Production Control
Andhra Pradesh
Simple Pressure Vessels
SPVD Production Control in Andhra Pradesh: Managing Changes Between Batches of Simple Pressure Vessels
By First Welding Certification Technical Editorial Team
6 Min Read Time
09 Nov 2026
Table of Contents
Railway Manufacturing Preparation
Material Traceability
Welding Qualification
Inspection & Testing
Batch Production
Introduction
Andhra Pradesh has a varied manufacturing and production industry within various sectors, including engineering, fabrication, industrial equipment, and metalworking. There are many opportunities to manufacture a variety of industrial equipment, including simple pressure vessels, with manufacturing taking place in locations such as Visakhapatnam, Vijayawada, Guntur, Tirupati and Sri City. Simple pressure vessels are used for storing pressurised compressed air or nitrogen. They will require suitable materials, weld control, and inspection. If the simple pressure vessels are for sale within the European market then the Simple Pressure Vessels Directive (SPVD) 2014/29/EU must be considered.
Maintaining consistency between batches is an important consideration when manufacturing simple pressure vessels. Within manufacturing you may have multiple instances of the same vessel model being manufactured. This can cause variations to the final product due to variations in materials, welding processes, production equipment, and personnel.
Manufacturers will need to have a suitable system in place to review and control changes made during production. This ensures that all batches meet the correct requirements for design, production, and conformity.
This blog outlines how manufacturers in Andhra Pradesh can control changes during production of simple pressure vessels and ensure consistency is achieved with conformity.
Batch Production of Simple Pressure Vessels
When producing simple pressure vessels in batch production you will manufacture a set amount of pressure vessels using an established design with specific materials and production process. You will often have multiple batches of the same vessel. For example, in Andhra Pradesh you may manufacture a range of simple pressure vessels all with the same nominal capacity and operating specifications for different customers. Although the design of your simple pressure vessels will be similar, there can be variations between batches. These variations should be reviewed.
Manufacturers should have detailed production requirements. This includes;
- Dimensions & Design of vessel
- Material grade & specification
- Plate thickness & identification
- Welding processes & associated qualification
- Production & assembly
- Inspections & pressure tests
- Product identification
This ensures that you manufacture according to an approved specification.
Under the SPVD 2014/29/EU, you will need to ensure that you are meeting the requirements based on the characteristics of the vessel and the correct conformity assessment. The product must meet the requirements of the Directive and applicable technical requirements.
Material Variations Between Batches
Materials are an important consideration when manufacturing simple pressure vessels. If your materials are sourced from a different supplier, different grade, thickness, or condition this can affect the production process and conformity of your product.
For example, you may source steel plates from an approved supplier for your first batch of production. For your second batch you may receive materials from a different supplier. Even though the material looks similar you should ensure that it meets the required specifications.
Before using new materials you should review;
- Material certifications & relevant inspection documents
- Material grade & mechanical properties
- Plate thickness & dimensions
- Heat number / Batch number
- Material condition & defects
- Material compatibility with approved design & production specification
Throughout production you should ensure that you have material identification. When cutting the steel plates down into smaller components you should ensure that the materials have the correct identification transferred using a suitable traceability system.
This is especially important if you have multiple batches being manufactured at the same time. If you don’t have correct identification in place it can become difficult to link the finished vessel to the materials used. By keeping records of the materials received, manufactured, and final inspection you can improve control when manufacturing in Andhra Pradesh. This can also help to prove conformity.
Welding & Production Variation
Welding is an important part of manufacturing welded simple pressure vessels. If there are changes to the welding processes, materials, equipment, or personnel this can impact the quality of the welds. You shouldn’t assume that if you had a successful welding process in a previous batch that it will be suitable for future batches. You should ensure that your welding processes are still appropriate.
You should ensure that you have control over;
- Welding processes – Ensure that you are welding according to your approved qualified welding processes. If there are variations that will impact your qualified welding processes then you should review if additional qualification is required.
- Welding personnel – Ensure that welders and operators have the correct qualification for the welding processes being carried out.
- Welding materials – Ensure that you have control over the type of material being used, storage, handling, and identification.
- Welding equipment – Ensure that the equipment is maintained and checked to ensure it can achieve the correct welding parameters.
- Welding inspection – Ensure that the welds are being inspected according to the product specification.
You should keep records of your welding processes. This should include;
- Welding processes
- Welding personnel
- Relevant production information
If there are any changes then you should review them before applying them. This means that you won’t have any uncontrolled changes impacting the quality of your pressure vessel.
Inspection, Pressure Testing & Batch Records
Inspection and testing will provide evidence that your simple pressure vessels have met the requirements. This should be planned and documented. When moving between batches you should ensure that you still have the correct inspection and testing in place.
This can include;
- Visual inspection of welds
- Checking dimensions against approved drawings
- Checking material identification
- Reviewing production & welding records
- Carrying out required NDT
- Pressure testing according to technical requirements
- Final verification & identification
Pressure testing is very important as it provides evidence regarding the pressure containing capabilities of your vessel. Ensure that you carry out the correct pressure testing according to the requirements and approved technical documentation. Ensure that you have inspection reports and pressure testing records. This should clearly identify the relevant vessel or batch.
A useful batch record could include;
- Production order number
- Vessel identification
- Materials used
- Welding information
- Inspection results
- Pressure test results
- Final verification
If there are any defects or non-conformities then you should record these. You should identify what corrective actions are required and verify the products.
Production Records & SPVD Conformity
Having production records will help link your design requirements to your production. This will help show that you have reviewed and controlled changes between batches. If you are supplying simple pressure vessels to the European market then you will need to have technical documentation and conformity assessment records in line with the SPVD requirements.
You should have a system in place to help ensure that you have;
- Approved design drawings & technical specifications
- Material specifications & certificates
- Welding processes & personnel qualifications
- Production & inspection records
- Pressure testing records
- Non-conformities & corrective actions
- Product identification & traceability
- Applicable conformity assessment documents
If there are any changes to your production then the relevant personnel should review if this will have an impact on the approved design, technical documentation, production, or conformity assessment. If there are changes to the dimensions, material specification, or production method of your vessel then you should perform a technical review. Don’t assume that you already have an assessment in place for all changes.
Ensure that you follow the correct conformity assessment process. This may involve a notified body. Ensure that you meet all the requirements for the Declaration of Conformity and CE marking. Having a good system in place will help you prove that you have consistency between batches and will help with conformity assessment.
Frequently Asked Questions
What is SPVD 2014/29/EU?
SPVD 2014/29/EU is the European Simple Pressure Vessels Directive. This sets out the requirements for simple pressure vessels supplied within the European Union. This includes design, production, and conformity assessment requirements.
Why is batch production control important?
Batch production control will help manufacturers maintain consistency when there are changes to materials, welding, production equipment, or inspection. This also helps with traceability, inspection, and verification.
Do I need to review welding changes?
Yes. You should review any changes that will impact the validity or application of your qualified welding processes. Ensuring that your welding is meeting the technical requirements.
What documentation do I need for SPVD conformity assessment?
Depending on your product you may need;
- Design drawings
- Material records
- Welding qualifications
- Production records
- Inspection records
- Pressure testing
- Conformity assessment.
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Conclusion
Controlling changes during production between batches is an important consideration for manufacturers in Andhra Pradesh. Any changes to materials, welding processes, production equipment, or inspection should be reviewed. By having a system in place to help identify your batches, trace materials, control welding, inspect, pressure test, and have technical documentation this will help you maintain consistency and prove conformity with the SPVD 2014/29/EU.