Written Scheme Of Examination Experts

One of the UK’s leading providers of independent pressure system examinations, with over 30 years experience specialising in compliance to the Pressure Systems Safety Regulations 2000 (PSSR).

Covering all of the UK, providing thorough written schemes of examinations via directly employed, high calibre engineer surveyors. Ensuring the compliance of thousands of businesses ranging from sole traders to global blue chip organisations.

Rapid production of detailed pressure system inspection reports via a cloud based system, ensuring your report is available 24/7.

A written scheme of examination is a legal document required for most pressure systems and all steam equipment. All systems that fall under the regulations must have a WSE in place before being operational.

Products & Services

Mandate Systems cover all aspects of pressure system examinations and written scheme creation in accordance with the Pressure Systems Safety Regulations 2000 (PSSR). Our expert engineer surveyors can support air, mixed gas and steam examinations across a full range of products.


We are the chosen partner of choice for thousands of customers across a wide range of industries. From a small sole trader to large organisations we can support your pressure system compliance requirements.


We have a range of training products to upskill service engineers to undertake pressure system examinations, along with providing awareness to pressure system users. Our training courses are IOSH and CPD approved.

For over 30 years Mandate Systems have been specialising in pressure system written schemes of examination, with a team of highly skilled engineer surveyors, we ensure the compliance of thousands of businesses across the UK.

Known also for our impeccable high standards, detailed reports and speedy cloud based reporting system, we examine anything from small mobile compressors to large steam boilers and nuclear plants.

Customers are at the heart of our business and we pride ourselves on a “partnership for life motto”, with repeat custom and exceptional 5 star reviews across the board.

We are proud to be truly independent by only ever supplying written schemes, having an in-house chartered engineer and taking the hassle out of compliance with full account management.

Frequently Asked Questions

Mandate Systems is packed with guidance and advice on Pressure Systems Safety, but we have also provided answers to some frequently asked questions. Please let us know if there is a question you would like the answer to that isn’t listed here.

A WSE is a legal document that is required on most pressure equipment under the Pressure System Safety Regulations 2000 (PSSR). The WSE lists the components within a system, examinable items and the frequency these should be examined. This is all noted in your WSE.

It is a common misconception that new equipment does not require a WSE, however this is incorrect. All equipment that falls under the regulations must have a WSE in place before it is used for the first time, regardless of age.

Any person deemed competent to create a WSE document can do so if they have the relevant experience and knowledge, however the WSE document must be certified by either an Incorporated or Chartered Engineer, depending on the system size (usually this will require Chartered Engineer qualification sign off).

Under the Pressure Systems Safety Regulations you must have a WSE in place prior to the use of the system. This system will include a rigid vessel and a relevant fluid, mainly gas (carbon dioxide, nitrogen, argon, steam among others), with a pressure at 0.5 bar or above excluding steam, which is at any pressure.

The competent person determines the frequency of examination by item, and notes this in your written scheme. It is most common for the items to be examinable every 12 months.

This is a legal requirement under the Pressure Systems Safety Regulations 2000 (PSSR) and is enforced by the Health and Safety Executive (HSE) and Local Authority. If the regulations are not adhered to, unlimited fines or prosecution from HSE are a possibility.

Equipment capable of operating at 250 bar litres or above, or steam at any pressure, will fall under the regulations. To work this out multiply the maximum working pressure X vessel volume – e.g. 10.0 bar x 50 litre = 500 bar litre.

The WSE is the obligation of the owner so hire units should be covered by the owner of the equipment, unless otherwise agreed.

The written scheme should be completed by an independent body so that impartiality can be proven. This can be completed by a service provider as long as they are competent in this field and impartiality can be evidenced. It is paramount to note however, that the person certifying the WSE must also have the relevant qualifications (e.g. Incorporated or Chartered Engineer).