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Liquid Penetrant Testing (LPT) or Dye Penetrant Testing (DPT)

Liquid Penetrant Testing (LPT) Or Dye Penetrant Testing (DPT)

Liquid Penetrant Testing or Dye Penetrant Testing (LPT/DPT) is based on the principle of capillary action and is used to detect surface defects. Penetrant of low surface tension penetrates into cracks that are open to the surface. The liquid penetrant testing method gives the best sensitivity for surface defects and defects up to 0.1 inches can be identified. LPT is a low-cost surface inspection Nondestructive testing method and mostly used in most of the industries where the welding process is required such as Fabrication, Manufacturing, Casting, Forging, and Piping, etc.

Advantages of Liquid Penetrant Testing-

  •    LPT is used to inspect a wide range of materials.
  •    Liquid penetrant inspection is easy to perform.
  •    The visual image of the flaw is generated on the surface of part/product as indications are produced directly on the surface.
  •    Investment is low as compared to other NDT methods.
  •    It is a very portable inspection method as it comes in aerosol spray cans also.
  •    A large part or big area can be inspected with good speed and at a low cost.

Disadvantages of Liquid Penetrant Testing-

  •    Only surface defects get detected.
  •    Pre-cleaning is important as contamination may mast the discontinuities or defects.
  •    It is performed on relatively nonporous smooth material.
  •    Several operations are required under controlled conditions.
  •    Chemical handling with precaution is necessary (Toxic, Fire & Waste)
  •    Metal smearing is from machining, grinding and other operations may inhabit detection. Material may need to be etched prior to inspection.
  •    To remove chemicals, post-cleaning is important.

Know more about the upcoming training schedule, by clicking here. 

NDT Level I Liquid Penetrant Testing (LPT) Syllabus

  •    Basic principles on Liquid Penetrant Testing or Dye Penetrant Testing.
  •    Inspection and measurement of samples.
  •    Familiar with the scope and limitation of the method.
  •    Introduction to ASME standards and specifications.

After successful completion of training, participants will be appearing for the Level I exam.

Participants will be certified as NDT LPT Level I after successfully clearing the exam.

NDT Level II Liquid Penetrant Testing (LPT) Syllabus

  •    Introduction
  •    Principle of Penetrant Testing
  •    Equipment Involved Review and Exercises
  •    Liquid Penetrant Testing Procedures Workshop and Group discussion
  •    Materials
  •    Evaluation of Indication
  •    Application of Liquid Penetrant Testing
  •    HAZARDS Precautions
  •    Code Requirements Review and Exercises

After successful completion of training, participants will be appearing for the Level II exam.

Participants will be certified as NDT LPT Level II after successfully clearing the exam.

Check NDT Level 1 and Level 2 Fee Structure, by clicking here.


A training institute that is profusely providing industry oriented technical education with live hands-on practical’s sessions. Indian and International professionals prefer certification training program in Non-Destructive Testing at Advanced Institute of Nondestructive Testing & Training (ANDT), to create a bright future in Oil and Gas, Petroleum, Aircraft, Refinery, Airspace-ship and other mechanical industries, by availing the NDT Level II certification courses at ANDT either Online or Offline in branch offices ANDT Greater Noida, ANDT Mumbai and ANDT Hyderabad, India.

Aspiring participants get 100% Placement in India & Abroad after successful completion of the NDT Level II Training program.

Liquid Penetrant Testing Syllabus is as per ASNT SNT TC 1A-2016 which trains participants so that they gain sound practical & theoretical knowledge to work under the supervision of NDT LPT Level III experts. It is required to have good health, positive mindset & technical skills to perform calibration and inspection as per written instruction under the supervision of NDT LPT Level III.

Eligibility for Liquid Penetrant Testing NDT Training Level I, II Certification Courses

Eligibility, qualification, and experience requirements as per the written recommended practice of SNT-TC-1A, 2016 Edition are given below.

Non-destructive testing courses are considered as the most valuable professional courses to improve individuals’ skill sets and ladder for the steep career growth in quality control QA/QC functions in manufacturing and processing industries. These courses are especially considered as short term professional courses for any Mechanical, Metallurgical, Civil, Electrical, and other engineering professionals. Based on proficiency requirements, certification is offered for NDT level I, level II, and NDT level III. In order to be eligible for each NDT level, the individual should meet the required eligibility criteria.

Candidates interested in certification of non-destructive testing should have sufficient education, training, and experience to ensure eligibility in required NDT methods in which they are being considered. Candidates with diploma in Engineering or bachelor’s degree in Engineering (Mechanical engineering, Metallurgy, Civil or any engineering) or bachelor’s degree in math, science, or plus 2 / intermediate with math, science are eligible for the courses. Depending on the NDT level chosen, the method selected, candidates with other educational qualifications also are eligible provided if they can meet the following recommended criteria.

In addition, the candidate must meet the following other eligibility as per the written practice.

  •    Near-vision acuity
  •    Color contrast differentiation

Codes and Standards used in Industry, by clicking here.

ANDT- Centre of Excellence in Inspection, Equipment, and Training

ANDT has 1000+ satisfied professionals and Clients in manufacturing, processing, in-service NDT inspection of nuclear, aerospace NDT, automobile components, castings, forgings, Welds, fabrication of structures, oil & gas exploration companies, petroleum refineries, shipbuilding, cross country pipeline constructions, NDT TRAINING INSTITUTES for NDT Techniques in India and abroad. 'ANDT' is in top NDT Institutes in India for NDT Courses in Delhi NCR, NDT Courses in Greater Noida, NDT Courses in Mumbai, NDT Courses in Hyderabad, NDT Courses in Bengaluru, NDT Course in India and is recognized globally for its quality integrity services with technology-driven resources.

Our Certified Engineers & Imminent Clients are from-

In INDIA:- Maharashtra: Nagpur, Nashik, Thane, Washim, Pune, Ahmednagar, Solapur, Amravathi, Mumbai, Aurangabad, Kolhapur, Navi Mumbai, Dhule, Chandrapur, etc. Gujarat: Morbi, Porbandar, Surat, Godhra, Veraval, Gandhidham, Ahmedabad, Anand, Jamnagar, Vadodara, Navsari, Rajkot, Bhavnagar, Nadiad, Botad, Bharuch, Ankleshwar, etc. Madhya Pradesh: Singrauli, Morena, Burhanpur, Ratlam, Bhind, Sagar, Guna, Dewas, Satna, Jabalpur, Bhopal, Indore, Gwalior, Rewa, Shivpuri, Ujjain, Khandwa, Vidisha, Murwara, Chhindwara, etc. Andhra Pradesh: Guntur, Nellore, Chittoor, Rajahmundry, Anantapur, Kurnool, Khammam, Ongole, Proddatur, Adoni, Kadapa, Mahbubnagar, Tirupati, Karimnagar, Ramagundam, Warangal, Hyderabad, Madanapalle, Eluru, Vijayawada, Telangana, Visakhapatnam, etc. Uttarakhand: Bageshwar, Tehri-Garhwal, Roorkee, Kashipur, Udhamsinghnagar, Rishikesh, Nainital, Rudrapur, Dehradun, Pithoragarh, Rudraprayag, Champawat, Chamoli, Haridwar, Uttarkashi, Almora, Garhwal, etc. Tamil Nadu: Coimbatore, Chennai, Madurai, Tiruchirappalli, Tiruppur Uttar Pradesh: Kanpur, Lucknow, Ghaziabad, Allahabad, Bareilly, Aligarh, Gorakhpur, Varanasi, Moradabad, Rampur, Faizabad, etc.Punjab and Chandigarh: Amritsar, Jalandhar, Patiala, Haryana, Ludhiana Odisha: Bhubaneshwar, Cuttack, Madurai, Sundargarh Karnataka: Bengaluru Rajasthan: Jaipur and Some Other Cities/States:: Sikkim, Assam, Tripura, Daman and Diu, Jharkhand, Ranchi, Jammu and Kashmir, Srinagar Delhi, New Delhi, West Bengal, Kolkata, Darjeeling, New Jalpaiguri, Kerala, Kochi, Goa, etc.

In ABROAD- Venezuela, Saudi Arabia, Canada, Iran, Iraq, Kuwait, Russia, United Arab Emirates, Libya, Nigeria, United States, Kazakhstan, Qatar, China, Brazil, Algeria, Mexico, Angola, Ecuador, Azerbaijan, etc.

Nearly A decade of Excellence in Delivering Quality to the Customers.

ANDT was established by a team of eminent mechanical engineering experts with more than ten years of professional industrial experience with prominent industries of the power sector, pressure vessels, precision, and heavy engineering sectors, pipe systems, storage tanks, process plants, castings, forgings, fabrication, sugar, and cement industries, aerospace component manufacturing, material testing laboratories, consulting and NDT inspection companies.


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