Section 48. When liquid or gaseous fuel, electric or atomic energy or any other source of heat is used, the horsepower of a boiler shall be determined by either the manufacturer's factory tag affixed to the boiler or burner denoting horsepower, or calculated by one of the following formulae: the steam output capacity as listed on the manufacturer's tag divided by 34.5, the Btu/Hr Input listed on the manufacturer's tag divided by 41,840 or the Btu/Hr Output listed on the manufacturer's tag divided by 33,475.
If a tag is missing, damaged or unclear, the licensed engineer in charge or on duty at the time shall notify the owner or user of the steam boiler. The owner or user shall obtain a notarized letter, signed by an officer of the manufacturer of the boiler or burner, listing the maximum capacity of the steam boiler in Btu/Hr. Such letter shall be an acceptable basis for calculating the horsepower of that particular steam boiler.
The minimum safety valve relieving capacity shall be determined in accordance with the American Society of Mechanical Engineers Code.
The horse power of a reciprocating steam engine shall be ascertained upon the basis of a mean effective pressure of forty pounds per square inch of piston for a simple engine, fifty pounds for a condensing engine, and seventy pounds for a compound engine, calculated upon the area of the high pressure piston. A variable speed engine shall be rated at its designed mean speed.
A steam turbine engine shall be rated at less than nine horse power when the external diameter of the steam supply pipe does not exceed one and three fourths inches, at fifty horse power when it exceeds one and three fourths inches and does not exceed three and one half inches, and at one hundred and fifty horse power when it exceeds three and one half inches and does not exceed five inches.
Structure Massachusetts General Laws
Part I - Administration of the Government
Title XX - Public Safety and Good Order
Section 3 - Changes in Rules; Hearings; Notices
Section 5 - Enforcement of Statutes and Rules; Entry of Premises in Pursuance of Duties
Section 6 - Annual Inspection; Extension of Time; First Inspection
Section 7 - Boilers Excepted From Inspections
Section 8 - Necessity of Inspection; Issuance, Display and Accessibility of Certificate
Section 9 - Pressure; Safety Appliances
Section 10 - Reports as to Boilers Not Inspected by Insurers
Section 11 - Inspections While Boiler Is Being Operated
Section 12 - Removing, Tampering With or Loading Safety Valve
Section 13 - Persons Authorized to Inspect Boilers
Section 14 - Inspectors of Insurers; Notice of Cessation of Employment
Section 15 - Non-Certificated Inspectors of Insurers
Section 16 - Inspection Certificate Issued by Insurer and Signed by Non-Certificated Inspector
Section 17 - Reports by Inspectors; Recommendations
Section 18 - Reports of Inspections by Insurers
Section 19 - Reports of Cancellation and Refusal of Insurance
Section 20 - Safety Appliances For, and Inspection Of, Heating Boilers
Section 21 - Preparation of Boiler for Inspection; Notice; Forbidding Operation of Boiler
Section 22 - Fees; Payment to Commonwealth
Section 23 - Certificate of Inspection; Prerequisites; Necessity
Section 24 - Numbering, Stamping or Tagging Boiler; Defacement or Removal of Number
Section 27 - Certificate of Inspection; Contents; Display; Accessibility
Section 29 - Notification of Defects
Section 30 - Expiration or Cancellation of Insurance
Section 31 - Hydrostatic Pressure Test
Section 32 - Prevention of Entry on Premises
Section 33 - Violation of Statutes or Rules
Section 34 - Compressed Air Tanks; Necessity of Certificate of Inspections; Exceptions
Section 37 - Notice of Location of Tanks
Section 38 - Reports of Inspections by Insurers
Section 39 - Inspection Tests; Preparation
Section 40 - Fees; Payment to Commonwealth
Section 41 - Violation of Statutes or Regulations
Section 42 - Ammonia Compressor Safety Valves
Section 43 - Rules; Formulation
Section 44 - Rules; Effect; Printing; Furnished on Request
Section 46 - Necessity of Licenses for Engineers and Firemen; Exceptions
Section 46a - Checklist for Steam Boiler Maintenance
Section 47 - Prima Facie Evidence of Violation of Statute
Section 48 - Ascertainment of Horse Power
Section 49 - Classes of Licenses and Work Permitted; License Renewal; Continuing Education
Section 50 - Prerequisites for Examinations
Section 50b - Nuclear Power Plant Operators and Engineers; Licenses Classified
Section 54 - Carrying of License or Temporary Permit
Section 54a - Violation of Sec. 53, 53a, or 54; Penalties
Section 55 - Violation of Statutes or Rules; Prevention of Entry on Premises
Section 57 - Application; Fees, Number of Examinations; Frequency of Applications
Section 58 - Taking Notes at Examinations and on Appeals; Representative of Insurer
Section 59 - Suspension, Revocation, Loss or Destruction of Certificates or Licenses; Fee
Section 63 - Appeals; Rehearing; Fee; Finality of Decision
Section 64 - Engineers and Firemen; Examinations; Appeal
Section 65 - Operators of Hoisting Machinery; Licenses; Application; Examination
Section 67 - Licenses; Duration; Fees; Expiration; Renewal; Revocation
Section 69 - Expenditures by State Fire Marshal for Work and Apparatus
Section 73 - Insurance Company Inspection; Authorization
Section 74 - Safety Appliances; Tampering; Maximum Pressure
Section 75 - Employment of Inspectors by Insurance Companies
Section 76 - Inspector of Boilers; Certificate of Competency Required
Section 77 - Reports and Recommendations of Inspectors; Insurance Cancellation or Refusal Report
Section 79 - Certificate of Inspection; Contents; Display
Section 80 - Violations; Written Notice of Violation; Appeals; Penalties
Section 81 - Definitions Applicable to Secs. 81 to 88
Section 82 - Pipefitting Examining and Licensing Rules; Classification of Pipefitter Licenses
Section 84 - Necessity for License
Section 85 - License Applications; Examinations; Fees; Renewal; Expiration
Section 85a - Apprentice Sprinkler Fitters
Section 86 - Classification and Limitation of Licenses
Section 87 - Pipefitters, Inapplicability of Provisions
Section 88 - Refrigeration Technicians, Inapplicability of Provisions
Section 90 - Fee for the Issuance of Certificate of Inspection