporation baths
• Electrically heated for clean, efficient operation and ease of installation
• Meets applicable ASME, NEC standards; UL listed, CSA approved

Electrically heated boiler provides instantaneous and reserve steam capacity for steam-jet evaporation tests. Easy to install and operate; electrical heating eliminates the need for on-site fuel combustion. Requires only a water feed source and electrical hook-up. Ruggedly constructed, with long life industrial grade incoloy heating element. Includes a full range of safety features: automatic water level control and low water cut-off; steam safety valve; high-limit pressure cut-out with manual reset; steam pressure gauge.

Output: 54.1 lbs steam/hr at 212°F
Bhp Rating: 1.83
kW Rating: 18

20x28x36 (51x71x91)
Net Weight: 185 lbs (83.9kg)

Shipping Information
Shipping Weight: 200 lbs (91kg)
Dimensions: 18 Cu. ft.