Sign In


Forgot Password?

Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.


Have an account? Sign In Now

Sorry, you do not have permission to ask a question, You must login to ask a question. Please subscribe to paid membership


Forgot Password?

Please subscribe to paid membership

Please briefly explain why you feel this question should be reported.

Please briefly explain why you feel this answer should be reported.

Please briefly explain why you feel this user should be reported.

Sign InSign Up

Vacuum Furnace End-User Q&A Community

Vacuum Furnace End-User Q&A Community Logo Vacuum Furnace End-User Q&A Community Logo

Vacuum Furnace End-User Q&A Community Navigation

  • Home
  • About Us!
  • FAQ Blog
  • Resources
    • Free to Join
    • Answer it Forward
    • What is an FAQ Blog Post?
  • Contact Us
Search
Ask A Question

Mobile menu

Close
Ask a Question
  • Home
  • Categories
  • Questions
    • New Questions
    • Trending Questions
  • FAQ Blog
  • Groups
  • Tags
  • Points Rewards
  • Users
  • Help
  • Home
  • About Us!
  • FAQ Blog
  • Resources
    • Free to Join
    • Answer it Forward
    • What is an FAQ Blog Post?
  • Contact Us

Ask | Share | Growβ„’ - Question & Answer Community

Of the Members, By the Members, For the Members!
VacuumFurnaces.com is a Q&A community where vacuum furnace product and service suppliers connect with commercial and captive heat treaters to share their practical skills and know-how and to establish valuable relationships around niche topics of expertise with vacuum furnace end-users in operations, production, training, maintenance, marketing, sales, and engineering.

Login
Home/Diffusion Pumps

Vacuum Furnace End-User Q&A Community Latest Questions

Answer it Forward Challenge
  • 0
Answer it Forward Challenge
Asked: February 28, 2023In: Diffusion Pumps

Why diffusion pump doesn’t work properly?

  • 0

There is a brazing vacuum furnace that we are currently using. We are experiencing various problems with it. We think that it is probably due to diffusion pump. All gaskets were renewed, difussion oil was replaced with new one. Control tests were ...

diffusion pump
  1. Answer it Forward Challenge Official Account of VacuumFurnaces.com
    Added an answer on November 1, 2024 at 1:33 pm
    This answer was edited.

    If your diffusion pump is not working properly, several potential issues could be affecting its performance. Here’s a list of common causes and diagnostic steps: 1. Insufficient Heating Issue: The diffusion pump relies on heating the oil to create vapor jets, which then carry away gases. If the heatRead more

    If your diffusion pump is not working properly, several potential issues could be affecting its performance. Here’s a list of common causes and diagnostic steps:

    1. Insufficient Heating

    • Issue: The diffusion pump relies on heating the oil to create vapor jets, which then carry away gases. If the heater is malfunctioning or not reaching the proper temperature, the oil won’t vaporize correctly.

    2. Cooling System Problems

    • Issue: Diffusion pumps require adequate cooling to condense oil vapors back to liquid form. If cooling is insufficient or blocked, the pump may overheat, leading to inefficient operation or even backstreaming of oil.

    3. Contaminated or Incorrect Diffusion Pump Oil

    • Issue: If the oil is degraded, contaminated, or the wrong type, it can cause backstreaming, poor performance, or even pump failure.

    4. Improper Venting or Isolation

    • Issue: If the pump is not properly isolated from the system or not vented correctly, it could allow air to enter, reducing the vacuum level.

    5. Faulty Diffusion Pump Valve or Interlock System

    • Issue: Sometimes, a malfunctioning valve or an interlock can prevent the diffusion pump from operating correctly. This can result in the pump not engaging properly or being stuck at a higher pressure.

    6. Leaks in the Vacuum System

    • Issue: Leaks in the system can prevent the diffusion pump from achieving low pressures. Even small leaks can significantly impact performance.

    7. Backstreaming of Oil

    • Issue: Backstreaming occurs when oil vapor moves in the opposite direction and can reach the vacuum chamber, contaminating the system and reducing pump effectiveness.

    8. Obstructions or Contamination in Pump Lines

    • Issue: Dirt, residues, or contaminants in the pump’s internal channels or outlet can reduce the efficiency of the vapor jet and restrict gas flow.

    9. Improper System Pressure Staging

    • Issue: Diffusion pumps are designed to work only within specific pressure ranges. Starting the diffusion pump while the chamber is at too high a pressure can impair its function.

    By working through these potential causes you can systematically eliminate common diffusion pump issues and restore efficient operation in your vacuum system.

    See less
    • 0
    • Share
      Share
      • Share onFacebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  • 1 Answer
  • 213 Views
Answer
Answer it Forward Challenge
  • -1
Answer it Forward Challenge
Asked: March 1, 2021In: Diffusion Pumps

How to check heater power input in diffusion pump?

  • -1

heater power unit
  • 0 Answers
  • 32 Views
Answer
Answer it Forward Challenge
  • 0
Answer it Forward Challenge
Asked: February 28, 2021In: Diffusion Pumps

How to check heater power input in diffusion pump?

  • 0

heater power unit
  • 0 Answers
  • 29 Views
Answer
Answer it Forward Challenge
  • 0
Answer it Forward Challenge
Asked: February 25, 2021In: Diffusion Pumps

How often does one need to change the oil in a diffusion pump?

  • 0

diffusion pump oil
  • 0 Answers
  • 43 Views
Answer
Answer it Forward Challenge
  • 0
Answer it Forward Challenge
Asked: February 25, 2021In: Diffusion Pumps

How does a diffusion pump work?

  • 0

diffusion pump
  1. Ryan
    Added an answer on March 13, 2023 at 8:24 pm

      I have provided a diagram above to aid in this answer. The diffusion pump is a very common mechanism for creating a high vacuum. Generally, the pump contains three cone-shaped pressure jets stacked vertically. There is pump oil at the bottom that is heated until it reaches a gaseous state. InRead more

     

    I have provided a diagram above to aid in this answer. The diffusion pump is a very common mechanism for creating a high vacuum. Generally, the pump contains three cone-shaped pressure jets stacked vertically. There is pump oil at the bottom that is heated until it reaches a gaseous state. In the gaseous state, the oil will travel upward and exit through pressure jets in a downward direction. As the vapor travels towards the walls, it will trap air molecules that enter the pump through diffusion. With the cooling coils on the walls, the vapor will immediately condense, releasing the trapped air molecule at a lower position. The oil will travel back to the heater where the process will continue, and the air molecule will be removed via the backing pump and thus creating the high vacuum.

    See less
    • 1
    • Share
      Share
      • Share onFacebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  • 1 Answer
  • 118 Views
Answer
Load More Questions

Sidebar

Stat

  • Questions 1k
  • Answers 210
  • Best Answers 0
  • Users 73

Top Members

Greg Kimble

Greg Kimble

  • 281 Points
AlessiaP

AlessiaP

  • 103 Points
Thomas

Thomas

  • 73 Points
patrickduis

patrickduis

  • 60 Points
rcauthon

rcauthon

  • 58 Points
Show More

Questions Categories

Vacuum Pumps
119Questions
, 3Followers
Thermocouples
73Questions
, 7Followers
Diffusion Pumps
70Questions
, 4Followers
Vacuum Technology
64Questions
, 4Followers
Leak Checking, Testing & Detection
55Questions
, 6Followers
Gauges - Vacuum
46Questions
, 3Followers
Vacuum Pressure
40Questions
, 2Followers
Vacuum Furnaces
36Questions
, 4Followers
Standards, Certifications & Accreditations
32Questions
, 1Follower
Hot Zone - Heating Elements
30Questions
, 4Followers
Quench Cooling System
29Questions
, 0Followers
Water Cooling Systems
25Questions
, 1Follower
Process Control System
24Questions
, 2Followers
Vacuum Seals & O-Rings
24Questions
, 1Follower
Instruments - Vacuum
19Questions
, 0Followers
Vacuum Processing
17Questions
, 0Followers
Instruments - Leak Testers
17Questions
, 0Followers
Vacuum Brazing
17Questions
, 4Followers
Temperature Uniformity Survey (TUS)
15Questions
, 3Followers
Instruments - Measurement
14Questions
, 1Follower
Heat Exchanger
13Questions
, 0Followers
Partial Pressure
12Questions
, 1Follower
Backstreaming
12Questions
, 1Follower
System Accuracy Test (SAT)
11Questions
, 2Followers
Baskets, Fixtures & Racks
10Questions
, 1Follower
Sensors - Pressure
10Questions
, 0Followers
Hot Zone - Refractory
9Questions
, 0Followers
Control System - Temperature
9Questions
, 1Follower
Backfilling
9Questions
, 1Follower
Components, Supplies & Materials
8Questions
, 0Followers
Instrumentation & Testing
8Questions
, 0Followers
Hot Zone - Insulation, Heat Shield
8Questions
, 0Followers
Outgassing
8Questions
, 1Follower
Heating Chamber - Hot Zone
8Questions
, 0Followers
Getter Materials
8Questions
, 0Followers
Vacuum Pumping System
8Questions
, 0Followers
Cold Traps
7Questions
, 0Followers
Roughing Pumps
6Questions
, 0Followers
Power Supply
6Questions
, 0Followers
Control System - Programming
6Questions
, 1Follower
Bakeout
6Questions
, 0Followers
Gauges - Pressure
6Questions
, 0Followers
Horizontal Vacuum Furnaces - Batch
5Questions
, 1Follower
Instruments - Calibration
5Questions
, 0Followers
Tubes, Pipes & Fittings
5Questions
, 0Followers
Residual Gas Analyzer (RGA)
5Questions
, 0Followers
Carburizing
5Questions
, 0Followers
Vertical Vacuum Furnaces - Batch
4Questions
, 0Followers
Cryogenic Pumps
4Questions
, 0Followers
Instruments - Detection
4Questions
, 0Followers
Metallurgy
4Questions
, 1Follower
Instruments - Pressure
4Questions
, 0Followers
Instruments - Analyzers
4Questions
, 0Followers
Hot Zone - Fixtures & Supports
4Questions
, 0Followers
Pressure Vessel (Shell-Tank)
3Questions
, 0Followers
Quenchants - Gases
3Questions
, 0Followers
Control System - Vacuum
3Questions
, 0Followers
Recorders
3Questions
, 1Follower
Data Acquisition
3Questions
, 0Followers
Valves
3Questions
, 0Followers
Instruments - Monitoring
3Questions
, 0Followers
Instruments - Temperature
3Questions
, 1Follower
Gas Quench Systems
3Questions
, 0Followers
Oil Quench Vacuum Furnaces
2Questions
, 0Followers
Hearth Assembly & Rails
2Questions
, 0Followers
Holding Pumps
2Questions
, 1Follower
Gas Supply System
2Questions
, 0Followers
Gas Generators
2Questions
, 0Followers
Controllers
2Questions
, 1Follower
Controller Software
2Questions
, 0Followers
Manifolds
2Questions
, 0Followers
Parts Cleaning Equipment
2Questions
, 0Followers
Electrical
2Questions
, 1Follower
Pyrometry
2Questions
, 2Followers
Flanges
2Questions
, 0Followers
Gauges - Mechanical
2Questions
, 0Followers
Vacuum Measurement
2Questions
, 0Followers
Integral Quench Vacuum Furnaces
1Question
, 0Followers
Booster Pumps
1Question
, 0Followers
Quench Nozzles
1Question
, 0Followers
Gas Storage Tanks & Vessels
1Question
, 0Followers
Loaders & Tracks
1Question
, 0Followers
Flowmeters
1Question
, 0Followers
Data Loggers
1Question
, 0Followers
Nitriding
1Question
, 0Followers
Health & Safety Protection
1Question
, 1Follower
Control System – Recording
1Question
, 1Follower
Control System – Testing
1Question
, 0Followers
Backfill Gases
1Question
, 0Followers
Vacuum Pump Maintenance
1Question
, 0Followers
Vacuum Pump Performance Checks
1Question
, 0Followers
Semi & Continuous Vacuum Furnaces
0Questions
, 0Followers
Other Vacuum Furnaces
0Questions
, 0Followers
Elevator System
0Questions
, 0Followers
Hydraulic Power Units
0Questions
, 1Follower
Tank Base Assembly
0Questions
, 0Followers
Pump Chillers
0Questions
, 0Followers
Quench Blower Assembly
0Questions
, 0Followers
Baffles
0Questions
, 0Followers
Water Tank Assembly
0Questions
, 0Followers
Cooling Towers
0Questions
, 0Followers
Parts Handling Equipment
0Questions
, 0Followers
Electric Motors
0Questions
, 0Followers
Actuators
0Questions
, 0Followers
Other Sub-Systems
0Questions
, 0Followers
Hydraulics
0Questions
, 0Followers
Mechanical
0Questions
, 0Followers
Pneumatics
0Questions
, 0Followers
Solenoids
0Questions
, 0Followers
Vacuum Meters
0Questions
, 0Followers
Vacuum Furnace Maintenance
0Questions
, 1Follower
Other
0Questions
, 0Followers
Control System
0Questions
, 1Follower
Instruments - Sensors
0Questions
, 0Followers
Vacuum Valves
0Questions
, 0Followers
Feedthrus
0Questions
, 0Followers
Pressure Relief Valves
0Questions
, 0Followers
Control System – Calibration
0Questions
, 0Followers
Gas Surge Tanks
0Questions
, 0Followers
Work Preparation & Handling
0Questions
, 1Follower
Fixturing Techniques
0Questions
, 0Followers
Heating Chamber – Hot Zone Construction
0Questions
, 0Followers
Vacuum Measurement Systems
0Questions
, 0Followers
Sensors – Vapor Pressure
0Questions
, 0Followers
Mean Free Path
0Questions
, 0Followers
Leak Repair
0Questions
, 0Followers
Eutectic Melting
0Questions
, 1Follower
Cycle Recipe Design
0Questions
, 0Followers
Preheating, Soaking & Ramp Rates
0Questions
, 0Followers
Heat Exchanger Maintenance
0Questions
, 0Followers
Maintenance Procedures
0Questions
, 0Followers
Vacuum Seals & O-rings Maintenance
0Questions
, 0Followers
Cleaning of Parts
0Questions
, 0Followers
Cleaning of Fixtures
0Questions
, 0Followers
Vacuum Furnace Systems & Design
0Questions
, 0Followers
Heat Exchanger Design
0Questions
, 0Followers
Basket, Fixture & Rack Design
0Questions
, 0Followers
Vacuum Furnace Construction
0Questions
, 0Followers
Hot Zone & Refractory Designs (Carbon & Metal)
0Questions
, 0Followers
Gas Quench System Design
0Questions
, 0Followers
Water Cooling System Design
0Questions
, 0Followers
Pumping System Design
0Questions
, 0Followers
Gas Nozzles & Hearth Design
0Questions
, 0Followers
Vacuum Furnace Installation & Commissioning
0Questions
, 0Followers
Vacuum Furnace Decommissioning
0Questions
, 0Followers
Plant Safety & Best Practices
0Questions
, 0Followers
Vacuum Heat Treat Applications
0Questions
, 0Followers

Explore

  • Home
  • Categories
  • Questions
    • New Questions
    • Trending Questions
  • FAQ Blog
  • Groups
  • Tags
  • Points Rewards
  • Users
  • Help

Footer

VacuumFurnaces.com

A mobile and online question-and-answer directory for vacuum furnace end-users, commercial and in-house vacuum heat treaters, and equipment, product, and service suppliers. Our knowledge networking platform allows for professional connections on the basis of asking questions, finding answers, and sharing common goals and pursuits in the best interests of all our members.

About Us

  • About Us!
  • FAQ Blog
  • Resources
    • Free to Join
    • Answer it Forward
    • What is an FAQ Blog Post?
  • Contact Us
  • Sitemap

Legal Stuff

  • Terms & Conditions
  • Privacy Policy

Help

  • Membership Benefits
  • Support

Follow

© 2023 Discy. All Rights Reserved

We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.Ok